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stmhal/mphalport: Get ticks_cpu() working on F7 MCUs.

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This commit is contained in:
Damien George 2017-03-10 14:58:26 +11:00
parent c9705cff68
commit 4351d16e62
1 changed files with 4 additions and 0 deletions
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4
stmhal/mphalport.c
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@ -72,6 +72,10 @@ void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
void mp_hal_ticks_cpu_enable(void) { void mp_hal_ticks_cpu_enable(void) {
if (!mp_hal_ticks_cpu_enabled) { if (!mp_hal_ticks_cpu_enabled) {
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk; 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->CYCCNT = 0;
DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk; DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
mp_hal_ticks_cpu_enabled = true; mp_hal_ticks_cpu_enabled = true;