I'm trying to get the ADC set up on the IoT discovery board. I did this successfully on the F411 so I thought it would be easy to move the code over, but I can't get it working.
I'm trying to use PC0.
The conversion is always returning 334 or 335, regardless of the pot value I have connected, so I'm sure it's just garbage.
Anything wrong with my configuration?
GPIO_InitTypeDef gpioInit;
ADC_HandleTypeDef g_AdcHandle;
__GPIOC_CLK_ENABLE();
__HAL_RCC_ADC_CLK_ENABLE();
gpioInit.Pin = GPIO_PIN_0;
gpioInit.Mode = GPIO_MODE_ANALOG;
gpioInit.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &gpioInit);
ADC_ChannelConfTypeDef adcChannel;
g_AdcHandle.Instance = ADC1;
g_AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
g_AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
g_AdcHandle.Init.ScanConvMode = DISABLE;
g_AdcHandle.Init.ContinuousConvMode = ENABLE;
g_AdcHandle.Init.DiscontinuousConvMode = DISABLE;
g_AdcHandle.Init.NbrOfDiscConversion = 0;
g_AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
g_AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
g_AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
g_AdcHandle.Init.NbrOfConversion = 1;
g_AdcHandle.Init.DMAContinuousRequests = DISABLE;
g_AdcHandle.Init.EOCSelection = DISABLE;
HAL_ADC_Init(&g_AdcHandle);
adcChannel.Channel = ADC_CHANNEL_1;
adcChannel.Rank = 1;
adcChannel.SamplingTime = ADC_SAMPLETIME_247CYCLES_5;
adcChannel.Offset = 0;
if (HAL_ADC_ConfigChannel(&g_AdcHandle, &adcChannel) != HAL_OK)
{
AZURE_PRINTF("ADC Error\r\n");
while(1){};
}
volatile uint32_t g_ADCValue;
volatile int g_MeasurementNumber;
HAL_ADC_Start(&g_AdcHandle);
for (;;)
{
if (HAL_ADC_PollForConversion(&g_AdcHandle, 1000000) == HAL_OK)
{
g_ADCValue = HAL_ADC_GetValue(&g_AdcHandle);
AZURE_PRINTF("%u\r\n", g_ADCValue);
g_MeasurementNumber++;
}
}
