RT-Thread BSP Static Build Check (Env 1.5.x) [components][SPI][spi-bit-ops]修复可能的异常操作 #736 Sign in to view logs Summary Jobs RT-Thread Online Packages (STM32F407 RT-Spark) RTduino/Arduino Libraries (STM32F412 Nucleo) RTduino/Arduino Libraries (Raspberry Pico) ...
structops_spi_bus_device{void(*sdo)(int8_tstate);int8_t(*sdi)(void);void(*clk)(int8_tstate);void(*delayus)(uint32_tus); }; a)sdo:数据线,输出1bit; b)sdi:数据线,输入1bit; c)clk:时钟线,控制输出一个高电平或者低电平; d)delayus:延时函数,可以根据mcu时钟进行适当延时,或者可以不用...
一方面对SPI子系统进行初始化工作,注册spi bus,注册spi_masterclass,同时提供spi设备驱动对spi总线进行操作的API。 另一方面SPI子系统对spi控制器层,提供注册控制器的api和回调操作函数。spi.h包含了spi核心层的一些重要数据结构,structspi_master;structspi_transfer;structspi_message,以及一些实现比较简单的函数等。spi...
#define SPI_MASTER_NO_RXBIT(1) /* can't do bufferread*/#define SPI_MASTER_NO_TXBIT(2) /* can't do buffer write *//* lockandmutexforSPI bus locking */spinlock_t bus_lock_spinlock;struct mutex bus_lock_mutex;/* flag indicating that the SPI busislockedforexclusive use */bool bus...
{ctlr->mode_bits&=ctlr->controller_ops->get_mode_bits;ctlr->flags|=SPI_CONTROLLER_MASTER;ctlr->bus_num=spi_master_controller_id++;}dev_set_drvdata(dev,master);dev_info(dev,"registered, %s%s%s\n",ctlr->flags&SPI_CONTROLLER_MASTER?"master":"",ctlr->flags&SPI_CONTROLLER_SLAVE?"slave...
1 : 0, (__u8 __user *)arg); break; case SPI_IOC_RD_BITS_PER_WORD: //读取每个字 的bit位数 retval = put_user(spi->bits_per_word, (__u8 __user *)arg); break; case SPI_IOC_RD_MAX_SPEED_HZ: //最大速率 retval = put_user(spidev->speed_hz, (__u32 __user *)arg); ...
(reg, tmp); // clear bit mask 384 } 385 386 int rc522_init() 387 { 388 int ret; 389 char version = 0; 390 391 //reset 392 WriteRawRC(CommandReg, PCD_RESETPHASE); 393 usleep(10); 394 WriteRawRC(ModeReg, 0x3D); 395 WriteRawRC(TReloadRegL, 30); 396 WriteRawRC(TReloadReg...
#define SPI_BPW_RANGE_MASK(min, max) (SPI_BIT_MASK(max) - SPI_BIT_MASK(min - 1)) /* limits on transfer speed */ u32 min_speed_hz; u32 max_speed_hz; /* other constraints relevant to this driver */ u16 flags; #define SPI_CONTROLLER_HALF_DUPLEX BIT(0) /* can't do full du...
const struct spi_controller_mem_ops *mem_ops; //与SPI内存交互的优化/专用操作。该字段可选,只有在控制器具有内存类操作的原生支持时才应该实现。 const struct spi_controller_mem_caps *mem_caps;//处理内存操作的控制器能力。 struct gpio_desc **cs_gpiods; //用作芯片选择线的GPIO描述符数组;每个CS...
SPI主机驱动就是SOC的SPI控制器驱动，类似I2C驱动里面的适配器驱动。Linux内核使用spi_master表示SPI主机驱动，spi_master是个结构体，定义在include/linux/spi/spi.h文件中，内容如下(有缩减)：示例代码62.1.1.1 spi_master结构体 315struct spi_master { 316struct device dev;317 318 struct list_head list;...