nRF2401驱动程序（MSP430）（下）

/************************************************************************
** 文件名：nrf2401.c
** 功  能：nRF2401驱动程序c文件
*************************************************************************/
#include "nrf2401.h"
#include <stdio.h>

static void RF_WriteByte(unsigned char data);
static void Delay(unsigned int time);

/*
** 配置数据
*/
static const unsigned char ConfigData[] = {
    (unsigned char)DATA2_W,
    (unsigned char)DATA1_W,
    (unsigned char)ADDR2_4,
    (unsigned char)ADDR2_3,
    (unsigned char)ADDR2_2,
    (unsigned char)ADDR2_1,
    (unsigned char)ADDR2_0,
    (unsigned char)ADDR1_4,
    (unsigned char)ADDR1_3,
    (unsigned char)ADDR1_2,
    (unsigned char)ADDR1_1,
    (unsigned char)ADDR1_0,
    (unsigned char)((ADDR_W << 2) | (CRC_L << 1) | CRC_EN),
    (unsigned char)((RX2_EN << 7) | (CM << 6) | (RFDR_SB << 5) | (XO_F << 2) | RF_PWR),
    (unsigned char)((RF_CH << 1) | RXEN)
};

/*
** 向nrf2401发送一个字节的数据
** data:要发送的数
*/
static void RF_WriteByte(unsigned char data)
{
    unsigned char i;
    for(i = 0x80; i > 0; i /= 2)
    {
        if((data & i) != 0)
            DATA_OUT_H;
        else
            DATA_OUT_L;
        CLK1_H;
        _NOP();
        _NOP();
        CLK1_L;
    }
}

static void Delay(unsigned int time)
{
    while(time--);
}

/*
** Enter Active modes
*/
void RF_Active(void)
{
    PWR_UP_H;
    CE_H;
    CS_L;
}

/*
** Enter Configuration modes
*/
void RF_Config(void)
{
    PWR_UP_H;
    CE_L;
    CS_H;
}

/*
** Enter Stand by modes
*/
void RF_Standby(void)
{
    PWR_UP_H;
    CE_L;
    CS_L;
}

/*
** Power down modes
** Note:When the nRF2401A is in power down it must always settle
** in stand by mode for 3ms before it can enter configuration or one
** of the active modes.
*/
void RF_PowerDown(void)
{
    PWR_UP_L;
}

/*
** nRF2401初始化
*/
void RF_Init(void)
{
    unsigned int i;
    IO_INIT();
    RF_Standby();;
    Delay(30000);
    RF_Config();
    for(i = 0; i < 15; i++)
        RF_WriteByte(ConfigData[i]);
    Delay(2000);
    CS_L;
    DATA_OUT_L;
}

/*
** 向指定channel指定地址发送指定数据
** channel:接收端的频道（0 - 127）
** addr: 接收端的地址的指针
** alength:地址长度（byte)
** sendbuffer：要发送数据的首指针
** dlength:数据长度

** 注意：接收端地址数组的第一个元素为地址高字节，如接收端地址ADDR1_4 ...ADDR1_0为

** 0x11,0x22,0x33,0x44,0x55,那么接收端地址数组addr[]={0x11,0x22,0x33,0x44,0x55}
*/
void RF_SendData(unsigned char channel,     \
                 unsigned char *addr,       \
                 unsigned char alength,     \
                 unsigned char *sendbuffer,\
                 unsigned char dlength)
{
    unsigned int i;
    if(channel > 127)
        return;
    if(alength > 5)
        return;
    if(dlength > 32)
        return;
    if((addr == NULL) || (sendbuffer == NULL))
        return;
    RF_Config();
    RF_WriteByte((unsigned char)(channel << 1));
    Delay(2000);
    CS_L;
    DATA_OUT_L;
    RF_Active();
    for(i = 0; i < alength; i++)
        RF_WriteByte(*addr++);
    for(i = 0; i < dlength; i++)
        RF_WriteByte(*sendbuffer++);
    Delay(2000);
    CE_L;
    DATA_OUT_L;
}

/*
** 进入接收模式
*/
void RF_RXMode(void)
{
    RF_Config();
    DATA_OUT_H;
    CLK1_H;
    _NOP();
    _NOP();
    CLK1_L;
    Delay(2000);
    CS_L;
    CE_H;
}

/*
** 接收数据
** receivebuffer:接收缓冲区指针
** channel：接收的通道
** 返回接收到得字节数,错误返回-1
*/
int RF_ReceiveData(unsigned char *receivebuffer, unsigned char channel)
{
    unsigned char temp = 0;
    unsigned int i = 0, j = 0;
    if(receivebuffer == NULL)
        return -1;
    if((channel < 1) || (channel > 2))
        return -1;
    switch(channel)
    {
        case 1:
            DATA_IN;
            while(DR1_IN_H)
            {
                CLK1_H;
                if(DATA_IN_H)
                    temp |= 1;
                i++;
                if(i > 7)
                {
                    i = 0;
                    receivebuffer[j] = temp;
                    temp = 0;
                    j++;
                }
                CLK1_L;

                temp = temp << 1;
            }
            DATA_OUT;
            break;
        case 2:
            while(DR2_IN_H)
            {
                CLK2_H;
                if(DOUT2_IN_H)
                    temp |= 1;
                i++;
                if(i > 7)
                {
                    i = 0;
                    receivebuffer[j] = temp;
                    temp = 0;
                    j++;
                }
                CLK2_L;

                temp = temp << 1;
            }
            break;
        default:
            break;
    }
    return (int)j;
}