From: Austin Morton Date: Wed, 29 Mar 2017 03:22:44 +0000 (-0400) Subject: stlink: increase trace buffer size to maximum allowed on st-link v2 firmware X-Git-Tag: v0.11.0-rc1~1432 X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=commitdiff_plain;h=568e84236bf3b58f4eef73cbed70f3544b44df1f;hp=f605a23bc4b2620b493bd07241cd5928b74e197f stlink: increase trace buffer size to maximum allowed on st-link v2 firmware Increasing the trace buffer size on the st-link itself gives openocd a greater chance of avoiding trace data overflowing within the st-link between polls when there is a large amount of data being sent over the trace port The st-link appears to split the given buffer size in half while one half is awaiting transfer over USB, the other half is being filled by DMA transfer. If you do not poll frequently enough, the DMA transfer will overflow back to the start of its current buffer, resulting in corrupted output Buffer size of 4096 bytes is the maximum allowed by the st-link v2 Change-Id: I169189b021c34f8d18de1601d78b8c5890367d68 Signed-off-by: Austin Morton Reviewed-on: http://openocd.zylin.com/4085 Tested-by: jenkins Reviewed-by: Tomas Vanek Reviewed-by: Freddie Chopin --- diff --git a/src/jtag/drivers/stlink_usb.c b/src/jtag/drivers/stlink_usb.c index 699c41fa36..0bdcd316b7 100644 --- a/src/jtag/drivers/stlink_usb.c +++ b/src/jtag/drivers/stlink_usb.c @@ -216,7 +216,7 @@ struct stlink_usb_handle_s { #define STLINK_DEBUG_APIV2_DRIVE_NRST_HIGH 0x01 #define STLINK_DEBUG_APIV2_DRIVE_NRST_PULSE 0x02 -#define STLINK_TRACE_SIZE 1024 +#define STLINK_TRACE_SIZE 4096 #define STLINK_TRACE_MAX_HZ 2000000 #define STLINK_TRACE_MIN_VERSION 13