rt-thread work queue 延时较大

发布于 2021-08-05 21:04:19 浏览：989 订阅该版

[tocm]

## 问题描述
rt-thread workqueue 从中断触发到执行有2~3ms 延时，不知是哪里问题？

## 问题细节：

s0: 工作队列优先级: 已经试最高

```c
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
thd_spi3   5  suspend 0x00000090 0x00000800    24%   0x00000001 000
thd_spi2   5  suspend 0x00000090 0x00000800    25%   0x00000001 000
thd_spi1   5  suspend 0x00000090 0x00000800    24%   0x00000001 000
thd_spi0   5  suspend 0x00000090 0x00000800    34%   0x00000001 000
spi_wq     1  suspend 0x00000148 0x00001000    09%   0x00000007 000   // 工作队列优先级 最高是中断
thd_card   5  suspend 0x000000e8 0x00000400    36%   0x00000001 000
thd_jsd    5  suspend 0x000000a0 0x00000400    38%   0x00000001 000
thd_xsd    5  suspend 0x000000a0 0x00000400    40%   0x00000001 000
thd_bee    4  suspend 0x000000a4 0x00000400    16%   0x00000001 000
thd_lcd    5  suspend 0x000000cc 0x00000400    32%   0x00000001 000
tshell    20  ready   0x00000220 0x00000c18    17%   0x00000002 000
tidle     31  ready   0x00000048 0x00000100    40%   0x00000007 000
main      10  suspend 0x0000010c 0x00000800    30%   0x00000013 000
```

日志测试时间:

```c
void drv_spi_irq_rx_work(struct rt_work *work, void *work_data)
{
  uint8_t sbuf_size = 0;
  struct spi_work_data *spi_data = NULL;
  spi_data = (struct spi_work_data *)work_data;
	LOG_D("rx s0");
  /* s0：提取数据 */
  sbuf_size = app_data_queue_size(SPI0_S + spi_data->port * 2);
  if (sbuf_size > 0)
  {
		LOG_D("rx s1");
    uint8_t *s_pac = app_data_queue_pop(SPI0_S + spi_data->port * 2);
    /* s1: 发送数据: 此处存在 dma_sem 管理发送完成才会退出函数 */
    app_spi_transfer(spi_data->port, &(port_ant[spi_data->port].ant_spi), s_pac,
                     port_ant[spi_data->port].rpac, ANT_SPI_LEN);
    /* s2: 回收数据 */
    app_data_queue_push(IDLE_E, s_pac);
    /* s3: 数据发送完成继续扫描数据 */
    if (app_data_queue_size(SPI0_S + spi_data->port * 2) == 0)
    {
      rt_sem_release(&(port_ant[spi_data->port].scan_lock));
    }
		LOG_D("rx s2");
  }
  else
  {
		LOG_D("tx rx");
    app_spi_transfer(spi_data->port, &(port_ant[spi_data->port].ant_spi),
                     port_ant[spi_data->port].spac,
                     port_ant[spi_data->port].rpac, ANT_SPI_LEN);
  }
  /* 解析数据 */
  // app_dtq_rcmd_decode(&port_ant[spi_data->port], \
                      (spi_pac_t *)(port_ant[spi_data->port].rpac));
}
```

```
[534518]: isr rx 接收中断时间 
[534521]: rx s0  工作队列函数开始时间
[534521]: rx s1
[534522]: rx s2
```

实际测量测试时隙:

**SPI_FIFO 是从机控制的管脚，主机配置为上升沿中断，有数据上报拉高，数据读走后拉低**
![6CDECDBF-A2C6-4c53-9D69-9889D26D1EE7.png](https://oss-club.rt-thread.org/uploads/20210805/9ba41942af917a22f7dfd691455cde46.png.webp)