Mini2440 NRF24L01無線模塊驅(qū)動(dòng)
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NRF24L01使用SPI總線與主機(jī)通信，沒有SPI端口的設(shè)備可以使用IO口進(jìn)行模擬。
本文引用地址：http://www.2s4d.com/article/201611/318111.htm關(guān)于SPI：
SPI是一種四線串行總線，
SCLK： 串行時(shí)鐘線
MOSI： 總線主機(jī)輸出/ 從機(jī)輸入
MISO： 總線主機(jī)輸入/ 從機(jī)輸出;
SS： 從機(jī)使能數(shù)據(jù)傳輸方式
通訊是通過數(shù)據(jù)交換完成的，這里先要知道SPI是串行通訊協(xié)議，也就是說數(shù)據(jù)是一位一位的傳輸?shù)?。這就是SCLK時(shí)鐘線存在的原因，由SCK提供時(shí)鐘脈沖，SDI，SDO則基于此脈沖完成數(shù)據(jù)傳輸。數(shù)據(jù)輸出通過 SDO線，數(shù)據(jù)在時(shí)鐘上升沿或下降沿時(shí)改變，在緊接著的下降沿或上升沿被讀取。完成一位數(shù)據(jù)傳輸，輸入也使用同樣原理。這樣，在至少8次時(shí)鐘信號(hào)的改變（上沿和下沿為一次），就可以完成8位數(shù)據(jù)的傳輸。
NRF24L01寄存器說明：
還是看說明書吧，dbank驅(qū)動(dòng)源碼在下一頁。驅(qū)動(dòng)源碼：
#include #include #include #include #include #include
#include#include#include#include#include#include#include#include#include#include
typedef unsigned int uint16;
typedef unsigned char uint8;
/* 引腳相關(guān)定義 */
#define CSN S3C2410_GPF(4)
#define CSN_OUTP S3C2410_GPIO_OUTPUT
#define MOSI S3C2410_GPG(0)
#define MOSI_OUTP S3C2410_GPIO_OUTPUT
#define IRQ S3C2410_GPG(1)
#define IRQ_INP S3C2410_GPIO_INPUT
#define MISO S3C2410_GPG(6)
#define MISO_INP S3C2410_GPIO_INPUT
#define SCK S3C2410_GPG(7)
#define SCK_OUTP S3C2410_GPIO_OUTPUT
#define CE S3C2410_GPG(11)
#define CE_OUTP S3C2410_GPIO_OUTPUT
#define DEVICE_NAME “NRF24L01”
#define TxBufSize 32
uint8 TxBuf[TxBufSize] = {
0x01, 0x02, 0x03, 0x4, 0x05, 0x06, 0x07, 0x08,
0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
0x17, 0x18, 0x19, 0x20, 0x21, 0x22, 0x23, 0x24,
0x25, 0x26, 0x27, 0x28, 0x29, 0x30, 0x31, 0x32,
};
//NRF24L01端口定義
#define CE_OUT s3c2410_gpio_cfgpin(CE, CE_OUTP) //數(shù)據(jù)線設(shè)置為輸出
#define CE_UP s3c2410_gpio_pullup(CE, 1) //打開上拉電阻
#define CE_L s3c2410_gpio_setpin(CE, 0) //拉低數(shù)據(jù)線電平
#define CE_H s3c2410_gpio_setpin(CE, 1) //拉高數(shù)據(jù)線電平
#define SCK_OUT s3c2410_gpio_cfgpin(SCK, SCK_OUTP) //數(shù)據(jù)線設(shè)置為輸出
#define SCK_H s3c2410_gpio_setpin(SCK, 1) //拉高數(shù)據(jù)線電平
#define SCK_L s3c2410_gpio_setpin(SCK, 0) //拉高數(shù)據(jù)線電平
#define MISO_IN s3c2410_gpio_cfgpin(MISO, MISO_INP) //數(shù)據(jù)線設(shè)置為輸出
#define MISO_UP s3c2410_gpio_pullup(MISO, 1) //打開上拉電阻
#define MISO_STU s3c2410_gpio_getpin(MISO) //數(shù)據(jù)狀態(tài)
#define IRQ_IN s3c2410_gpio_cfgpin(IRQ, IRQ_INP) //數(shù)據(jù)線設(shè)置為輸出
#define IRQ_UP s3c2410_gpio_pullup(IRQ, 1) //打開上拉電阻
#define IRQ_L s3c2410_gpio_setpin(IRQ, 0) //拉低數(shù)據(jù)線電平
#define IRQ_H s3c2410_gpio_setpin(IRQ, 1) //拉高數(shù)據(jù)線電平
#define MOSI_OUT s3c2410_gpio_cfgpin(MOSI, MOSI_OUTP) //數(shù)據(jù)線設(shè)置為輸出
#define MOSI_UP s3c2410_gpio_pullup(MOSI, 1) //打開上拉電阻
#define MOSI_L s3c2410_gpio_setpin(MOSI, 0) //拉低數(shù)據(jù)線電平
#define MOSI_H s3c2410_gpio_setpin(MOSI, 1) //拉高數(shù)據(jù)線電平
#define CSN_OUT s3c2410_gpio_cfgpin(CSN, CSN_OUTP) //數(shù)據(jù)線設(shè)置為輸出
#define CSN_UP s3c2410_gpio_pullup(CSN, 1) //打開上拉電阻
#define CSN_L s3c2410_gpio_setpin(CSN, 0) //拉低數(shù)據(jù)線電平
#define CSN_H s3c2410_gpio_setpin(CSN, 1) //拉高數(shù)據(jù)線電平
//NRF24L01
#define TX_ADR_WIDTH 5 // 5 uint8s TX address width
#define RX_ADR_WIDTH 5 // 5 uint8s RX address width
#define TX_PLOAD_WIDTH 32 // 20 uint8s TX payload
#define RX_PLOAD_WIDTH 32 // 20 uint8s TX payload
uint8 TX_ADDRESS[TX_ADR_WIDTH] = { 0x34, 0x43, 0x10, 0x10, 0x01 }; //本地地址
uint8 RX_ADDRESS[RX_ADR_WIDTH] = { 0x34, 0x43, 0x10, 0x10, 0x01 }; //接收地址
//NRF24L01寄存器指令
#define READ_REG 0x00 // 讀寄存器指令
#define WRITE_REG 0x20 // 寫寄存器指令
#define RD_RX_PLOAD 0x61 // 讀取接收數(shù)據(jù)指令
#define WR_TX_PLOAD 0xA0 // 寫待發(fā)數(shù)據(jù)指令
#define FLUSH_TX 0xE1 // 沖洗發(fā)送 FIFO指令
#define FLUSH_RX 0xE2 // 沖洗接收 FIFO指令
#define REUSE_TX_PL 0xE3 // 定義重復(fù)裝載數(shù)據(jù)指令
#define NOP 0xFF // 保留
//SPI(nRF24L01)寄存器地址
#define CONFIG 0x00 // 配置收發(fā)狀態(tài)，CRC校驗(yàn)?zāi)Ｊ揭约笆瞻l(fā)狀態(tài)響應(yīng)方式
#define EN_AA 0x01 // 自動(dòng)應(yīng)答功能設(shè)置
#define EN_RXADDR 0x02 // 可用信道設(shè)置
#define SETUP_AW 0x03 // 收發(fā)地址寬度設(shè)置
#define SETUP_RETR 0x04 // 自動(dòng)重發(fā)功能設(shè)置
#define RF_CH 0x05 // 工作頻率設(shè)置
#define RF_SETUP 0x06 // 發(fā)射速率、功耗功能設(shè)置
#define STATUS 0x07 // 狀態(tài)寄存器
#define OBSERVE_TX 0x08 // 發(fā)送監(jiān)測(cè)功能
#define CD 0x09 // 地址檢測(cè)
#define RX_ADDR_P0 0x0A // 頻道0接收數(shù)據(jù)地址
#define RX_ADDR_P1 0x0B // 頻道1接收數(shù)據(jù)地址
#define RX_ADDR_P2 0x0C // 頻道2接收數(shù)據(jù)地址
#define RX_ADDR_P3 0x0D // 頻道3接收數(shù)據(jù)地址
#define RX_ADDR_P4 0x0E // 頻道4接收數(shù)據(jù)地址
#define RX_ADDR_P5 0x0F // 頻道5接收數(shù)據(jù)地址
#define TX_ADDR 0x10 // 發(fā)送地址寄存器
#define RX_PW_P0 0x11 // 接收頻道0接收數(shù)據(jù)長(zhǎng)度
#define RX_PW_P1 0x12 // 接收頻道0接收數(shù)據(jù)長(zhǎng)度
#define RX_PW_P2 0x13 // 接收頻道0接收數(shù)據(jù)長(zhǎng)度
#define RX_PW_P3 0x14 // 接收頻道0接收數(shù)據(jù)長(zhǎng)度
#define RX_PW_P4 0x15 // 接收頻道0接收數(shù)據(jù)長(zhǎng)度
#define RX_PW_P5 0x16 // 接收頻道0接收數(shù)據(jù)長(zhǎng)度
#define FIFO_STATUS 0x17 // FIFO棧入棧出狀態(tài)寄存器設(shè)置
/* 打開計(jì)數(shù) */
uint open_count = 0;
/* 狀態(tài)標(biāo)識(shí) */
uint8 receive_state;
int get_data=0;
wait_queue_head_t read_queue; //讀取等待隊(duì)列
#define RX_DR 6
#define TX_DS 5
#define MAX_RT 4
/* unit8 SPI_RW(uint8 tmp)
* SPI寫時(shí)序,寫一個(gè)字節(jié)到MOSI同時(shí)從MISO中讀取一個(gè)字節(jié) */
uint8 SPI_RW(uint8 tmp)
{ uint8 bit_ctl;
for (bit_ctl = 0; bit_ctl < 8;bit_ctl++){
if(tmp & 0x80)
MOSI_H;
else
MOSI_L;
tmp = tmp << 1; //Shift next bit into MSB
SCK_H; //Set SCK high
ndelay(60);
tmp |= MISO_STU; //Capture current MISO bit
SCK_L;
ndelay(60);
}
return tmp;
}
/*
* 函數(shù)：uint8 SPI_Read(uint8 reg)
* 功能：NRF24L01的SPI時(shí)序
*/
uint8 SPI_Read(uint8 reg)
{ uint8 reg_val;
CSN_L; // CSN low, initialize SPI communication…
ndelay(60);
SPI_RW(reg); // Select register to read from..
reg_val = SPI_RW(0); // ..then read registervalue
CSN_H; // CSN high, terminate SPI communication
ndelay(60);
return (reg_val); // return register value
}
//功能：NRF24L01讀寫寄存器函數(shù)
uint8 SPI_RW_Reg(uint8 reg, uint8 value)
{ uint8 status;
CSN_L; // CSN low, init SPI transaction
ndelay(60);
status = SPI_RW(reg); // select register
SPI_RW(value); // ..and write value to it..
CSN_H; // CSN high again
ndelay(60);
return (status); // return nRF24L01 status uint8
}
//函數(shù)：uint8 SPI_Read_Buf(uint8 reg, uint8 *pBuf, uint8 uchars)
//功能: 用于讀數(shù)據(jù)，reg：為寄存器地址，pBuf：為待讀出數(shù)據(jù)地址，uchars：讀出數(shù)據(jù)的個(gè)數(shù)
uint8 SPI_Read_Buf(uint8 reg, uint8 * pBuf, uint8 uchars)
{ uint8 status, uint8_ctr;
CSN_L; // Set CSN low, init SPI tranaction
ndelay(60);
status = SPI_RW(reg); // Select register to write to and read status uint8
for (uint8_ctr = 0; uint8_ctr < uchars; uint8_ctr++) {
pBuf[uint8_ctr] = SPI_RW(0); //
ndelay(20);
}
CSN_H;
ndelay(60);
return (status); // return nRF24L01 status uint8
}
//函數(shù)：uint8 SPI_Write_Buf(uint8 reg, uint8 *pBuf, uint8 uchars)
//功能: 用于寫數(shù)據(jù)：為寄存器地址，pBuf：為待寫入數(shù)據(jù)地址，uchars：寫入數(shù)據(jù)的個(gè)數(shù)
uint8 SPI_Write_Buf(uint8 reg, uint8 * pBuf, uint8 uchars)
{ uint8 status, uint8_ctr;
CSN_L; //SPI使能
ndelay(60);
status = SPI_RW(reg);
for (uint8_ctr = 0; uint8_ctr < uchars; uint8_ctr++) //
{
SPI_RW(*pBuf++);
ndelay(20);
}
CSN_H; //關(guān)閉SPI
ndelay(60);
return (status); //
}
//函數(shù)：void SetRX_Mode(void)
//功能：數(shù)據(jù)接收配置
void SetRX_Mode(void)
{
CE_L;
ndelay(60);
// SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // IRQ收發(fā)完成中斷響應(yīng)，16位CRC ，主接收
//udelay(1);
CE_H;
udelay(130);
}
//函數(shù)：unsigned char nRF24L01_RxPacket(unsigned char* rx_buf)
//功能：數(shù)據(jù)讀取后放如rx_buf接收緩沖區(qū)中
unsigned char nRF24L01_RxPacket(unsigned char *rx_buf)
{ unsigned char revale = 0;
receive_state = SPI_Read(STATUS); // 讀取狀態(tài)寄存其來判斷數(shù)據(jù)接收狀況
if (receive_state & (1 << RX_DR)) // 判斷是否接收到數(shù)據(jù)
{
CE_L; //SPI使能
udelay(50);
SPI_Read_Buf(RD_RX_PLOAD, rx_buf, TX_PLOAD_WIDTH); // read receive payload from RX_FIFO buffer
revale = 1; //讀取數(shù)據(jù)完成標(biāo)志
}
SPI_RW_Reg(WRITE_REG + STATUS, receive_state); //接收到數(shù)據(jù)后RX_DR,TX_DS,MAX_PT都置高為1，通過寫1來清楚中斷標(biāo)志
return revale;
}
//函數(shù)：void nRF24L01_TxPacket(unsigned char * tx_buf)
//功能：發(fā)送 tx_buf中數(shù)據(jù)
void nRF24L01_TxPacket(unsigned char *tx_buf)
{ uint8 ret;
CE_L; //StandBy I模式
ndelay(60);
ret=SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH); // 裝載接收端地址
printk(“ret=%cn”,ret);
ret=SPI_Write_Buf(WR_TX_PLOAD, tx_buf, TX_PLOAD_WIDTH); // 裝載數(shù)據(jù)
printk(“ret=%cn”,ret);
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e); // IRQ收發(fā)完成中斷響應(yīng)，16位CRC，主發(fā)送
CE_H; //置高CE，激發(fā)數(shù)據(jù)發(fā)送
udelay(10);
}
static irqreturn_t nrf24l01_interrupt(int irq,void *dev_id)
{ uint8 state ;
state = SPI_Read(STATUS);
if(state & 0x10){
SPI_RW_Reg(WRITE_REG + STATUS , state); //如果是重發(fā)中斷則寫回清除中斷
}else if(state & 0x20){
SPI_RW_Reg(WRITE_REG + STATUS , state); //清除發(fā)送中斷
}else if ( state & 0x40){
get_data = 1;
nRF24L01_RxPacket(TxBuf);
wake_up_interruptible(&read_queue);
}
return IRQ_RETVAL(IRQ_HANDLED);
}
uint8 init_NRF24L01(void)
{ MISO_UP;
CE_OUT;
CSN_OUT;
SCK_OUT;
MOSI_OUT;
MISO_IN;
IRQ_IN;
udelay(500);
CE_L; // chip enable
ndelay(60);
CSN_H; // Spi disable
ndelay(60);
SCK_L; // Spi clock line init high
ndelay(60);
SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // 寫本地地址
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH); // 寫接收端地址
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // 頻道0自動(dòng) ACK應(yīng)答允許
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // 允許接收地址只有頻道0，如果需要多頻道可以參考Page21
SPI_RW_Reg(WRITE_REG + RF_CH, 0); // 設(shè)置信道工作為2.4GHZ，收發(fā)必須一致
SPI_RW_Reg(WRITE_REG + RX_PW_P0, RX_PLOAD_WIDTH); //設(shè)置接收數(shù)據(jù)長(zhǎng)度，本次設(shè)置為32字節(jié)
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); //設(shè)置發(fā)射速率為1MHZ，發(fā)射功率為最大值0dB
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // IRQ收發(fā)完成中斷響應(yīng)，16位CRC ，主接收
mdelay(1000);
nRF24L01_TxPacket(TxBuf);
SPI_RW_Reg(WRITE_REG + STATUS, 0XFF);
printk(“test 1 n”);
mdelay(1000);
return 1;
}
static uint16 nrf24l01_poll(struct file *filp,struct poll_table_struct *wait)
{ uint16 mask = 0;
poll_wait(filp,&read_queue,wait);
if(get_data){
mask |= POLLIN|POLLRDNORM;
}
return mask;
} static ssize_t nrf24l01_write(struct file *filp,const char *buffer, size_t count,loff_t *ppos)
{ if(copy_from_user(TxBuf,buffer,count))
{
printk(“Can’t Send Data !”);
return -EFAULT;
}
nRF24L01_TxPacket(TxBuf);
SPI_RW_Reg(WRITE_REG + STATUS,0XFF);
printk(“Send OK n”);
return 10;
}
static ssize_t nrf24l01_read(struct file * filp,char *buffer,size_t count,loff_t *ppos)
{ unsigned long err;
if(!get_data){
if(filp->f_flags & O_NONBLOCK)
return -EAGAIN;
else
wait_event_interruptible(read_queue,get_data);
}
get_data = 0;
err = copy_to_user(buffer,TxBuf,min(TxBufSize,count));
printk(“read okn”);
return err ? -EFAULT : min(TxBufSize,count);
}
static int nrf24l01_open(struct inode *node, struct file *file)
{ uint8 flag = 0;
unsigned long err;
if (open_count == 1)
return -EBUSY;
flag = init_NRF24L01();
mdelay(100);
init_waitqueue_head(&read_queue);
err = request_irq(IRQ_EINT9,nrf24l01_interrupt,IRQ_TYPE_EDGE_FALLING,DEVICE_NAME,NULL);
if(err){
disable_irq(IRQ_EINT9);
free_irq(IRQ_EINT9,NULL);
}
if (flag == 0) {
printk(“uable to open device!n”);
return -1;
} else {
open_count++;
printk(“device opened !n”);
return 0;
}
}
static int nrf24l01_release(struct inode *node, struct file *file)
{ free_irq(IRQ_EINT9,NULL);
open_count–;
printk(DEVICE_NAME ” released !n”);
return 0;
}
static struct file_operations nrf24l01_fops = {
.owner = THIS_MODULE,
.open = nrf24l01_open,
.write = nrf24l01_write,
.poll = nrf24l01_poll,
.read = nrf24l01_read,
.release = nrf24l01_release,
};
static struct miscdevice nrf24l01_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &nrf24l01_fops,
};
static int __init nrf24l01_init(void)
{ int ret;
printk(“Initial driver for NRF24L01.n”);
ret = misc_register(&nrf24l01_dev);
mdelay(10);
if (ret < 0) {
printk(DEVICE_NAME ” can’t register major numbern”);
return ret;
} else {
printk(DEVICE_NAME ” register successn”);
return 0;
}
}
static void __exit nrf24l01_exit(void)
{ misc_deregister(&nrf24l01_dev);
printk(“NRF24L01 unregister success n”);
}
module_init(nrf24l01_init);
module_exit(nrf24l01_exit);
MODULE_AUTHOR(“Issac”);
MODULE_DESCRIPTION(“NRF24L01 Driver”);
MODULE_LICENSE(“GPL”);備注：不同管腳的定義可以自行修改。
我添加了poll方法 和接收中斷的處理
由于MSP的程序沒有調(diào)好，這個(gè)驅(qū)動(dòng)還沒有進(jìn)行測(cè)試。在內(nèi)核中部署驅(qū)動(dòng)：
將nrf24l01.c文件到源碼下driver/misc/ 目錄下
修改該目錄下的Kconfig文件
在合適位置添加
config NRF24L01tristate "NRF24L01 Single Chip 2.4 GHz Radio Transceiver"helpDriver for NRF24L01
修改Makefile添加
obj-$(CONFIG_NRF24L01) += nrf24l01.o然后make menuconfig
選上NRF24L01 驅(qū)動(dòng)即可
測(cè)試程序：僅測(cè)試了發(fā)送
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
unsigned char TxBuf[32] = {
0x01, 0x02, 0x03, 0x4, 0x05, 0x06, 0x07, 0x08,
0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
0x17, 0x18, 0x19, 0x20, 0x21, 0x22, 0x23, 0x24,
0x25, 0x26, 0x27, 0x28, 0x29, 0x30, 0x31, 0x32,
};
int main(void)
{
int fd = -1;
int ret;
int count = 1;
fd = open(“/dev/NRF24L01”, O_RDWR);
if(fd < 0)
{
perror(“Can’t open /dev/nrf24l01 n”);
exit(1);
}
printf(“open /dev/nrf24l01 success n”);
while(count <= 5)
{
ret = write(fd, TxBuf , sizeof(TxBuf));
char *mesg = strerror(errno);
printf(“Sending %d time %d n”, count,ret);
printf(“Errno:%dn,Mesg:%sn”,errno,mesg);
usleep(100*1000);
count++;
}
close(fd);
}
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