/**
* @brief COMP2 configuration.
* @param None
* @retval None
*/
void COMP_Config(void)
{
/* COMP Peripheral clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_COMP, ENABLE);
/* SYSCFG Peripheral clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Close the I/O analog switch number n */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_GR6_2, ENABLE);
/* COMP2 Init: COMP2 is enabled as soon as inverting input is selected */
COMP_InitStructure.COMP_InvertingInput = COMP_InvertingInput_VREFINT;
COMP_InitStructure.COMP_OutputSelect = COMP_OutputSelect_None;
COMP_InitStructure.COMP_Speed = COMP_Speed_Slow;
COMP_Init(&COMP_InitStructure);
/* Configure EXTI Line 22 in interrupt mode */
EXTI_InitStructure.EXTI_Line = EXTI_Line22;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Clear EXTI22 line */
EXTI_ClearITPendingBit(EXTI_Line22);
/* Configure COMP IRQ */
NVIC_InitStructure.NVIC_IRQChannel = COMP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/**
* @brief Configure DAC peripheral
* @param None
* @retval None
*/
static void DAC_Config(void)
{
/* Init DAC channel 1 */
DAC_Init(DAC_Channel_1, DAC_Trigger_None, DAC_OutputBuffer_Disable);
/* Enable DAC channel 1 */
DAC_Cmd(DAC_Channel_1, ENABLE);
/* Set DAC Channel1 DHR register:
* DAC1 output = VREF * DOR / 256 = 3.3 * 116 / 256 = 1.5 V */
DAC_SetChannel1Data(DAC_Align_8b_R, 116);
/* Close I/O Switch 24 to select PE5 as comparator 2 non inverting input:
* External signal should be connected to PE5 */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_24, ENABLE);
}
/**
* @brief Configure Comparator peripheral
* @param None
* @retval None
*/
static void COMP_Config(void)
{
/* Close I/O Switch 23 to select PD0 as comparator 2 non inverting input:
External signal should be connected to PD0 */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_23, ENABLE);
/* Init COMP2: VREFINT is used as COMP2 inverting input
COMP2 output is connected to TIM2 input capture 2 (default configuration)
COMP2 speed is fast */
COMP_Init(COMP_InvertingInput_VREFINT, COMP_OutputSelect_TIM2IC2, COMP_Speed_Fast);
/* COMP2 edge detection: rising edge */
COMP_EdgeConfig(COMP_Selection_COMP2, COMP_Edge_Rising);
}
/**
* @brief Configure Comparator peripheral
* @param None
* @retval None
*/
static void COMP_Config(void)
{
/* Connect internal reference voltage to COMP1 inverting input */
COMP_VrefintToCOMP1Connect(ENABLE);
/* close the analog switch number 14 */
SYSCFG_RIAnalogSwitchConfig(RI_AnalogSwitch_14, ENABLE);
/* close the analog switch number 1 */
SYSCFG_RIAnalogSwitchConfig(RI_AnalogSwitch_1, ENABLE);
/* close the I/O switch number 4 */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_4, ENABLE);
/* Enable COMP1 Interrupt */
COMP_ITConfig(COMP_Selection_COMP1, ENABLE);
/* Configure the event detection */
COMP_EdgeConfig(COMP_Selection_COMP1, COMP_Edge_Rising);
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32l1xx_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32l1xx.c file
*/
/* Initialize LED1 mounted on STM32L1XX-EVAL board */
STM_EVAL_LEDInit(LED1);
/******************** comparator COMP1 configuration ************************/
#ifdef USE_STM32L152_EVAL
/* GPIOB Peripheral clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
/* Configure PB12 in analog mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
#elif USE_STM32L152D_EVAL
/* GPIOF Peripheral clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOF, ENABLE);
/* Configure PF10 in analog mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOF, &GPIO_InitStructure);
#endif
/* COMP Peripheral clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_COMP, ENABLE);
/* Enable the Comparator 1 */
COMP_Cmd(ENABLE);
/* Enable the switch control mode */
SYSCFG_RISwitchControlModeCmd(ENABLE);
/* Close the ADC analog switch VCOMP */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_VCOMP, ENABLE);
#ifdef USE_STM32L152_EVAL
/* Close the I/O analog switch number 18 */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_CH18, ENABLE);
#elif USE_STM32L152D_EVAL
/* Close the I/O analog switch number 31 */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_CH31, ENABLE);
#endif
/* Configure and enable EXTI21 */
EXTI_InitStructure.EXTI_Line = EXTI_Line21;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Configure and enable COMP interrupt */
NVIC_InitStructure.NVIC_IRQChannel = COMP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while (1)
{
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
void COMP_Example(void) {
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32l1xx_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32l1xx.c file
*/
/* Initialize LED1 mounted on STM32L1XX-EVAL board */
GPIO_InitTypeDef GPIO_InitStructure;
/* GPIOB Periph clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
/* Configure PD0 and PD1 or PD3 and PD7 in output pushpull mode */
GPIO_InitStructure.GPIO_Pin = LD_GREEN_GPIO_PIN | LD_BLUE_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/******************** comparator COMP1 configuration ************************/
/* GPIOB Peripheral clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
/* Configure PB12 in analog mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* COMP Peripheral clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_COMP, ENABLE);
/* Enable the Comparator 1 */
COMP_Cmd(ENABLE);
/* Enable the switch control mode */
SYSCFG_RISwitchControlModeCmd(ENABLE);
/* Close the ADC analog switch VCOMP */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_VCOMP, ENABLE);
/* Close the I/O analog switch number 18 */
SYSCFG_RIIOSwitchConfig(RI_IOSwitch_CH18, ENABLE);
/* Configure and enable EXTI21 */
EXTI_InitStructure.EXTI_Line = EXTI_Line21;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Configure and enable COMP interrupt */
NVIC_InitStructure.NVIC_IRQChannel = COMP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while (1) {
}
}
