Wireless transmission module implemented by MSP430 microcontroller

fish001

Wireless transmission module implemented by MSP430 microcontroller [Copy link]

#include "Msp430X14X.h"

#define CE          BIT0
#define CS          BIT1
#define PWR_UP      BIT3
#define ADDR_INDEX  8
#define ADDR_COUNT  4
void CE_HI(void);
void CE_LO(void);
void CS_HI(void);
void CS_LO(void);
void PWR_UP_HI(void);
void PWR_UP_LO(void);
void Init_CLK(void);
void Port_Init(void);
void Init_SPI (void);
void Delay_us(unsigned long nValue);
void Delay_ms(unsigned long nValue);
void Init_RF2401(void);
char ReceivePacket(void);
void TransmitPacket(unsigned char nVal);

//定义串口操作变量
unsigned char UART0_TX_BUF[25];     // 串口 0 的发送缓冲区
int nTX0_Len;
char nTX0_Flag;
int nSend_TX0;
int nDR;


unsigned char rxConfig[15] = {
    0x08, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x87, 0x65, 0x43, 0x21, 0x83, 0x6c, 0x05
};
unsigned char txConfig[15] = {
    0x08, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x87, 0x65, 0x43, 0x21, 0x83, 0x6c, 0x04
};
void main(void)
{
char n;
    WDTCTL = WDTPW + WDTHOLD;   // 关闭看门狗


    _DINT();            // 关闭中断

    Init_CLK();
    Port_Init();
    Init_SPI();

    _EINT();            // 打开中断

    Init_RF2401();
    while(1)
    {
        TransmitPacket(3);
        Delay_ms(3);
        n = ReceivePacket();
    }
}
void Port_Init(void)
{
    P1DIR = 0;
    //设置CE为输出管脚
    P1DIR |= BIT0;   
    //设置CS为输出管脚
    P1DIR |= BIT1;
    //设置PWR_UP为输出管脚
    P1DIR |= BIT3;
    //将中断寄存器清零
    P1IE = 0;
    P1IES = 0;
    P1IFG = 0;
    //管脚 P1.2 使能中断
    P1IE |= BIT2;
    //对应的管脚由低到高电平跳变使相应的标志置位
    P1IES &= ~(BIT2);

    //将P3口所有的管脚设置为一般I/O口
    P3SEL = 0;
    //P3.1 P3.2 P3.3被分配为SPI口
    P3SEL = BIT3 + BIT2 + BIT1;
    //P3.3作为输出管脚
    P3DIR |= BIT3;
    //P3.1作为输出管脚
    P3DIR |= BIT1;
    return;
}

void Init_SPI (void)
{
    //SPI0模块允许     
    ME1 |= USPIE0;
    //将寄存器的内容清零
    U0CTL = 0X00;   
    //数据为8比特，选择SPI模式，单片机为主机模式
    U0CTL |= CHAR + SYNC + MM;

    //将寄存器的内容清零
    U0TCTL = 0X00;  
    // 时钟源为SMCLK，选择3线模式
    U0TCTL = CKPH + SSEL1 + SSEL0 + STC;

    //传输时钟为SMCLK / 800
    UBR0_0 = 0X20;  
    UBR1_0 = 0X03;
    //调整寄存器,没有调整
    UMCTL_0 = 0X00;     //The modulation control register is not used for SPI mode and should be set to 000h.//Transmit interrupt enable IE1 |= UTXIE0; } void CE_HI(void) //CE high level { P1OUT |= BIT0; return; } void CE_LO(void) //ce low { P1OUT &= ~(BIT0); return; } void CS_HI(void) { P1OUT |= BIT1; return; } void CS_LO(void) { P1OUT &= ~(BIT1); return; } void PWR_UP_HI(void) { P1OUT |= BIT3; return; } void PWR_UP_LO(void) { P1OUT &= ~(BIT3); return; } void Init_CLK(void) { unsigned int i; BCSCTL1 = 0X00; //Clear the contents of the Basic Clock System Control Register 1 register //XT2 oscillator is turned on //LFTX1 works in low frequency mode //ACLK's division factor is 1 do { IFG1 &= ~OFIFG; // Clear OSCFault flag for (i = 0x20; i > 0; i--); } while ((IFG1 & OFIFG) == OFIFG); // If OSCFault = 1 BCSCTL2 = 0X00; // Clear the contents of the register BCSCTL2 += SELM1; // The clock source of MCLK is TX2CLK, and the division factor is 1 BCSCTL2 += SELS; // The clock source of SMCLK is TX2CLK, and the division factor is 1 } interrupt [UART0TX_VECTOR] void UART0_TX_ISR(void) { if(nTX0_Len != 0) { // Indicates that the data in the buffer has not been sent out nTX0_Flag = 0; TXBUF0 = UART0_TX_BUF[nSend_TX0]; nSend_TX0 += 1; if(nSend_TX0 >= nTX0_Len) { nSend_TX0 = 0; nTX0_Len = 0; nTX0_Flag = 1; } } } interrupt [PORT1_VECTOR] void DR_ISR(void) { if(P1IFG & BIT2) { nDR = 1; // Clear interrupt flag P1IFG &= ~(BIT2); } } void Delay_ms(unsigned long nValue)//Milliseconds as the unit, 8MHz as the main clock { unsigned long nCount; int i; unsigned long j; nCount = 2667; for(i = nValue;i > 0;i--) { for(j = nCount;j > 0;j--); } return; } void Delay_us(unsigned long nValue)//microseconds, 8MHz as the main clock{ int nCount; int i; int j; nCount = 3; for(i = nValue;i > 0;i--) { for(j = nCount;j > 0;j--); } return; } void Init_RF2401(void) { int i; nDR = 0; //Activate nRF2401 PWR_UP_HI(); //Delay Delay_ms(4); CS_HI(); Delay_us(100); CE_LO(); Delay_us(100); //Enter configuration mode//Send configuration informationfor(i = 0;i < 15;i++) { UART0_TX_BUF[i] = rxConfig[i]; } nTX0_Len = 15; // Set the interrupt flag and enter the transmit interrupt routine IFG1 |= UTXIFG0; } void TransmitPacket(unsigned char nVal) { unsigned char i; CS_HI(); Delay_us(10); TXBUF0 = 0x05; CS_LO(); Delay_us(300); CE_HI(); Delay_us(10); for(i = 0;i < ADDR_COUNT;i++) { UART0_TX_BUF[i] = rxConfig[ADDR_INDEX + i]; } UART0_TX_BUF[i] = nVal; nTX0_Len = ADDR_COUNT + 1; // Set the interrupt flag and enter the transmit interrupt routine IFG1 |= UTXIFG0; CE_LO(); // Delay Delay_us(300); } char ReceivePacket(void) { char nVal; CS_HI(); Delay_us(10); TXBUF0 = 0x04; CS_LO(); Delay_us(300); CE_HI(); while(1) { if(nDR == 1) { break; } } TXBUF0 = 0x0; while ((IFG1 & UTXIFG0) == 0) ; nVal = RXBUF0; CE_LO(); //Delay Delay_us(300); return nVal; }