/**
* \brief Initializes the TC subsystem ready to generate a LED PWM wave.
*
* Initializes the on-chip TC module in PWM generation mode, and configures the
* board LED as an output so that the LED brightness can be adjusted.
*/
static void pwm_timer_init(void)
{
// Assign output pin to timer/counter 0 channel B
gpio_enable_module_pin(AVR32_TC0_B0_0_0_PIN,
AVR32_TC0_B0_0_0_FUNCTION);
// Timer waveform options
const tc_waveform_opt_t waveform_options = {
//! Channel selection.
.channel = 0,
//! Software trigger effect on TIOB.
.bswtrg = TC_EVT_EFFECT_NOOP,
//! External event effect on TIOB.
.beevt = TC_EVT_EFFECT_NOOP,
//! RC compare effect on TIOB.
.bcpc = TC_EVT_EFFECT_CLEAR,
//! RB compare effect on TIOB.
.bcpb = TC_EVT_EFFECT_SET,
//! Software trigger effect on TIOA.
.aswtrg = TC_EVT_EFFECT_NOOP,
//! External event effect on TIOA.
.aeevt = TC_EVT_EFFECT_NOOP,
//! RC compare effect on TIOA.
.acpc = TC_EVT_EFFECT_NOOP,
//! RA compare effect on TIOA.
.acpa = TC_EVT_EFFECT_NOOP,
//! Waveform selection
.wavsel = TC_WAVEFORM_SEL_UP_MODE_RC_TRIGGER,
//! External event trigger enable.
.enetrg = false,
//! External event selection (non-zero for Channel B to work)
.eevt = !0,
//! External event edge selection.
.eevtedg = TC_SEL_NO_EDGE,
//! Counter disable when RC compare.
.cpcdis = false,
//! Counter clock stopped with RC compare.
.cpcstop = false,
//! Burst signal selection.
.burst = false,
//! Clock inversion selection.
.clki = false,
//! Internal source clock 5, fPBA/128.
.tcclks = TC_CLOCK_SOURCE_TC5,
};
// Setup timer/counter waveform mode
sysclk_enable_peripheral_clock(&AVR32_TC0);
tc_init_waveform(&AVR32_TC0, &waveform_options);
// Write the TOP (RC) and COMPARE (RB) values
tc_write_rb(&AVR32_TC0, 0, 1); // Set RB value.
tc_write_rc(&AVR32_TC0, 0, 255); // Set RC value.
// Start the timer PWM channel
tc_start(&AVR32_TC0, 0);
}
/**
* \brief Application main routine
*/
int main(void)
{
board_init();
sysclk_init();
irq_initialize_vectors();
cpu_irq_enable();
pwm_timer_init();
touch_init();
while (true) {
touch_handler();
}
}
/**
* \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));
}
}
