app开发搭建,淄博网站排名seo,宣传片拍摄公司排名,简便网站建设为了展示PWM效果#xff0c;这里用ADC来采集PWM输出通道的电平变化 第一步#xff0c;进入RT-Thread Settings配置PWM驱动 第二步#xff0c;进入board.h#xff0c;打开PWM宏 第三步#xff0c;进入STM32CubeMX#xff0c;配置时钟及PWM 第四步#xff0c;回到R…为了展示PWM效果这里用ADC来采集PWM输出通道的电平变化 第一步进入RT-Thread Settings配置PWM驱动 第二步进入board.h打开PWM宏 第三步进入STM32CubeMX配置时钟及PWM 第四步回到RT-Thread Studio编译发现程序报错 第五步双击错误定位到具体位置屏蔽相关错误再次编译发现错误消失 第六步添加构建CubeMX生成的tim.c 第七步进入main.c查找PWM设备设置PWM周期和脉冲宽度并使能PWM
struct rt_device_pwm *pwm_dev(struct rt_device_pwm *)rt_device_find(“PWM3”);rt_pwm_set(pwm_dev, 3, period, pulse); /* 周期为period、脉宽为pulse */
rt_pwm_enable(pwm_dev, 3); /* 使能通道3 */第八步设置脉宽变化方便ADC采样查看 if (dir){pulse 500; /* 从0值开始每次增加5000ns */}else{pulse - 500; /* 从最大值开始每次减少5000ns */}if (pulse period){dir 0;}if (0 pulse){dir 1;} rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);第九步ADC采样
value rt_adc_read(adc_dev, ADC_DEV_CHANNEL); /* 读取采样值 */
vol value * REFER_VOLTAGE / CONVERT_BITS; /* 转换为对应电压值 */
rt_kprintf(%d --- %d.%02d \n, value,vol / 100, vol % 100);综上main.c
#include rtthread.h
#include rtdbg.h
#include rtdevice.h
#include board.h#define DBG_TAG main
#define DBG_LVL DBG_LOG#define ADC_DEV_NAME adc1 /* ADC 设备名称 */
#define ADC_DEV_CHANNEL 1 /* ADC 通道 */
#define REFER_VOLTAGE 330 /* 参考电压 3.3V,数据精度乘以100保留2位小数*/
#define CONVERT_BITS (1 12) /* 转换位数为12位 */#define PWM_DEV_NAME pwm3 /* PWM设备名称 */
#define PWM_DEV_CHANNEL 3 /* PWM通道 PB1 */
struct rt_device_pwm *pwm_dev; /* PWM设备句柄 */int main(void)
{/*ADC*/rt_adc_device_t adc_dev;rt_uint32_t value, vol;/*PWM*/rt_uint32_t period, pulse, dir;period 500000; /* 周期为0.5ms单位为纳秒ns */dir 1; /* PWM脉冲宽度值的增减方向 */pulse 0; /* PWM脉冲宽度值单位为纳秒ns */adc_dev (rt_adc_device_t)rt_device_find(ADC_DEV_NAME); /* 查找设备 */if (adc_dev RT_NULL){rt_kprintf(adc sample run failed! cant find %s device!\n, ADC_DEV_NAME);return RT_ERROR;}else {rt_kprintf(find %s success!\n,ADC_DEV_NAME);}rt_adc_enable(adc_dev, ADC_DEV_CHANNEL);/* 查找设备 */pwm_dev (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME);if (pwm_dev RT_NULL){rt_kprintf(pwm sample run failed! cant find %s device!\n, PWM_DEV_NAME);return RT_ERROR;}/* 设置PWM周期和脉冲宽度默认值 */rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);/* 使能设备 */rt_pwm_enable(pwm_dev, PWM_DEV_CHANNEL);while (1){rt_thread_mdelay(100);if (dir){pulse 500; /* 从0值开始每次增加5000ns */}else{pulse - 500; /* 从最大值开始每次减少5000ns */}if (pulse period){dir 0;}if (0 pulse){dir 1;}/* 设置PWM周期和脉冲宽度 */rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);/* 读取采样值 */value rt_adc_read(adc_dev, ADC_DEV_CHANNEL);/* 转换为对应电压值 */vol value * REFER_VOLTAGE / CONVERT_BITS;rt_kprintf(%d --- %d.%02d \n, value,vol / 100, vol % 100);}return RT_EOK;
}
实测如下
