STM32L011 硬件模拟比较器(窗口模式)

没有难度,非常好理解,不理解的看前文.
https://www.lijingquan.net/2017/01/27/stm32l011-%e7%a1%ac%e4%bb%b6%e6%a8%a1%e6%8b%9f%e6%af%94%e8%be%83%e5%99%a8/

#include "stm32l0xx.h"
__IO uint32_t uwTick;
__IO uint8_t window = 1;
void SysTick_Delay(__IO uint32_t Delay)
{
    uint32_t tickstart = 0U;
    tickstart = uwTick;
    while((uwTick - tickstart) < Delay)
    {
    }
}
void RCC_Init(void)
{
    /* LSE OFF,LSI DEFAULT,MSI OFF,HSI ON,PLL ON,SYSCLK = 32MHz,CK_PWR = FCLK = HCLK = SysTick = APB1 = APB2 = 32MHz.*/
    FLASH->ACR = FLASH_ACR_PRE_READ | FLASH_ACR_PRFTEN;
    MODIFY_REG(PWR->CR, PWR_CR_VOS, (PWR_CR_VOS_0));
    MODIFY_REG(RCC->CR, RCC_CR_HSION | RCC_CR_HSIDIVEN , RCC_CR_HSION);
    while(READ_BIT(RCC->CR, RCC_CR_HSIRDY) == RESET);
    MODIFY_REG(RCC->ICSCR, RCC_ICSCR_HSITRIM, (uint32_t)(16) << 8U);
    CLEAR_BIT(RCC->CR, RCC_CR_PLLON);
    while(READ_BIT(RCC->CR, RCC_CR_PLLRDY) != RESET);
    MODIFY_REG(RCC->CFGR, RCC_CFGR_PLLMUL | RCC_CFGR_PLLDIV | RCC_CFGR_PLLSRC, (uint32_t)((RCC_CFGR_PLLMUL4) | (RCC_CFGR_PLLDIV2) | (RCC_CFGR_PLLSRC_HSI)));
    SET_BIT(RCC->CR, RCC_CR_PLLON);
    while(READ_BIT(RCC->CR, RCC_CR_PLLRDY) == RESET);
    MODIFY_REG(FLASH->ACR, FLASH_ACR_LATENCY, (uint32_t)(0x01U));
    MODIFY_REG(RCC->CFGR, RCC_CFGR_HPRE, RCC_CFGR_HPRE_DIV1);
    MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, RCC_CFGR_SW_PLL);
    while ((uint32_t)(RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
    MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE1, RCC_CFGR_PPRE1_DIV1);
    MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE2, ((RCC_CFGR_PPRE1_DIV1) << 3));
    CLEAR_BIT(RCC->CR, RCC_CR_MSION);
    /* SysTick CLK = 4MHz,Reload = 1kHz. */
    SysTick->LOAD  = (uint32_t)0x00000F9FUL;
    NVIC_SetPriority (SysTick_IRQn, (1UL << __NVIC_PRIO_BITS) - 1UL);
    SysTick->VAL   = 0UL;
    SysTick->CTRL  = SysTick_CTRL_TICKINT_Msk | SysTick_CTRL_ENABLE_Msk;
    /* SysTick->CTRL  = SysTick_CTRL_TICKINT_Msk; */
}
void ADC1_COMP_IRQHandler(void)
{
    if(READ_BIT(EXTI->PR, EXTI_IMR_IM21) != RESET)
    {
      WRITE_REG(EXTI->PR, (EXTI_IMR_IM21 | EXTI_IMR_IM22));
			window = ((COMP2->CSR & COMP_CSR_COMP2VALUE)>>30) + ((COMP1->CSR & COMP_CSR_COMP1VALUE)>>30); /* 等于0,下越边界,等于1,合理,等于2,上越边界. */
    }
}
void Comp_Init(void)
{
    /* 初始化时钟 */
    SET_BIT(RCC->IOPENR, RCC_IOPENR_GPIOAEN);
    SET_BIT(RCC->APB2ENR, RCC_APB2ENR_SYSCFGEN); /* COMP共享这个时钟 */
    /* COMP专用内部参考电压 */
    SET_BIT(SYSCFG->CFGR3, SYSCFG_CFGR3_ENBUFLP_VREFINT_COMP  );
    /* 上电没配置过,默认除了JTAG外引脚都是模拟引脚,所以懒得配置了. */
    /* PA6/PA7 COMP OUT */
    MODIFY_REG(GPIOA->MODER, GPIO_MODER_MODE6 | GPIO_MODER_MODE4, GPIO_MODER_MODE6_1 | GPIO_MODER_MODE4_1);
    MODIFY_REG(GPIOA->AFR[0], GPIO_AFRL_AFRL6, (0x07 << GPIO_AFRL_AFRL6_Pos) );
    MODIFY_REG(GPIOA->AFR[0], GPIO_AFRL_AFRL7, (0x07 << GPIO_AFRL_AFRL7_Pos) );
    /* Vref > PA3 > 1/4 Vref */
    COMP1->CSR = 0x00000001;
    COMP2->CSR = 0x00000049;
    /* COMP1占用21线中断,COMP2占用22线中断.因为窗口比较,所以两个中断都要用. */
    /* 上降沿中断 */
    SET_BIT(EXTI->RTSR, EXTI_IMR_IM21 | EXTI_IMR_IM22);
    /* 下降沿中断 */
    SET_BIT(EXTI->FTSR, EXTI_IMR_IM21 | EXTI_IMR_IM22);
    /* 清中断标志 */
    WRITE_REG(EXTI->PR, EXTI_IMR_IM21 | EXTI_IMR_IM22);
    /* 开中断模式 */
    SET_BIT(EXTI->IMR, EXTI_IMR_IM21 | EXTI_IMR_IM22);
    NVIC_SetPriority(ADC1_COMP_IRQn, 0);
    NVIC_EnableIRQ(ADC1_COMP_IRQn);
}
int main(void)
{
    RCC_Init();
    Comp_Init();
    while (1)
    {
        SysTick_Delay(window * 1000);
    }
}