/**
* \brief Application entry point.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
uint8_t uc_key;
/* Initialize the SAM system. */
sysclk_init();
board_init();
configure_console();
/* Output example information. */
puts(STRING_HEADER);
g_afec0_sample_data = 0;
g_afec1_sample_data = 0;
g_max_digital = MAX_DIGITAL_12_BIT;
set_afec_test();
while (1) {
afec_start_software_conversion(AFEC0);
delay_ms(g_delay_cnt);
/* Check if the user enters a key. */
if (!uart_read(CONF_UART, &uc_key)) {
/* Disable all afec interrupt. */
afec_disable_interrupt(AFEC0, AFEC_INTERRUPT_ALL);
afec_disable_interrupt(AFEC1, AFEC_INTERRUPT_ALL);
tc_stop(TC0, 0);
set_afec_test();
}
}
}
// Module initialisation
void AnalogInInit()
{
#if SAM3XA || SAM4S
pmc_enable_periph_clk(ID_ADC);
adc_init(ADC, SystemCoreClock, 2000000, ADC_STARTUP_TIME_12); // 2MHz clock
adc_configure_timing(ADC, 3, ADC_SETTLING_TIME_3, 1); // Add transfer time
adc_configure_trigger(ADC, ADC_TRIG_SW, 0); // Disable hardware trigger
adc_disable_interrupt(ADC, 0xFFFFFFFF); // Disable all ADC interrupts
adc_disable_all_channel(ADC);
#elif SAM4E || SAME70
afec_enable(AFEC0);
afec_enable(AFEC1);
afec_config cfg;
afec_get_config_defaults(&cfg);
#if 0 // these are probably not needed, the defaults should be OK
// cfg.afec_clock = 2000000UL; // reduce clock frequency
// cfg.settling_time = AFEC_SETTLING_TIME_3;
#endif
while (afec_init(AFEC0, &cfg) != STATUS_OK)
{
(void)afec_get_latest_value(AFEC0);
}
while (afec_init(AFEC1, &cfg) != STATUS_OK)
{
(void)afec_get_latest_value(AFEC1);
}
afec_disable_interrupt(AFEC0, AFEC_INTERRUPT_ALL);
afec_disable_interrupt(AFEC1, AFEC_INTERRUPT_ALL);
afec_set_trigger(AFEC0, AFEC_TRIG_SW);
afec_set_trigger(AFEC1, AFEC_TRIG_SW);
#endif
}
/**
* \brief Application entry point.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
uint8_t uc_key;
/* Initialize the SAM system. */
sysclk_init();
board_init();
configure_console();
/* Output example information. */
puts(STRING_HEADER);
g_afec_sample_data.value = 0;
g_afec_sample_data.is_done = false;
g_max_digital = MAX_DIGITAL_12_BIT;
afec_enable(AFEC0);
struct afec_config afec_cfg;
afec_get_config_defaults(&afec_cfg);
afec_init(AFEC0, &afec_cfg);
struct afec_ch_config afec_ch_cfg;
afec_ch_get_config_defaults(&afec_ch_cfg);
afec_ch_set_config(AFEC0, AFEC_CHANNEL_POTENTIOMETER, &afec_ch_cfg);
/*
* Because the internal ADC offset is 0x800, it should cancel it and shift
* down to 0.
*/
afec_channel_set_analog_offset(AFEC0, AFEC_CHANNEL_POTENTIOMETER, 0x800);
afec_set_trigger(AFEC0, AFEC_TRIG_SW);
/* Enable channel for potentiometer. */
afec_channel_enable(AFEC0, AFEC_CHANNEL_POTENTIOMETER);
afec_set_callback(AFEC0, AFEC_INTERRUPT_DATA_READY, afec_data_ready, 1);
display_menu();
afec_start_calibration(AFEC0);
while((afec_get_interrupt_status(AFEC0) & AFEC_ISR_EOCAL) != AFEC_ISR_EOCAL);
while (1) {
afec_start_software_conversion(AFEC0);
delay_ms(1000);
/* Check if AFEC sample is done. */
if (g_afec_sample_data.is_done == true) {
printf("Potentiometer Voltage: %4d mv.",
(int)(g_afec_sample_data.value * VOLT_REF
/ g_max_digital));
puts("\r");
g_afec_sample_data.is_done = false;
}
/* Check if the user enters a key. */
if (!uart_read(CONF_UART, &uc_key)) {
/* Disable all afec interrupt. */
afec_disable_interrupt(AFEC0, AFEC_INTERRUPT_ALL);
set_afec_resolution();
afec_enable_interrupt(AFEC0, AFEC_INTERRUPT_DATA_READY);
}
}
}
/**
* \brief Callback function for AFEC conversion data is ready interrupt.
*/
static void afec_set_data_ready_flag(void)
{
is_data_ready = true;
afec_disable_interrupt(AFEC0, AFEC_INTERRUPT_DATA_READY);
tc_stop(TC0, 0);
}
/**
* \brief Callback function for AFEC enter compasion window interrupt.
*/
static void afec_set_comp_flag(void)
{
is_comp_event_flag = true;
afec_disable_interrupt(AFEC0, AFEC_INTERRUPT_COMP_ERROR);
}
