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AP_HAL_ChibiOS: error if system clock not 1mhz on 16 CH_CFG_ST_RESOLUTION. prevent variable overflow 

if CH_CFG_ST_FREQUENCY not match 1000000U on 16 bit CH_CFG_ST_RESOLUTION
we try to multiply now *= 1000000U/CH_CFG_ST_FREQUENCY; it may overflow 16 bit value.
This commit is contained in:
Ivannikov Kirill 2020-04-26 10:58:53 +03:00 committed by Andrew Tridgell
parent f882bd0c3e
commit 3ab1b29397
1 changed files with 1 additions and 1 deletions
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2
libraries/AP_HAL_ChibiOS/hwdef/common/hrt.c
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@ -46,7 +46,7 @@ static uint32_t system_time_u32_us(void)
{
systime_t now = chVTGetSystemTimeX();
#if CH_CFG_ST_FREQUENCY != 1000000U
now *= 1000000U/CH_CFG_ST_FREQUENCY;
#error "must use 32 bit timer if system clock not 1MHz"
#endif
static systime_t last_systime;
static uint32_t timer_base_us32;