/**
* @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);
}
void PowerMonitor_Init(void) {
uint32_t temp32u;
COMP_InitTypeDef COMP_InitStructure;
COMP_CVRefInitTypeDef COMP_CVRefInitStructure;
PORT_InitTypeDef PORT_InitStructure;
COMP_StructInit(&COMP_InitStructure);
COMP_InitStructure.COMP_PlusInputSource = COMP_PlusInput_CVREF;
COMP_InitStructure.COMP_MinusInputSource = COMP_MinusInput_IN1;
COMP_Init(&COMP_InitStructure);
COMP_CVRefStructInit(&COMP_CVRefInitStructure);
COMP_CVRefInitStructure.COMP_CVRefSource = COMP_CVREF_SOURCE_AVdd;
COMP_CVRefInitStructure.COMP_CVRefRange = COMP_CVREF_RANGE_Up;
COMP_CVRefInitStructure.COMP_CVRefScale = COMP_CVREF_SCALE_14_div_32;
COMP_CVRefInit(&COMP_CVRefInitStructure);
COMP_Cmd(ENABLE);
COMP_CVRefCmd(ENABLE);
while(COMP_GetCfgFlagStatus(COMP_CFG_FLAG_READY) != SET);
// Setup GPIO
PORT_StructInit(&PORT_InitStructure);
PORT_InitStructure.PORT_Pin = (1 << POWER_MONITOR_PIN);
PORT_Init(POWER_MONITOR_PORT, &PORT_InitStructure);
// Wait until power supply is stable
temp32u = DWT_StartDelayUs(50000);
while (DWT_DelayInProgress(temp32u)) {
if (COMP_GetFlagStatus(COMP_STATUS_FLAG_SY) == SET) {
// False triggering - restart delay
temp32u = DWT_StartDelayUs(50000);
}
}
// Read and clear comparator result latch
COMP_GetResultLatch();
COMP_ITConfig(ENABLE);
NVIC_EnableIRQ(COMPARATOR_IRQn);
}
/**
* @brief Main program.
* @param None
* @retval None
*/
void main(void)
{
/*************** Initialize LEDs available on STM8L15X-EVAL board ***********/
STM_EVAL_LEDInit(LED1);
STM_EVAL_LEDInit(LED2);
/* CLK configuration -------------------------------------------*/
CLK_Config();
/* ADC configuration -------------------------------------------*/
ADC_Config();
/* COMP configuration -------------------------------------------*/
COMP_Config();
while (1)
{
if (State != STATE_UNDER_THRESHOLD) /* Input voltage is over the threshold VREFINT */
{
/* LD1 ON and LD2 OFF: MCU in run mode */
STM_EVAL_LEDOn(LED1);
STM_EVAL_LEDOff(LED2);
/* Disable global Interrupts */
disableInterrupts();
/* Disable COMP clock */
CLK_PeripheralClockConfig(CLK_Peripheral_COMP, DISABLE);
/* Enable ADC1 clock */
CLK_PeripheralClockConfig(CLK_Peripheral_ADC1, ENABLE);
/* Enable end of conversion ADC1 Interrupt */
ADC_ITConfig(ADC1, ADC_IT_EOC, DISABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConv(ADC1);
/* Wait for first end of conversion */
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
ADCVal = ADC_GetConversionValue(ADC1);
/* Enable global Interrupts */
enableInterrupts();
/* Enable end of conversion ADC1 Interrupt */
ADC_ITConfig(ADC1, ADC_IT_EOC, ENABLE);
while (State == STATE_OVER_THRESHOLD)
{}
}
else /* Input voltage is under the threshold */
{
/* LD1 OFF and LD2 ON: MCU in halt mode */
STM_EVAL_LEDOff(LED1);
STM_EVAL_LEDOn(LED2);
/* Disable global Interrupts */
disableInterrupts();
/* Clear EOC and OVR flags */
ADC_ClearFlag(ADC1, (ADC_FLAG_TypeDef) (ADC_FLAG_EOC | ADC_FLAG_OVER));
/* Disable ADC1 */
ADC_Cmd(ADC1, DISABLE);
/* Disable ADC1 clock */
CLK_PeripheralClockConfig(CLK_Peripheral_ADC1, DISABLE);
/* Enable COMP clock */
CLK_PeripheralClockConfig(CLK_Peripheral_COMP, ENABLE);
/* Enable COMP2 Interrupt */
COMP_ITConfig(COMP_Selection_COMP2, ENABLE);
/* Enable global Interrupts */
enableInterrupts();
/* Check COMP2 output level before entering halt mode */
if (COMP_GetOutputLevel(COMP_Selection_COMP2) == COMP_OutputLevel_Low)
{
/* Enter halt mode */
halt();
}
}
}
}