1 /***************************************************************************
2 * Copyright (C) 2011 by Martin Schmoelzer *
3 * <martin.schmoelzer@student.tuwien.ac.at> *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
22 * @file Defines USB descriptors, interrupt routines and helper functions.
23 * To minimize code size, we make the following assumptions:
24 * - The OpenULINK has exactly one configuration
25 * - and exactly one alternate setting
27 * Therefore, we do not have to support the Set Configuration USB request.
34 /* Also update external declarations in "include/usb.h" if making changes to
36 volatile bool EP2_out
= 0;
37 volatile bool EP2_in
= 0;
39 volatile __xdata __at
0x7FE8 struct setup_data setup_data
;
41 /* Define number of endpoints (except Control Endpoint 0) in a central place.
42 * Be sure to include the neccessary endpoint descriptors! */
43 #define NUM_ENDPOINTS 2
46 * Normally, we would initialize the descriptor structures in C99 style:
48 * __code usb_device_descriptor_t device_descriptor = {
50 * .bDescriptorType = bar,
55 * But SDCC currently does not support this, so we have to do it the
56 * old-fashioned way...
59 __code
struct usb_device_descriptor device_descriptor
= {
60 /* .bLength = */ sizeof(struct usb_device_descriptor
),
61 /* .bDescriptorType = */ DESCRIPTOR_TYPE_DEVICE
,
62 /* .bcdUSB = */ 0x0110, /* BCD: 01.00 (Version 1.0 USB spec) */
63 /* .bDeviceClass = */ 0xFF, /* 0xFF = vendor-specific */
64 /* .bDeviceSubClass = */ 0xFF,
65 /* .bDeviceProtocol = */ 0xFF,
66 /* .bMaxPacketSize0 = */ 64,
67 /* .idVendor = */ 0xC251,
68 /* .idProduct = */ 0x2710,
69 /* .bcdDevice = */ 0x0100,
70 /* .iManufacturer = */ 1,
72 /* .iSerialNumber = */ 3,
73 /* .bNumConfigurations = */ 1
76 /* WARNING: ALL config, interface and endpoint descriptors MUST be adjacent! */
78 __code
struct usb_config_descriptor config_descriptor
= {
79 /* .bLength = */ sizeof(struct usb_config_descriptor
),
80 /* .bDescriptorType = */ DESCRIPTOR_TYPE_CONFIGURATION
,
81 /* .wTotalLength = */ sizeof(struct usb_config_descriptor
) +
82 sizeof(struct usb_interface_descriptor
) +
84 sizeof(struct usb_endpoint_descriptor
)),
85 /* .bNumInterfaces = */ 1,
86 /* .bConfigurationValue = */ 1,
87 /* .iConfiguration = */ 4, /* String describing this configuration */
88 /* .bmAttributes = */ 0x80, /* Only MSB set according to USB spec */
89 /* .MaxPower = */ 50 /* 100 mA */
92 __code
struct usb_interface_descriptor interface_descriptor00
= {
93 /* .bLength = */ sizeof(struct usb_interface_descriptor
),
94 /* .bDescriptorType = */ DESCRIPTOR_TYPE_INTERFACE
,
95 /* .bInterfaceNumber = */ 0,
96 /* .bAlternateSetting = */ 0,
97 /* .bNumEndpoints = */ NUM_ENDPOINTS
,
98 /* .bInterfaceClass = */ 0xFF,
99 /* .bInterfaceSubclass = */ 0xFF,
100 /* .bInterfaceProtocol = */ 0xFF,
101 /* .iInterface = */ 0
104 __code
struct usb_endpoint_descriptor Bulk_EP2_IN_Endpoint_Descriptor
= {
105 /* .bLength = */ sizeof(struct usb_endpoint_descriptor
),
106 /* .bDescriptorType = */ 0x05,
107 /* .bEndpointAddress = */ 2 | USB_DIR_IN
,
108 /* .bmAttributes = */ 0x02,
109 /* .wMaxPacketSize = */ 64,
113 __code
struct usb_endpoint_descriptor Bulk_EP2_OUT_Endpoint_Descriptor
= {
114 /* .bLength = */ sizeof(struct usb_endpoint_descriptor
),
115 /* .bDescriptorType = */ 0x05,
116 /* .bEndpointAddress = */ 2 | USB_DIR_OUT
,
117 /* .bmAttributes = */ 0x02,
118 /* .wMaxPacketSize = */ 64,
122 __code
struct usb_language_descriptor language_descriptor
= {
124 /* .bDescriptorType = */ DESCRIPTOR_TYPE_STRING
,
125 /* .wLANGID = */ {0x0409 /* US English */}
128 __code
struct usb_string_descriptor strManufacturer
=
129 STR_DESCR(9,'O','p','e','n','U','L','I','N','K');
131 __code
struct usb_string_descriptor strProduct
=
132 STR_DESCR(9,'O','p','e','n','U','L','I','N','K');
134 __code
struct usb_string_descriptor strSerialNumber
=
135 STR_DESCR(6, '0','0','0','0','0','1');
137 __code
struct usb_string_descriptor strConfigDescr
=
138 STR_DESCR(12, 'J','T','A','G',' ','A','d','a','p','t','e','r');
140 /* Table containing pointers to string descriptors */
141 __code
struct usb_string_descriptor
* __code en_string_descriptors
[4] = {
148 void sudav_isr(void) __interrupt SUDAV_ISR
152 usb_handle_setup_data();
158 void sof_isr(void) __interrupt SOF_ISR
{ }
159 void sutok_isr(void) __interrupt SUTOK_ISR
{ }
160 void suspend_isr(void) __interrupt SUSPEND_ISR
{ }
161 void usbreset_isr(void) __interrupt USBRESET_ISR
{ }
162 void ibn_isr(void) __interrupt IBN_ISR
{ }
164 void ep0in_isr(void) __interrupt EP0IN_ISR
{ }
165 void ep0out_isr(void) __interrupt EP0OUT_ISR
{ }
166 void ep1in_isr(void) __interrupt EP1IN_ISR
{ }
167 void ep1out_isr(void) __interrupt EP1OUT_ISR
{ }
170 * EP2 IN: called after the transfer from uC->Host has finished: we sent data
172 void ep2in_isr(void) __interrupt EP2IN_ISR
{
176 IN07IRQ
= IN2IR
; // Clear OUT2 IRQ
180 * EP2 OUT: called after the transfer from Host->uC has finished: we got data
182 void ep2out_isr(void) __interrupt EP2OUT_ISR
{
186 OUT07IRQ
= OUT2IR
; // Clear OUT2 IRQ
189 void ep3in_isr(void) __interrupt EP3IN_ISR
{ }
190 void ep3out_isr(void) __interrupt EP3OUT_ISR
{ }
191 void ep4in_isr(void) __interrupt EP4IN_ISR
{ }
192 void ep4out_isr(void) __interrupt EP4OUT_ISR
{ }
193 void ep5in_isr(void) __interrupt EP5IN_ISR
{ }
194 void ep5out_isr(void) __interrupt EP5OUT_ISR
{ }
195 void ep6in_isr(void) __interrupt EP6IN_ISR
{ }
196 void ep6out_isr(void) __interrupt EP6OUT_ISR
{ }
197 void ep7in_isr(void) __interrupt EP7IN_ISR
{ }
198 void ep7out_isr(void) __interrupt EP7OUT_ISR
{ }
201 * Return the control/status register for an endpoint
203 * @param ep endpoint address
204 * @return on success: pointer to Control & Status register for endpoint
206 * @return on failure: NULL
208 __xdata
uint8_t* usb_get_endpoint_cs_reg(uint8_t ep
)
210 /* Mask direction bit */
211 uint8_t ep_num
= ep
& 0x7F;
218 return ep
& 0x80 ? &IN1CS
: &OUT1CS
;
221 return ep
& 0x80 ? &IN2CS
: &OUT2CS
;
224 return ep
& 0x80 ? &IN3CS
: &OUT3CS
;
227 return ep
& 0x80 ? &IN4CS
: &OUT4CS
;
230 return ep
& 0x80 ? &IN5CS
: &OUT5CS
;
233 return ep
& 0x80 ? &IN6CS
: &OUT6CS
;
236 return ep
& 0x80 ? &IN7CS
: &OUT7CS
;
243 void usb_reset_data_toggle(uint8_t ep
)
246 +----+-----+-----+------+-----+-------+-------+-------+
247 | Q | S | R | IO | 0 | EP2 | EP1 | EP0 |
248 +----+-----+-----+------+-----+-------+-------+-------+
250 To reset data toggle bits, we have to write the endpoint direction (IN/OUT)
251 to the IO bit and the endpoint number to the EP2..EP0 bits. Then, in a
252 separate write cycle, the R bit needs to be set.
254 uint8_t togctl_value
= (ep
& 0x80 >> 3) | (ep
& 0x7);
256 /* First step: Write EP number and direction bit */
257 TOGCTL
= togctl_value
;
259 /* Second step: Set R bit */
260 togctl_value
|= TOG_R
;
261 TOGCTL
= togctl_value
;
265 * Handle GET_STATUS request.
267 * @return on success: true
268 * @return on failure: false
270 bool usb_handle_get_status(void)
274 switch (setup_data
.bmRequestType
) {
276 /* Two byte response: Byte 0, Bit 0 = self-powered, Bit 1 = remote wakeup.
277 * Byte 1: reserved, reset to zero */
285 /* Always return two zero bytes according to USB 1.1 spec, p. 191 */
293 /* Get stall bit for endpoint specified in low byte of wIndex */
294 ep_cs
= usb_get_endpoint_cs_reg(setup_data
.wIndex
& 0xff);
296 if (*ep_cs
& EPSTALL
) {
303 /* Second byte sent has to be always zero */
318 * Handle CLEAR_FEATURE request.
320 * @return on success: true
321 * @return on failure: false
323 bool usb_handle_clear_feature(void)
325 __xdata
uint8_t *ep_cs
;
327 switch (setup_data
.bmRequestType
) {
329 /* Clear remote wakeup not supported: stall EP0 */
333 if (setup_data
.wValue
== 0) {
334 /* Unstall the endpoint specified in wIndex */
335 ep_cs
= usb_get_endpoint_cs_reg(setup_data
.wIndex
);
342 /* Unsupported feature, stall EP0 */
347 /* Vendor commands... */
354 * Handle SET_FEATURE request.
356 * @return on success: true
357 * @return on failure: false
359 bool usb_handle_set_feature(void)
361 __xdata
uint8_t *ep_cs
;
363 switch (setup_data
.bmRequestType
) {
365 if (setup_data
.wValue
== 2) {
370 if (setup_data
.wValue
== 0) {
371 /* Stall the endpoint specified in wIndex */
372 ep_cs
= usb_get_endpoint_cs_reg(setup_data
.wIndex
);
379 /* Unsupported endpoint feature */
384 /* Vendor commands... */
392 * Handle GET_DESCRIPTOR request.
394 * @return on success: true
395 * @return on failure: false
397 bool usb_handle_get_descriptor(void)
399 __xdata
uint8_t descriptor_type
;
400 __xdata
uint8_t descriptor_index
;
402 descriptor_type
= (setup_data
.wValue
& 0xff00) >> 8;
403 descriptor_index
= setup_data
.wValue
& 0x00ff;
405 switch (descriptor_type
) {
406 case DESCRIPTOR_TYPE_DEVICE
:
407 SUDPTRH
= HI8(&device_descriptor
);
408 SUDPTRL
= LO8(&device_descriptor
);
410 case DESCRIPTOR_TYPE_CONFIGURATION
:
411 SUDPTRH
= HI8(&config_descriptor
);
412 SUDPTRL
= LO8(&config_descriptor
);
414 case DESCRIPTOR_TYPE_STRING
:
415 if (setup_data
.wIndex
== 0) {
416 /* Supply language descriptor */
417 SUDPTRH
= HI8(&language_descriptor
);
418 SUDPTRL
= LO8(&language_descriptor
);
420 else if (setup_data
.wIndex
== 0x0409 /* US English */) {
421 /* Supply string descriptor */
422 SUDPTRH
= HI8(en_string_descriptors
[descriptor_index
- 1]);
423 SUDPTRL
= LO8(en_string_descriptors
[descriptor_index
- 1]);
430 /* Unsupported descriptor type */
439 * Handle SET_INTERFACE request.
441 void usb_handle_set_interface(void)
443 /* Reset Data Toggle */
444 usb_reset_data_toggle(USB_DIR_IN
| 2);
445 usb_reset_data_toggle(USB_DIR_OUT
| 2);
447 /* Unstall & clear busy flag of all valid IN endpoints */
450 /* Unstall all valid OUT endpoints, reset bytecounts */
456 * Handle the arrival of a USB Control Setup Packet.
458 void usb_handle_setup_data(void)
460 switch (setup_data
.bRequest
) {
462 if (!usb_handle_get_status()) {
467 if (!usb_handle_clear_feature()) {
472 /* Reserved values */
476 if (!usb_handle_set_feature()) {
481 /* Handled by USB core */
484 /* Set Descriptor not supported. */
488 if (!usb_handle_get_descriptor()) {
492 case GET_CONFIGURATION
:
493 /* OpenULINK has only one configuration, return its index */
494 IN0BUF
[0] = config_descriptor
.bConfigurationValue
;
497 case SET_CONFIGURATION
:
498 /* OpenULINK has only one configuration -> nothing to do */
501 /* OpenULINK only has one interface, return its number */
502 IN0BUF
[0] = interface_descriptor00
.bInterfaceNumber
;
506 usb_handle_set_interface();
509 /* Isochronous endpoints not used -> nothing to do */
512 /* Any other requests: do nothing */
518 * USB initialization. Configures USB interrupts, endpoints and performs
521 void usb_init(void) {
522 /* Mark endpoint 2 IN & OUT as valid */
526 /* Make sure no isochronous endpoints are marked valid */
530 /* Disable isochronous endpoints. This makes the isochronous data buffers
531 * available as 8051 XDATA memory at address 0x2000 - 0x27FF */
534 /* Enable USB Autovectoring */
537 /* Enable SUDAV interrupt */
540 /* Enable EP2 OUT & IN interrupts */
544 /* Enable USB interrupt (EIE register) */
547 /* Perform ReNumeration */
548 USBCS
= DISCON
| RENUM
;
550 USBCS
= DISCOE
| RENUM
;
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