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stlink: fix computation of trace prescaler

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Use integer rounding for the computation of prescaler.
Improve the test of prescaler range, knowing its value would be
decremented before being written in TPIU ACPR.

Change-Id: I041dde1dca41323904e36a6b6975028a6de902b3
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5909
Tested-by: jenkins
This commit is contained in:
Antonio Borneo
2020-10-31 14:55:10 +01:00
parent 1f6efaada0
commit 475f42051e
1 changed files with 10 additions and 6 deletions
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16
src/jtag/drivers/stlink_usb.c
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@@ -2989,7 +2989,6 @@ static int stlink_config_trace(void *handle, bool enabled,
uint16_t *prescaler)
{
struct stlink_usb_handle_s *h = handle;
uint16_t presc;
if (enabled && (!(h->version.flags & STLINK_F_HAS_TRACE) ||
pin_protocol != TPIU_PIN_PROTOCOL_ASYNC_UART)) {
@@ -3012,12 +3011,17 @@ static int stlink_config_trace(void *handle, bool enabled,
if (!*trace_freq)
*trace_freq = max_trace_freq;
presc = traceclkin_freq / *trace_freq;
unsigned int presc = (traceclkin_freq + *trace_freq / 2) / *trace_freq;
if (presc == 0 || presc > TPIU_ACPR_MAX_SWOSCALER + 1) {
LOG_ERROR("SWO frequency is not suitable. Please choose a different "
"frequency.");
return ERROR_FAIL;
}
if (traceclkin_freq % *trace_freq > 0)
presc++;
if (presc > TPIU_ACPR_MAX_SWOSCALER) {
/* Probe's UART speed must be within 3% of the TPIU's SWO baud rate. */
unsigned int max_deviation = (traceclkin_freq * 3) / 100;
if (presc * *trace_freq < traceclkin_freq - max_deviation ||
presc * *trace_freq > traceclkin_freq + max_deviation) {
LOG_ERROR("SWO frequency is not suitable. Please choose a different "
"frequency.");
return ERROR_FAIL;