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drivers/jlink: fix (again) calculate_swo_prescaler formula 

The prescaler computation should round at the nearest integer
value, not to the next integer value.

Change-Id: I957e0774421211f3c4ba4b312738b1c67b87c4a2
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: 051e80812b ("drivers/jlink: fix calculate_swo_prescaler formula")
Reviewed-on: http://openocd.zylin.com/5846
Tested-by: jenkins
Reviewed-by: Adrian M Negreanu <adrian.negreanu@nxp.com>
This commit is contained in:
Antonio Borneo 2020-10-01 14:19:16 +02:00
parent 87d2651edc
commit 9a877a83a1
1 changed files with 1 additions and 2 deletions
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src/jtag/drivers/jlink.c
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@ -1269,8 +1269,7 @@ static uint32_t calculate_trace_buffer_size(void)
static bool calculate_swo_prescaler(unsigned int traceclkin_freq, static bool calculate_swo_prescaler(unsigned int traceclkin_freq,
uint32_t trace_freq, uint16_t *prescaler) uint32_t trace_freq, uint16_t *prescaler)
{ {
unsigned int presc; unsigned int presc = (traceclkin_freq + trace_freq / 2) / trace_freq;
presc = DIV_ROUND_UP(traceclkin_freq, trace_freq);
if (presc > TPIU_ACPR_MAX_SWOSCALER) if (presc > TPIU_ACPR_MAX_SWOSCALER)
return false; return false;