Posted on July 01, 2015 at 01:16 Existing code, ADC2_IN1 on PA1 works polled 100 numbers vary from 150 to 3050 sinusoid. HW guy added ADC3_IN2 on PA2.
Changed the code as below, but 100 numbers are all between 3013 and 3015, although can see a clipped sinusoid on Bitscope. Any ideas what to check?
void ecg_init (void)
{
static GPIO_InitTypeDef GPIO_InitStructure;
static ADC_InitTypeDef ADC_InitStructure;
// [dy] ECG_OUT2 is on PA2 ADC3_IN2
RCC_AHB1PeriphClockCmd(BSP_ECG_ANALOG_INPUT_GPIO_RCC_AHB1_PERIPH, ENABLE);
// [dy-ECG1] RCC_APB2PeriphClockCmd(BSP_ECG_ANALOG_INPUT_ADC_RCC_APB2_PERIPH, ENABLE);
//[dy] RCC Enable for ECG2
RCC_APB2PeriphClockCmd(BSP_ECG2_ANALOG_INPUT_ADC_RCC_APB2_PERIPH, ENABLE);
/* Configure GPIO (ECG) as analog input ******************************/
//[dy] GPIO_Pin_2 for ECG2
GPIO_InitStructure.GPIO_Pin = /* [dy-ECG1] BSP_ECG_ANALOG_INPUT_GPIO_PIN |*/ BSP_ECG2_ANALOG_INPUT_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(BSP_ECG_ANALOG_INPUT_GPIO_PORT, &GPIO_InitStructure);
ssm_adc_common_init ();
/* ADC ECG Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; // THIS WAS Different
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
// [dy-ECG1] ADC_Init(BSP_ECG_ANALOG_INPUT_ADC_NUM, &ADC_InitStructure);
// [dy] ADC_Init for ECG2
ADC_Init(BSP_ECG2_ANALOG_INPUT_ADC_NUM, &ADC_InitStructure);
// [dy] BSP_ECG2_ANALOG_INPUT_ADC_NUM ADC3
// NV 20130926 KEY Do this only once...
#ifdef ECG1
ADC_RegularChannelConfig(BSP_ECG_ANALOG_INPUT_ADC_NUM,
BSP_ECG_ANALOG_INPUT_ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);
ADC_Cmd(BSP_ECG_ANALOG_INPUT_ADC_NUM, ENABLE);
#endif
// [dy] BSP_ECG2_ANALOG_INPUT_ADC_CHANNEL ADC_Channel_2 ...
ADC_RegularChannelConfig(BSP_ECG2_ANALOG_INPUT_ADC_NUM,
BSP_ECG2_ANALOG_INPUT_ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);
ADC_Cmd(BSP_ECG2_ANALOG_INPUT_ADC_NUM, ENABLE);
}
