spi_write_then_read函数分析 1. 基本功能和用途 spi_write_then_read函数是一个用于SPI(串行外设接口)通信的函数,它首先向SPI设备写入一系列数据,然后紧接着从同一设备读取数据。这个函数常用于需要同时进行数据发送和接收的场景,例如配置寄存器或读取设备状态。
在spi_write_then_read中,可变寄存器大小表示可以根据需求动态调整寄存器的大小。这意味着在每次传输数据时,可以根据具体情况选择不同大小的寄存器来存储数据。 spi_write_then_read的操作流程如下: 写入数据:首先,将要发送的数据写入到SPI发送缓冲区中。
STM32驱动SD卡的代码段用到了SD_SPI_ReadWriteByte返回值不一样是为什么? 上图是STM32驱动SD卡的代码段,都用到了SD_SPI_ReadWriteByte(0xFF),但是返回值好像不太一样啊,这是什么情况,没搞懂或者说,就单纯针对SPI协议,这里该怎么理解
Write data to and read data from an SPI device connected to your Arduino board. Using this block, you can access an SPI device to measure quantities such as temperature, and pressure. You can also access an SPI device to support Wi-Fi® connectivity, and to access an SD card to store...
But what I don't understand is how to use SPI to control these state changes. Do I need to provide a Linux driver for TJA1145? Can someone provide me a basic walkthrough on how to enable this CAN transceiver on S32G399A LLCE_CAN interface? Thank you very much for ...
Write data to and read data from an SPI device connected to your Arduino board. Using this block, you can access an SPI device to measure quantities such as temperature, and pressure. You can also access an SPI device to support WiFi connectivity, and to access an SD card to store data...
); SYNC_L; // spi1_ readwritebyte( 0x88) ; spi1_ 重写byte( 0xfc) ; spi1_ 读写byte( 0xba) ; 同步_h; 延迟_us( 510 YYXIAO 2023-11-30 07:57:14 SPI发送缓冲和接收缓冲空与非空意味着什么 原子哥,在SPI的初始化函数SPIx_Init()中的最后一个语句是:SPIx_ReadWriteByte(0xff)//启动...
//SPI1 读写一个字节 //TxData:要写入的字节 //返回值:读取到的字节 u8 SPI1_ReadWriteByte(u8 ...
spi_read write address time out Dentry cache hash table entries: 4096 (order: 2, 16384 bytes) Inode-cache hash table entries: 2048 (order: 1, 8192 bytes) Memory available: 14740k/16384k RAM, 0k/0k ROM (1196k kernel code, 255k data) Mount-cache hash table entries: 512 (order...
i'm trying to communicate with NRF24L01 RFmodule, it seems that spi init. is ok , but when i'm trying to read for example theREG_RF_CH Registry (0x05) it should return the reset value (0x02) but that does not happen !! it return 0x00 for the first time then atthe second time...