3.1 struct spi_master 用于描述一个SPI控制器 //在include/liunx/spi/spi.h文件中,在数据结构struct spi_master定义如下: struct spi_master { struct device dev; s16 bus_num; u16 num_chipselect; int (*setup)(struct spi_device *spi); int (*transfer)(struct spi_device *spi, struct spi_message...
// 设置spi_master结构体的一些字段 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1,32); master->flags = master_flags; master->bus_num = pdev->id; master->num_chipselect = num_devices; master->setup = spi_gpio_setup; master->cleanup = spi_gpio_cleanup; #ifdefCONFIG_OF master->...
00000543 dev_set_name(&master->dev, "spi%u", master->bus_num); 00000544 status = device_add(&master->dev); 00000545 if (status < 0) 00000546 goto done; 00000547 dev_dbg(dev, "registered master %s%s\n", dev_name(&master->dev), 00000548 dynamic ? " (dynamic)" : ""); 00000549 ...
//SPI控制器structspi_master{structdevicedev;structlist_headlist;//控制器链表//控制器对应的SPI总线号 SPI-2 对应bus_num= 2s16 bus_num; u16 num_chipselect;//控制器支持的片选数量,即能支持多少个spi设备u16 dma_alignment;//DMA缓冲区对齐方式u16 mode_bits;// mode标志/* other constraints relevant...
master->bus_num = pdev->id; master->num_chipselect = SPI_N_CHIPSEL; master->setup = spi_gpio_setup; master->cleanup = spi_gpio_cleanup; spi_gpio->bitbang.master = spi_master_get(master); spi_gpio->bitbang.chipselect = spi_gpio_chipselect; ...
spi->master->bus_num, spi->chip_select);//创建设备文件 status = IS_ERR(dev) ? PTR_ERR(dev) : 0; } else { dev_dbg(&spi->dev, "no minor number available!\n"); status = -ENODEV; } if (status == 0) { set_bit(minor, minors); ...
(spidev_class, &spi->dev, spidev->devt, /* 创建一个设备,通过、dev/spidevx.x */ spidev, "spidev%d.%d", spi->master->bus_num, spi->chip_select); /* spi的第几个spi_master设备,spi的片选信号信息 */ status = PTR_ERR_OR_ZERO(dev); } else { dev_dbg(&spi->dev, "no minor...
defBytesToHex(Bytes):return''.join(["0x%02X "%xforxinBytes]).strip()defspidevTest():# 设置spi的bus号(0,1,2)和片选(0,1)spi_bus=input("Please input SPI bus num:")spi_device=input("Please input SPI cs num:")# 创建spidev类的对象以访问基于spidev的Python函数。
bits=master->mode_bits;if(spi_controller_is_slave(master)){ctlr->mode_bits=0;ctlr->flags=SPI_CONTROLLER_SLAVE;ctlr->bus_num=spi_slave_controller_id++;idr_init(&ctlr->idr);}else{ctlr->mode_bits&=ctlr->controller_ops->get_mode_bits;ctlr->flags|=SPI_CONTROLLER_MASTER;ctlr->bus_num=...
SPI2就bus_num=2master->mode_bits=SPI_CPOL|SPI_CPHA|SPI_LOOP;//所支持的模式master->num_chipselect=ROCKCHIP_SPI_MAX_CS_NUM;//片选最大值+1,spi设备的片选值要小于它master->dev.of_node=pdev->dev.of_node;master->bits_per_word_mask=SPI_BPW_MASK(16)|SPI_BPW_MASK(8);//支持8或16bit...