/**
* \brief Initialize ADC driver to read the board temperature sensor.
*
* Initializes the board's ADC driver module and configures the ADC channel
* connected to the onboard NTC temperature sensor ready for conversions.
*/
static void init_adc(void)
{
// Assign and enable GPIO pin to the ADC function.
gpio_enable_module_pin(ADC_TEMPERATURE_PIN, ADC_TEMPERATURE_FUNCTION);
const adcifb_opt_t adcifb_opt = {
.resolution = AVR32_ADCIFB_ACR_RES_12BIT,
.shtim = 15,
.ratio_clkadcifb_clkadc = 2,
.startup = 3,
.sleep_mode_enable = false
};
// Enable and configure the ADCIFB module
sysclk_enable_peripheral_clock(&AVR32_ADCIFB);
adcifb_configure(&AVR32_ADCIFB, &adcifb_opt);
// Configure the trigger (No trigger, only software trigger)
adcifb_configure_trigger(&AVR32_ADCIFB, AVR32_ADCIFB_TRGMOD_NT, 0);
// Enable the ADCIFB channel to NTC temperature sensor
adcifb_channels_enable(&AVR32_ADCIFB, ADC_TEMPERATURE_CHANNEL);
}
/**
* \brief Initializes the USART.
*
* Initializes the board USART ready for serial data to be transmitted and
* received.
*/
static void init_usart(void)
{
const usart_options_t usart_options = {
.baudrate = 57600,
.charlength = 8,
.paritytype = USART_NO_PARITY,
.stopbits = USART_1_STOPBIT,
.channelmode = USART_NORMAL_CHMODE
};
// Initialize USART in RS232 mode with the requested settings.
sysclk_enable_peripheral_clock(USART);
usart_init_rs232(USART, &usart_options, sysclk_get_pba_hz());
}
/**
* \brief Initializes the PWM subsystem ready to generate the RGB LED PWM
* waves.
*
* Initializes the on-chip PWM module and configures the RGB LED PWM outputs so
* the the brightness of the three individual channels can be adjusted.
*/
static void init_pwm(void)
{
// GPIO pin/function map for the RGB LEDs.
gpio_enable_module_pin(LED_RED_PWMA, LED_PWMA_FUNCTION);
gpio_enable_module_pin(LED_GREEN_PWMA, LED_PWMA_FUNCTION);
gpio_enable_module_pin(LED_BLUE_PWMA, LED_PWMA_FUNCTION);
const scif_gclk_opt_t genclk3_opt = {
.clock_source = SCIF_GCCTRL_CPUCLOCK,
.divider = 8,
.diven = true,
};
// Start generic clock 3 for the PWM outputs.
scif_start_gclk(AVR32_PM_GCLK_GCLK3, &genclk3_opt);
// Enable RGB LED PWM.
sysclk_enable_peripheral_clock(&AVR32_PWMA);
pwma_config_enable(&AVR32_PWMA,EXAMPLE_PWMA_FREQUENCY,EXAMPLE_PWMA_GCLK_FREQUENCY,0);
pwma_set_channels_value(&AVR32_PWMA,PWM_CHANNEL_RED | PWM_CHANNEL_BLUE| PWM_CHANNEL_GREEN,255);
}
/**
* \brief Application main loop.
*/
int main(void)
{
board_init();
sysclk_init();
sysclk_enable_peripheral_clock(USART);
// Initialize touch, ADC, USART and PWM
init_adc();
init_usart();
init_pwm();
init_touch();
while (true) {
uint32_t adc_data;
// Read slider and button and update RGB led
touch_handler();
// Wait until the ADC is ready to perform a conversion.
do { } while (!adcifb_is_ready(&AVR32_ADCIFB));
// Start an ADCIFB conversion sequence.
adcifb_start_conversion_sequence(&AVR32_ADCIFB);
// Wait until the converted data is available.
do { } while (!adcifb_is_drdy(&AVR32_ADCIFB));
// Get the last converted data.
adc_data = (adcifb_get_last_data(&AVR32_ADCIFB) & 0x3FF);
// Write temperature data to USART
do { } while (!usart_tx_empty(USART));
usart_write_char(USART, (adc_data >> 8));
do { } while (!usart_tx_empty(USART));
usart_write_char(USART, (adc_data & 0xFF));
}
}
/** \brief Main function - init and loop to display ADC values */
int main(void)
{
/* GPIO pin/ADC-function map. */
const gpio_map_t ADCIFB_GPIO_MAP = {
{EXAMPLE_ADCIFB_PIN, EXAMPLE_ADCIFB_FUNCTION}
};
/* ADCIFB Configuration */
adcifb_opt_t adcifb_opt = {
/* Resolution mode */
.resolution = AVR32_ADCIFB_ACR_RES_12BIT,
/* Channels Sample & Hold Time in [0,15] */
.shtim = 15,
.ratio_clkadcifb_clkadc =
(sysclk_get_pba_hz() / EXAMPLE_TARGET_CLK_ADC_FREQ_HZ),
/*
* Startup time in [0,127], where
* Tstartup = startup * 8 * Tclk_adc (assuming Tstartup ~ 15us max)
*/
.startup = 3,
/* ADCIFB Sleep Mode disabled */
.sleep_mode_enable = false
};
uint32_t adc_data;
/* Initialize the system clocks */
sysclk_init();
/* Init debug serial line */
init_dbg_rs232(sysclk_get_pba_hz());
/* Assign and enable GPIO pins to the ADC function. */
gpio_enable_module(ADCIFB_GPIO_MAP,
sizeof(ADCIFB_GPIO_MAP) / sizeof(ADCIFB_GPIO_MAP[0]));
/* Enable and configure the ADCIFB module */
if (adcifb_configure(&AVR32_ADCIFB, &adcifb_opt) != PASS) {
/* Config error. */
while (true) {
gpio_tgl_gpio_pin(LED0_GPIO);
delay_ms(100);
}
}
/* Configure the trigger mode */
/* "No trigger, only software trigger can start conversions". */
if (adcifb_configure_trigger(&AVR32_ADCIFB, AVR32_ADCIFB_TRGMOD_NT, 0)
!= PASS) {
/* Config error. */
while (true) {
gpio_tgl_gpio_pin(LED1_GPIO);
delay_ms(100);
}
}
/* Enable the ADCIFB channel the battery is connected to. */
adcifb_channels_enable(&AVR32_ADCIFB, EXAMPLE_ADCIFB_CHANNEL_MASK);
while (true) {
while (adcifb_is_ready(&AVR32_ADCIFB) != true) {
/* Wait until the ADC is ready to perform a conversion. */
}
/* Start an ADCIFB conversion sequence. */
adcifb_start_conversion_sequence(&AVR32_ADCIFB);
while (adcifb_is_drdy(&AVR32_ADCIFB) != true) {
/* Wait until the converted data is available. */
}
/* Get the last converted data. */
adc_data = adcifb_get_last_data(&AVR32_ADCIFB);
/* Display the current voltage of the battery. */
print_dbg("\x1B[2J\x1B[H\r\nADCIFB Example\r\nHEX Value for "
EXAMPLE_ADCIFB_CHANNEL_NAME " : 0x");
print_dbg_hex(adc_data & AVR32_ADCIFB_LCDR_LDATA_MASK);
print_dbg("\r\n");
delay_ms(500);
/*
* Note1: there is a resistor bridge between the battery and the
* ADC pad on the AT32UC3L-EK. The data converted is thus half
* of
* the battery voltage.
*/
/*
* Note2: if the battery is not in place, the conversion is out
* of
* spec because the ADC input is then higher than ADVREF.
*/
}
}
//#####################################################
void adc_start_conversion(void)
{
return adcifb_start_conversion_sequence(&AVR32_ADCIFB);
}
