/** Display current information,including
* voltage on potentiometer, thresholds and comparison mode.
*/
static void display_info(void)
{
uint32_t ul_adc_value = adc_get_channel_value(ADC, ADC_CHANNEL_POTENTIOMETER);
float f_low_threshold = (float)gs_us_low_threshold * VOLT_REF / MAX_DIGITAL;
float f_high_threshold = (float)gs_us_high_threshold * VOLT_REF / MAX_DIGITAL;
uint32_t ul_low_threshold = f_to_int(f_low_threshold);
uint32_t ul_high_threshold = f_to_int(f_high_threshold);
printf("-I- Thresholds: %u mv - %u mv.\n\r", ul_low_threshold, ul_high_threshold);
printf("-I- Voltage on potentiometer: %u mv.\n\r",
(unsigned int)(ul_adc_value * VOLT_REF / MAX_DIGITAL));
printf("-I- Comparison mode is %u\n\r.",
(unsigned int)(ADC->ADC_EMR & ADC_EMR_CMPMODE_Msk));
}
/** Display current information,including
* voltage on division resistor, thresholds and window monitor mode.
*/
static void display_info(void)
{
uint32_t ul_adc_value = adc_get_last_conv_value(&g_adc_inst);
float f_low_threshold =
(float)gs_us_low_threshold * VOLT_REF / MAX_DIGITAL;
float f_high_threshold =
(float)gs_us_high_threshold * VOLT_REF / MAX_DIGITAL;
uint32_t ul_low_threshold = f_to_int(f_low_threshold);
uint32_t ul_high_threshold = f_to_int(f_high_threshold);
printf("-I- Thresholds: %u mv - %u mv.\n\r", ul_low_threshold,
ul_high_threshold);
printf("-I- Voltage on tested channel: %u mv.\n\r",
(unsigned int)(ul_adc_value * VOLT_REF / MAX_DIGITAL));
printf("-I- Comparison mode is %u\n\r.",
(unsigned int)(adc_get_wm_mode(&g_adc_inst)));
}
/**
* \brief Example entry point.
*
* Initialize ADC to 12-bit, enable channel "ADC_CHANNEL_POTENTIOMETER", then
* enable hardware trigger with TIOA0 every second. Finally, start conversion.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
uint8_t c_choice;
int16_t s_adc_value;
int16_t s_threshold = 0;
/* Initialize the SAM system. */
sysclk_init();
board_init();
configure_console();
/* Output example information. */
puts(STRING_HEADER);
/* Initialize threshold. */
gs_us_low_threshold = 0x0;
gs_us_high_threshold = MAX_DIGITAL;
/* Enable peripheral clock. */
pmc_enable_periph_clk(ID_ADC);
/* Initialize ADC. */
/* startup = 10: 640 periods of ADCClock
* for prescale = 4
* prescale: ADCClock = MCK / ( (PRESCAL+1) * 2 ) => 64MHz / ((4+1)*2) = 6.4MHz
* ADC clock = 6.4 MHz
*/
adc_init(ADC, sysclk_get_cpu_hz(), 6400000, 10);
#if SAM3S || SAM3XA || SAM4S
adc_configure_timing(ADC, 0, ADC_SETTLING_TIME_3, 1);
#elif SAM3N
adc_configure_timing(ADC, 0);
#endif
adc_check(ADC, sysclk_get_cpu_hz());
/* Hardware trigger TIOA0. */
adc_configure_trigger(ADC, ADC_TRIG_TIO_CH_0, 0);
/* Enable channels for x,y and z. */
adc_enable_channel(ADC, ADC_CHANNEL_POTENTIOMETER);
/* Configure TC. */
configure_tc0();
/* Channel 5 has to be compared. */
adc_set_comparison_channel(ADC, ADC_CHANNEL_POTENTIOMETER);
/* Compare mode, in the window. */
adc_set_comparison_mode(ADC, ADC_EMR_CMPMODE_IN);
/* Set up Threshold. */
adc_set_comparison_window(ADC, gs_us_high_threshold, gs_us_low_threshold);
/* Enable ADC interrupt. */
NVIC_EnableIRQ(ADC_IRQn);
/* Start TC0 and hardware trigger. */
tc_start(TC0, 0);
/* Display main menu. */
display_menu();
while (1) {
while (uart_read(CONSOLE_UART, &c_choice)) {
}
printf("%c\r\n", c_choice);
switch (c_choice) {
case '0':
s_adc_value = adc_get_channel_value(ADC,
ADC_CHANNEL_POTENTIOMETER);
printf("-I- Current voltage is %d mv, %d%% of ADVREF\n\r",
(s_adc_value * VOLT_REF / MAX_DIGITAL), (s_adc_value * 100 / MAX_DIGITAL));
break;
case '1':
puts("Low threshold is set to(mv):");
s_threshold = get_voltage();
puts("\r");
if (s_threshold >= 0) {
s_adc_value = s_threshold * MAX_DIGITAL /
VOLT_REF;
adc_set_comparison_window(ADC, s_adc_value,
gs_us_high_threshold);
/* Renew low threshold. */
gs_us_low_threshold = s_adc_value;
float f_low_threshold = (float)gs_us_low_threshold * VOLT_REF / MAX_DIGITAL;
uint32_t ul_low_threshold = f_to_int(f_low_threshold);
printf("Setting low threshold to %u mv (reg value to 0x%x ~%d%%)\n\r",
ul_low_threshold,
gs_us_low_threshold,
gs_us_low_threshold * 100 / MAX_DIGITAL);
}
break;
case '2':
puts("High threshold is set to(mv):");
s_threshold = get_voltage();
puts("\r");
if (s_threshold >= 0) {
s_adc_value = s_threshold * MAX_DIGITAL /
VOLT_REF;
adc_set_comparison_window(ADC, gs_us_low_threshold,
s_adc_value);
/* Renew high threshold. */
gs_us_high_threshold = s_adc_value;
float f_high_threshold = (float)gs_us_high_threshold * VOLT_REF / MAX_DIGITAL;
uint32_t ul_high_threshold = f_to_int(f_high_threshold);
printf("Setting high threshold to %u mv (reg value to 0x%x ~%d%%)\n\r",
ul_high_threshold,
gs_us_high_threshold,
gs_us_high_threshold * 100 / MAX_DIGITAL);
}
break;
case '3':
puts("-a. Below low threshold.\n\r"
"-b. Above high threshold.\n\r"
"-c. In the comparison window.\n\r"
"-d. Out of the comparison window.\n\r"
"-q. Quit the setting.\r");
c_choice = get_comparison_mode();
adc_set_comparison_mode(ADC, c_choice);
printf("Comparison mode is %c.\n\r", 'a' + c_choice);
break;
case 'm':
case 'M':
display_menu();
break;
case 'i':
case 'I':
display_info();
break;
case 's':
case 'S':
enter_asleep();
break;
}
puts("Press \'m\' or \'M\' to display the main menu again!\r");
}
}
/**
* \brief Example entry point.
*
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
uint8_t c_choice;
int16_t s_adc_value;
int16_t s_dac_value;
int16_t s_threshold = 0;
float f_dac_data;
uint32_t ul_dac_data;
/* Initialize the SAM system. */
sysclk_init();
board_init();
configure_console();
/* Output example information. */
puts(STRING_HEADER);
/* Initialize threshold. */
gs_us_low_threshold = 500;
gs_us_high_threshold = 2000;
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 = ADC_WM_MODE_3,
/* The equivalent voltage value is 500 * VOLT_REF / 4095 = 251mv. */
.low_threshold = gs_us_low_threshold,
/* The equivalent voltage value is 2000 * VOLT_REF / 4095 = 1002mv. */
.high_threshold = gs_us_high_threshold,
};
start_dac();
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);
}
adc_ch_set_config(&g_adc_inst, &adc_ch_cfg);
adc_configure_trigger(&g_adc_inst, ADC_TRIG_CON);
adc_configure_gain(&g_adc_inst, ADC_GAIN_1X);
adc_set_callback(&g_adc_inst, ADC_WINDOW_MONITOR, adcife_wm_handler,
ADCIFE_IRQn, 1);
/* Display main menu. */
display_menu();
while (1) {
scanf("%c", (char *)&c_choice);
printf("%c\r\n", c_choice);
switch (c_choice) {
case '0':
adc_disable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
printf("DAC output is set to(mv) from 0mv to %dmv: ",
(int32_t)VOLT_REF);
s_dac_value = get_voltage();
puts("\r");
f_dac_data = (float)s_dac_value * DACC_MAX_DATA / VDDANA;
ul_dac_data = f_to_int(f_dac_data);
if (s_dac_value >= 0) {
dacc_write_conversion_data(DACC, ul_dac_data);
}
delay_ms(100);
adc_clear_status(&g_adc_inst, ADCIFE_SCR_WM);
adc_enable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
break;
case '1':
adc_disable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
printf("Low threshold is set to(mv) from 0mv to %dmv: ",
(int32_t)VOLT_REF);
s_threshold = get_voltage();
puts("\r");
if (s_threshold >= 0) {
s_adc_value = s_threshold * MAX_DIGITAL /
VOLT_REF;
adc_configure_wm_threshold(&g_adc_inst,
s_adc_value,
gs_us_high_threshold);
/* Renew low threshold. */
gs_us_low_threshold = s_adc_value;
float f_low_threshold =
(float)gs_us_low_threshold *
VOLT_REF / MAX_DIGITAL;
uint32_t ul_low_threshold =
f_to_int(f_low_threshold);
printf("Setting low threshold to %u mv (reg value to 0x%x ~%d%%)\n\r",
ul_low_threshold, gs_us_low_threshold,
gs_us_low_threshold * 100 / MAX_DIGITAL);
}
adc_clear_status(&g_adc_inst, ADCIFE_SCR_WM);
adc_enable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
break;
case '2':
adc_disable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
printf("High threshold is set to(mv)from 0mv to %dmv:",
(int32_t)VOLT_REF);
s_threshold = get_voltage();
puts("\r");
if (s_threshold >= 0) {
s_adc_value = s_threshold * MAX_DIGITAL /
VOLT_REF;
adc_configure_wm_threshold(&g_adc_inst,
gs_us_low_threshold,
s_adc_value);
/* Renew high threshold. */
gs_us_high_threshold = s_adc_value;
float f_high_threshold =
(float)gs_us_high_threshold *
VOLT_REF / MAX_DIGITAL;
uint32_t ul_high_threshold =
f_to_int(f_high_threshold);
printf("Setting high threshold to %u mv (reg value to 0x%x ~%d%%)\n\r",
ul_high_threshold, gs_us_high_threshold,
gs_us_high_threshold * 100 / MAX_DIGITAL);
}
adc_clear_status(&g_adc_inst, ADCIFE_SCR_WM);
adc_enable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
break;
case '3':
adc_disable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
puts("-a. Above low threshold.\n\r"
"-b. Below high threshold.\n\r"
"-c. In the comparison window.\n\r"
"-d. Out of the comparison window.\n\r"
"-q. Quit the setting.\r");
c_choice = get_wm_mode();
adc_configure_wm_mode(&g_adc_inst, c_choice);
printf("Comparison mode is %c.\n\r", 'a' + c_choice - 1);
adc_clear_status(&g_adc_inst, ADCIFE_SCR_WM);
adc_enable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
break;
case 'm':
display_menu();
break;
case 'i':
display_info();
adc_clear_status(&g_adc_inst, ADCIFE_SCR_WM);
adc_enable_interrupt(&g_adc_inst, ADC_WINDOW_MONITOR);
break;
}
puts("Press \'m\' or \'M\' to display the main menu again!\r");
}
}
