void NRF905_Send_Data(uint8_t *data, uint8_t length);用这个函数送char buf2[32]="receive";怎么写

假设你想要发送的数据是ASCII字符串 "receive"，你可以这样调用该函数：

char buf2[32] = "receive";
NRF905_Send_Data((uint8_t*)buf2, strlen(buf2));

在这个例子中，我们将 `buf2` 强制转换为 `uint8_t*` 类型，因为 `NRF905_Send_Data()` 函数接受的参数是 `uint8_t*` 类型。同时，我们使用 `strlen()` 函数来获取 `buf2` 的长度，这样可以确保只发送 "receive" 这个字符串的实际长度。

相关问题

通过nrf905实现两个stm32f103c8t6通信的程序

首先，需要连接nRF905模块到每个STM32F103C8T6上。连接方式如下：

nRF905模块 | STM32F103C8T6
---|---
GND | GND
VCC | 3.3V
CE | PB1
TX_EN | PB0
PWR | 3.3V
DR | PB10
CSN | PB12
MOSI | PB15
MISO | PB14
SCK | PB13

接下来，我们可以使用SPI总线来与nRF905模块进行通信。以下是一个简单的例子程序，可以在两个STM32F103C8T6之间实现通信。

#include "stm32f10x.h"
#include "nrf905.h"

int main(void)
{
    // 初始化nRF905模块
    nrf905_init();

    while(1)
    {
        // 发送数据
        uint8_t data[4] = {0x01, 0x02, 0x03, 0x04};
        nrf905_send_data(data, 4);

        // 等待接收数据
        uint8_t buf[32];
        uint8_t len = nrf905_receive_data(buf, 32);
        if(len > 0)
        {
            // 处理接收到的数据
        }
    }
}

在上面的例子中，我们使用nrf905_init()函数初始化nRF905模块，并使用nrf905_send_data()函数发送数据。使用nrf905_receive_data()函数接收数据。注意，nRF905模块可以工作在不同的频段，所以需要根据需要设置频段。可以使用nrf905_set_frequency()函数设置频段。

完整的程序代码如下：

#include "stm32f10x.h"
#include "nrf905.h"

void delay_ms(uint32_t ms)
{
    for(uint32_t i = 0; i < ms; i++)
    {
        for(uint32_t j = 0; j < 2000; j++)
        {
            __NOP();
        }
    }
}

int main(void)
{
    // 初始化nRF905模块
    nrf905_init();

    while(1)
    {
        // 发送数据
        uint8_t data[4] = {0x01, 0x02, 0x03, 0x04};
        nrf905_send_data(data, 4);

        // 等待接收数据
        uint8_t buf[32];
        uint8_t len = nrf905_receive_data(buf, 32);
        if(len > 0)
        {
            // 处理接收到的数据
        }

        delay_ms(1000);
    }
}

其中nrf905.c和nrf905.h文件的代码如下：

#include "nrf905.h"
#include "spi.h"

void nrf905_init(void)
{
    // 初始化SPI总线
    spi_init();

    // 设置nRF905模块为TX模式
    nrf905_set_tx_mode();

    // 设置频段为433MHz
    nrf905_set_frequency(NRF905_FREQUENCY_433);

    // 设置发送地址
    uint8_t addr[4] = {0x34, 0x43, 0x10, 0x10};
    nrf905_set_tx_address(addr);

    // 设置接收地址
    uint8_t rx_addr[4] = {0x34, 0x43, 0x10, 0x10};
    nrf905_set_rx_address(rx_addr);

    // 设置数据速率为1MBPS
    nrf905_set_data_rate(NRF905_DATA_RATE_1MBPS);
}

void nrf905_set_frequency(nrf905_frequency_t frequency)
{
    uint8_t freq = (uint8_t)frequency;
    nrf905_write_register(NRF905_REG_CHANNEL, freq);
}

void nrf905_set_tx_address(uint8_t* addr)
{
    nrf905_write_register(NRF905_REG_TX_ADDRESS, addr[0]);
    nrf905_write_register(NRF905_REG_TX_ADDRESS + 1, addr[1]);
    nrf905_write_register(NRF905_REG_TX_ADDRESS + 2, addr[2]);
    nrf905_write_register(NRF905_REG_TX_ADDRESS + 3, addr[3]);
}

void nrf905_set_rx_address(uint8_t* addr)
{
    nrf905_write_register(NRF905_REG_RX_ADDRESS, addr[0]);
    nrf905_write_register(NRF905_REG_RX_ADDRESS + 1, addr[1]);
    nrf905_write_register(NRF905_REG_RX_ADDRESS + 2, addr[2]);
    nrf905_write_register(NRF905_REG_RX_ADDRESS + 3, addr[3]);
}

void nrf905_set_data_rate(nrf905_data_rate_t data_rate)
{
    uint8_t rate = (uint8_t)data_rate;
    nrf905_write_register(NRF905_REG_CONFIG, rate);
}

void nrf905_set_tx_mode(void)
{
    nrf905_write_register(NRF905_REG_CONFIG, NRF905_CONFIG_TX);
}

void nrf905_set_rx_mode(void)
{
    nrf905_write_register(NRF905_REG_CONFIG, NRF905_CONFIG_RX);
}

void nrf905_send_data(uint8_t* data, uint8_t len)
{
    // 设置为TX模式
    nrf905_set_tx_mode();

    // 清空发送缓冲区
    nrf905_write_register(NRF905_REG_TX_PAYLOAD_SIZE, len);
    nrf905_write_register_buffer(NRF905_REG_TX_PAYLOAD, data, len);

    // 启动发送
    nrf905_write_register(NRF905_REG_CONFIG, NRF905_CONFIG_TX_START);

    // 等待发送完成
    while(nrf905_read_register(NRF905_REG_CONFIG) & NRF905_CONFIG_TX_START) {}

    // 设置为RX模式
    nrf905_set_rx_mode();
}

uint8_t nrf905_receive_data(uint8_t* buf, uint8_t len)
{
    uint8_t payload_size = nrf905_read_register(NRF905_REG_RX_PAYLOAD_SIZE);
    if(payload_size > len)
    {
        payload_size = len;
    }

    nrf905_read_register_buffer(NRF905_REG_RX_PAYLOAD, buf, payload_size);

    // 清除中断标志位
    nrf905_write_register(NRF905_REG_STATUS, NRF905_STATUS_RX_DR);

    return payload_size;
}

void nrf905_write_register(uint8_t reg, uint8_t value)
{
    // 选择寄存器
    nrf905_cs_low();
    spi_transfer(NRF905_COMMAND_W_REGISTER | reg);

    // 写入数据
    spi_transfer(value);

    // 取消选择寄存器
    nrf905_cs_high();
}

void nrf905_write_register_buffer(uint8_t reg, uint8_t* buffer, uint8_t len)
{
    // 选择寄存器
    nrf905_cs_low();
    spi_transfer(NRF905_COMMAND_W_REGISTER | reg);

    // 写入数据
    for(uint8_t i = 0; i < len; i++)
    {
        spi_transfer(buffer[i]);
    }

    // 取消选择寄存器
    nrf905_cs_high();
}

uint8_t nrf905_read_register(uint8_t reg)
{
    // 选择寄存器
    nrf905_cs_low();
    spi_transfer(NRF905_COMMAND_R_REGISTER | reg);

    // 读取数据
    uint8_t value = spi_transfer(0x00);

    // 取消选择寄存器
    nrf905_cs_high();

    return value;
}

void nrf905_read_register_buffer(uint8_t reg, uint8_t* buffer, uint8_t len)
{
    // 选择寄存器
    nrf905_cs_low();
    spi_transfer(NRF905_COMMAND_R_REGISTER | reg);

    // 读取数据
    for(uint8_t i = 0; i < len; i++)
    {
        buffer[i] = spi_transfer(0x00);
    }

    // 取消选择寄存器
    nrf905_cs_high();
}

uint8_t spi_transfer(uint8_t value)
{
    // 发送数据
    SPI_I2S_SendData(SPI1, value);

    // 等待传输完成
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

    // 读取数据
    return SPI_I2S_ReceiveData(SPI1);
}

void spi_init(void)
{
    // 使能GPIOB时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    // 使能SPI1时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    // 配置SPI1的SCK、MISO、MOSI引脚
    GPIO_InitTypeDef gpio_init;
    gpio_init.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
    gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOB, &gpio_init);

    // 配置nRF905模块的CE、TX_EN、DR、CSN引脚
    gpio_init.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_10 | GPIO_Pin_12;
    gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
    gpio_init.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(GPIOB, &gpio_init);

    // 配置CSN引脚为高电平
    nrf905_cs_high();

    // 配置SPI1
    SPI_InitTypeDef spi_init;
    spi_init.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    spi_init.SPI_Mode = SPI_Mode_Master;
    spi_init.SPI_DataSize = SPI_DataSize_8b;
    spi_init.SPI_CPOL = SPI_CPOL_Low;
    spi_init.SPI_CPHA = SPI_CPHA_1Edge;
    spi_init.SPI_NSS = SPI_NSS_Soft;
    spi_init.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
    spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_Init(SPI1, &spi_init);

    // 使能SPI1
    SPI_Cmd(SPI1, ENABLE);
}

void nrf905_cs_low(void)
{
    GPIO_ResetBits(GPIOB, GPIO_Pin_12);
}

void nrf905_cs_high(void)
{
    GPIO_SetBits(GPIOB, GPIO_Pin_12);
}

其中nrf905.h文件的代码如下：

#ifndef __NRF905_H
#define __NRF905_H

#include "stdint.h"

#define NRF905_REG_CHANNEL          0x00
#define NRF905_REG_CONFIG           0x01
#define NRF905_REG_TX_PAYLOAD_SIZE  0x02
#define NRF905_REG_RX_PAYLOAD_SIZE  0x03
#define NRF905_REG_RX_ADDRESS       0x04
#define NRF905_REG_TX_ADDRESS       0x08
#define NRF905_REG_RX_PAYLOAD       0x09
#define NRF905_REG_TX_PAYLOAD       0x20
#define NRF905_REG_STATUS           0x07

#define NRF905_COMMAND_R_REGISTER   0x00
#define NRF905_COMMAND_W_REGISTER   0x20

#define NRF905_CONFIG_PWR_UP        (1 << 7)
#define NRF905_CONFIG_CRC_EN        (1 << 6)
#define NRF905_CONFIG_CRC_MODE      (1 << 5)
#define NRF905_CONFIG_TX            (1 << 4)
#define NRF905_CONFIG_RX            (0 << 4)
#define NRF905_CONFIG_TX_START      (1 << 3)

typedef enum {
    NRF905_FREQUENCY_433 = 0x00,
    NRF905_FREQUENCY_868 = 0x20,
    NRF905_FREQUENCY_915 = 0x40,
} nrf905_frequency_t;

typedef enum {
    NRF905_DATA_RATE_50KBPS = 0x00,
    NRF905_DATA_RATE_100KBPS = 0x02,
    NRF905_DATA_RATE_200KBPS = 0x04,
    NRF905_DATA_RATE_400KBPS = 0x06,
    NRF905_DATA_RATE_1MBPS = 0x08,
} nrf905_data_rate_t;

void nrf905_init(void);
void nrf905_set_frequency(nrf905_frequency_t frequency);
void nrf905_set_tx_address(uint8_t* addr);
void nrf905_set_rx_address(uint8_t* addr);
void nrf905_set_data_rate(nrf905_data_rate_t data_rate);
void nrf905_set_tx_mode(void);
void nrf905_set_rx_mode(void);
void nrf905_send_data(uint8_t* data, uint8_t len);
uint8_t nrf905_receive_data(uint8_t* buf, uint8_t len);
void nrf905_write_register(uint8_t reg, uint8_t value);
void nrf905_write_register_buffer(uint8_t reg, uint8_t* buffer, uint8_t len);
uint8_t nrf905_read_register(uint8_t reg);
void nrf905_read_register_buffer(uint8_t reg, uint8_t* buffer, uint8_t len);
void nrf905_cs_low(void);
void nrf905_cs_high(void);

#endif

需要注意的是，以上代码仅为示例代码，需要根据具体的应用场景进行修改。例如，可以根据需要设置不同的频段、数据速率、发送地址、接收地址等参数。

nrf905.c和nrf905.h怎么写？

nrf905.c和nrf905.h是nRF905无线收发器的驱动程序文件，以下是简单的示例代码：

nrf905.h

#ifndef __NRF905_H
#define __NRF905_H

#include <stdint.h>

#define NRF905_CHANNEL_MAX 83

typedef struct {
    uint8_t *tx_buf;
    uint8_t *rx_buf;
    uint32_t tx_buf_size;
    uint32_t rx_buf_size;
    uint8_t channel;
    uint32_t spi_speed_hz;
    uint8_t spi_mode;
    uint8_t ce_pin;
    uint8_t txen_pin;
    uint8_t pwr_pin;
} nrf905_t;

int nrf905_init(nrf905_t *dev);
int nrf905_set_channel(nrf905_t *dev, uint8_t channel);
int nrf905_set_tx_address(nrf905_t *dev, uint8_t *address);
int nrf905_send(nrf905_t *dev, uint8_t *data, uint32_t len);
int nrf905_receive(nrf905_t *dev, uint8_t *data, uint32_t len);

#endif /* __NRF905_H */

nrf905.c

#include "nrf905.h"
#include "spi.h"
#include "gpio.h"

#define NRF905_SPI_MODE_0 0
#define NRF905_SPI_MODE_1 1
#define NRF905_SPI_MODE_2 2
#define NRF905_SPI_MODE_3 3

#define NRF905_COMMAND_R_REGISTER    0x00
#define NRF905_COMMAND_W_REGISTER    0x20
#define NRF905_COMMAND_R_RX_PAYLOAD  0x61
#define NRF905_COMMAND_W_TX_PAYLOAD  0xA0
#define NRF905_COMMAND_FLUSH_TX      0xE1
#define NRF905_COMMAND_FLUSH_RX      0xE2
#define NRF905_COMMAND_REUSE_TX_PL   0xE3
#define NRF905_COMMAND_R_RX_PL_WID   0x60
#define NRF905_COMMAND_W_ACK_PAYLOAD 0xA8
#define NRF905_COMMAND_W_TX_PAYLOAD_NOACK 0xB0
#define NRF905_COMMAND_NOP           0xFF

#define NRF905_CONFIG_PWR_OFF    0x00
#define NRF905_CONFIG_PWR_ON     0x02
#define NRF905_CONFIG_CRC_8      0x00
#define NRF905_CONFIG_CRC_16     0x04
#define NRF905_CONFIG_CRC_EN     0x08
#define NRF905_CONFIG_CRC_DIS    0x00
#define NRF905_CONFIG_LONG_RANGE 0x00
#define NRF905_CONFIG_SHORT_RANGE 0x40
#define NRF905_CONFIG_MODE_RX    0x00
#define NRF905_CONFIG_MODE_TX    0x20
#define NRF905_CONFIG_HZ_433_92  0x00
#define NRF905_CONFIG_HZ_868_00  0x10
#define NRF905_CONFIG_HZ_915_00  0x20

#define NRF905_STATUS_RX_DR      0x40
#define NRF905_STATUS_TX_DS      0x20
#define NRF905_STATUS_MAX_RT     0x10

static int nrf905_write_register(nrf905_t *dev, uint8_t reg, uint8_t val);
static int nrf905_read_register(nrf905_t *dev, uint8_t reg, uint8_t *val);
static int nrf905_spi_transfer(nrf905_t *dev, uint8_t *tx_buf, uint8_t *rx_buf, uint32_t len);

int nrf905_init(nrf905_t *dev)
{
    int ret = 0;

    ret |= gpio_init(dev->ce_pin, GPIO_MODE_OUTPUT);
    ret |= gpio_init(dev->txen_pin, GPIO_MODE_OUTPUT);
    ret |= gpio_init(dev->pwr_pin, GPIO_MODE_OUTPUT);

    gpio_write(dev->ce_pin, 0);
    gpio_write(dev->txen_pin, 0);
    gpio_write(dev->pwr_pin, 1);

    uint8_t config = NRF905_CONFIG_PWR_ON | NRF905_CONFIG_CRC_16 | NRF905_CONFIG_CRC_EN | NRF905_CONFIG_LONG_RANGE | NRF905_CONFIG_MODE_RX | NRF905_CONFIG_HZ_433_92;
    ret |= nrf905_write_register(dev, NRF905_COMMAND_W_REGISTER | 0x00, config);
    ret |= nrf905_set_channel(dev, dev->channel);

    return ret;
}

int nrf905_set_channel(nrf905_t *dev, uint8_t channel)
{
    if (channel > NRF905_CHANNEL_MAX) {
        return -1;
    }

    dev->channel = channel;
    return nrf905_write_register(dev, NRF905_COMMAND_W_REGISTER | 0x01, channel);
}

int nrf905_set_tx_address(nrf905_t *dev, uint8_t *address)
{
    return nrf905_write_register(dev, NRF905_COMMAND_W_REGISTER | 0x10, address[0]) ||
           nrf905_write_register(dev, NRF905_COMMAND_W_REGISTER | 0x11, address[1]) ||
           nrf905_write_register(dev, NRF905_COMMAND_W_REGISTER | 0x12, address[2]) ||
           nrf905_write_register(dev, NRF905_COMMAND_W_REGISTER | 0x13, address[3]) ||
           nrf905_write_register(dev, NRF905_COMMAND_W_REGISTER | 0x14, address[4]);
}

int nrf905_send(nrf905_t *dev, uint8_t *data, uint32_t len)
{
    gpio_write(dev->ce_pin, 0);
    gpio_write(dev->txen_pin, 1);

    int ret = nrf905_write_register(dev, NRF905_COMMAND_W_TX_PAYLOAD, data[0]);
    for (int i = 1; i < len; i++) {
        ret |= nrf905_write_register(dev, NRF905_COMMAND_W_TX_PAYLOAD_NOACK, data[i]);
    }

    gpio_write(dev->ce_pin, 1);

    uint8_t status;
    int timeout = 100000;
    do {
        nrf905_read_register(dev, NRF905_COMMAND_R_REGISTER | 0x07, &status);
        if (--timeout == 0) {
            ret = -1;
            break;
        }
    } while (!(status & NRF905_STATUS_TX_DS));

    gpio_write(dev->txen_pin, 0);

    nrf905_write_register(dev, NRF905_COMMAND_FLUSH_TX, 0);

    return ret;
}

int nrf905_receive(nrf905_t *dev, uint8_t *data, uint32_t len)
{
    gpio_write(dev->ce_pin, 0);

    int ret = nrf905_write_register(dev, NRF905_COMMAND_FLUSH_RX, 0);

    gpio_write(dev->ce_pin, 1);

    uint8_t status;
    int timeout = 100000;
    do {
        nrf905_read_register(dev, NRF905_COMMAND_R_REGISTER | 0x07, &status);
        if (--timeout == 0) {
            ret = -1;
            break;
        }
    } while (!(status & NRF905_STATUS_RX_DR));

    gpio_write(dev->ce_pin, 0);

    ret |= nrf905_read_register(dev, NRF905_COMMAND_R_RX_PAYLOAD, data);

    return ret;
}

static int nrf905_write_register(nrf905_t *dev, uint8_t reg, uint8_t val)
{
    uint8_t tx_buf[2] = {reg, val};
    uint8_t rx_buf[2];

    return nrf905_spi_transfer(dev, tx_buf, rx_buf, 2);
}

static int nrf905_read_register(nrf905_t *dev, uint8_t reg, uint8_t *val)
{
    uint8_t tx_buf[2] = {reg, 0xFF};
    uint8_t rx_buf[2];

    int ret = nrf905_spi_transfer(dev, tx_buf, rx_buf, 2);

    *val = rx_buf[1];

    return ret;
}

static int nrf905_spi_transfer(nrf905_t *dev, uint8_t *tx_buf, uint8_t *rx_buf, uint32_t len)
{
    spi_init(dev->spi_speed_hz, dev->spi_mode);

    gpio_write(dev->ce_pin, 0);

    int ret = spi_transfer(tx_buf, rx_buf, len);

    gpio_write(dev->ce_pin, 1);

    return ret;
}

注意，以上代码中的gpio_init()和gpio_write()函数是GPIO控制相关的函数，spi_init()和spi_transfer()函数是SPI总线控制相关的函数，这些函数的实现需要根据具体的硬件平台进行编写。