请教个问题，我用BK7321，输出pwm，和adc，等其他外设没反应

发布于 2019-05-14 18:15:36 浏览：1803 订阅该版

* 本帖最后由 aozima 于 2019-5-14 19:26 编辑 *

```OSStatus wh_pwm_initialize(bk_pwm_t pwm, uint32_t frequency, float duty_cycle)
{
    UINT32 ret;
    pwm_param_t param;

/*init pwm*/
    param.channel         = (uint8_t)pwm;
    param.cfg.bits.en     = PWM_DISABLE;
    param.cfg.bits.int_en = PWM_INT_EN;
    param.cfg.bits.mode   = PMODE_PWM;
    param.cfg.bits.clk    = PWM_CLK_26M;
    param.p_Int_Handler   = 0;
    param.duty_cycle      = duty_cycle;
    param.end_value       = frequency;  // ?????

ret = sddev_control(PWM_DEV_NAME, CMD_PWM_INIT_PARAM, ¶m);
 ASSERT(PWM_SUCCESS == ret);
 rt_kprintf("liuweihao:%d ",ret);//liuweihao

return kNoErr;
}

OSStatus wh_pwm_start(bk_pwm_t pwm)
{
    UINT32 ret;
    UINT32 param;
        bk_gpio_config_output(GPIO19);
        bk_gpio_output(GPIO19, 1);

param = pwm;
 ret = sddev_control(PWM_DEV_NAME, CMD_PWM_UNIT_ENABLE, ¶m);
 ASSERT(PWM_SUCCESS == ret);
 rt_kprintf("wh_pwm_startliuweihao:%d ",ret);//liuweihao

return kNoErr;
}

OSStatus wh_pwm_stop(bk_pwm_t pwm)
{
    UINT32 ret;
    UINT32 param;

param = pwm;
    ret = sddev_control(PWM_DEV_NAME, CMD_PWM_UINT_DISABLE, ¶m);
    ASSERT(PWM_SUCCESS == ret);

return kNoErr;
}

#if        1
#define PWM_DEV_NAME        "pwm"  /* PWM设备名称 */
#define PWM_DEV_CHANNEL     5       /* PWM通道 */

struct rt_device_pwm *pwm_dev;      /* PWM设备句柄 */

static int pwm_led_sample(int argc, char *argv[])
{
    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 */
        
//        bk_gpio_config_output(GPIO19);
        //bk_gpio_output(GPIO19, 1);
        
        wh_pwm_initialize(5,6500,3000);
wh_pwm_start(5);

/* 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! can't find %s device! ", PWM_DEV_NAME);
 return RT_ERROR;
 }

/* 设置PWM周期和脉冲宽度默认值 */
    rt_pwm_set(PWM_DEV_CHANNEL, period, pulse);

/* 使能设备 */
   rt_pwm_enable( PWM_DEV_CHANNEL);

rt_kprintf("pwm 8888sample run failed! can't find %s device! ", pwm_dev);

while (1)
    {rt_thread_mdelay(150);

if (dir)
        {
            pulse += 5000;      /* 从0值开始每次增加5000ns */
        }
        else
        {
            pulse -= 5000;      /* 从最大值开始每次减少5000ns */
        }
        if (pulse >= period)
        {
            dir = 0;
        }
        if (0 == pulse)
        {
            dir = 1;
        }
        //        wh_pwm_initialize(5,6500,3000);
        //                wh_pwm_start(5);
        //        rt_thread_mdelay(150);
        //        wh_pwm_stop(5);

/* 设置PWM周期和脉冲宽度 */
       rt_pwm_set( PWM_DEV_CHANNEL, period, pulse);

}
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(pwm_led_sample, pwm sample);

void pwm_led_thread_entry(void *parameter)
{
        pwm_led_sample(0,RT_NULL);

}
int pwm_led_thread_init(void)
{
 rt_thread_t thread;
 thread =rt_thread_create("pwm_led", pwm_led_thread_entry,RT_NULL,512,20,10 );
 if (thread != RT_NULL)
 {
 rt_thread_startup(thread);
 rt_kprintf("pwm_led_rt_thread_startup ");
 }
return RT_EOK;
}
//INIT_APP_EXPORT(pwm_led_thread_init);

#endif```

主函数就调用pwm_led_thread_init（）；个人调试出现的现象是  
 /* 设置PWM周期和脉冲宽度默认值 */
 rt_pwm_set(PWM_DEV_CHANNEL, period, pulse);这个设置失败；
后面有人提示我没初始化，我按bk提供的例程修改        
        wh_pwm_initialize(5,6500,3000);
wh_pwm_start(5);
初始化了这两个，还是不能输出PWM,求大佬解答