/**
* @brief This function handles COMP interrupt request.
* @param None
* @retval None
*/
void COMP_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line22) != RESET)
{
if (COMP_GetOutputLevel(COMP_Selection_COMP2) == COMP_OutputLevel_High)
{
/* A rising edge is detected so the input voltage is over VREFINT
and the ADC will be turned on for monitoring input voltage, the COMP2 will be off */
State = STATE_OVER_THRESHOLD;
}
EXTI_ClearITPendingBit(EXTI_Line22);
}
}
/**
* @brief check input voltage level: within the thresholds, above the upper
* threshold or under the lower threshold
* @param None
* @retval None
*/
void CheckState(void)
{
/* Check if COMP2 output level is high */
if ((COMP_GetOutputLevel(COMP_Selection_COMP1) == COMP_OutputLevel_High)
&& (COMP_GetOutputLevel(COMP_Selection_COMP2) == COMP_OutputLevel_High))
{
/* A rising edge is detected so the input voltage is higher than VREFINT */
State = STATE_OVER_THRESHOLD;
}
else if ((COMP_GetOutputLevel(COMP_Selection_COMP1) == COMP_OutputLevel_Low)
&& (COMP_GetOutputLevel(COMP_Selection_COMP2) == COMP_OutputLevel_High))
{
/* A falling edge is detected so the input voltage is lower than VREFINT */
State = STATE_WITHIN_THRESHOLD;
}
else if ((COMP_GetOutputLevel(COMP_Selection_COMP1) == COMP_OutputLevel_Low)
&& (COMP_GetOutputLevel(COMP_Selection_COMP2) == COMP_OutputLevel_Low))
{
State = STATE_UNDER_THRESHOLD;
}
}
/**
* @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
*/
uint32_t index = 0;
/* Configure all GPIO pins in Analog mode for lowsest consumption */
GPIO_Config();
/* ADC configuration: Channel 18 or 31 (PB12 or PF10) is used, End Of Conversion (EOC) interrupt is enabled */
ADC_Config();
#ifdef USE_STM32L152_EVAL
/* LCD GLASS Configuration: LSI as LCD clock source */
LCD_Glass_Config();
/* Initialize the TFT-LCD */
STM32L152_LCD_Init();
#elif defined USE_STM32L152D_EVAL
/* Initialize the TFT-LCD */
STM32L152D_LCD_Init();
#endif
/* Clear the TFT-LCD */
LCD_Clear(LCD_COLOR_WHITE);
while(1)
{
if (State == STATE_OVER_THRESHOLD) /* Input voltage is over the threshold */
{
/* Indicator LED: MCU in RUN mode */
STM_EVAL_LEDOff(LED1);
/* Disable COMP IRQ */
NVIC_InitStructure.NVIC_IRQChannel = COMP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable ADC1 IRQ */
NVIC_InitStructure.NVIC_IRQChannel = ADC1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* COMP clock disable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_COMP, DISABLE);
/* Restore MCU configuration */
RestoreConfiguration();
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConv(ADC1);
/* Wait for ADC to be ready */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS));
while(State == STATE_OVER_THRESHOLD)
{
/* Display measured value on Glass LCD */
DisplayVoltage(ADCVal);
/* Display measured value on LCD */
for (index = 0; index < 20; index++)
{
LCD_DisplayChar(LCD_LINE_3, (319 - (16 * index)), VoltageDisplay[index]);
}
/* Check if the measured value is below the threshold VREFINT: 1.22 V */
if (ADCVal <= 0x000005EA)
{
State = STATE_UNDER_THRESHOLD;
}
}
}
else /* Input voltage is under the threshold */
{
/* LED1 ON: MCU in STOP mode */
STM_EVAL_LEDInit(LED1);
STM_EVAL_LEDOn(LED1);
/* Disable ADC1 IRQ */
NVIC_InitStructure.NVIC_IRQChannel = ADC1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
NVIC_Init(&NVIC_InitStructure);
/* Disable ADC1 */
ADC_Cmd(ADC1, DISABLE);
/* Configure COMP2 with interrupt enabled */
COMP_Config();
/* Check COMP2 output level before entering STOP mode */
if (COMP_GetOutputLevel(COMP_Selection_COMP2) == COMP_OutputLevel_Low)
{
/* Disable LSI oscillator before entering STOP mode */
RCC_LSICmd(DISABLE);
/* Enter STOP mode with regulator in low power */
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
}
}
}
}
/**
* @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();
}
}
}
}
/**
* @brief Main program.
* @param None
* @retval None
*/
void COMP_LDR_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_stm32f30x.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f30x.c file
*/
uint8_t ldrlevel = 11, ldrlevelp = 0, daclevel = 0;
uint16_t tmp = 0;
/* Initialize the TFT-LCD */
STM32303C_LCD_Init();
/* Clear the LCD */
LCD_Clear(LCD_COLOR_BLACK);
/* Set the LCD Back Color */
LCD_SetBackColor(LCD_COLOR_BLACK);
/* Set the LCD Text Color */
LCD_SetTextColor(LCD_COLOR_WHITE);
/* Displays Light dependent resistor (LDR) message on line 0 */
LCD_DisplayStringLine(LINE(0), (uint8_t *)MESSAGE1);
/* COMP Configuration */
COMP_Config();
/* DAC channel 1 Configuration */
DAC_Config();
/* Infinite loop */
while (1)
{
for(daclevel = 0; daclevel < 11; daclevel++)
{
/* Set DAC Channel1 DHR register */
DAC_SetChannel1Data(DAC_Align_12b_R, (uint16_t)(daclevel * 150));
Delay((0xFFFF));
/* Check on the Comp output level*/
if (COMP_GetOutputLevel(COMP_Selection_COMP7) == COMP_OutputLevel_High)
{
ldrlevel--;
}
}
switch(ldrlevel)
{
case 1:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 0 ");
break;
case 2:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 1 ");
break;
case 3:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 2 ");
break;
case 4:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 3 ");
break;
case 5:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 4 ");
break;
case 6:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 5 ");
break;
case 7:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 6 ");
break;
case 8:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 7 ");
break;
case 9:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 8 ");
break;
case 10:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 9 ");
break;
case 11:
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 10 ");
break;
default :
/* Displays MESSAGE on line 7 */
LCD_DisplayStringLine(LINE(7), (uint8_t *)" Level 0 ");
ldrlevel = 1;
break;
}
if(ldrlevelp != ldrlevel)
{
/* Set the LCD Text Color */
LCD_SetTextColor(LCD_COLOR_WHITE);
/* Displays a rectangle on the LCD */
LCD_DrawRect(199, 311, 22, 302 );
/* Set the LCD Back Color */
LCD_SetBackColor(LCD_COLOR_BLACK);
LCD_SetTextColor(LCD_COLOR_BLACK);
LCD_DrawFullRect(200, 310, 300, 20);
/* Set the LCD Text Color */
LCD_SetTextColor(LCD_COLOR_YELLOW);
/* Set the LCD Back Color */
LCD_SetBackColor(LCD_COLOR_YELLOW);
/* Displays a full rectangle */
tmp = 30 * (ldrlevel-1);
if (tmp ==0) tmp = 5;
LCD_DrawFullRect(200, 310, tmp , 20);
}
ldrlevelp = ldrlevel;
ldrlevel = 11;
/* Set the LCD Back Color */
LCD_SetBackColor(LCD_COLOR_BLACK);
}
}
