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jtag/drivers cmsis-dap: do not limit speed so strictly 

Adapter clock frequency is set by 32-bit number and most adapters
limit the highest speed safely. There is no reason to impose strict
limit of 5000 kHz if some adapters can do more.

While on it give informative error message in case of zero adapter_khz.

Change-Id: I45c9804678e24496ea769ea9ca6036701b04dde9
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/3945
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
This commit is contained in:
Tomas Vanek 2017-01-09 17:06:52 +01:00 committed by Freddie Chopin
parent 73a9464960
commit 44ad4fdcb0
1 changed files with 3 additions and 5 deletions
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8
src/jtag/drivers/cmsis_dap_usb.c
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@ -1499,13 +1499,11 @@ static int cmsis_dap_execute_queue(void)
static int cmsis_dap_speed(int speed)
{
if (speed > DAP_MAX_CLOCK) {
LOG_INFO("reduce speed request: %dkHz to %dkHz maximum", speed, DAP_MAX_CLOCK);
speed = DAP_MAX_CLOCK;
}
if (speed > DAP_MAX_CLOCK)
LOG_INFO("High speed (adapter_khz %d) may be limited by adapter firmware.", speed);
if (speed == 0) {
LOG_INFO("RTCK not supported");
LOG_ERROR("RTCK not supported. Set nonzero adapter_khz.");
return ERROR_JTAG_NOT_IMPLEMENTED;
}