OSStatus platform_adc_init( const platform_adc_t* adc, uint32_t sample_cycle )
{
OSStatus err = kNoErr;
struct adc_config adc_cfg;
UNUSED_PARAMETER(sample_cycle);
platform_mcu_powersave_disable();
require_action_quiet( adc != NULL, exit, err = kParamErr);
if( initialized != true )
{
adc_enable();
adc_select_clock_source_mck(ADC);
adc_get_config_defaults(&adc_cfg);
adc_init(ADC, &adc_cfg);
adc_set_trigger(ADC, ADC_TRIG_SW);
adc_set_resolution(ADC, adc->resolution);
initialized = true;
}
exit:
platform_mcu_powersave_enable();
return err;
}
/**
* \brief Application entry point.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
int32_t ul_vol;
int32_t ul_temp;
/* Initialize the SAM system. */
sysclk_init();
board_init();
configure_console();
/* Output example information. */
puts(STRING_HEADER);
adc_enable();
struct adc_config adc_cfg;
adc_get_config_defaults(&adc_cfg);
adc_init(ADC, &adc_cfg);
adc_channel_enable(ADC,ADC_TEMPERATURE_SENSOR);
adc_set_trigger(ADC, ADC_TRIG_SW);
struct adc_temp_sensor_config adc_temp_sensor_cfg;
adc_temp_sensor_get_config_defaults(&adc_temp_sensor_cfg);
adc_temp_sensor_set_config(ADC, &adc_temp_sensor_cfg);
adc_set_callback(ADC, ADC_INTERRUPT_EOC_16,
adc_temp_sensor_end_conversion, 1);
adc_start_software_conversion(ADC);
while (1) {
if (is_conversion_done == true) {
is_conversion_done = false;
ul_vol = g_ul_value * VOLT_REF / MAX_DIGITAL;
/*
* According to datasheet, The output voltage VT = 1.44V at 27C
* and the temperature slope dVT/dT = 4.7 mV/C
*/
ul_temp = (ul_vol - 1440) * 100 / 470 + 27;
printf("-- Temperature is: %4d\r\n", (int)ul_temp);
delay_ms(1000);
adc_start_software_conversion(ADC);
}
}
}
/**
* \brief Configure the ADC for the light sensor.
*/
static void configure_adc(void)
{
struct adc_config adc_cfg;
/* Configure ADC pin for light sensor. */
gpio_configure_pin(LIGHT_SENSOR_GPIO, LIGHT_SENSOR_FLAGS);
/* Enable ADC clock. */
pmc_enable_periph_clk(ID_ADC);
/* Configure ADC. */
adc_enable();
adc_get_config_defaults(&adc_cfg);
adc_init(ADC, &adc_cfg);
adc_channel_enable(ADC, ADC_CHANNEL_0);
adc_set_trigger(ADC, ADC_TRIG_SW);
}
/**
* \brief Application entry point.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
int32_t ul_vol;
/* Initialize the SAM system. */
sysclk_init();
board_init();
configure_console();
/* Output example information. */
puts(STRING_HEADER);
adc_enable();
struct adc_config adc_cfg;
adc_get_config_defaults(&adc_cfg);
adc_init(ADC, &adc_cfg);
adc_channel_enable(ADC, ADC_CHANNEL_11);
adc_set_trigger(ADC, ADC_TRIG_TIO_CH_0);
adc_set_callback(ADC, ADC_INTERRUPT_EOC_11,
adc_end_conversion, 1);
set_adc_resolution();
adc_start_calibration(ADC);
/* Configure TC */
configure_tc_trigger();
while (1) {
/* Check if ADC sample is done. */
if (is_conversion_done == true) {
ul_vol = g_ul_value * VOLT_REF / g_max_digital;
printf("-- Voltage is: %4dmv\r\n", (int)ul_vol);
is_conversion_done = false;
}
}
}
/**
* \brief (Re)Sart ADC sample.
* Initialize ADC, set clock and timing, set ADC to given mode.
*/
static void _configure_adc(void)
{
uint8_t i = 0;
/* Check if sequence mode is necessary */
_test_mode.sequence_enabled = 0;
for(i = 0; i < NUM_CHANNELS; i++) {
if(i != adc_channel_used[i]) {
_test_mode.sequence_enabled = 1;
break;
}
}
/* Update channel number */
for (i = 0; i < NUM_CHANNELS; i++) {
_data.channel[i] = adc_channel_used[i];
}
/* Enable/disable sequencer */
if (_test_mode.sequence_enabled) {
/* Set user defined channel sequence */
adc_set_sequence_by_list(adc_channel_used, NUM_CHANNELS);
/* Enable sequencer */
adc_set_sequence_mode(true);
} else {
/* Disable sequencer */
adc_set_sequence_mode(false);
}
/* Enable channels, gain, single mode */
for (i = 0; i < NUM_CHANNELS; i++) {
adc_enable_channel(_data.channel[i]);
}
/* Set power save */
if (_test_mode.power_save_enabled) {
adc_set_sleep_mode(true);
} else {
adc_set_sleep_mode(false);
}
/* Transfer with/without DMA */
/* Initialize XDMA driver instance with polling mode */
/* Enable Data ready interrupt */
uint32_t ier_mask = 0;
for (i = 0; i < NUM_CHANNELS; i++) {
ier_mask |= 0x1u << _data.channel[i];
}
adc_enable_it(ier_mask) ;
/* Set ADC irq handler */
aic_set_source_vector(ID_ADC, adc_irq_handler);
/* Configure trigger mode and start convention */
switch (_test_mode.trigger_mode) {
case TRIGGER_MODE_SOFTWARE:
/* Disable hardware trigger */
adc_set_trigger(0);
/* No trigger, only software trigger can start conversions */
adc_set_trigger_mode(ADC_TRGR_TRGMOD_NO_TRIGGER);
aic_enable(ID_ADC);
break;
case TRIGGER_MODE_ADTRG:
pio_configure(pin_adtrg, ARRAY_SIZE(pin_adtrg));
break;
case TRIGGER_MODE_TIMER :
/* Enable hardware trigger */
adc_set_trigger(ADC_MR_TRGSEL_ADC_TRIG1);
/* Trigger timer*/
adc_set_trigger_mode(ADC_TRGR_TRGMOD_PERIOD_TRIG);
adc_set_trigger_period(250);
aic_enable(ID_TC0);
break;
default :
break;
}
}
