打开SPI设备文件:用户可以通过打开/dev/spidevX.Y文件来访问SPI设备,其中X是SPI控制器的编号,Y是SPI设备的编号。 配置SPI参数:用户可以使用ioctl命令SPI_IOC_WR_MODE、SPI_IOC_WR_BITS_PER_WORD和SPI_IOC_WR_MAX_SPEED_HZ来设置SPI模式、数据位数和时钟速度等参数。 发送和接收数据:用户可以使用read和write系统...
return spi_unregister_driver(&slt_spi_test_driver); } module_exit(slt_spi_test_exit); 对spi 读写操作请参考 include/linux/spi/spi.h,以下简单列出几个 static inline int spi_write(struct spi_device *spi, const void *buf, size_t len) static inline int spi_read(struct spi_device *spi, ...
Reading from the SPDR register causes the data to be read from the receive shift register. The WCOL bit within the SPSR register will be set HIGH(1) if you attempt to write data into the SPDR register during data transmission. WCOL will be cleared (0) when the ...
2) FOR SPI WRITE CYCLES, THE MOSI PIN CONTINUES TO BE HIGH IMPEDANCE AND THE EXTERNAL MASTER CONTINUES TO DRIVE MOSI. 3) FOR SPI READ CYCLES, AFTER THE 8TH CLOCK-FALLING EDGE, THE MAX3421E STARTS DRIVING THE MOSI PIN AFTER TIME tON. THE EXTERNAL MASTER MUST TURN OFF ITS DRIVER TO ...
Rockchip SPI 开发指南 V1.0-20160629
Power-downandReadElectronicSignature(RES)instruction)iecuted. WhileintheDeepPower-downmode,thedeviceignoresallWrite,ProgramandErase instructions(seeDeepPower-down(DP)).Thiscanbeusedasanextrasoftwareprotection mechanism,whenthedeviceisnotinactiveuse,toprotectthedevicefrominadvertent Write,ProgramorEraseinstructions....
spi_write_and_read_slt通过SPI总线向指定的SPI设备进行同时写入和读取操作。它使用了spi_transfer结构体和spi_message结构体来描述数据传输的相关参数,并调用spi_sync函数执行SPI设备的同步传输操作,将spi和m作为参数传入。该函数会阻塞直到传输完成。。 int spi_write_then_read_slt(int id, const void *txbuf, ...
2) FOR SPI WRITE CYCLES, THE MOSI PIN CONTINUES TO BE HIGH IMPEDANCE AND THE EXTERNAL MASTER CONTINUES TO DRIVE MOSI. 3) FOR SPI READ CYCLES, AFTER THE 8TH CLOCK-FALLING EDGE, THE MAX3421E STARTS DRIVING THE MOSI PIN AFTER TIME tON. THE EXTERNAL MASTER MUST TURN OFF ITS DRIVER TO ...