/// \classmethod \constructor(port)
/// Construct a new DAC object.
///
/// `port` can be a pin object, or an integer (1 or 2).
/// DAC(1) is on pin X5 and DAC(2) is on pin X6.
STATIC mp_obj_t pyb_dac_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 1, 1, false);
// get pin/channel to output on
mp_int_t dac_id;
if (MP_OBJ_IS_INT(args[0])) {
dac_id = mp_obj_get_int(args[0]);
} else {
const pin_obj_t *pin = pin_find(args[0]);
if (pin == &pin_A4) {
dac_id = 1;
} else if (pin == &pin_A5) {
dac_id = 2;
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "pin %q does not have DAC capabilities", pin->name));
}
}
pyb_dac_obj_t *dac = m_new_obj(pyb_dac_obj_t);
dac->base.type = &pyb_dac_type;
uint32_t pin;
if (dac_id == 1) {
pin = GPIO_PIN_4;
dac->dac_channel = DAC_CHANNEL_1;
dac->dma_stream = DMA1_Stream5;
} else if (dac_id == 2) {
pin = GPIO_PIN_5;
dac->dac_channel = DAC_CHANNEL_2;
dac->dma_stream = DMA1_Stream6;
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "DAC %d does not exist", dac_id));
}
// GPIO configuration
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Pin = pin;
GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
GPIO_InitStructure.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);
// DAC peripheral clock
__DAC_CLK_ENABLE();
// stop anything already going on
HAL_DAC_Stop(&DAC_Handle, dac->dac_channel);
if ((dac->dac_channel == DAC_CHANNEL_1 && DAC_Handle.DMA_Handle1 != NULL)
|| (dac->dac_channel == DAC_CHANNEL_2 && DAC_Handle.DMA_Handle2 != NULL)) {
HAL_DAC_Stop_DMA(&DAC_Handle, dac->dac_channel);
}
dac->state = 0;
// return object
return dac;
}
int dacOutAdcIn(int dacValue, uint32_t adcChannel)
{
HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, dacValue);
HAL_Delay(DAC_OUT_TO_ADC_IN_DELAY); // ms
int adcValue = readAdcChannel(adcChannel);
HAL_DAC_Stop(&hdac, DAC_CHANNEL_1);
return adcValue;
}
/**
* @brief This function will stop the DAC
* @param port : the gpio port to use
* @param pin : the gpio pin to use
* @retval None
*/
void dac_stop(PinName pin)
{
DAC_HandleTypeDef DacHandle;
uint32_t dacChannel;
DacHandle.Instance = pinmap_peripheral(pin, PinMap_DAC);
if (DacHandle.Instance == NP) return;
dacChannel = get_dac_channel(pin);
if (!IS_DAC_CHANNEL(dacChannel)) return;
HAL_DAC_Stop(&DacHandle, dacChannel);
if (HAL_DAC_DeInit(&DacHandle) != HAL_OK)
{
/* DeInitialization Error */
return;
}
}
