pwm_led_example.c File Reference

PWM LED example for SAM.

Copyright (c) 2011-2018 Microchip Technology Inc. and its subsidiaries.

#include "asf.h"
#include "stdio_serial.h"
#include "conf_board.h"
#include "conf_clock.h"

Macros
#define	INIT_DUTY_VALUE   0
	Initial duty cycle value. More...
#define	PERIOD_VALUE   100
	Period value of PWM output waveform. More...
#define	PWM_FREQUENCY   1000
	PWM frequency in Hz. More...
#define	STRING_EOL   "\r"
#define	STRING_HEADER

Functions
static void	configure_console (void)
	Configure the Console UART. More...
int	main (void)
	Application entry point for PWM with LED example. More...
void	PWM0_Handler (void)
	Interrupt handler for the PWM controller. More...

Variables
pwm_channel_t	g_pwm_channel_led
	PWM channel instance for LEDs. More...

#define INIT_DUTY_VALUE   0

Initial duty cycle value.

Referenced by main(), and PWM0_Handler().

#define PERIOD_VALUE   100

Period value of PWM output waveform.

Referenced by main(), and PWM0_Handler().

#define PWM_FREQUENCY   1000

PWM frequency in Hz.

Referenced by main(), and PWM0_Handler().

#define STRING_EOL   "\r"

#define STRING_HEADER

Value:

"-- PWM LED Example --\r\n" \
        "-- "BOARD_NAME" --\r\n" \
        "-- Compiled: "__DATE__" "__TIME__" --"STRING_EOL

Referenced by main().

static void configure_console ( void  )

static

Configure the Console UART.

References uart_rs232_options::baudrate, CONF_UART, CONF_UART_BAUDRATE, CONF_UART_CHAR_LENGTH, CONF_UART_PARITY, CONF_UART_STOP_BITS, CONSOLE_UART_ID, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

int main

(

void

)

Application entry point for PWM with LED example.

Output PWM waves on LEDs to make them fade in and out.

Returns

Unused (ANSI-C compatibility).

References pwm_channel_t::alignment, board_init(), pwm_channel_t::channel, configure_console(), INIT_DUTY_VALUE, PERIOD_VALUE, PIN_PWM_LED0_CHANNEL, PIN_PWM_LED1_CHANNEL, pmc_enable_periph_clk(), pwm_channel_t::polarity, PWM_ALIGN_CENTER, PWM_ALIGN_LEFT, pwm_channel_disable(), pwm_channel_disable_interrupt(), pwm_channel_enable(), pwm_channel_enable_interrupt(), pwm_channel_init(), PWM_FREQUENCY, PWM_HIGH, pwm_init(), PWM_LOW, STRING_HEADER, sysclk_get_cpu_hz(), sysclk_get_peripheral_hz(), sysclk_init(), pwm_clock_t::ul_clka, pwm_channel_t::ul_duty, pwm_channel_t::ul_period, and pwm_channel_t::ul_prescaler.

void PWM0_Handler

(

void

)

Interrupt handler for the PWM controller.

References pwm_channel_t::channel, INIT_DUTY_VALUE, PERIOD_VALUE, PIN_PWM_LED0_CHANNEL, PIN_PWM_LED1_CHANNEL, pwm_channel_get_interrupt_status(), pwm_channel_update_duty(), and PWM_FREQUENCY.

pwm_channel_t g_pwm_channel_led

PWM channel instance for LEDs.