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40 lines
1.0 KiB
40 lines
1.0 KiB
void clock_init(void) {
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// enable external oscillator
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RCC->CR |= RCC_CR_HSEON;
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while ((RCC->CR & RCC_CR_HSERDY) == 0);
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// divide things
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RCC->CFGR = RCC_CFGR_HPRE_DIV1 | RCC_CFGR_PPRE2_DIV2 | RCC_CFGR_PPRE1_DIV4;
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// 16mhz crystal
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RCC->PLLCFGR = RCC_PLLCFGR_PLLQ_2 | RCC_PLLCFGR_PLLM_3 |
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RCC_PLLCFGR_PLLN_6 | RCC_PLLCFGR_PLLN_5 | RCC_PLLCFGR_PLLSRC_HSE;
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// start PLL
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RCC->CR |= RCC_CR_PLLON;
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while ((RCC->CR & RCC_CR_PLLRDY) == 0);
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// Configure Flash prefetch, Instruction cache, Data cache and wait state
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// *** without this, it breaks ***
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FLASH->ACR = FLASH_ACR_ICEN | FLASH_ACR_DCEN | FLASH_ACR_LATENCY_5WS;
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// switch to PLL
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RCC->CFGR |= RCC_CFGR_SW_PLL;
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while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
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// *** running on PLL ***
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}
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void watchdog_init(void) {
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// setup watchdog
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IWDG->KR = 0x5555;
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IWDG->PR = 0; // divider /4
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// 0 = 0.125 ms, let's have a 50ms watchdog
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IWDG->RLR = 400 - 1;
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IWDG->KR = 0xCCCC;
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}
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void watchdog_feed(void) {
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IWDG->KR = 0xAAAA;
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}
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