1.3.1.7 spi_read/spi_write staticinlinevoidspi_message_init_with_transfers(structspi_message *m,structspi_transfer *xfers,unsignedintnum_xfers){unsignedinti; spi_message_init(m);for(i =0; i < num_xfers; ++i) spi_message_add_tail(&xfers[i], m); }staticinlineintspi_sync_transfer(struct...
2 Linux SPI驱动总体架构 在2.6的linux内核中,SPI的驱动架构可以分为如下三个层次:SPI 核心层、SPI控制器驱动层和SPI设备驱动层。 Linux 中SPI驱动代码位于drivers/spi目录。2.1 SPI核心层 SPI核心层是Linux的SPI核心部分,提供了核心数据结构的定义、SPI控制器驱动和设备驱动的注册、注销管理等API。其为硬件平台无关...
u32 max_speed_hz;/*other constraints relevant to this driver*/u16 flags;#defineSPI_CONTROLLER_HALF_DUPLEX BIT(0) /* can't do full duplex */#defineSPI_CONTROLLER_NO_RX BIT(1) /* can't do buffer read */#defineSPI_CONTROLLER_NO_TX BIT(2) /* can't do buffer write */#defineSPI_...
23. int spi_write_then_read(struct spi_device *spi, 24. const u8 *txbuf, unsigned n_tx, 25. *rxbuf, unsigned n_rx); 这篇博文就到这了,下篇给出一个针对m25p10完整的驱动程序。 Linux下spi驱动开发之m25p10驱动测试目标:在华清远见的FS_S5PC100平台上编写一个简单的spi驱动模块,在probe阶段实现...
SPI write /** * spi_write - SPI synchronous write * @spi: device to which data will be written * @buf: data buffer * @len: data buffer size * Context: can sleep * * This writes the buffer and returns zero or a negative error code. ...
root@TinaLinux:/# tt/base/storage/rwdevCOMMAND:rwdev-d0xFF00-d0xAA55-b 1m-s 10m-a0-a1-a2-l1/mnt/SDCARD/rwdev.tmprwdev:dowrite/read/verifyfordevicesversion:v0.0.4build:CompiledinJul292020at06:20:06date:Thu Jan101:00:471970action:write read verifydata:0xFF000xAA55buffer:1MBloop:1de...
=0) return ret; buffer[0] = 0x00; //cmd low byte buffer[1] = 0x00; if((ret = spi_write_then_read(spi, buffer, 2, NULL, 0)) !=0) return ret; } while (index < len) { buffer[0] = 0x20; //cmd high byte buffer[1] = cmd; if((ret = spi_write_then_read(spi, ...
time make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- 2>&1 | tee build.log编译完成执行读取spi nand可以正常反馈信息xfel spinandFound spi nand flash 'W25N01GV' with 134217728 bytes执行写入指令 xfel spinand write 0 u-boot-sunxi-with-spl.bin 主板断电后重新上电依然进入fel模式,并没有日志打印...
/* Check type, command number and direction */ if (_IOC_TYPE(cmd) != SPI_IOC_MAGIC || _IOC_NR(cmd) != _IOC_NR(SPI_IOC_MESSAGE(0)) || _IOC_DIR(cmd) != _IOC_WRITE) return ERR_PTR(-ENOTTY); tmp = _IOC_SIZE(cmd); if ((tmp % sizeof(struct spi_...
45、write_i2c_block_data command预定义的一些组合: I2C_FUNC_SMBUS_BYTE Handles the SMBus read_byte and write_byte commands I2C_FUNC_SMBUS_BYTE_DATA Handles the SMBus read_byte_data and write_byte_data commands I2C_FUNC_SMBUS_WORD_DATA Handles the SMBus read_word_data and write_word_dat...