请教软定时器线程与普通线程同步问题

发布于 2013-04-18 10:54:40 浏览：4990 订阅该版

16 个回答

prife 2013-04-19

这家伙很懒，什么也没写！

zyyqd 2013-04-19

这家伙很懒，什么也没写！

Casper 2021-01-15

这家伙很懒，什么也没写！

aozima 2013-04-18

调网络不抓包，调I2C等时序不上逻辑分析仪，就像电工不用万用表！多用整理的好的文字，比截图更省流量，还能在整理过程中思考。

aozima 2013-04-18

调网络不抓包，调I2C等时序不上逻辑分析仪，就像电工不用万用表！多用整理的好的文字，比截图更省流量，还能在整理过程中思考。

zyyqd 2013-04-18

这家伙很懒，什么也没写！

感谢回复!

```

//软定时器里操作SPI2的代码
    rt_sem_take(&spi_touch_device.lock, RT_WAITING_FOREVER);

for (i=0;i<XY_DETECT_CNT;i++) {
      cmd = TOUCH_MSR_X;
      rt_spi_send_then_recv(spi_touch_device.rt_spi_device,
                            &cmd, 1,
                            buf, 2);
      TouchDataX[i]=(((rt_uint16_t)buf[0]<<5)|(buf[1]>>3))&0x0FFF;
      cmd = TOUCH_MSR_Y;
      rt_spi_send_then_recv(spi_touch_device.rt_spi_device,
                            &cmd, 1,
                            buf, 2);
      TouchDataY[i]=(((rt_uint16_t)buf[0]<<5)|(buf[1]>>3))&0x0FFF;
    }
    ......

//rt_spi_send_then_recv函数的部分代码(spi_core.c系统自带未修改过)
    ......
    result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
    if (result == RT_EOK)
    {
        if (device->bus->owner != device)
        {
            /* not the same owner as current, re-configure SPI bus */
            result = device->bus->ops->configure(device, &device->config);
            if (result == RT_EOK)
            {
                /* set SPI bus owner */
                device->bus->owner = device;
            }
            else
            {
                /* configure SPI bus failed */
                result = -RT_EIO;
                goto __exit;
            }
        }

/* send data */
        message.send_buf   = send_buf;
        message.recv_buf   = RT_NULL;
        message.length     = send_length;
        message.cs_take    = 1;
        message.cs_release = 0;
        message.next       = RT_NULL;

result = device->bus->ops->xfer(device, &message);
    ......

```

schedule后还是继续当前的线程,
rt_mutex_take返回RT_EOK,继续向下执行,并没有跳转到图片线程