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spi_bus 如何完成先发后读 #177

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ghost opened this issue Apr 7, 2022 · 1 comment

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ghost commented Apr 7, 2022

目前好像完成不了类似rt_err_t rt_spi_send_then_recv的功能

先发送后接收数据

本函数适合从SPI外设中读取一块数据，本函数中会先发送一些数据（如命令和地址），然后再接收指定长度的数据。此函数等同于调用rt_spi_transfer_message()传输2条消息。

参数
device SPI 从设备句柄
send_buf 发送缓冲区数据指针
send_length 发送缓冲区数据字节数
recv_buf 接收缓冲区数据指针，spi 是全双工的，支持同时收发
recv_length 接收缓冲区数据字节数
返回
RT_EOK 成功，-RT_EIO 失败。

ghost changed the title ~~spi_bus 如何完成先发后度~~ spi_bus 如何完成先发后读

Contributor

TDA-2030 commented Apr 14, 2022

你需要的先发送后接收数据应该启动两次SPI传输就可以完成了

leeebo added the Inactive label

leeebo closed this as completed

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