Код: Выделить всё
#define WAITWHILE(x) do{StartUpCounter = 0; while((x) && (++StartUpCounter < 0xffffff)){nop();} if(StartUpCounter == 0xffffff) return 0;}while(0)
int StartHSE(){ // fVCO can be from 192 to 432MHz
__IO uint32_t StartUpCounter = 0;
RCC->CR = (RCC->CR & ~RCC_CR_PLLON) | RCC_CR_HSEON; // disable PLL to reconfigure, enable HSE
WAITWHILE(!(RCC->CR & RCC_CR_HSERDY));
/* Enable high performance mode, System frequency up to 168 MHz */
RCC->APB1ENR |= RCC_APB1ENR_PWREN;
PWR->CR |= PWR_CR_VOS;
// HCLK = SYSCLK, PCLK1 = HCLK/4, PCLK2 = HCLK/2
RCC->CFGR = (RCC->CFGR & ~(RCC_CFGR_HPRE | RCC_CFGR_PPRE1 | RCC_CFGR_PPRE2)
) | RCC_CFGR_HPRE_DIV1 | RCC_CFGR_PPRE1_DIV4 | RCC_CFGR_PPRE2_DIV2;
/* Configure the main PLL */
RCC->PLLCFGR = PLL_M | (PLL_N << 6) | (((PLL_P >> 1) -1) << 16) |
(RCC_PLLCFGR_PLLSRC_HSE) | (PLL_Q << 24);
RCC->CR |= RCC_CR_PLLON; // Enable PLL
// Wait till PLL is ready
WAITWHILE(!(RCC->CR & RCC_CR_PLLRDY));
/* Configure Flash prefetch, Instruction cache, Data cache and wait state */
FLASH->ACR = FLASH_ACR_ICEN |FLASH_ACR_DCEN |FLASH_ACR_LATENCY_5WS;
// Select PLL as system clock source
RCC->CFGR = (RCC->CFGR & ~RCC_CFGR_SW) | RCC_CFGR_SW_PLL;
// Wait till PLL is used as system clock source
WAITWHILE((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
return 1;
}Как такое может быть?
Да, если не вызывать эту StartHSE или SysTick_Config, то светодиодом моргает.
