SAM4S2A ADC

ASF Wizard

  • ADC - Analog-to-digital Converter (driver): The Analog to Digital Converter is able to capture analog signals and transform them into digital format with 10-bit or 12-bit resolution.

Enum

/* The max ADC clock freq definition*/
#define ADC_FREQ_MAX 20000000
/* The min ADC clock freq definition*/
#define ADC_FREQ_MIN 1000000
/* The normal ADC startup time*/
#define ADC_STARTUP_NORM 40
/* The fast ADC startup time*/
#define ADC_STARTUP_FAST 12
/* Definitions for ADC resolution */
enum adc_resolution_t {
ADC_10_BITS = ADC_MR_LOWRES_BITS_10, /* ADC 10-bit resolution */
ADC_12_BITS = ADC_MR_LOWRES_BITS_12 /* ADC 12-bit resolution */
};
/* Definitions for ADC trigger */
enum adc_trigger_t {
/* Starting a conversion is only possible by software. */
ADC_TRIG_SW = ADC_MR_TRGEN_DIS,
/* External trigger */
ADC_TRIG_EXT = ADC_MR_TRGSEL_ADC_TRIG0 | ADC_MR_TRGEN,
/* TIO Output of the Timer Counter Channel 0 */
ADC_TRIG_TIO_CH_0 = ADC_MR_TRGSEL_ADC_TRIG1 | ADC_MR_TRGEN,
/* TIO Output of the Timer Counter Channel 1 */
ADC_TRIG_TIO_CH_1 = ADC_MR_TRGSEL_ADC_TRIG2 | ADC_MR_TRGEN,
/* TIO Output of the Timer Counter Channel 2 */
ADC_TRIG_TIO_CH_2 = ADC_MR_TRGSEL_ADC_TRIG3 | ADC_MR_TRGEN,
/* PWM Event Line 0 */
ADC_TRIG_PWM_EVENT_LINE_0 = ADC_MR_TRGSEL_ADC_TRIG4 | ADC_MR_TRGEN,
/* PWM Event Line 1 */
ADC_TRIG_PWM_EVENT_LINE_1 = ADC_MR_TRGSEL_ADC_TRIG5 | ADC_MR_TRGEN
};
/* Definitions for ADC channel number */
enum adc_channel_num_t {
ADC_CHANNEL_0 = 0,
ADC_CHANNEL_1 = 1,
ADC_CHANNEL_2 = 2,
ADC_CHANNEL_3 = 3,
ADC_CHANNEL_4 = 4,
ADC_CHANNEL_5 = 5,
ADC_CHANNEL_6 = 6,
ADC_CHANNEL_7 = 7,
ADC_CHANNEL_8 = 8,
ADC_CHANNEL_9 = 9,
ADC_CHANNEL_10 = 10,
ADC_CHANNEL_11 = 11,
ADC_CHANNEL_12 = 12,
ADC_CHANNEL_13 = 13,
ADC_CHANNEL_14 = 14,
ADC_TEMPERATURE_SENSOR = 15,
};
/* Definitions for ADC gain value */
enum adc_gainvalue_t {
ADC_GAINVALUE_0 = 0,
ADC_GAINVALUE_1 = 1,
ADC_GAINVALUE_2 = 2,
ADC_GAINVALUE_3 = 3
};
/* Definitions for ADC analog settling time */
enum adc_settling_time_t {
ADC_SETTLING_TIME_0 = ADC_MR_SETTLING_AST3,
ADC_SETTLING_TIME_1 = ADC_MR_SETTLING_AST5,
ADC_SETTLING_TIME_2 = ADC_MR_SETTLING_AST9,
ADC_SETTLING_TIME_3 = ADC_MR_SETTLING_AST17
};
/** Definitions for ADC Start Up Time */
enum adc_startup_time {
ADC_STARTUP_TIME_0 = ADC_MR_STARTUP_SUT0,
ADC_STARTUP_TIME_1 = ADC_MR_STARTUP_SUT8,
ADC_STARTUP_TIME_2 = ADC_MR_STARTUP_SUT16,
ADC_STARTUP_TIME_3 = ADC_MR_STARTUP_SUT24,
ADC_STARTUP_TIME_4 = ADC_MR_STARTUP_SUT64,
ADC_STARTUP_TIME_5 = ADC_MR_STARTUP_SUT80,
ADC_STARTUP_TIME_6 = ADC_MR_STARTUP_SUT96,
ADC_STARTUP_TIME_7 = ADC_MR_STARTUP_SUT112,
ADC_STARTUP_TIME_8 = ADC_MR_STARTUP_SUT512,
ADC_STARTUP_TIME_9 = ADC_MR_STARTUP_SUT576,
ADC_STARTUP_TIME_10 = ADC_MR_STARTUP_SUT640,
ADC_STARTUP_TIME_11 = ADC_MR_STARTUP_SUT704,
ADC_STARTUP_TIME_12 = ADC_MR_STARTUP_SUT768,
ADC_STARTUP_TIME_13 = ADC_MR_STARTUP_SUT832,
ADC_STARTUP_TIME_14 = ADC_MR_STARTUP_SUT896,
ADC_STARTUP_TIME_15 = ADC_MR_STARTUP_SUT960
};

Examples

#include "conf_uart_serial.h"
#include <asf.h>
void serial_init(void) {
pio_configure(
PINS_USART0_PIO, PINS_USART0_TYPE, PINS_USART0_MASK, PINS_USART0_ATTR);
pmc_enable_periph_clk(USART_SERIAL_ID);
sysclk_enable_peripheral_clock(USART_SERIAL_ID);
const usart_serial_options_t usart_serial_options
= {.baudrate = USART_SERIAL_BAUDRATE,
.charlength = USART_SERIAL_CHAR_LENGTH,
.paritytype = USART_SERIAL_PARITY,
.stopbits = USART_SERIAL_STOP_BIT};
stdio_serial_init(USART_SERIAL, &usart_serial_options);
}
void adc_setup(void) {
pmc_enable_periph_clk(ID_ADC);
adc_init(ADC, F_CPU, 6400000, ADC_STARTUP_TIME_8);
adc_configure_timing(ADC, 0, ADC_SETTLING_TIME_3, 1);
adc_set_resolution(ADC, ADC_MR_LOWRES_BITS_10);
// print
adc_check(ADC, F_CPU);
adc_disable_all_channel(ADC);
adc_enable_channel(ADC, ADC_CHANNEL_0);
adc_enable_channel(ADC, ADC_CHANNEL_2);
adc_configure_trigger(ADC, ADC_TRIG_SW, 0);
adc_start(ADC);
}
int main(void) {
sysclk_init();
board_init();
/* Insert application code here, after the board has been initialized. */
wdt_disable(WDT);
serial_init();
adc_setup();
for(;;) {
if(adc_get_channel_status(ADC, ADC_CHANNEL_0)
&& adc_get_channel_status(ADC, ADC_CHANNEL_2)) {
printf("%d,%d\n",
adc_get_channel_value(ADC, ADC_CHANNEL_0),
adc_get_channel_value(ADC, ADC_CHANNEL_2));
adc_start(ADC);
}
}
}
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