You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
40 lines
1.0 KiB
40 lines
1.0 KiB
void clock_init(void) {
|
|
// enable external oscillator
|
|
RCC->CR |= RCC_CR_HSEON;
|
|
while ((RCC->CR & RCC_CR_HSERDY) == 0);
|
|
|
|
// divide shit
|
|
RCC->CFGR = RCC_CFGR_HPRE_DIV1 | RCC_CFGR_PPRE2_DIV2 | RCC_CFGR_PPRE1_DIV4;
|
|
|
|
// 16mhz crystal
|
|
RCC->PLLCFGR = RCC_PLLCFGR_PLLQ_2 | RCC_PLLCFGR_PLLM_3 |
|
|
RCC_PLLCFGR_PLLN_6 | RCC_PLLCFGR_PLLN_5 | RCC_PLLCFGR_PLLSRC_HSE;
|
|
|
|
// start PLL
|
|
RCC->CR |= RCC_CR_PLLON;
|
|
while ((RCC->CR & RCC_CR_PLLRDY) == 0);
|
|
|
|
// Configure Flash prefetch, Instruction cache, Data cache and wait state
|
|
// *** without this, it breaks ***
|
|
FLASH->ACR = FLASH_ACR_ICEN | FLASH_ACR_DCEN | FLASH_ACR_LATENCY_5WS;
|
|
|
|
// switch to PLL
|
|
RCC->CFGR |= RCC_CFGR_SW_PLL;
|
|
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
|
|
|
|
// *** running on PLL ***
|
|
}
|
|
|
|
void watchdog_init(void) {
|
|
// setup watchdog
|
|
IWDG->KR = 0x5555;
|
|
IWDG->PR = 0; // divider /4
|
|
// 0 = 0.125 ms, let's have a 50ms watchdog
|
|
IWDG->RLR = 400 - 1;
|
|
IWDG->KR = 0xCCCC;
|
|
}
|
|
|
|
void watchdog_feed(void) {
|
|
IWDG->KR = 0xAAAA;
|
|
}
|
|
|
|
|