| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file Sample app to demonstrate PWM. |
| * |
| * This app uses PWM pins 0, 1, and 2. |
| */ |
| |
| #include <zephyr.h> |
| #include <sys/printk.h> |
| #include <device.h> |
| #include <drivers/pwm.h> |
| |
| #if defined(DT_ALIAS_RED_PWM_LED_PWMS_CONTROLLER) && \ |
| defined(DT_ALIAS_RED_PWM_LED_PWMS_CHANNEL) && \ |
| defined(DT_ALIAS_GREEN_PWM_LED_PWMS_CONTROLLER) && \ |
| defined(DT_ALIAS_GREEN_PWM_LED_PWMS_CHANNEL) && \ |
| defined(DT_ALIAS_BLUE_PWM_LED_PWMS_CONTROLLER) && \ |
| defined(DT_ALIAS_BLUE_PWM_LED_PWMS_CHANNEL) |
| /* Get the defines from dt (based on aliases 'red-pwm-led', 'green-pwm-led' & |
| * 'blue-pwm-led') |
| */ |
| #define PWM_DEV0 DT_ALIAS_RED_PWM_LED_PWMS_CONTROLLER |
| #define PWM_CH0 DT_ALIAS_RED_PWM_LED_PWMS_CHANNEL |
| #define PWM_DEV1 DT_ALIAS_GREEN_PWM_LED_PWMS_CONTROLLER |
| #define PWM_CH1 DT_ALIAS_GREEN_PWM_LED_PWMS_CHANNEL |
| #define PWM_DEV2 DT_ALIAS_BLUE_PWM_LED_PWMS_CONTROLLER |
| #define PWM_CH2 DT_ALIAS_BLUE_PWM_LED_PWMS_CHANNEL |
| #else |
| #error "Choose supported board or add new board for the application" |
| #endif |
| |
| /* |
| * 50 is flicker fusion threshold. Modulated light will be perceived |
| * as steady by our eyes when blinking rate is at least 50. |
| */ |
| #define PERIOD (USEC_PER_SEC / 50U) |
| |
| /* in micro second */ |
| #define STEPSIZE 2000 |
| |
| static int write_pin(struct device *pwm_dev, u32_t pwm_pin, |
| u32_t pulse_width) |
| { |
| return pwm_pin_set_usec(pwm_dev, pwm_pin, PERIOD, pulse_width); |
| } |
| |
| void main(void) |
| { |
| struct device *pwm_dev[3]; |
| u32_t pulse_width0, pulse_width1, pulse_width2; |
| |
| printk("PWM demo app-RGB LED\n"); |
| |
| pwm_dev[0] = device_get_binding(PWM_DEV0); |
| pwm_dev[1] = device_get_binding(PWM_DEV1); |
| pwm_dev[2] = device_get_binding(PWM_DEV2); |
| if (!pwm_dev[0] || !pwm_dev[1] || !pwm_dev[2]) { |
| printk("Cannot find PWM device!\n"); |
| return; |
| } |
| |
| while (1) { |
| for (pulse_width0 = 0U; pulse_width0 <= PERIOD; |
| pulse_width0 += STEPSIZE) { |
| if (write_pin(pwm_dev[0], PWM_CH0, |
| pulse_width0) != 0) { |
| printk("pin 0 write fails!\n"); |
| return; |
| } |
| |
| for (pulse_width1 = 0U; pulse_width1 <= PERIOD; |
| pulse_width1 += STEPSIZE) { |
| if (write_pin(pwm_dev[1], PWM_CH1, |
| pulse_width1) != 0) { |
| printk("pin 1 write fails!\n"); |
| return; |
| } |
| |
| for (pulse_width2 = 0U; pulse_width2 <= PERIOD; |
| pulse_width2 += STEPSIZE) { |
| if (write_pin(pwm_dev[2], PWM_CH2, |
| pulse_width2) != 0) { |
| printk("pin 2 write fails!\n"); |
| return; |
| } |
| k_sleep(MSEC_PER_SEC); |
| } |
| } |
| } |
| } |
| } |