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drivers/ftdi: add support for SWD multidrop 

Ignore ack received after DP_TARGETSEL write to prevent false error.

Inspired by Graham Sanderson's http://review.openocd.org/4935

Change-Id: I04fd77cde3244de250743d8c8bfb93ed26379385
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/6698
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Tomas Vanek 2021-11-12 14:14:32 +01:00 committed by Antonio Borneo
parent 872682345a
commit d569b9bd68
1 changed files with 7 additions and 3 deletions
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10
src/jtag/drivers/ftdi.c
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@ -1121,7 +1121,11 @@ static int ftdi_swd_run_queue(void)
for (size_t i = 0; i < swd_cmd_queue_length; i++) {
int ack = buf_get_u32(swd_cmd_queue[i].trn_ack_data_parity_trn, 1, 3);
LOG_DEBUG_IO("%s %s %s reg %X = %08"PRIx32,
/* Devices do not reply to DP_TARGETSEL write cmd, ignore received ack */
bool check_ack = swd_cmd_returns_ack(swd_cmd_queue[i].cmd);
LOG_DEBUG_IO("%s%s %s %s reg %X = %08"PRIx32,
check_ack ? "" : "ack ignored ",
ack == SWD_ACK_OK ? "OK" : ack == SWD_ACK_WAIT ? "WAIT" : ack == SWD_ACK_FAULT ? "FAULT" : "JUNK",
swd_cmd_queue[i].cmd & SWD_CMD_APNDP ? "AP" : "DP",
swd_cmd_queue[i].cmd & SWD_CMD_RNW ? "read" : "write",
@ -1129,8 +1133,8 @@ static int ftdi_swd_run_queue(void)
buf_get_u32(swd_cmd_queue[i].trn_ack_data_parity_trn,
1 + 3 + (swd_cmd_queue[i].cmd & SWD_CMD_RNW ? 0 : 1), 32));
if (ack != SWD_ACK_OK) {
queued_retval = ack == SWD_ACK_WAIT ? ERROR_WAIT : ERROR_FAIL;
if (ack != SWD_ACK_OK && check_ack) {
queued_retval = swd_ack_to_error_code(ack);
goto skip;
} else if (swd_cmd_queue[i].cmd & SWD_CMD_RNW) {