[问答]

如何实现Tiny4412通过NRF24L01 2.4G无线模块发送数据呢

问答对人有帮助，内容完整，我也想知道答案 0 Linux下SPI设备驱动该怎样去编写呢？如何实现tiny4412通过NRF24L01 2.4G无线模块发送数据呢？ 0
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答案对人有帮助，有参考价值 0 硬件平台：友善之臂Ting4412 ： NRF24L01 2.4G无线模块SPI接口内核版本：Linux3.5 硬件连接方式以前在STM32F103C8T6上使用STM32的SPI控制器驱动过NRF24L01 2.4G无线模块，最近学习Linux设备驱动，刚好同学手边有一个Tiny4412开发板就当是练练手，顺便学习学习Linux下SPI设备驱动的编写。 NRF24L01 2.4G无线模块的SPI驱动暂时只是调试通过，能够实现Tiny4412通过NRF24L01 2.4G无线模块发送数据，暂时没写成字符设备驱动，在内核定时器中调用spi_write函数不断发送数据。通信现象： STM32没接到数据就会报错，如下：一旦加载驱动模块，就立马接收正常，如下： ......................................................................................只说流程，不说原理............................................................................ 1、构造struct spi_board_info对象，这里我们暂时构造两个，方便以后在SPI0控制器上挂载两个NFR24L01设备，实现相互收发数据。 struct s3c64xx_spi_csinfo cs0={ .fb_delay = 0, .line = EXYNOS4_GPX3(2),//片选引脚 }; struct s3c64xx_spi_csinfo cs1={ .fb_delay = 0, .line = EXYNOS4_GPX3(4),//片选引脚 }; static struct spi_board_info nrf24l01_spi_info[]={ { .modalias = DEV_NAME_01, .max_speed_hz = 1010001000,//最大时钟，需比设备要求的时钟大，暂选10Mhz .bus_num = 0,/exynos4412 的spi0控制器/ .chip_select = EXYNOS4_GPX3(2),/由spi master确定其最大值/ .mode = SPI_MODE_0, .platform_data = (void)EXYNOS4_GPX3(3), /平台数据，作为NRF24LXX的CE引脚/ .controller_data= (void)&cs0, }, { .modalias = DEV_NAME_02, .max_speed_hz = 1010001000,//最大时钟，需比设备要求的时钟大，暂选10Mhz .bus_num = 0,/exynos4412 的spi0控制器/ .chip_select = EXYNOS4_GPX3(4),/由spi master确定其最大值/ .mode = SPI_MODE_0, .platform_data = (void)EXYNOS4_GPX3(5), /平台数据，作为NRF24LXX的CE引脚/ .controller_data= (void)&cs1, }, }; 2、注册它，内核会依据构造的struct spi_board_info 对象创建对应的struct spi_device对象。在init函数中注册构造好的truct spi_board_info对象static struct spi_board_info nrf24l01_spi_info[] static int __init demo_init(void) { printk(KERN_INFO"current func is-------------------------------------------%sn",__FUNCTION__); /spi_register_board_info 依照spi_board_info 和spi_master的bus_num比较，匹配成功会生成一个对应的spi_device对象 / return spi_register_board_info(nrf24l01_spi_info,ARRAY_SIZE(nrf24l01_spi_info)); } 看看spi_register_board_info干了什么？ int spi_register_board_info(struct spi_board_info const info, unsigned n) //master和bi->board_info的bus_nus比较，相等则调用spi_new_device创建spi_device对象 spi_match_master_to_boardinfo(master, &bi->board_info);调用spi_new_device spi_new_device(struct spi_master master,struct spi_board_info chip) int spi_add_device(struct spi_device spi)//注册struct spi_device /spi_add_device注册struct spi_device时候会做一些判断，一会进去分析 / 分析spi_new_device int spi_register_board_info(struct spi_board_info const info, unsigned n) //master和bi->board_info的bus_nus比较，相等则调用spi_new_device创建spi_device对象 spi_match_master_to_boardinfo(master, &bi->board_info);调用spi_new_device spi_new_device(struct spi_master master,struct spi_board_info chip) int spi_add_device(struct spi_device spi)//注册struct spi_device /spi_add_device注册struct spi_device时候会做一些判断，比如我们第一步构造 static struct spi_board_info中的chip_select会和spi_master的num_chipselect做比较要求设置我们的片选信号不能大于spi_master的num_chipselect * if (spi->chip_select >= spi->master->num_chipselect) { * dev_err(dev, "cs%d >= max %dn",spi->chip_select,spi->master->num_chipselect); * return -EINVAL;//直接报错返回，导致我们不能注册spi_device对象...... * 这个问题怎么解决？我们直接修改spi主控器驱动就好了。 } 修改 vi arch/arm/mach-exynos/mach-tiny4412.c中设置spi控制器函数 * s3c64xx_spi0_set_platdata(NULL,0,1)这个函数就好了，内核默认设置 * 最大片选值为1，也就是说默认最多支持1个spi设备，那好了我们把它修改 * 大一些就好了，直接修改到0xffff，保证它一定能注册成功。 / 至于程序中 struct s3c64xx_spi_csinfo cs0 和struct s3c64xx_spi_csinfo cs1怎么来的？为什么需要这两个？这个是安装驱动后看内核看内核打印错误信息找出来的。出错的地方为 driversspispi-s3c64xx.c的static int s3c64xx_spi_setup(struct spi_device spi)函数中报if (IS_ERR_OR_NULL(cs)) { dev_err(&spi->dev, "No CS for SPI(%d)n", spi->chip_select); return -ENODEV; } 意思是cs为空，那么追溯cs，发现 spi_device spi->controller_data = cs;那好，我们就在 static struct spi_board_info nrf24l01_spi_info[]添加.controller_data= (void)&cs0即可。 struct s3c64xx_spi_csinfo cs0={ .fb_delay = 0, .line = EXYNOS4_GPX3(2), }; struct s3c64xx_spi_csinfo cs1={ .fb_delay = 0, .line = EXYNOS4_GPX3(4), }; 好了下面编译成模块，但是编译的时候报WARNING: "spi_register_board_info"/nrf24xx_spi_device.ko] undefined!第一感觉是 spi_register_board_info相关的头文件没有，但是相关spi的头文件都加了，查资料发现原来是linux3.5源码中没有将spi_register_board_info函数导出符号表。那好，就编译进内核得了，将nrf24xx_spi_device.c复制drivers/spi目录下，修改Makefile，将nrf24xx_spi_device.c编译进内核。下面先给出nrf24xx_spi_device.c源码。 #include #include #include #include #include #include #include #include #include #include #include /***************硬件相关的信息*************/ #define DEV_NAME_01 "nrf24xx_spi_01" #define DEV_NAME_02 "nrf24xx_spi_02" #define DEV1_CS_PIN EXYNOS4_GPX3(2) #define DEV2_CS_PIN EXYNOS4_GPX3(4) #define DEV1_CE_PIN EXYNOS4_GPX3(3) #define DEV2_CE_PIN EXYNOS4_GPX3(5) / 片选引脚接在GPX3_2 / struct s3c64xx_spi_csinfo cs0={ .fb_delay = 0, .line = EXYNOS4_GPX3(2),//片选引脚 }; struct s3c64xx_spi_csinfo cs1={ .fb_delay = 0, .line = EXYNOS4_GPX3(4),//片选引脚 }; static struct spi_board_info nrf24l01_spi_info[]={ { .modalias = DEV_NAME_01, .max_speed_hz = 210001000,//最大时钟，需比设备要求的时钟大，暂选2Mhz .bus_num = 0,/exynos4412 的spi0控制器/ .chip_select = EXYNOS4_GPX3(2),/由spi master确定其最大值/ .mode = SPI_MODE_0, .platform_data = (void)EXYNOS4_GPX3(3), /平台数据，作为NRF24LXX的CE引脚/ .controller_data= (void)&cs0, }, { .modalias = DEV_NAME_02, .max_speed_hz = 210001000,//最大时钟，需比设备要求的时钟大，暂选2Mhz .bus_num = 0,/exynos4412 的spi0控制器/ .chip_select = EXYNOS4_GPX3(4),/由spi master确定其最大值/ .mode = SPI_MODE_0, .platform_data = (void)EXYNOS4_GPX3(5), /平台数据，作为NRF24LXX的CE引脚/ .controller_data= (void)&cs1, }, }; static int __init demo_init(void) { printk(KERN_INFO"current func is-------------------------------------------%sn",__FUNCTION__); /spi_register_board_info 依照spi_board_info 和spi_master的bus_num比较，匹配成功会生成一个对应的spi_device对象 / return spi_register_board_info(nrf24l01_spi_info,ARRAY_SIZE(nrf24l01_spi_info)); } static void __exit demo_exit(void) { printk(KERN_INFO"current func is-----%sn",__FUNCTION__); } module_init(demo_init); module_exit(demo_exit); MODULE_LICENSE("GPL"); make zImage，启动内核。在sys/bus/spi/devices目录下出现下面spi0.220 spi0.222两个节点其中0表示bus_num,220和222表示我们的static struct spi_board_info nrf24l01_spi_info[0]的.chip_select = EXYNOS4_GPX3(2),//这个宏的值就是220同理222就是EXYNOS4_GPX3(4)，默认内核只创建spi0.0、spi2.0。注意现在只是在内核中创建了spi_device，还没nrf24xx的驱动。nrf24xx_spi_driver就是在STM32程序基础上简单的修修改改就好了，对比Tiny4412和STM32的程序你会发现关于nrf24l01的代码名字是一样的。 ..............................................................下面就直接给出nrf24xx_spi_driver.c的源码......................................................................... #include #include #include #include #include #include #include #include #include #include #include /****************硬件相关的信息*************/ #define DEV_NAME_01 "nrf24xx_spi_01" #define DEV_NAME_02 "nrf24xx_spi_02" #define DEV1_CS_PIN EXYNOS4_GPX3(2) #define DEV2_CS_PIN EXYNOS4_GPX3(4) #define DEV1_CE_PIN EXYNOS4_GPX3(3) #define DEV2_CE_PIN EXYNOS4_GPX3(5) / 片选引脚接在GPX3_2 / struct s3c64xx_spi_csinfo cs0={ .fb_delay = 0, .line = EXYNOS4_GPX3(2),//片选引脚 }; struct s3c64xx_spi_csinfo cs1={ .fb_delay = 0, .line = EXYNOS4_GPX3(4),//片选引脚 }; static struct spi_board_info nrf24l01_spi_info[]={ { .modalias = DEV_NAME_01, .max_speed_hz = 210001000,//最大时钟，需比设备要求的时钟大，暂选2Mhz .bus_num = 0,/exynos4412 的spi0控制器/ .chip_select = EXYNOS4_GPX3(2),/由spi master确定其最大值/ .mode = SPI_MODE_0, .platform_data = (void)EXYNOS4_GPX3(3), /平台数据，作为NRF24LXX的CE引脚/ .controller_data= (void)&cs0, }, { .modalias = DEV_NAME_02, .max_speed_hz = 210001000,//最大时钟，需比设备要求的时钟大，暂选2Mhz .bus_num = 0,/exynos4412 的spi0控制器/ .chip_select = EXYNOS4_GPX3(4),/由spi master确定其最大值/ .mode = SPI_MODE_0, .platform_data = (void)EXYNOS4_GPX3(5), /平台数据，作为NRF24LXX的CE引脚/ .controller_data= (void)&cs1, }, }; static int __init demo_init(void) { printk(KERN_INFO"current func is-------------------------------------------%sn",__FUNCTION__); /spi_register_board_info 依照spi_board_info 和spi_master的bus_num比较，匹配成功会生成一个对应的spi_device对象 / return spi_register_board_info(nrf24l01_spi_info,ARRAY_SIZE(nrf24l01_spi_info)); } static void __exit demo_exit(void) { printk(KERN_INFO"current func is-----%sn",__FUNCTION__); } module_init(demo_init); module_exit(demo_exit); MODULE_LICENSE("GPL"); 就当是记笔记。

2021-12-17 11:11:49 评论举报孙巍

答案对人有帮助，有参考价值 0 编译驱动，并加载模块，在sys/bus/spi/drivers/目录下出现我们的nrf24xxspi驱动，如下图： ..................................................................................下面直接给出STM32的源码......................................................................... #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nrf24xx.h" #define DEVICE_NUM 1 #define GPX3CON 0x11000C60 #define GPX3DAT 0x11000C64 #define DEV_NAME_01 "nrf24xx_spi_01" #define DEV_NAME_02 "nrf24xx_spi_02" #define DEV_NAME DEV_NAME_01 #define DEV1_CS_PIN EXYNOS4_GPX3(2) #define DEV2_CS_PIN EXYNOS4_GPX3(4) #define DEV1_CE_PIN EXYNOS4_GPX3(3) #define DEV2_CE_PIN EXYNOS4_GPX3(5) unsigned char TX_ADDRESS[TX_ADR_WIDTH_5]={0x34,0x43,0x10,0x10,0x01}; //发送地址 unsigned char RX_ADDRESS[TX_ADR_WIDTH_5]={0x34,0x43,0x10,0x10,0x01}; static struct work_struct work; struct timer_list timer; struct spi_device nrf24xx_spi; static int nrf24l01_spi_probe(struct spi_device spi); static int nrf24l01_spi_remove(struct spi_device spi); void Nrf24L10_RX_Mode(void); void Nrf24L10_TX_Mode(void); unsigned char SPI1_ReadBuf(unsigned char reg,unsigned char buf,unsigned char length); unsigned char SPI1_SendBuf(unsigned char reg,unsigned char buf,unsigned char length); unsigned char SPI1_Write_Register(unsigned char reg,unsigned char data); void Active_Nrf24l10(unsigned char cmd); unsigned int SPI1_Read_Reg(unsigned char reg,unsigned char status); unsigned char Nrf24l10_SendBuf(unsigned char* data_buffer, unsigned char length); unsigned char Nrf24l0_ReceiveBuf(unsigned char buf); unsigned char Nrf24l10_Irq(void); char tmp=0,counter =0; static struct spi_driver nrf24l01_spi_driver={ .driver={ .name = DEV_NAME, .bus =&spi_bus_type, .owner = THIS_MODULE, }, .probe = nrf24l01_spi_probe, .remove =__devexit_p(nrf24l01_spi_remove), }; static void timer_function(unsigned long counter) { //printk(KERN_INFO"current func is-----%sn",__FUNCTION__); tmp = tmp?0:1; gpio_set_value(DEV2_CE_PIN,tmp); mod_timer(&timer,jiffies+HZ); schedule_work(&work); } /中断底半部中发送数据/ static void irqBottom(struct work_struct work) { char wbuf[50]={0}; int ret =0; // char reg = EN_AA; counter = counter>30? 0:counter; sprintf(wbuf,"Message Comes From Linux -%d %c",counter,''); counter++; ret = Nrf24l10_SendBuf(wbuf,RX_PLOAD_WIDTH_32);//该函数会导致休眠，不能在中断函数中使用 printk("Message Send to STM3 .......%dn",counter); } static int nrf24l01_spi_probe(struct spi_device spi) { nrf24xx_spi = spi; printk(KERN_INFO"current func is-----%sn",__FUNCTION__); printk(KERN_INFO"max_speed_hz:%dn",spi->max_speed_hz); printk(KERN_INFO"chip_select:%dn",spi->chip_select); INIT_WORK(&work, irqBottom); s3c_gpio_cfgpin(DEV1_CS_PIN, S3C_GPIO_OUTPUT);//设置片选为输出 s3c_gpio_cfgpin(DEV2_CS_PIN, S3C_GPIO_OUTPUT);//设置片选为输出 s3c_gpio_cfgpin(DEV1_CE_PIN, S3C_GPIO_OUTPUT);//设置片选为输出 s3c_gpio_cfgpin(DEV2_CE_PIN, S3C_GPIO_INPUT);//设置片选为输出 Nrf24L10_TX_Mode(); init_timer(&timer);//初始化内核定时器 timer.function = timer_function; add_timer(&timer); return 0; } static int nrf24l01_spi_remove(struct spi_device spi) { printk(KERN_INFO"current func is-----%sn",__FUNCTION__); del_timer(&timer); return 0; } static int __init demo_init(void) { int err; printk(KERN_INFO"current func is-----%sn",__FUNCTION__); err = spi_register_driver(&nrf24l01_spi_driver); return err; } static void __exit demo_exit(void) { printk(KERN_INFO"current func is-----%sn",__FUNCTION__); spi_unregister_driver(&nrf24l01_spi_driver); } module_init(demo_init); module_exit(demo_exit); MODULE_LICENSE("GPL"); void Nrf24L10_RX_Mode(void) { Active_Nrf24l10(0);//进入设置模式 SPI1_SendBuf(WRITE_REG1 + RX_ADDR_P0, RX_ADDRESS, TX_ADR_WIDTH_5); //数据通道0发送地址，最大5个字节 SPI1_Write_Register(WRITE_REG1 + EN_AA, 0x01); // 使能通道0-通道5接收自动应答 SPI1_Write_Register(WRITE_REG1 + EN_RXADDR, 0x01); //接收通道0-5 使能 SPI1_Write_Register(WRITE_REG1 + RF_CH, 40); // 选择射频工作频道0 范围0-127 频道选择寄存器 SPI1_Write_Register(WRITE_REG1+RX_PW_P0,RX_PLOAD_WIDTH_32); SPI1_Write_Register(WRITE_REG1 + RF_SETUP, 0x0f); SPI1_Write_Register(WRITE_REG1 + CONFIG, 0x0f); Active_Nrf24l10(1);//激活发送 } void Nrf24L10_TX_Mode(void) { Active_Nrf24l10(0); SPI1_SendBuf(WRITE_REG1 + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH_5); //数据通道0发送地址，最大5个字节 SPI1_SendBuf(WRITE_REG1 + RX_ADDR_P0, RX_ADDRESS, TX_ADR_WIDTH_5);//数据通道0发送地址，最大5个字节 SPI1_Write_Register(WRITE_REG1 + EN_AA, 0x01);// 使能通道0-通道5接收自动应答 SPI1_Write_Register(WRITE_REG1 + EN_RXADDR, 0x01);//接收通道0-5 使能 SPI1_Write_Register(WRITE_REG1+SETUP_RETR,0x1a); SPI1_Write_Register(WRITE_REG1 + RF_CH, 40);// 选择射频工作频道0 范围0-127 频道选择寄存器 SPI1_Write_Register(WRITE_REG1 + RF_SETUP, 0x0f); SPI1_Write_Register(WRITE_REG1 + CONFIG, 0x0e); Active_Nrf24l10(1); // 使能发送模式 } unsigned int SPI1_Read_Reg(unsigned char reg,unsigned char status) { unsigned char wbuf=reg; struct spi_message m; struct spi_transfer t[2] = { { .tx_buf = &wbuf, .len = 1, }, { .rx_buf = status, .len = 1, }, }; spi_message_init(&m); spi_message_add_tail(&t[0], &m); spi_message_add_tail(&t[1], &m); return spi_sync(nrf24xx_spi, &m); } unsigned char SPI1_Write_Register(unsigned char reg,unsigned char data) { unsigned char wbuf[2]={0}; struct spi_message m; struct spi_transfer t = { .tx_buf = wbuf, .len = 2, }; //printk(KERN_INFO"current func is-----%sn",__FUNCTION__); wbuf[0]=reg; wbuf[1]=data; spi_message_init(&m); spi_message_add_tail(&t, &m); return spi_sync(nrf24xx_spi, &m); } / SPI1发送一个缓冲区 / unsigned char SPI1_SendBuf(unsigned char reg,unsigned char buf,unsigned char length) { struct spi_message m; unsigned char wbuf=reg; struct spi_transfer t[2] = { { .tx_buf = &wbuf, .len = 1, }, { .tx_buf = buf, .len = length, }, }; spi_message_init(&m); spi_message_add_tail(&t[0], &m); spi_message_add_tail(&t[1], &m); return spi_sync(nrf24xx_spi, &m); } unsigned char SPI1_ReadBuf(unsigned char reg,unsigned char buf,unsigned char length) { unsigned char wbuf=reg; struct spi_message m; struct spi_transfer t[2] = { { .tx_buf = &wbuf, .len = 1, }, { .rx_buf = buf, .len = length, } }; spi_message_init(&m); spi_message_add_tail(&t[0], &m); spi_message_add_tail(&t[1], &m); return spi_sync(nrf24xx_spi, &m); } void Active_Nrf24l10(unsigned char cmd) { gpio_set_value(DEV2_CE_PIN,cmd); } unsigned char Nrf24l0_ReceiveBuf(unsigned char buf) { unsigned char status = 0; SPI1_Read_Reg(STATUS,&status); SPI1_Write_Register(WRITE_REG1 +STATUS ,status);//清除相应的标志位 if(status & RX_OK) { SPI1_ReadBuf(RD_RX_PLOAD,buf,RX_PLOAD_WIDTH_32); SPI1_Write_Register(FLUSH_RX,0xff); return RX_OK; //接收成功返回RX_OK } return OTHER_ERROR; } unsigned char Nrf24l10_SendBuf(unsigned char* data_buffer, unsigned char length) { unsigned char status = 0; Active_Nrf24l10(0); SPI1_SendBuf(WR_TX_PLOAD,data_buffer,TX_PLOAD_WIDTH_32);//写数据到TX BUF 32个字节 // SPI1_SendBuf(WR_TX_PLOAD,data_buffer,length);//写数据到TX BUF 32个字节 Active_Nrf24l10(1); while(1 == Nrf24l10_Irq())//等待发送完成事件 { //printk("Nrf24l10_Irq..............n"); schedule_timeout(HZ/50);//HZ=100 , 每10ms jiffies+1 } SPI1_Read_Reg(STATUS,&status); SPI1_Write_Register(WRITE_REG1 +STATUS ,status);//清除相应的标志位 if(status & TX_OK) { return TX_OK; //接收成功返回RX_OK }else if(status & MAX_RET_FLAG) { SPI1_Write_Register(FLUSH_TX,0xff); return MAX_RET_FLAG; //否则返回ERROR } return OTHER_ERROR; } unsigned char Nrf24l10_Irq(void) { return gpio_get_value(DEV2_CE_PIN); } 新手整整搞了3天才调通，还有有些地方说的不好，见谅。

2021-12-17 11:12:50 评论举报李万寿