- fix bug in ft2232 pathmove (thanks to Michael Bruck for the patch)
[openocd.git] / src / jtag / ft2232.c
index 9af57dd1b60a797d118a8da8634c772d7fe4055d..1a058675cd3b88f6c9ed8f1e256a2606012c213c 100644 (file)
@@ -73,12 +73,17 @@ int ft2232_handle_device_desc_command(struct command_context_s *cmd_ctx, char *c
 int ft2232_handle_serial_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int ft2232_handle_layout_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int ft2232_handle_vid_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+int ft2232_handle_latency_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 
 char *ft2232_device_desc = NULL;
 char *ft2232_serial = NULL;
 char *ft2232_layout = NULL;
-u16 ft2232_vid = 0x0403;
-u16 ft2232_pid = 0x6010;
+unsigned char ft2232_latency = 2;
+
+#define MAX_USB_IDS    8
+/* vid = pid = 0 marks the end of the list */
+static u16 ft2232_vid[MAX_USB_IDS+1] = { 0x0403, 0 };
+static u16 ft2232_pid[MAX_USB_IDS+1] = { 0x6010, 0 };
 
 typedef struct ft2232_layout_s
 {
@@ -92,26 +97,37 @@ typedef struct ft2232_layout_s
 int usbjtag_init(void);
 int jtagkey_init(void);
 int olimex_jtag_init(void);
-int m5960_init(void);
+int flyswatter_init(void);
+int turtle_init(void);
+int comstick_init(void);
+int stm32stick_init(void);
 
 /* reset procedures for supported layouts */
 void usbjtag_reset(int trst, int srst);
 void jtagkey_reset(int trst, int srst);
 void olimex_jtag_reset(int trst, int srst);
-void m5960_reset(int trst, int srst);
+void flyswatter_reset(int trst, int srst);
+void turtle_reset(int trst, int srst);
+void comstick_reset(int trst, int srst);
+void stm32stick_reset(int trst, int srst);
 
 /* blink procedures for layouts that support a blinking led */
 void olimex_jtag_blink(void);
+void turtle_jtag_blink(void);
 
 ft2232_layout_t ft2232_layouts[] =
 {
        {"usbjtag", usbjtag_init, usbjtag_reset, NULL},
        {"jtagkey", jtagkey_init, jtagkey_reset, NULL},
        {"jtagkey_prototype_v1", jtagkey_init, jtagkey_reset, NULL},
+       {"oocdlink", jtagkey_init, jtagkey_reset, NULL},
        {"signalyzer", usbjtag_init, usbjtag_reset, NULL},
        {"evb_lm3s811", usbjtag_init, usbjtag_reset, NULL},
        {"olimex-jtag", olimex_jtag_init, olimex_jtag_reset, olimex_jtag_blink},
-       {"m5960", m5960_init, m5960_reset, NULL},
+       {"flyswatter", flyswatter_init, flyswatter_reset, NULL},
+       {"turtelizer2", turtle_init, turtle_reset, turtle_jtag_blink},
+       {"comstick", comstick_init, comstick_reset, NULL},
+       {"stm32stick", stm32stick_init, stm32stick_reset, NULL},
        {NULL, NULL, NULL},
 };
 
@@ -144,8 +160,6 @@ jtag_interface_t ft2232_interface =
        
        .execute_queue = ft2232_execute_queue,
        
-       .support_pathmove = 1,
-       
        .speed = ft2232_speed,
        .register_commands = ft2232_register_commands,
        .init = ft2232_init,
@@ -160,7 +174,7 @@ int ft2232_write(u8 *buf, int size, u32* bytes_written)
        if ((status = FT_Write(ftdih, buf, size, &dw_bytes_written)) != FT_OK)
        {
                *bytes_written = dw_bytes_written;
-               ERROR("FT_Write returned: %i", status);
+               ERROR("FT_Write returned: %lu", status);
                return ERROR_JTAG_DEVICE_ERROR;
        }
        else
@@ -194,10 +208,11 @@ int ft2232_read(u8* buf, int size, u32* bytes_read)
 
        while ((*bytes_read < size) && timeout--)
        {
-               if ((status = FT_Read(ftdih, buf, size, &dw_bytes_read)) != FT_OK)
+               if ((status = FT_Read(ftdih, buf + *bytes_read, size - 
+                       *bytes_read, &dw_bytes_read)) != FT_OK)         
                {
                        *bytes_read = 0; 
-                       ERROR("FT_Read returned: %i", status);
+                       ERROR("FT_Read returned: %lu", status);
                        return ERROR_JTAG_DEVICE_ERROR;
                }
                *bytes_read += dw_bytes_read; 
@@ -235,7 +250,7 @@ int ft2232_speed(int speed)
        u32 bytes_written;
 
        buf[0] = 0x86; /* command "set divisor" */
-       buf[1] = speed & 0xff; /* valueL (0=6MHz, 1=3MHz, 2=1.5MHz, ...*/
+       buf[1] = speed & 0xff; /* valueL (0=6MHz, 1=3MHz, 2=2.0MHz, ...*/
        buf[2] = (speed >> 8) & 0xff; /* valueH */
        
        DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
@@ -244,6 +259,8 @@ int ft2232_speed(int speed)
                ERROR("couldn't set FT2232 TCK speed");
                return retval;
        }
+
+       jtag_speed = speed;
        
        return ERROR_OK;
 }
@@ -258,10 +275,12 @@ int ft2232_register_commands(struct command_context_s *cmd_ctx)
                COMMAND_CONFIG, NULL);
        register_command(cmd_ctx, NULL, "ft2232_vid_pid", ft2232_handle_vid_pid_command,
                                         COMMAND_CONFIG, NULL);
+       register_command(cmd_ctx, NULL, "ft2232_latency", ft2232_handle_latency_command,
+                                        COMMAND_CONFIG, NULL);
        return ERROR_OK;
 }
 
-void ft2232_end_state(state)
+void ft2232_end_state(enum tap_state state)
 {
        if (tap_move_map[state] != -1)
                end_state = state;
@@ -394,7 +413,12 @@ int ft2232_send_and_recv(jtag_command_t *first, jtag_command_t *last)
 
        ft2232_expect_read = 0;
        ft2232_read_pointer = 0;
-
+       
+       /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
+        * that wasn't handled by a caller-provided error handler
+        */ 
+       retval = ERROR_OK;
+       
        cmd = first;
        while (cmd != last)
        {
@@ -407,7 +431,8 @@ int ft2232_send_and_recv(jtag_command_t *first, jtag_command_t *last)
                                        scan_size = jtag_scan_size(cmd->cmd.scan);
                                        buffer = calloc(CEIL(scan_size, 8), 1);
                                        ft2232_read_scan(type, buffer, scan_size);
-                                       jtag_read_buffer(buffer, cmd->cmd.scan);
+                                       if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
+                                               retval = ERROR_JTAG_QUEUE_FAILED;
                                        free(buffer);
                                }
                                break;
@@ -419,7 +444,7 @@ int ft2232_send_and_recv(jtag_command_t *first, jtag_command_t *last)
        
        ft2232_buffer_size = 0;
 
-       return ERROR_OK;
+       return retval;
 }
 
 void ft2232_add_pathmove(pathmove_command_t *cmd)
@@ -434,12 +459,14 @@ void ft2232_add_pathmove(pathmove_command_t *cmd)
                tms_byte = 0x0;
                int bit_count = 0;
                
+               int num_states_batch = num_states > 7 ? 7 : num_states;
+
                /* command "Clock Data to TMS/CS Pin (no Read)" */
                BUFFER_ADD = 0x4b;
                /* number of states remaining */
-               BUFFER_ADD = (num_states % 7) - 1;
+               BUFFER_ADD = num_states_batch - 1;
                
-               while (num_states % 7)
+               while (num_states_batch--)
                {
                        if (tap_transitions[cur_state].low == cmd->path[state_count])
                                buf_set_u32(&tms_byte, bit_count++, 1, 0x0);
@@ -469,7 +496,7 @@ void ft2232_add_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size
        int cur_byte = 0;
        int last_bit;
 
-       if ((!ir_scan && (cur_state != TAP_SD)) || (ir_scan && (cur_state != TAP_SI)))
+       if (!((!ir_scan && (cur_state == TAP_SD)) || (ir_scan && (cur_state == TAP_SI))))
        {
                /* command "Clock Data to TMS/CS Pin (no Read)" */
                BUFFER_ADD = 0x4b;
@@ -490,8 +517,9 @@ void ft2232_add_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size
        }
        
        /* add command for complete bytes */
-       if (num_bytes > 1)
+       while (num_bytes > 1)
        {
+               int thisrun_bytes;
                if (type == SCAN_IO)
                {
                        /* Clock Data Bytes In and Out LSB First */
@@ -510,24 +538,206 @@ void ft2232_add_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size
                        BUFFER_ADD = 0x28;
                        //DEBUG("added TDI bytes (i %i)", num_bytes);
                }
-               BUFFER_ADD = (num_bytes-2) & 0xff;
-               BUFFER_ADD = ((num_bytes-2) >> 8) & 0xff;
+               thisrun_bytes = (num_bytes > 65537) ? 65536 : (num_bytes - 1);
+               num_bytes -= thisrun_bytes;
+               BUFFER_ADD = (thisrun_bytes - 1) & 0xff;
+               BUFFER_ADD = ((thisrun_bytes - 1) >> 8) & 0xff;
+               if (type != SCAN_IN)
+               {
+                       /* add complete bytes */
+                       while(thisrun_bytes-- > 0)
+                       {
+                               BUFFER_ADD = buffer[cur_byte];
+                               cur_byte++;
+                               bits_left -= 8;
+                       }
+               }
+               else /* (type == SCAN_IN) */
+               {
+                       bits_left -= 8 * (thisrun_bytes);
+               }
        }
+       
+       /* the most signifcant bit is scanned during TAP movement */
        if (type != SCAN_IN)
+               last_bit = (buffer[cur_byte] >> (bits_left - 1)) & 0x1;
+       else
+               last_bit = 0;
+
+       /* process remaining bits but the last one */
+       if (bits_left > 1)
        {
-               /* add complete bytes */
-               while(num_bytes-- > 1)
+               if (type == SCAN_IO)
                {
+                       /* Clock Data Bits In and Out LSB First */
+                       BUFFER_ADD = 0x3b;
+                       //DEBUG("added TDI bits (io) %i", bits_left - 1);
+               }
+               else if (type == SCAN_OUT)
+               {
+                       /* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
+                       BUFFER_ADD = 0x1b;
+                       //DEBUG("added TDI bits (o)");
+               }
+               else if (type == SCAN_IN)
+               {
+                       /* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
+                       BUFFER_ADD = 0x2a;
+                       //DEBUG("added TDI bits (i %i)", bits_left - 1);
+               }
+               BUFFER_ADD = bits_left - 2;
+               if (type != SCAN_IN)
                        BUFFER_ADD = buffer[cur_byte];
-                       cur_byte++;
-                       bits_left -= 8;
+       }
+
+       if ((ir_scan && (end_state == TAP_SI)) ||
+               (!ir_scan && (end_state == TAP_SD)))
+       {
+               if (type == SCAN_IO)
+               {
+                       /* Clock Data Bits In and Out LSB First */
+                       BUFFER_ADD = 0x3b;
+                       //DEBUG("added TDI bits (io) %i", bits_left - 1);
                }
+               else if (type == SCAN_OUT)
+               {
+                       /* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
+                       BUFFER_ADD = 0x1b;
+                       //DEBUG("added TDI bits (o)");
+               }
+               else if (type == SCAN_IN)
+               {
+                       /* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
+                       BUFFER_ADD = 0x2a;
+                       //DEBUG("added TDI bits (i %i)", bits_left - 1);
+               }
+               BUFFER_ADD = 0x0;
+               BUFFER_ADD = last_bit;
        }
-       if (type == SCAN_IN)
+       else
        {
-               bits_left -= 8 * (num_bytes - 1);
+               /* move from Shift-IR/DR to end state */
+               if (type != SCAN_OUT)
+               {
+                       /* Clock Data to TMS/CS Pin with Read */
+                       BUFFER_ADD = 0x6b;
+                       //DEBUG("added TMS scan (read)");
+               }
+               else
+               {
+                       /* Clock Data to TMS/CS Pin (no Read) */
+                       BUFFER_ADD = 0x4b;
+                       //DEBUG("added TMS scan (no read)");
+               }
+               BUFFER_ADD = 0x6;
+               BUFFER_ADD = TAP_MOVE(cur_state, end_state) | (last_bit << 7);
+               cur_state = end_state;
+       }
+}
+
+int ft2232_large_scan(scan_command_t *cmd, enum scan_type type, u8 *buffer, int scan_size)
+{
+       int num_bytes = (scan_size + 7) / 8;
+       int bits_left = scan_size;
+       int cur_byte = 0;
+       int last_bit;
+       u8 *receive_buffer = malloc(CEIL(scan_size, 8));
+       u8 *receive_pointer = receive_buffer;
+       u32 bytes_written;
+       u32 bytes_read;
+       int retval;
+       int thisrun_read = 0;
+       
+       if (cmd->ir_scan)
+       {
+               ERROR("BUG: large IR scans are not supported");
+               exit(-1);
        }
 
+       if (cur_state != TAP_SD)
+       {
+               /* command "Clock Data to TMS/CS Pin (no Read)" */
+               BUFFER_ADD = 0x4b;
+               /* scan 7 bit */
+               BUFFER_ADD = 0x6;
+               /* TMS data bits */
+               BUFFER_ADD = TAP_MOVE(cur_state, TAP_SD);
+               cur_state = TAP_SD;
+       }
+       
+       if ((retval = ft2232_write(ft2232_buffer, ft2232_buffer_size, &bytes_written)) != ERROR_OK)
+       {
+               ERROR("couldn't write MPSSE commands to FT2232");
+               exit(-1);
+       }
+       DEBUG("ft2232_buffer_size: %i, bytes_written: %i", ft2232_buffer_size, bytes_written);
+       ft2232_buffer_size = 0;
+       
+       /* add command for complete bytes */
+       while (num_bytes > 1)
+       {
+               int thisrun_bytes;
+               
+               if (type == SCAN_IO)
+               {
+                       /* Clock Data Bytes In and Out LSB First */
+                       BUFFER_ADD = 0x39;
+                       //DEBUG("added TDI bytes (io %i)", num_bytes);
+               }
+               else if (type == SCAN_OUT)
+               {
+                       /* Clock Data Bytes Out on -ve Clock Edge LSB First (no Read) */
+                       BUFFER_ADD = 0x19;
+                       //DEBUG("added TDI bytes (o)");
+               }
+               else if (type == SCAN_IN)
+               {
+                       /* Clock Data Bytes In on +ve Clock Edge LSB First (no Write) */
+                       BUFFER_ADD = 0x28;
+                       //DEBUG("added TDI bytes (i %i)", num_bytes);
+               }
+               thisrun_bytes = (num_bytes > 65537) ? 65536 : (num_bytes - 1);
+               thisrun_read = thisrun_bytes;
+               num_bytes -= thisrun_bytes;
+               BUFFER_ADD = (thisrun_bytes - 1) & 0xff;
+               BUFFER_ADD = ((thisrun_bytes - 1) >> 8) & 0xff;
+               if (type != SCAN_IN)
+               {
+                       /* add complete bytes */
+                       while(thisrun_bytes-- > 0)
+                       {
+                               BUFFER_ADD = buffer[cur_byte];
+                               cur_byte++;
+                               bits_left -= 8;
+                       }
+               }
+               else /* (type == SCAN_IN) */
+               {
+                       bits_left -= 8 * (thisrun_bytes);
+               }
+
+               if ((retval = ft2232_write(ft2232_buffer, ft2232_buffer_size, &bytes_written)) != ERROR_OK)
+               {
+                       ERROR("couldn't write MPSSE commands to FT2232");
+                       exit(-1);
+               }
+               DEBUG("ft2232_buffer_size: %i, bytes_written: %i", ft2232_buffer_size, bytes_written);
+               ft2232_buffer_size = 0;
+               
+               if (type != SCAN_OUT)
+               {
+                       if ((retval = ft2232_read(receive_pointer, thisrun_read, &bytes_read)) != ERROR_OK)
+                       {
+                               ERROR("couldn't read from FT2232");
+                               exit(-1);
+                       }
+                       DEBUG("thisrun_read: %i, bytes_read: %i", thisrun_read, bytes_read);
+                       receive_pointer += bytes_read;
+               }
+       }
+       
+       thisrun_read = 0;
+       
        /* the most signifcant bit is scanned during TAP movement */
        if (type != SCAN_IN)
                last_bit = (buffer[cur_byte] >> (bits_left - 1)) & 0x1;
@@ -558,30 +768,83 @@ void ft2232_add_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size
                BUFFER_ADD = bits_left - 2;
                if (type != SCAN_IN)
                        BUFFER_ADD = buffer[cur_byte];
+                       
+               if (type != SCAN_OUT)
+                       thisrun_read += 2;
        }
 
-       /* move from Shift-IR/DR to end state */
-       if (type != SCAN_OUT)
+       if (end_state == TAP_SD)
        {
-               /* Clock Data to TMS/CS Pin with Read */
-               BUFFER_ADD = 0x6b;
-               //DEBUG("added TMS scan (read)");
+               if (type == SCAN_IO)
+               {
+                       /* Clock Data Bits In and Out LSB First */
+                       BUFFER_ADD = 0x3b;
+                       //DEBUG("added TDI bits (io) %i", bits_left - 1);
+               }
+               else if (type == SCAN_OUT)
+               {
+                       /* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
+                       BUFFER_ADD = 0x1b;
+                       //DEBUG("added TDI bits (o)");
+               }
+               else if (type == SCAN_IN)
+               {
+                       /* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
+                       BUFFER_ADD = 0x2a;
+                       //DEBUG("added TDI bits (i %i)", bits_left - 1);
+               }
+               BUFFER_ADD = 0x0;
+               BUFFER_ADD = last_bit;
        }
        else
        {
-               /* Clock Data to TMS/CS Pin (no Read) */
-               BUFFER_ADD = 0x4b;
-               //DEBUG("added TMS scan (no read)");
+               /* move from Shift-IR/DR to end state */
+               if (type != SCAN_OUT)
+               {
+                       /* Clock Data to TMS/CS Pin with Read */
+                       BUFFER_ADD = 0x6b;
+                       //DEBUG("added TMS scan (read)");
+               }
+               else
+               {
+                       /* Clock Data to TMS/CS Pin (no Read) */
+                       BUFFER_ADD = 0x4b;
+                       //DEBUG("added TMS scan (no read)");
+               }
+               BUFFER_ADD = 0x6;
+               BUFFER_ADD = TAP_MOVE(cur_state, end_state) | (last_bit << 7);
+               cur_state = end_state;
        }
-       BUFFER_ADD = 0x6;
-       BUFFER_ADD = TAP_MOVE(cur_state, end_state) | (last_bit << 7);
-       cur_state = end_state;
-
+       
+       if (type != SCAN_OUT)
+               thisrun_read += 1;
+       
+       if ((retval = ft2232_write(ft2232_buffer, ft2232_buffer_size, &bytes_written)) != ERROR_OK)
+       {
+               ERROR("couldn't write MPSSE commands to FT2232");
+               exit(-1);
+       }
+       DEBUG("ft2232_buffer_size: %i, bytes_written: %i", ft2232_buffer_size, bytes_written);
+       ft2232_buffer_size = 0;
+       
+       if (type != SCAN_OUT)
+       {
+               if ((retval = ft2232_read(receive_pointer, thisrun_read, &bytes_read)) != ERROR_OK)
+               {
+                       ERROR("couldn't read from FT2232");
+                       exit(-1);
+               }
+               DEBUG("thisrun_read: %i, bytes_read: %i", thisrun_read, bytes_read);
+               receive_pointer += bytes_read;
+       }
+       
+       return ERROR_OK;
 }
 
 int ft2232_predict_scan_out(int scan_size, enum scan_type type)
 {
        int predicted_size = 3;
+       int num_bytes = (scan_size - 1) / 8;
        
        if (cur_state != TAP_SD)
                predicted_size += 3;
@@ -589,14 +852,14 @@ int ft2232_predict_scan_out(int scan_size, enum scan_type type)
        if (type == SCAN_IN)    /* only from device to host */
        {
                /* complete bytes */
-               predicted_size += (CEIL(scan_size, 8) > 1) ? 3 : 0;
+               predicted_size += (CEIL(num_bytes, 65536)) * 3;
                /* remaining bits - 1 (up to 7) */
                predicted_size += ((scan_size - 1) % 8) ? 2 : 0;
        }
        else                                    /* host to device, or bidirectional */
        {
                /* complete bytes */
-               predicted_size += (CEIL(scan_size, 8) > 1) ? (CEIL(scan_size, 8) + 3 - 1) : 0;
+               predicted_size += num_bytes + (CEIL(num_bytes, 65536)) * 3;
                /* remaining bits -1 (up to 7) */
                predicted_size += ((scan_size - 1) % 8) ? 3 : 0;
        }
@@ -737,7 +1000,7 @@ void olimex_jtag_reset(int trst, int srst)
     DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x", trst, srst, high_output, high_direction);
 }
 
-void m5960_reset(int trst, int srst)
+void flyswatter_reset(int trst, int srst)
 {
        if (trst == 1)
        {
@@ -762,7 +1025,88 @@ void m5960_reset(int trst, int srst)
     BUFFER_ADD = 0x80;
     BUFFER_ADD = low_output;
     BUFFER_ADD = low_direction;
-    DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x", trst, srst, high_output, high_direction);
+    DEBUG("trst: %i, srst: %i, low_output: 0x%2.2x, low_direction: 0x%2.2x", trst, srst, low_output, low_direction);
+}
+
+void turtle_reset(int trst, int srst)
+{
+       trst = trst;
+       
+       if (srst == 1)
+       {
+               low_output |= nSRST;
+       }
+       else if (srst == 0)
+       {
+               low_output &= ~nSRST;
+       }
+       
+       /* command "set data bits low byte" */
+       BUFFER_ADD = 0x80;
+       BUFFER_ADD = low_output;
+       BUFFER_ADD = low_direction;
+       DEBUG("srst: %i, low_output: 0x%2.2x, low_direction: 0x%2.2x", srst, low_output, low_direction);
+}
+
+void comstick_reset(int trst, int srst)
+{
+       if (trst == 1)
+       {
+               cur_state = TAP_TLR;
+               high_output &= ~nTRST;
+       }
+       else if (trst == 0)
+       {
+               high_output |= nTRST;
+       }
+
+    if (srst == 1)
+    {
+        high_output &= ~nSRST;
+    }
+    else if (srst == 0)
+    {
+        high_output |= nSRST;
+    }
+       
+       /* command "set data bits high byte" */
+       BUFFER_ADD = 0x82;
+       BUFFER_ADD = high_output;
+       BUFFER_ADD = high_direction;
+       DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x", trst, srst, high_output, high_direction);
+}
+
+void stm32stick_reset(int trst, int srst)
+{
+       if (trst == 1)
+       {
+               cur_state = TAP_TLR;
+               high_output &= ~nTRST;
+       }
+       else if (trst == 0)
+       {
+               high_output |= nTRST;
+       }
+
+    if (srst == 1)
+    {
+        low_output &= ~nSRST;
+    }
+    else if (srst == 0)
+    {
+        low_output |= nSRST;
+    }
+       
+       /* command "set data bits low byte" */
+       BUFFER_ADD = 0x80;
+       BUFFER_ADD = low_output;
+       BUFFER_ADD = low_direction;
+       
+       /* command "set data bits high byte" */
+       BUFFER_ADD = 0x82;
+       BUFFER_ADD = high_output;
+       BUFFER_ADD = high_direction;
+       DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x", trst, srst, high_output, high_direction);
 }
 
 int ft2232_execute_queue()
@@ -775,6 +1119,12 @@ int ft2232_execute_queue()
        int i;
        int predicted_size = 0;
        int require_send = 0;
+       int retval;
+       
+       /* return ERROR_OK, unless ft2232_send_and_recv reports a failed check
+        * that wasn't handled by a caller-provided error handler
+        */ 
+       retval = ERROR_OK;
 
        ft2232_buffer_size = 0;
        ft2232_expect_read = 0;
@@ -796,7 +1146,8 @@ int ft2232_execute_queue()
                                predicted_size = 3;
                                if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE)
                                {
-                                       ft2232_send_and_recv(first_unsent, cmd);
+                                       if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                                               retval = ERROR_JTAG_QUEUE_FAILED;
                                        require_send = 0;
                                        first_unsent = cmd;
                                }
@@ -820,7 +1171,8 @@ int ft2232_execute_queue()
                                        predicted_size += 3;
                                if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE)
                                {
-                                       ft2232_send_and_recv(first_unsent, cmd);
+                                       if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                                               retval = ERROR_JTAG_QUEUE_FAILED;
                                        require_send = 0;
                                        first_unsent = cmd;
                                }
@@ -871,7 +1223,8 @@ int ft2232_execute_queue()
                                predicted_size = 3;
                                if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE)
                                {
-                                       ft2232_send_and_recv(first_unsent, cmd);
+                                       if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                                               retval = ERROR_JTAG_QUEUE_FAILED;
                                        require_send = 0;
                                        first_unsent = cmd;
                                }
@@ -895,7 +1248,8 @@ int ft2232_execute_queue()
                                predicted_size = 3 * CEIL(cmd->cmd.pathmove->num_states, 7);
                                if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE)
                                {
-                                       ft2232_send_and_recv(first_unsent, cmd);
+                                       if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                                               retval = ERROR_JTAG_QUEUE_FAILED;
                                        require_send = 0;
                                        first_unsent = cmd;
                                }
@@ -909,10 +1263,29 @@ int ft2232_execute_queue()
                                scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
                                type = jtag_scan_type(cmd->cmd.scan);
                                predicted_size = ft2232_predict_scan_out(scan_size, type);
-                               if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE)
+                               if ((predicted_size + 1) > FT2232_BUFFER_SIZE)
+                               {
+                                       DEBUG("oversized ft2232 scan (predicted_size > FT2232_BUFFER_SIZE)");
+                                       /* unsent commands before this */
+                                       if (first_unsent != cmd)
+                                               if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                                                       retval = ERROR_JTAG_QUEUE_FAILED;
+                                       
+                                       /* current command */
+                                       if (cmd->cmd.scan->end_state != -1)
+                                               ft2232_end_state(cmd->cmd.scan->end_state);
+                                       ft2232_large_scan(cmd->cmd.scan, type, buffer, scan_size);
+                                       require_send = 0;
+                                       first_unsent = cmd->next;
+                                       if (buffer)
+                                               free(buffer);
+                                       break;
+                               }
+                               else if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE)
                                {
-                                       DEBUG("ftd2xx buffer size reached, sending queued commands (first_unsent: %x, cmd: %x)", first_unsent, cmd);
-                                       ft2232_send_and_recv(first_unsent, cmd);
+                                       DEBUG("ft2232 buffer size reached, sending queued commands (first_unsent: %p, cmd: %p)", first_unsent, cmd);
+                                       if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                                               retval = ERROR_JTAG_QUEUE_FAILED;
                                        require_send = 0;
                                        first_unsent = cmd;
                                }
@@ -929,7 +1302,8 @@ int ft2232_execute_queue()
 #endif
                                break;
                        case JTAG_SLEEP:
-                               ft2232_send_and_recv(first_unsent, cmd);
+                               if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                                       retval = ERROR_JTAG_QUEUE_FAILED;
                                first_unsent = cmd->next;
                                jtag_sleep(cmd->cmd.sleep->us);
 #ifdef _DEBUG_JTAG_IO_                         
@@ -944,60 +1318,29 @@ int ft2232_execute_queue()
        }
 
        if (require_send > 0)
-               ft2232_send_and_recv(first_unsent, cmd);
+               if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+                       retval = ERROR_JTAG_QUEUE_FAILED;
 
-       return ERROR_OK;
+       return retval;
 }
 
-int ft2232_init(void)
-{
-       u8 latency_timer;
-       u8 buf[1];
-       int retval;
-       u32 bytes_written;
-       
 #if BUILD_FT2232_FTD2XX == 1
+static int ft2232_init_ftd2xx(u16 vid, u16 pid, int more, int *try_more)
+{
        FT_STATUS status;
        DWORD openex_flags = 0;
        char *openex_string = NULL;
-#endif
-
-       ft2232_layout_t *cur_layout = ft2232_layouts;
-       
-       if ((ft2232_layout == NULL) || (ft2232_layout[0] == 0))
-       {
-               ft2232_layout = "usbjtag";
-               WARNING("No ft2232 layout specified, using default 'usbjtag'");
-       }
-       
-       while (cur_layout->name)
-       {
-               if (strcmp(cur_layout->name, ft2232_layout) == 0)
-               {
-                       layout = cur_layout;
-                       break;
-               }
-               cur_layout++;
-       }
+       u8 latency_timer;
 
-       if (!layout)
-       {
-               ERROR("No matching layout found for %s", ft2232_layout);
-               return ERROR_JTAG_INIT_FAILED;
-       }
-       
-#if BUILD_FT2232_FTD2XX == 1
-       DEBUG("'ft2232' interface using FTD2XX with '%s' layout", ft2232_layout);
-#elif BUILD_FT2232_LIBFTDI == 1
-       DEBUG("'ft2232' interface using libftdi with '%s' layout", ft2232_layout);
-#endif
+       DEBUG("'ft2232' interface using FTD2XX with '%s' layout (%4.4x:%4.4x)",
+           ft2232_layout, vid, pid);
 
-#if BUILD_FT2232_FTD2XX == 1
 #if IS_WIN32 == 0
        /* Add non-standard Vid/Pid to the linux driver */
-       if ((status = FT_SetVIDPID(ft2232_vid, ft2232_pid)) != FT_OK)
+       if ((status = FT_SetVIDPID(vid, pid)) != FT_OK)
        {
-               WARNING("couldn't add %4.4x:%4.4x", ft2232_vid, ft2232_pid);
+               WARNING("couldn't add %4.4x:%4.4x",
+                   vid, pid);
        }
 #endif
 
@@ -1029,7 +1372,13 @@ int ft2232_init(void)
        {
                DWORD num_devices;
                
-               ERROR("unable to open ftdi device: %i", status);
+               if (more) {
+                       WARNING("unable to open ftdi device (trying more): %lu",
+                           status);
+                       *try_more = 1;
+                       return ERROR_JTAG_INIT_FAILED;
+               }
+               ERROR("unable to open ftdi device: %lu", status);
                status = FT_ListDevices(&num_devices, NULL, FT_LIST_NUMBER_ONLY);
                if (status == FT_OK)
                {
@@ -1044,7 +1393,7 @@ int ft2232_init(void)
 
                        if (status == FT_OK)
                        {
-                               ERROR("ListDevices: %d\n", num_devices);
+                               ERROR("ListDevices: %lu\n", num_devices);
                                for (i = 0; i < num_devices; i++)
                                        ERROR("%i: %s", i, desc_array[i]);
                        }
@@ -1055,20 +1404,20 @@ int ft2232_init(void)
                }
                else
                {
-                       printf("ListDevices: NONE\n");
+                       ERROR("ListDevices: NONE\n");
                }
                return ERROR_JTAG_INIT_FAILED;
        }
 
-       if ((status = FT_SetLatencyTimer(ftdih, 2)) != FT_OK)
+       if ((status = FT_SetLatencyTimer(ftdih, ft2232_latency)) != FT_OK)
        {
-               ERROR("unable to set latency timer: %i", status);
+               ERROR("unable to set latency timer: %lu", status);
                return ERROR_JTAG_INIT_FAILED;
        }
        
        if ((status = FT_GetLatencyTimer(ftdih, &latency_timer)) != FT_OK)
        {
-               ERROR("unable to get latency timer: %i", status);
+               ERROR("unable to get latency timer: %lu", status);
                return ERROR_JTAG_INIT_FAILED;
        }
        else
@@ -1078,23 +1427,59 @@ int ft2232_init(void)
        
        if ((status = FT_SetTimeouts(ftdih, 5000, 5000)) != FT_OK)
        {
-               ERROR("unable to set timeouts: %i", status);
+               ERROR("unable to set timeouts: %lu", status);
                return ERROR_JTAG_INIT_FAILED;
        }
 
        if ((status = FT_SetBitMode(ftdih, 0x0b, 2)) != FT_OK)
        {
-               ERROR("unable to enable bit i/o mode: %i", status);
+               ERROR("unable to enable bit i/o mode: %lu", status);
                return ERROR_JTAG_INIT_FAILED;
        }
-#elif BUILD_FT2232_LIBFTDI == 1
+
+       return ERROR_OK;
+}
+
+static int ft2232_purge_ftd2xx(void)
+{
+       FT_STATUS status;
+
+       if ((status = FT_Purge(ftdih, FT_PURGE_RX | FT_PURGE_TX)) != FT_OK)
+       {
+               ERROR("error purging ftd2xx device: %lu", status);
+               return ERROR_JTAG_INIT_FAILED;
+       }
+
+       return ERROR_OK;
+}
+#endif /* BUILD_FT2232_FTD2XX == 1 */
+
+#if BUILD_FT2232_LIBFTDI == 1
+static int ft2232_init_libftdi(u16 vid, u16 pid, int more, int *try_more)
+{
+       u8 latency_timer;
+
+       DEBUG("'ft2232' interface using libftdi with '%s' layout (%4.4x:%4.4x)",
+           ft2232_layout, vid, pid);
+
        if (ftdi_init(&ftdic) < 0)
                return ERROR_JTAG_INIT_FAILED;
 
        /* context, vendor id, product id */
-       if (ftdi_usb_open(&ftdic, ft2232_vid, ft2232_pid) < 0)
+       if (ftdi_usb_open_desc(&ftdic, vid, pid, ft2232_device_desc,
+           ft2232_serial) < 0) {
+               if (more)
+                       WARNING("unable to open ftdi device (trying more): %s",
+                            ftdic.error_str);
+               else
+                       ERROR("unable to open ftdi device: %s", ftdic.error_str);
+               *try_more = 1;
+               return ERROR_JTAG_INIT_FAILED;
+       }
+
+       if (ftdi_set_interface(&ftdic, INTERFACE_A) < 0)
        {
-               ERROR("unable to open ftdi device: %s", ftdic.error_str);
+               ERROR("unable to select FT2232 channel A: %s", ftdic.error_str);
                return ERROR_JTAG_INIT_FAILED;
        }
 
@@ -1104,7 +1489,7 @@ int ft2232_init(void)
                return ERROR_JTAG_INIT_FAILED;
        }
 
-       if (ftdi_set_latency_timer(&ftdic, 2) < 0)
+       if (ftdi_set_latency_timer(&ftdic, ft2232_latency) < 0)
        {
                ERROR("unable to set latency timer");
                return ERROR_JTAG_INIT_FAILED;
@@ -1120,12 +1505,78 @@ int ft2232_init(void)
                DEBUG("current latency timer: %i", latency_timer);
        }
 
-       ftdic.bitbang_mode = 0; /* Reset controller */
-       ftdi_enable_bitbang(&ftdic, 0x0b); /* ctx, JTAG I/O mask */
+       ftdi_set_bitmode(&ftdic, 0x0b, 2); /* ctx, JTAG I/O mask */
+
+       return ERROR_OK;
+}
+
+static int ft2232_purge_libftdi(void)
+{
+       if (ftdi_usb_purge_buffers(&ftdic) < 0)
+       {
+               ERROR("ftdi_purge_buffers: %s", ftdic.error_str);
+               return ERROR_JTAG_INIT_FAILED;
+       }
+
+       return ERROR_OK;
+}
+#endif /* BUILD_FT2232_LIBFTDI == 1 */
+
+int ft2232_init(void)
+{
+       u8 buf[1];
+       int retval;
+       u32 bytes_written;
+       ft2232_layout_t *cur_layout = ft2232_layouts;
+       int i;
+       
+       if ((ft2232_layout == NULL) || (ft2232_layout[0] == 0))
+       {
+               ft2232_layout = "usbjtag";
+               WARNING("No ft2232 layout specified, using default 'usbjtag'");
+       }
+       
+       while (cur_layout->name)
+       {
+               if (strcmp(cur_layout->name, ft2232_layout) == 0)
+               {
+                       layout = cur_layout;
+                       break;
+               }
+               cur_layout++;
+       }
+
+       if (!layout)
+       {
+               ERROR("No matching layout found for %s", ft2232_layout);
+               return ERROR_JTAG_INIT_FAILED;
+       }
+       
+       for (i = 0; 1; i++) {
+               /*
+                * "more indicates that there are more IDs to try, so we should
+                * not print an error for an ID mismatch (but for anything
+                * else, we should).
+                *
+                * try_more indicates that the error code returned indicates an
+                * ID mismatch (and nothing else) and that we should proceeed
+                * with the next ID pair.
+                */
+               int more = ft2232_vid[i+1] || ft2232_pid[i+1];
+               int try_more = 0;
 
-       ftdic.bitbang_mode = 2; /* MPSSE mode */
-       ftdi_enable_bitbang(&ftdic, 0x0b); /* ctx, JTAG I/O mask */
+#if BUILD_FT2232_FTD2XX == 1
+               retval = ft2232_init_ftd2xx(ft2232_vid[i], ft2232_pid[i],
+                   more, &try_more);
+#elif BUILD_FT2232_LIBFTDI == 1
+               retval = ft2232_init_libftdi(ft2232_vid[i], ft2232_pid[i],
+                   more, &try_more);
 #endif 
+               if (retval >= 0)
+                       break;
+               if (!more || !try_more)
+                       return retval;
+       }
 
        ft2232_buffer_size = 0;
        ft2232_buffer = malloc(FT2232_BUFFER_SIZE);
@@ -1143,17 +1594,9 @@ int ft2232_init(void)
        }
 
 #if BUILD_FT2232_FTD2XX == 1
-       if ((status = FT_Purge(ftdih, FT_PURGE_RX | FT_PURGE_TX)) != FT_OK)
-       {
-               ERROR("error purging ftd2xx device: %i", status);
-               return ERROR_JTAG_INIT_FAILED;
-       }
+       return ft2232_purge_ftd2xx();
 #elif BUILD_FT2232_LIBFTDI == 1
-       if (ftdi_usb_purge_buffers(&ftdic) < 0)
-       {
-               ERROR("ftdi_purge_buffers: %s", ftdic.error_str);
-               return ERROR_JTAG_INIT_FAILED;
-       }
+       return ft2232_purge_libftdi();
 #endif 
 
        return ERROR_OK;
@@ -1260,7 +1703,8 @@ int jtagkey_init(void)
                nSRST = 0x02;
                nSRSTnOE = 0x08;
        }
-       else if (strcmp(layout->name, "jtagkey_prototype_v1") == 0)
+       else if ((strcmp(layout->name, "jtagkey_prototype_v1") == 0) ||
+               (strcmp(layout->name, "oocdlink") == 0))
        {
                nTRST = 0x02;
                nTRSTnOE = 0x1;
@@ -1379,7 +1823,7 @@ int olimex_jtag_init(void)
        return ERROR_OK;
 }
 
-int m5960_init(void)
+int flyswatter_init(void)
 {
        u8 buf[3];
        u32 bytes_written;
@@ -1395,7 +1839,7 @@ int m5960_init(void)
        
        if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
        {
-               ERROR("couldn't initialize FT2232 with 'm5960' layout"); 
+               ERROR("couldn't initialize FT2232 with 'flyswatter' layout"); 
                return ERROR_JTAG_INIT_FAILED;
        }
        
@@ -1418,7 +1862,133 @@ int m5960_init(void)
        
        if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
        {
-               ERROR("couldn't initialize FT2232 with 'm5960' layout"); 
+               ERROR("couldn't initialize FT2232 with 'flyswatter' layout"); 
+               return ERROR_JTAG_INIT_FAILED;
+       }
+       
+       return ERROR_OK;
+}
+
+int turtle_init(void)
+{
+       u8 buf[3];
+       u32 bytes_written;
+       
+       low_output = 0x08;
+       low_direction = 0x5b;
+       
+       /* initialize low byte for jtag */
+       buf[0] = 0x80; /* command "set data bits low byte" */
+       buf[1] = low_output; /* value (TMS=1,TCK=0, TDI=0, nOE=0) */
+       buf[2] = low_direction; /* dir (output=1), TCK/TDI/TMS=out, TDO=in, nOE=out */
+       DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
+       
+       if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
+       {
+               ERROR("couldn't initialize FT2232 with 'turtelizer2' layout"); 
+               return ERROR_JTAG_INIT_FAILED;
+       }
+       
+       nSRST = 0x40;
+       
+       high_output = 0x00;
+       high_direction = 0x0C;
+       
+       /* initialize high port */
+       buf[0] = 0x82; /* command "set data bits high byte" */
+       buf[1] = high_output;
+       buf[2] = high_direction;
+       DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
+       
+       if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
+       {
+               ERROR("couldn't initialize FT2232 with 'turtelizer2' layout"); 
+               return ERROR_JTAG_INIT_FAILED;
+       }
+       
+       return ERROR_OK;
+}
+
+int comstick_init(void)
+{
+       u8 buf[3];
+       u32 bytes_written;
+       
+       low_output = 0x08;
+       low_direction = 0x0b;
+       
+       /* initialize low byte for jtag */
+       buf[0] = 0x80; /* command "set data bits low byte" */
+       buf[1] = low_output; /* value (TMS=1,TCK=0, TDI=0, nOE=0) */
+       buf[2] = low_direction; /* dir (output=1), TCK/TDI/TMS=out, TDO=in, nOE=out */
+       DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
+       
+       if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
+       {
+               ERROR("couldn't initialize FT2232 with 'comstick' layout"); 
+               return ERROR_JTAG_INIT_FAILED;
+       }
+       
+       nTRST = 0x01;
+       nTRSTnOE = 0x00; /* no output enable for nTRST */
+       nSRST = 0x02;
+       nSRSTnOE = 0x00; /* no output enable for nSRST */
+       
+       high_output = 0x03;
+       high_direction = 0x03;
+       
+       /* initialize high port */
+       buf[0] = 0x82; /* command "set data bits high byte" */
+       buf[1] = high_output;
+       buf[2] = high_direction;
+       DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
+       
+       if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
+       {
+               ERROR("couldn't initialize FT2232 with 'comstick' layout"); 
+               return ERROR_JTAG_INIT_FAILED;
+       }
+       
+       return ERROR_OK;
+}
+
+int stm32stick_init(void)
+{
+       u8 buf[3];
+       u32 bytes_written;
+       
+       low_output = 0x88;
+       low_direction = 0x8b;
+       
+       /* initialize low byte for jtag */
+       buf[0] = 0x80; /* command "set data bits low byte" */
+       buf[1] = low_output; /* value (TMS=1,TCK=0, TDI=0, nOE=0) */
+       buf[2] = low_direction; /* dir (output=1), TCK/TDI/TMS=out, TDO=in, nOE=out */
+       DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
+       
+       if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
+       {
+               ERROR("couldn't initialize FT2232 with 'stm32stick' layout"); 
+               return ERROR_JTAG_INIT_FAILED;
+       }
+               
+       nTRST = 0x01;
+       nTRSTnOE = 0x00; /* no output enable for nTRST */
+       nSRST = 0x80;
+       nSRSTnOE = 0x00; /* no output enable for nSRST */
+       
+       high_output = 0x01;
+       high_direction = 0x03;
+       
+       /* initialize high port */
+       buf[0] = 0x82; /* command "set data bits high byte" */
+       buf[1] = high_output;
+       buf[2] = high_direction;
+       DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
+       
+       if (((ft2232_write(buf, 3, &bytes_written)) != ERROR_OK) || (bytes_written != 3))
+       {
+               ERROR("couldn't initialize FT2232 with 'stm32stick' layout"); 
                return ERROR_JTAG_INIT_FAILED;
        }
        
@@ -1446,6 +2016,26 @@ void olimex_jtag_blink(void)
        BUFFER_ADD = high_direction;
 }
 
+void turtle_jtag_blink(void)
+{
+       /* 
+   * Turtelizer2 has two LEDs connected to ACBUS2 and ACBUS3
+        */
+       if (high_output & 0x08)
+       {
+               high_output = 0x04;
+       }
+       else
+       {
+               high_output = 0x08;
+       }
+       
+       BUFFER_ADD = 0x82;
+       BUFFER_ADD = high_output;
+       BUFFER_ADD = high_direction;
+}
+
+
 int ft2232_quit(void)
 {
 #if BUILD_FT2232_FTD2XX == 1
@@ -1461,6 +2051,7 @@ int ft2232_quit(void)
 #endif
 
        free(ft2232_buffer);
+       ft2232_buffer = NULL;
 
        return ERROR_OK;
 }
@@ -1506,15 +2097,45 @@ int ft2232_handle_layout_command(struct command_context_s *cmd_ctx, char *cmd, c
 
 int ft2232_handle_vid_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       if (argc >= 2)
+       int i;
+
+       if (argc > MAX_USB_IDS*2) {
+               WARNING("ignoring extra IDs in ft2232_vid_pid "
+                   "(maximum is %d pairs)", MAX_USB_IDS);
+               argc = MAX_USB_IDS*2;
+       }
+       if (argc < 2 || (argc & 1))
+       {
+               WARNING("incomplete ft2232_vid_pid configuration directive");
+               if (argc < 2)
+                       return ERROR_OK;
+       }
+
+       for (i = 0; i+1 < argc; i += 2) {
+               ft2232_vid[i >> 1] = strtol(args[i], NULL, 0);
+               ft2232_pid[i >> 1] = strtol(args[i+1], NULL, 0);
+       }
+       /*
+        * Explicitly terminate, in case there are multiples instances of
+        * ft2232_vid_pid.
+        */
+       ft2232_vid[i >> 1] = ft2232_pid[i >> 1] = 0;
+
+       return ERROR_OK;
+}
+
+int ft2232_handle_latency_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+       if (argc == 1)
        {
-               ft2232_vid = strtol(args[0], NULL, 0);
-               ft2232_pid = strtol(args[1], NULL, 0);
+               ft2232_latency = atoi(args[0]);
        }
        else
        {
-               WARNING("incomplete ft2232_vid_pid configuration directive");
+               ERROR("expected exactly one argument to ft2232_latency <ms>");
        }
        
        return ERROR_OK;
 }
+
+

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