使用rt-thread pwm 框架實(shí)現(xiàn)支持電機(jī)正反轉(zhuǎn)例子
#include <rtthread.h> #include <rtdevice.h> #include <drv_pwm.h> #define PWM_CHANNEL 1 #define PWM_PERIOD 20000 /* 20ms */ #define MOTOR_FORWARD 1 #define MOTOR_BACKWARD 0 struct motor_device { struct rt_device_pwm *pwm_device; rt_uint32_t channel; rt_uint32_t period; rt_uint32_t forward_duty; rt_uint32_t backward_duty; }; /* 初始化電機(jī)設(shè)備 */ static rt_err_t motor_init(struct motor_device *motor, const char *pwm_device_name) { /* 獲取PWM設(shè)備 */ motor->pwm_device = (struct rt_device_pwm *) rt_device_find(pwm_device_name); if (motor->pwm_device == RT_NULL) { rt_kprintf("motor device %!s(MISSING) not found!\n", pwm_device_name); return -RT_ERROR; } motor->channel = PWM_CHANNEL; motor->period = PWM_PERIOD; motor->forward_duty = 0; /* 初始正轉(zhuǎn)占空比為0%!(BADWIDTH)%!/(MISSING) motor->backward_duty = 0; /* 初始反轉(zhuǎn)占空比為0%!(BADWIDTH)%!/(MISSING) /* 初始化PWM設(shè)備 */ rt_pwm_set(motor->pwm_device, motor->channel, motor->period, motor->forward_duty); return RT_EOK; } /* 設(shè)置電機(jī)正轉(zhuǎn)占空比 */ static void motor_set_forward_duty(struct motor_device *motor, rt_uint32_t duty) { motor->forward_duty = duty; rt_pwm_set(motor->pwm_device, motor->channel, motor->period, motor->forward_duty); } /* 設(shè)置電機(jī)反轉(zhuǎn)占空比 */ static void motor_set_backward_duty(struct motor_device *motor, rt_uint32_t duty) { motor->backward_duty = duty; rt_pwm_set(motor->pwm_device, motor->channel, motor->period, motor->backward_duty); } /* 控制電機(jī)正反轉(zhuǎn) */ static void motor_control(struct motor_device *motor, rt_uint8_t direction) { if (direction == MOTOR_FORWARD) { /* 正轉(zhuǎn) */ rt_pwm_set(motor->pwm_device, motor->channel, motor->period, motor->forward_duty); } else if (direction == MOTOR_BACKWARD) { /* 反轉(zhuǎn) */ rt_pwm_set(motor->pwm_device, motor->channel, motor->period, motor->backward_duty); } else { /* 停止 */ rt_pwm_set(motor->pwm_device, motor->channel, motor->period, 0); } } /* 電機(jī)測試函數(shù) */ static void motor_test(struct motor_device *motor) { /* 正轉(zhuǎn)1s,反轉(zhuǎn)1s,停止1s */ motor_control(motor, MOTOR_FORWARD); rt_thread_mdelay(1000); motor_control(motor, MOTOR_BACKWARD); rt_thread_mdelay(1000); motor_control(motor, 2); rt_thread_mdelay(1000); } /* 電機(jī)設(shè)備對象 */ static struct motor_device motor; int motor_pwm_sample(void) { /* 初始化電機(jī)設(shè)備 */ motor_init(&motor, "pwm"); /* 測試電機(jī) */ motor_test(&motor); return 0; }
在上述代碼中,我們定義了一個 motor_device 結(jié)構(gòu)體,用于保存電機(jī)的 PWM 設(shè)備、通道、周期、正轉(zhuǎn)占空比和反轉(zhuǎn)占空比等信息。motor_init 函數(shù)用于初始化電機(jī)設(shè)備,其中我們通過 rt_device_find 函數(shù)獲取 PWM 設(shè)備并保存到 motor->pwm_device 中。motor_set_forward_duty 和 motor_set_backward_duty 函數(shù)用于設(shè)置電機(jī)正轉(zhuǎn)和反轉(zhuǎn)占空比,motor_control 函數(shù)根據(jù)傳入的參數(shù)控制電機(jī)正反轉(zhuǎn)或停止。motor_test 函數(shù)用于測試電機(jī)的正反轉(zhuǎn)功能。 在主函數(shù)中,我們調(diào)用 motor_init 函數(shù)初始化電機(jī)設(shè)備,并調(diào)用 motor_test 函數(shù)測試電機(jī)的正反轉(zhuǎn)功能。
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