10 art32F423板子PWM呼吸灯无效果

发布于 2024-10-17 22:29:33 浏览：422 订阅该版

[tocm]

板子  art32F423VCT7 
rt-thread 5.1.0

官方案列

```c
#define PWM_DEV_NAME        "pwm4"  /* PWM设备名称 */
#define PWM_DEV_CHANNEL     2      /* PWM通道 */
struct rt_device_pwm *pwm_dev;      /* PWM设备句柄 */
#define LED_PIN_NUM          GET_PIN(D,13)；
..........................

```
官方的 tm4 ch2对应的 pd13led灯

![Snipaste_2024-10-17_22-23-15.png](https://oss-club.rt-thread.org/uploads/20241017/698e16c5785c8e9255aec33045345a55.png)

开启了PWM驱动
board.h文件
```c
/*#define BSP_USING_PWM1*/
/*#define BSP_USING_PWM2*/
/*#define BSP_USING_PWM3*/
#define BSP_USING_PWM4
#define BSP_USING_PWM4_CH3
#define BSP_USING_PWM4_CH2

```
at32_msp.c 增加了 pwm4的配置代码

```c
void at32_msp_tmr_init(void *instance)
{
#if defined (BSP_USING_PWM1) || defined (BSP_USING_PWM2) || defined (BSP_USING_PWM4)
    gpio_init_type gpio_init_struct;
    tmr_type *tmr_x = (tmr_type *)instance;

gpio_default_para_init(&gpio_init_struct);
    gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
#ifdef BSP_USING_PWM1
   ......................
#endif
#ifdef BSP_USING_PWM2
    if(tmr_x == TMR2)
    {
        /* tmr2 clock enable */
        crm_periph_clock_enable(CRM_TMR2_PERIPH_CLOCK, TRUE);
        /* gpioa clock enable */
        crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);

/* gpioa configuration: tmr1 channel1 and channel2 as alternate function push-pull */
        gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
        gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
        gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
        gpio_init_struct.gpio_pins = GPIO_PINS_0 | GPIO_PINS_1;
        gpio_init(GPIOA, &gpio_init_struct);

gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE0, GPIO_MUX_1);
        gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE1, GPIO_MUX_1);
    }
#endif
#ifdef BSP_USING_PWM4
    if(tmr_x == TMR4)
    {
        /* tmr2 clock enable */
        crm_periph_clock_enable(CRM_TMR4_PERIPH_CLOCK, TRUE);
        /* gpioa clock enable */
        crm_periph_clock_enable(CRM_GPIOD_PERIPH_CLOCK, TRUE);

/* gpioa configuration: tmr1 channel2 and channel3 as alternate function push-pull */
        gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
        gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
        gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
        gpio_init_struct.gpio_pins = GPIO_PINS_13 | GPIO_PINS_14 ;
        gpio_init(GPIOD, &gpio_init_struct);

gpio_pin_mux_config(GPIOD, GPIO_PINS_SOURCE13, GPIO_MUX_1);
        gpio_pin_mux_config(GPIOD, GPIO_PINS_SOURCE14, GPIO_MUX_1);
    }
#endif
    /* add others */
#endif
}
```

最终led灯没有任何亮, 更没有呼吸灯的效果, 终端也没有错误， 单独点亮led灯是正常

# 问题已解决：

1. GPIO_MUX_1 修改为 GPIO_MUX_2 ，参照官方io复用配置修改
2. oc_output_state值的问题 修改为True

```c
if (!configuration->complementary)
    {
        tmr_oc_config_struct.oc_idle_state = FALSE;
        tmr_oc_config_struct.oc_output_state = FALSE;
        tmr_oc_config_struct.oc_polarity = TMR_OUTPUT_ACTIVE_HIGH;
    }
    else
    {
        tmr_oc_config_struct.occ_idle_state = FALSE;
        tmr_oc_config_struct.occ_output_state = FALSE;
        tmr_oc_config_struct.occ_polarity = TMR_OUTPUT_ACTIVE_HIGH;
    }
```
以上drv_pwm.c 中  tmr_oc_config_struct.oc_output_state = FALSE;
我通过AT32 work beanch 生成的文件

```c
  /* configure channel 2 output settings */
  tmr_output_struct.oc_mode = TMR_OUTPUT_CONTROL_PWM_MODE_A;
  tmr_output_struct.oc_output_state = TRUE;
  tmr_output_struct.occ_output_state = FALSE;
  tmr_output_struct.oc_polarity = TMR_OUTPUT_ACTIVE_HIGH;
  tmr_output_struct.occ_polarity = TMR_OUTPUT_ACTIVE_HIGH;
  tmr_output_struct.oc_idle_state = FALSE;
  tmr_output_struct.occ_idle_state = FALSE;
  tmr_output_channel_config(TMR4, TMR_SELECT_CHANNEL_2, &tmr_output_struct);
  tmr_channel_value_set(TMR4, TMR_SELECT_CHANNEL_2, 0);
  tmr_output_channel_buffer_enable(TMR4, TMR_SELECT_CHANNEL_2, FALSE);
```