diff options
| -rw-r--r-- | stmhal/mphalport.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/stmhal/mphalport.c b/stmhal/mphalport.c index 64c1164cc..dff781ff2 100644 --- a/stmhal/mphalport.c +++ b/stmhal/mphalport.c @@ -72,6 +72,10 @@ void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) { void mp_hal_ticks_cpu_enable(void) { if (!mp_hal_ticks_cpu_enabled) { CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk; + #if defined(__CORTEX_M) && __CORTEX_M == 7 + // on Cortex-M7 we must unlock the DWT before writing to its registers + DWT->LAR = 0xc5acce55; + #endif DWT->CYCCNT = 0; DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk; mp_hal_ticks_cpu_enabled = true; |