DSP28335LCD1602实时显示代码

以下是基于DSP28335和LCD1602的实时显示代码：

#include "DSP2833x_Device.h"
#include "DSP2833x_Examples.h"
#include "DSP2833x_GlobalPrototypes.h"
#include "LCD1602.h"

void main(void)
{
    InitSysCtrl();
    InitGpio();
    InitXintf();

    Init_LCD1602();      // 初始化LCD1602

    while(1)
    {
        // 在第一行第一列显示“Hello”
        LCD1602_Write_String("Hello", 1, 1);

        // 在第二行第一列显示当前时间
        Uint16 hour = CpuTimer0Regs.TIM.all / 360000000;
        Uint16 minute = (CpuTimer0Regs.TIM.all % 360000000) / 6000000;
        Uint16 second = (CpuTimer0Regs.TIM.all % 6000000) / 100000;
        char time_str[9];
        sprintf(time_str, "%02d:%02d:%02d", hour, minute, second);
        LCD1602_Write_String(time_str, 2, 1);
    }
}

上述代码使用了一个名为LCD1602_Write_String的函数，该函数将字符串写入LCD1602。以下是LCD1602.h头文件和LCD1602.c源代码：

LCD1602.h：

#ifndef __LCD1602_H__
#define __LCD1602_H__

#include "DSP2833x_Device.h"

void Init_LCD1602(void);
void LCD1602_Write_Command(Uint16 command);
void LCD1602_Write_Data(Uint16 data);
void LCD1602_Write_String(char *string, Uint16 line, Uint16 position);

#endif

LCD1602.c：

#include "LCD1602.h"

void Init_LCD1602(void)
{
    // 初始化GPIO为输出
    EALLOW;
    GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1;
    GpioCtrlRegs.GPBMUX1.bit.GPIO35 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO35 = 1;
    GpioCtrlRegs.GPBMUX1.bit.GPIO36 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO36 = 1;
    GpioCtrlRegs.GPBMUX1.bit.GPIO37 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO37 = 1;
    GpioCtrlRegs.GPBMUX1.bit.GPIO38 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO38 = 1;
    GpioCtrlRegs.GPBMUX1.bit.GPIO39 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO39 = 1;
    EDIS;

    // 初始化LCD1602
    DELAY_US(15000);
    LCD1602_Write_Command(0x38);
    DELAY_US(5000);
    LCD1602_Write_Command(0x38);
    DELAY_US(5000);
    LCD1602_Write_Command(0x38);
    DELAY_US(5000);
    LCD1602_Write_Command(0x0C);
    DELAY_US(5000);
    LCD1602_Write_Command(0x01);
    DELAY_US(5000);
    LCD1602_Write_Command(0x06);
    DELAY_US(5000);
}

void LCD1602_Write_Command(Uint16 command)
{
    GpioDataRegs.GPBDAT.bit.GPIO34 = 0;  // RS = 0
    GpioDataRegs.GPBDAT.bit.GPIO35 = 0;  // RW = 0
    GpioDataRegs.GPBDAT.bit.GPIO36 = (command >> 4) & 0x1;  // D4
    GpioDataRegs.GPBDAT.bit.GPIO37 = (command >> 5) & 0x1;  // D5
    GpioDataRegs.GPBDAT.bit.GPIO38 = (command >> 6) & 0x1;  // D6
    GpioDataRegs.GPBDAT.bit.GPIO39 = (command >> 7) & 0x1;  // D7
    GpioDataRegs.GPBDAT.bit.GPIO34 = 1;  // E = 1
    DELAY_US(1);
    GpioDataRegs.GPBDAT.bit.GPIO34 = 0;  // E = 0
    GpioDataRegs.GPBDAT.bit.GPIO36 = command & 0x1;  // D4
    GpioDataRegs.GPBDAT.bit.GPIO37 = (command >> 1) & 0x1;  // D5
    GpioDataRegs.GPBDAT.bit.GPIO38 = (command >> 2) & 0x1;  // D6
    GpioDataRegs.GPBDAT.bit.GPIO39 = (command >> 3) & 0x1;  // D7
    GpioDataRegs.GPBDAT.bit.GPIO34 = 1;  // E = 1
    DELAY_US(1);
    GpioDataRegs.GPBDAT.bit.GPIO34 = 0;  // E = 0
}

void LCD1602_Write_Data(Uint16 data)
{
    GpioDataRegs.GPBDAT.bit.GPIO34 = 1;  // RS = 1
    GpioDataRegs.GPBDAT.bit.GPIO35 = 0;  // RW = 0
    GpioDataRegs.GPBDAT.bit.GPIO36 = (data >> 4) & 0x1;  // D4
    GpioDataRegs.GPBDAT.bit.GPIO37 = (data >> 5) & 0x1;  // D5
    GpioDataRegs.GPBDAT.bit.GPIO38 = (data >> 6) & 0x1;  // D6
    GpioDataRegs.GPBDAT.bit.GPIO39 = (data >> 7) & 0x1;  // D7
    GpioDataRegs.GPBDAT.bit.GPIO34 = 1;  // E = 1
    DELAY_US(1);
    GpioDataRegs.GPBDAT.bit.GPIO34 = 0;  // E = 0
    GpioDataRegs.GPBDAT.bit.GPIO36 = data & 0x1;  // D4
    GpioDataRegs.GPBDAT.bit.GPIO37 = (data >> 1) & 0x1;  // D5
    GpioDataRegs.GPBDAT.bit.GPIO38 = (data >> 2) & 0x1;  // D6
    GpioDataRegs.GPBDAT.bit.GPIO39 = (data >> 3) & 0x1;  // D7
    GpioDataRegs.GPBDAT.bit.GPIO34 = 1;  // E = 1
    DELAY_US(1);
    GpioDataRegs.GPBDAT.bit.GPIO34 = 0;  // E = 0
}

void LCD1602_Write_String(char *string, Uint16 line, Uint16 position)
{
    Uint16 address = (line == 1 ? 0x00 : 0x40) + position - 1;
    LCD1602_Write_Command(0x80 | address);
    while(*string)
    {
        LCD1602_Write_Data(*string++);
    }
}

上述代码中，LCD1602_Write_Command函数和LCD1602_Write_Data函数分别用于向LCD1602写入指令和数据，并通过GPIO控制LCD1602。LCD1602_Write_String函数使用LCD1602_Write_Data函数将字符串写入LCD1602的指定位置。由于LCD1602的显示范围为2行16列，因此第一行的位置为1-16，第二行的位置为17-32。