void analogin_init(analogin_t *obj, PinName pin)
{
uint32_t function = (uint32_t)NC;
// ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
// are described in PinNames.h and PeripheralPins.c
// Pin value must be between 0xF0 and 0xFF
if ((pin < 0xF0) || (pin >= 0x100)) {
// Normal channels
// Get the peripheral name from the pin and assign it to the object
obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC);
// Get the functions (adc channel) from the pin and assign it to the object
function = pinmap_function(pin, PinMap_ADC);
// Configure GPIO
pinmap_pinout(pin, PinMap_ADC);
} else {
// Internal channels
obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC_Internal);
function = pinmap_function(pin, PinMap_ADC_Internal);
// No GPIO configuration for internal channels
}
MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
MBED_ASSERT(function != (uint32_t)NC);
obj->channel = STM_PIN_CHANNEL(function);
// Save pin number for the read function
obj->pin = pin;
// Configure ADC object structures
obj->handle.State = HAL_ADC_STATE_RESET;
obj->handle.Init.OversamplingMode = DISABLE;
obj->handle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV1;
obj->handle.Init.Resolution = ADC_RESOLUTION_12B;
obj->handle.Init.SamplingTime = ADC_SAMPLETIME_160CYCLES_5;
obj->handle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
obj->handle.Init.ContinuousConvMode = DISABLE;
obj->handle.Init.DiscontinuousConvMode = DISABLE;
obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
obj->handle.Init.ExternalTrigConv = ADC_EXTERNALTRIG0_T6_TRGO; // Not used here
obj->handle.Init.DMAContinuousRequests = DISABLE;
obj->handle.Init.EOCSelection = EOC_SINGLE_CONV;
obj->handle.Init.Overrun = OVR_DATA_OVERWRITTEN;
obj->handle.Init.LowPowerAutoWait = ENABLE;
obj->handle.Init.LowPowerFrequencyMode = DISABLE; // To be enabled only if ADC clock < 2.8 MHz
obj->handle.Init.LowPowerAutoPowerOff = DISABLE;
__HAL_RCC_ADC1_CLK_ENABLE();
if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
error("Cannot initialize ADC");
}
if (!HAL_ADCEx_Calibration_GetValue(&obj->handle, ADC_SINGLE_ENDED)) {
HAL_ADCEx_Calibration_Start(&obj->handle, ADC_SINGLE_ENDED);
}
__HAL_ADC_ENABLE(&obj->handle);
}
void analogin_init(analogin_t *obj, PinName pin)
{
uint32_t function = (uint32_t)NC;
// ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
// are described in PinNames.h and PeripheralPins.c
// Pin value must be between 0xF0 and 0xFF
if ((pin < 0xF0) || (pin >= 0x100)) {
// Normal channels
// Get the peripheral name from the pin and assign it to the object
obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC);
// Get the functions (adc channel) from the pin and assign it to the object
function = pinmap_function(pin, PinMap_ADC);
// Configure GPIO
pinmap_pinout(pin, PinMap_ADC);
} else {
// Internal channels
obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC_Internal);
function = pinmap_function(pin, PinMap_ADC_Internal);
// No GPIO configuration for internal channels
}
MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
MBED_ASSERT(function != (uint32_t)NC);
obj->channel = STM_PIN_CHANNEL(function);
// Save pin number for the read function
obj->pin = pin;
// Configure ADC object structures
obj->handle.State = HAL_ADC_STATE_RESET;
obj->handle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
obj->handle.Init.Resolution = ADC_RESOLUTION_12B;
obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
obj->handle.Init.ScanConvMode = DISABLE;
obj->handle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
obj->handle.Init.LowPowerAutoWait = DISABLE;
obj->handle.Init.ContinuousConvMode = DISABLE;
obj->handle.Init.NbrOfConversion = 1;
obj->handle.Init.DiscontinuousConvMode = DISABLE;
obj->handle.Init.NbrOfDiscConversion = 0;
obj->handle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
obj->handle.Init.DMAContinuousRequests = DISABLE;
obj->handle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
#if defined(ADC1)
if ((ADCName)obj->handle.Instance == ADC_1) {
__HAL_RCC_ADC1_CLK_ENABLE();
}
#endif
#if defined(ADC2)
if ((ADCName)obj->handle.Instance == ADC_2) {
__HAL_RCC_ADC2_CLK_ENABLE();
}
#endif
#if defined(ADC3)
if ((ADCName)obj->handle.Instance == ADC_3) {
__HAL_RCC_ADC34_CLK_ENABLE();
}
#endif
#if defined(ADC4)
if ((ADCName)obj->handle.Instance == ADC_4) {
__HAL_RCC_ADC34_CLK_ENABLE();
}
#endif
if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
error("Cannot initialize ADC\n");
}
if (!HAL_ADCEx_Calibration_GetValue(&obj->handle, ADC_SINGLE_ENDED)) {
HAL_ADCEx_Calibration_Start(&obj->handle, ADC_SINGLE_ENDED);
}
}
