115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/* Project L476_ats_blink for STM32L476 mounted on Nucleo board:
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* the user LED (mounted on pin PA-5) is flashed every second for 50 ms.
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* The time base is provided by Systick (1000 ticks per second).
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* The clock configuration is the default one (Sysclk = 80 MHz, derived from MSI and PLL).
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32l4xx_ll_bus.h"
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#include "stm32l4xx_ll_rcc.h"
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#include "stm32l4xx_ll_system.h"
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#include "stm32l4xx_ll_utils.h"
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#include "stm32l4xx_ll_gpio.h"
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#include "stm32l4xx_ll_cortex.h"
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// #if defined(USE_FULL_ASSERT)
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// #include "stm32_assert.h"
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// #endif /* USE_FULL_ASSERT */
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#include "gpio.h"
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// systick interrupt handler
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volatile uint32_t msTicks = 0;
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volatile uint8_t expe = 0;
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volatile uint8_t blue_mode = 0;
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void SysTick_Handler()
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{
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if ( BLUE_BUTTON() ){
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blue_mode = 1 ;
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}
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msTicks++; /* See startup file startup_LPC17xx.s for SysTick vector */
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if (msTicks == 5){
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LED_GREEN(0);
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}else if(msTicks >= 200){
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msTicks = 0;
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LED_GREEN(1);
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}
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}
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void SystemClock_Config(void);
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int main(void)
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{
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/* Configure the system clock */
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SystemClock_Config();
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// config GPIO
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GPIO_init();
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// init systick timer (tick period at 1 ms)
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LL_Init1msTick( SystemCoreClock );
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LL_SYSTICK_EnableIT();
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//Setup Sleep mode
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LL_LPM_EnableSleep();
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//LL_LPM_EnableSleepOnExit();
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while (1) {
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if (blue_mode){
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__WFI();
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}
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// else {
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// LED_GREEN(0);
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// LL_mDelay(950);
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// LED_GREEN(1);
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// LL_mDelay(50);
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// }
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}
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follows :
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* System Clock source = PLL (MSI)
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* SYSCLK(Hz) = 80000000
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* HCLK(Hz) = 80000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 1
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* APB2 Prescaler = 1
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* MSI Frequency(Hz) = 4000000
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* PLL_M = 1
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* PLL_N = 40
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* PLL_R = 2
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* Flash Latency(WS) = 4
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void) {
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/* MSI configuration and activation */
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LL_FLASH_SetLatency(LL_FLASH_LATENCY_4);
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LL_RCC_MSI_Enable();
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while (LL_RCC_MSI_IsReady() != 1)
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{ };
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/* Main PLL configuration and activation */
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 40, LL_RCC_PLLR_DIV_2);
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LL_RCC_PLL_Enable();
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LL_RCC_PLL_EnableDomain_SYS();
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while(LL_RCC_PLL_IsReady() != 1)
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{ };
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/* Sysclk activation on the main PLL */
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LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
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LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
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while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
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{ };
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/* Set APB1 & APB2 prescaler*/
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LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
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LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
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/* Update the global variable called SystemCoreClock */
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SystemCoreClockUpdate();
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}
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