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标题: 怎样让px30支持spi slave, 内核版本4.4 [打印本页]

作者: wly 时间: 2022-1-20 19:22
标题: 怎样让px30支持spi slave, 内核版本4.4
px30 kernel4.4默认不支持spi slave模式，有什么补丁让它支持spi slave吗

作者: 时间的蝴蝶 时间: 2022-1-21 09:44
参考 SDK 文档：SDK/docs/Common/SPI/
https://gitlab.com/firefly-linux/docs/-/tree/firefly/Common/SPI

作者: wly 时间: 2022-1-21 16:13

时间的蝴蝶发表于 2022-1-21 09:44
参考 SDK 文档：SDK/docs/Common/SPI/
https://gitlab.com/firefly-linux/docs/-/tree/firefly/Common/SPI

我按照文档添加了补丁，可以接收数据，但是数据总是不对，您知道啥原因吗，理论收到的数据应该都是：00 00 00 02，而我实际收到的数据确是如下：
RX | 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00
RX | 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00
RX | 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00
RX | 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00
RX | 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00
RX | 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00
RX | 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00
RX | 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00
RX | 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00
RX | 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00
RX | 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00
RX | 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 00
RX | 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00
RX | 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00
RX | 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00
RX | 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00
RX | 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02
RX | 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02
RX | 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02
RX | 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02 00 00 00 02

作者: 时间的蝴蝶 时间: 2022-1-22 09:51

wly 发表于 2022-1-21 16:13
我按照文档添加了补丁，可以接收数据，但是数据总是不对，您知道啥原因吗，理论收到的数据应该都是：00 0 ...

看样子像是数据错开了一位，降低下通讯时钟呢？

作者: wly 时间: 2022-1-22 12:52

时间的蝴蝶发表于 2022-1-22 09:51
看样子像是数据错开了一位，降低下通讯时钟呢？

现在时钟降到800hz了，还是这个情况，直接读取spi的RXDR寄存器值也是有时候是00 00 00 01，有时候是00 00 00 02，有时候是00 00 40 00，等等。
有一个比较特别的情况就是，我应用层调用spi_read去读取数据，每一次读取的结果是一样的，比如：
我第1次调用spi_read读取512字节数据，读取到的数据都是00 00 00 01，
第2次调用spi_read读取512字节数据，读取到的数据都是00 00 00 02，
第3次调用spi_read读取512字节数据，读取到的数据都是00 00 40 00，
不会出现说我第1次读取到的数据里既有00 00 00 01，也有00 00 00 02的情况。
而我用逻辑分析抓取到数据解析结果一直都是正确的：00 00 00 02.

作者: 时间的蝴蝶 时间: 2022-1-24 09:26

wly 发表于 2022-1-22 12:52
现在时钟降到800hz了，还是这个情况，直接读取spi的RXDR寄存器值也是有时候是00 00 00 01，有时候是00 00 ...

那就尴尬了～有没有留意里面的注意事项、调试方法和问题说明？
或者对照下 rk356x 的 4.19 kernel 驱动。

作者: wly 时间: 2022-1-24 09:48

时间的蝴蝶发表于 2022-1-24 09:26
那就尴尬了～有没有留意里面的注意事项、调试方法和问题说明？
或者对照下 rk356x 的 4.19 kernel 驱动 ...

我一开始也怀疑我移植的驱动问题，所以升级了内核重新测试，还是一样的问题，现在的内核是4.19，就感觉不知道哪里出了问题，时序也对上了，就是接收的数据不对

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