Posted on November 14, 2013 at 14:57Hello everyone,
I've been trying to discover the STM32F4-Discovery features and peripheral examples of its firmware package lately. I'm having trouble with the ADC-DMA example. Actually, I wanted to observe only continuous mode of ADC is working. So, I removed codes related to DMA. But, when I run the program, it stucks in the HardFault_Handler function. I don't know why this happens. Can anyone tell me what is wrong with this code? Here is my code below.
&sharpinclude ''stm32f4_discovery.h''
&sharpinclude <stdio.h>
//&sharpdefine ADC3_DR_ADDRESS ((uint32_t)0x4001224C)
__IO uint16_t ADC3ConvertedValue = 0;
__IO uint32_t ADC3ConvertedVoltage = 0;
void ADC3_Config(void);
int main(void)
{
ADC3_Config();
/* Start ADC3 Software Conversion */
ADC_SoftwareStartConv(ADC3);
while(ADC_GetFlagStatus(ADC3, ADC_FLAG_EOC) == RESET);
while (1)
{
ADC3ConvertedValue = ADC_GetConversionValue(ADC3);
ADC3ConvertedVoltage = ADC3ConvertedValue *3.3/0xFFF;
if(ADC3ConvertedVoltage >=0 && ADC3ConvertedVoltage < 1)
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
GPIO_SetBits(GPIOD, GPIO_Pin_12);
}
else if(ADC3ConvertedVoltage >=1 && ADC3ConvertedVoltage < 1.8)
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
GPIO_SetBits(GPIOD, GPIO_Pin_13);
}
else if(ADC3ConvertedVoltage >=1.8 && ADC3ConvertedVoltage < 2.5)
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
GPIO_SetBits(GPIOD, GPIO_Pin_14);
}
if(ADC3ConvertedVoltage >=2.5 && ADC3ConvertedVoltage < 3.3)
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
GPIO_SetBits(GPIOD, GPIO_Pin_15);
}
else
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
GPIO_SetBits(GPIOD, GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
}
}
}
void ADC3_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable ADC3 and GPIO clocks ****************************************/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
/* Configure ADC3 Channel12 pin as analog input ******************************/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure PD12, PD13, PD14 and PD15 in output pushpull mode ************* */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC3 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC3, &ADC_InitStructure);
/* ADC3 regular channel12 configuration *************************************/
ADC_RegularChannelConfig(ADC3, ADC_Channel_12, 1, ADC_SampleTime_3Cycles);
/* Enable ADC3 */
ADC_Cmd(ADC3, ENABLE);
}
#adc-example #adc
