Problem with PWM
Posted: Tue Dec 04, 2012 3:36 am
I have a STM32L-Discovery kit. I want to control the brightness of Led4 (connect with pin PB6). I used this code:
But it doesn't work. Led4 is off. What's wrong with my code?
Please help me. Thanks in advance.
Code: Select all
#include "ch.h"
#include "hal.h"
static PWMConfig pwmcfg = {
10000, /* 10kHz PWM clock frequency. */
10000, /* Initial PWM period 1S. */
NULL,
{
{PWM_OUTPUT_ACTIVE_HIGH, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL}
},
0,
};
int main(void) {
halInit();
chSysInit();
pwmStart(&PWMD2, &pwmcfg);
palSetPadMode(GPIOB, 6, PAL_STM32_MODE_OUTPUT);
chThdSleepMilliseconds(2000);
// PWM channel 0 to 50% duty cycle.
pwmEnableChannel(&PWMD2, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD2, 5000));
while (TRUE) {
}
}But it doesn't work. Led4 is off. What's wrong with my code?
Please help me. Thanks in advance.
