void config_dacc(void){
sysclk_enable_peripheral_clock(ID_DACC);
/* Reset DACC registers */
dacc_reset(DACC);
/* Half-Word transfer mode */
dacc_set_transfer_mode(DACC, 0);
/* Timing:
* startup - 0x10 (17 clocks)
* internal trigger clock - 0x60 (96 clocks)
*/
dacc_set_timing(DACC, 0x10, 0x60);
/*External trigger mode disabled. DACC in free running mode.*/
dacc_disable_trigger(DACC);
/* Enable DAC */
dacc_enable(DACC);
while((dacc_get_interrupt_status(DACC) & DACC_ISR_TXRDY) != DACC_ISR_TXRDY);
dacc_write_conversion_data(DACC, 0);
}
/**
* \brief Start DAC ouput.
* Initialize DAC, set clock and timing, and set DAC to given mode.
*/
static void start_dac(void)
{
sysclk_enable_peripheral_clock(DACC);
/* Reset DACC registers */
dacc_reset(DACC);
/* Half word transfer mode */
dacc_set_transfer_mode(DACC, 0);
/* Timing:
* startup - 0x10 (17 clocks)
* internal trigger clock - 0x60 (96 clocks)
*/
dacc_set_timing(DACC, 0x10, 0x60);
/* Enable DAC */
dacc_enable(DACC);
/* The DAC is 10-bit resolution, so output voltage should be
* (3300 * 255) / ((1 << 10) - 1) = 823mv */
dacc_write_conversion_data(DACC, 0xFF);
}
/**
* Initialize the DAC as event user.
*/
static void init_dacc(void)
{
/* Enable clock for DACC */
sysclk_enable_peripheral_clock(DACC);
/* Reset DACC registers */
dacc_reset(DACC);
/* Half word transfer mode */
dacc_set_transfer_mode(DACC, 0);
/*
* Timing:
* startup - 0x10 (17 clocks)
* internal trigger clock - 0x60 (96 clocks)
*/
dacc_set_timing(DACC, 0x10, 0x60);
/* Enable event trigger (0: external trigger, 1: peripheral event) */
dacc_set_trigger(DACC, 1);
/* Enable DAC */
dacc_enable(DACC);
}
/**
* \brief Start ADC sample.
* Initialize ADC, set clock and timing, and set ADC to given mode.
*/
static void start_adc(void)
{
struct adc_config adc_cfg = {
/* System clock division factor is 16 */
.prescal = ADC_PRESCAL_DIV16,
/* The APB clock is used */
.clksel = ADC_CLKSEL_APBCLK,
/* Max speed is 150K */
.speed = ADC_SPEED_150K,
/* ADC Reference voltage is 0.625*VCC */
.refsel = ADC_REFSEL_1,
/* Enables the Startup time */
.start_up = CONFIG_ADC_STARTUP
};
struct adc_seq_config adc_seq_cfg = {
/* Select Vref for shift cycle */
.zoomrange = ADC_ZOOMRANGE_0,
/* Pad Ground */
.muxneg = ADC_MUXNEG_1,
/* DAC internal */
.muxpos = ADC_MUXPOS_3,
/* Enables the internal voltage sources */
.internal = ADC_INTERNAL_3,
/* Disables the ADC gain error reduction */
.gcomp = ADC_GCOMP_DIS,
/* Disables the HWLA mode */
.hwla = ADC_HWLA_DIS,
/* 12-bits resolution */
.res = ADC_RES_12_BIT,
/* Enables the single-ended mode */
.bipolar = ADC_BIPOLAR_SINGLEENDED
};
struct adc_ch_config adc_ch_cfg = {
.seq_cfg = &adc_seq_cfg,
/* Internal Timer Max Counter */
.internal_timer_max_count = 60,
/* Window monitor mode is off */
.window_mode = 0,
.low_threshold = 0,
.high_threshold = 0,
};
if(adc_init(&g_adc_inst, ADCIFE, &adc_cfg) != STATUS_OK) {
puts("-F- ADC Init Fail!\n\r");
while(1);
}
if(adc_enable(&g_adc_inst) != STATUS_OK) {
puts("-F- ADC Enable Fail!\n\r");
while(1);
}
if (g_adc_test_mode.uc_pdc_en) {
adc_disable_interrupt(&g_adc_inst, ADC_SEQ_SEOC);
adc_pdca_set_config(&g_adc_pdca_cfg);
pdca_channel_set_callback(CONFIG_ADC_PDCA_RX_CHANNEL, pdca_transfer_done,
PDCA_0_IRQn, 1, PDCA_IER_TRC);
} else {
pdca_channel_disable_interrupt(CONFIG_ADC_PDCA_RX_CHANNEL,
PDCA_IDR_TRC);
pdca_channel_disable_interrupt(CONFIG_ADC_PDCA_TX_CHANNEL,
PDCA_IDR_TRC);
adc_ch_set_config(&g_adc_inst, &adc_ch_cfg);
adc_set_callback(&g_adc_inst, ADC_SEQ_SEOC, adcife_read_conv_result,
ADCIFE_IRQn, 1);
}
/* Configure trigger mode and start convention. */
switch (g_adc_test_mode.uc_trigger_mode) {
case TRIGGER_MODE_SOFTWARE:
adc_configure_trigger(&g_adc_inst, ADC_TRIG_SW);
break;
case TRIGGER_MODE_CON:
adc_configure_trigger(&g_adc_inst, ADC_TRIG_CON);
break;
case TRIGGER_MODE_ITIMER:
adc_configure_trigger(&g_adc_inst, ADC_TRIG_INTL_TIMER);
adc_configure_itimer_period(&g_adc_inst,
adc_ch_cfg.internal_timer_max_count);
adc_start_itimer(&g_adc_inst);
break;
default:
break;
}
if (g_adc_test_mode.uc_gain_en) {
adc_configure_gain(&g_adc_inst, ADC_GAIN_2X);
} else {
adc_configure_gain(&g_adc_inst, ADC_GAIN_1X);
}
}
/**
* \brief Start DAC ouput.
* Initialize DAC, set clock and timing, and set DAC to given mode.
*/
static void start_dac(void)
{
sysclk_enable_peripheral_clock(DACC);
/* Reset DACC registers */
dacc_reset(DACC);
/* Half word transfer mode */
dacc_set_transfer_mode(DACC, 0);
/* Timing:
* startup - 0x10 (17 clocks)
* internal trigger clock - 0x60 (96 clocks)
*/
dacc_set_timing(DACC, 0x10, 0x60);
/* Enable DAC */
dacc_enable(DACC);
/* The DAC is 10-bit resolution, so output voltage should be
* (3300 * 255) / ((1 << 10) - 1) = 823mv */
dacc_write_conversion_data(DACC, 0xFF);
}
/**
* \brief DAC Sinewave application entry point.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
uint8_t uc_key;
uint32_t ul_freq, ul_amp;
/* Initialize the system */
sysclk_init();
board_init();
/* Initialize debug console */
configure_console();
/* Output example information */
puts(STRING_HEADER);
/* Enable clock for DACC */
#if SAM4L
sysclk_enable_peripheral_clock(DACC_BASE);
#else
sysclk_enable_peripheral_clock(DACC_ID);
#endif
/* Reset DACC registers */
dacc_reset(DACC_BASE);
/* Half word transfer mode */
dacc_set_transfer_mode(DACC_BASE, 0);
/* Initialize timing, amplitude and frequency */
#if (SAM3N) || (SAM4L)
/* Timing:
* startup - 0x10 (17 clocks)
* internal trigger clock - 0x60 (96 clocks)
*/
dacc_set_timing(DACC_BASE, 0x10, 0x60);
/* Enable DAC */
dacc_enable(DACC_BASE);
#else
/* Power save:
* sleep mode - 0 (disabled)
* fast wakeup - 0 (disabled)
*/
dacc_set_power_save(DACC_BASE, 0, 0);
/* Timing:
* refresh - 0x08 (1024*8 dacc clocks)
* max speed mode - 0 (disabled)
* startup time - 0x10 (1024 dacc clocks)
*/
dacc_set_timing(DACC_BASE, 0x08, 0, 0x10);
/* Disable TAG and select output channel DACC_CHANNEL */
dacc_set_channel_selection(DACC_BASE, DACC_CHANNEL);
/* Enable output channel DACC_CHANNEL */
dacc_enable_channel(DACC_BASE, DACC_CHANNEL);
/* Set up analog current */
dacc_set_analog_control(DACC_BASE, DACC_ANALOG_CONTROL);
#endif /* (SAM3N) */
g_l_amplitude = MAX_AMPLITUDE / 2;
g_ul_frequency = DEFAULT_FREQUENCY;
SysTick_Config(sysclk_get_cpu_hz() / (g_ul_frequency * SAMPLES));
/* Main menu */
display_menu();
while (1) {
usart_serial_getchar((Usart *)CONSOLE_UART, &uc_key);
switch (uc_key) {
case '0':
puts("Frequency:");
ul_freq = get_input_value(MIN_FREQUENCY, MAX_FREQUENCY);
puts("\r");
if (ul_freq != VAL_INVALID) {
printf("Set frequency to : %luHz\n\r", (unsigned long)ul_freq);
SysTick_Config(sysclk_get_cpu_hz() / (ul_freq * SAMPLES));
g_ul_frequency = ul_freq;
}
break;
case '1':
puts("Amplitude:");
ul_amp = get_input_value(MIN_AMPLITUDE, MAX_AMPLITUDE);
puts("\r");
if (ul_amp != VAL_INVALID) {
printf("Set amplitude to : %lu\n\r", (unsigned long)ul_amp);
g_l_amplitude = ul_amp;
}
break;
case 'i':
case 'I':
printf("-I- Frequency : %lu Hz Amplitude : %ld\n\r",
(unsigned long)g_ul_frequency, (long)g_l_amplitude);
break;
case 'w':
case 'W':
printf("-I- Switch wave to : %s\n\r", g_uc_wave_sel ?
"SINE" : "Full Amplitude SQUARE");
g_uc_wave_sel = (g_uc_wave_sel + 1) & 1;
break;
case 'm':
case 'M':
display_menu();
break;
}
puts("Press \'m\' or \'M\' to display the main menu again!\r");
}
}