Hi all,
I am new here and new to ASF. And to be quite honest - I have found it quite hard work. That being said, I feel I am making head way. I have pulled a number of examples from various sources, each seem to do things a little differently. I have tried all those I can find and modifed as necessary, but to no prevail. Just trying to get a basic PWM setup, that's all. I've spent time diving into the code and all is making sense, so I don't know what I am missing/doing wrong. If anyone has any suggestions... it would be most appreciated. Thanks in advance. This is an example I pulled from 'All About Circuits', project is attached.
#include <asf.h>
//Create Pin PA1
#define PWM_Pin IOPORT_CREATE_PIN(PIOA, PIO_PA1_IDX)
pwm_channel_t pwm_channel_instance;
int main (void)
{
sysclk_init();
board_init();
//pio_set_peripheral(PWM,PIO_PERIPH_A, PIO_PA1A_PWMH1); I have also tried this instead of pio_configure_pin
//connect peripheral A to pin PA1
pio_configure_pin(PWM_Pin, PIO_TYPE_PIO_PERIPH_A);
//enable the peripheral clock for the PWM hardware
pmc_enable_periph_clk(ID_PWM);
//disable the channel until it is properly configured
pwm_channel_disable(PWM, PWM_CHANNEL_0);
//PWM clock configuration
pwm_clock_t PWM_clock_config =
{
.ul_clka = 1000000,
.ul_clkb = 0,
.ul_mck = sysclk_get_cpu_hz()
};
//apply the clock configuration
pwm_init(PWM, &PWM_clock_config);
//see the article for details
pwm_channel_instance.channel = PWM_CHANNEL_0;
pwm_channel_instance.ul_prescaler = PWM_CMR_CPRE_CLKA;
pwm_channel_instance.polarity = PWM_HIGH;
pwm_channel_instance.alignment = PWM_ALIGN_LEFT;
pwm_channel_instance.ul_period = 100;
pwm_channel_instance.ul_duty = 50;
//apply the channel configuration
pwm_channel_init(PWM, &pwm_channel_instance);
//configuration is complete, so enable the channel
pwm_channel_enable(PWM, PWM_CHANNEL_0);
while(1);
}
