/***************************************************
使用GPIO0-GPIO11,液晶与其对应的引脚如下所示:
//
// RS--GPIO0引脚,
R/W--GND,
EN--GPIO1引脚,
D0--GPIO2引脚
// D1--GPIO3引脚,
* D2--GPIO4引脚,
* D3--GPIO5引脚,
* D4--GPIO6引脚
// D5--GPIO7引脚,
* D6--GPIO8引脚,
* D7--GPIO9引脚;
*
*按键扫描,,三行接的是GPIO12 13 14
三列接的是GPIO48 49 50
按键扫描原理: 1、3列对应的IO设置为输出,3行对应的IO设置为输入。其实
2、若无按键按下,3行输入IO,均为高电平(因为有外部上拉电阻)
3、若按键按下,对应行IO被拉低(假设为第X行),检测为低电平。按键所在行(X行),被鉴别出来。
4、此时,依次改变3列的输出为高,当遇到按键所在列时,第X行电平重新变为高。按键所在列。被鉴别出来。
观测变量Key的值来判断哪个按键按下了;
程序中设定定时器0的定时周期是100ms,,KX_Tim的值为2时才进行按键值的计算,,也就是相当于每200ms扫描一次按键,,然后用1602显示
* ****************************************************/
#include "DSP2833x_Device.h"
#include "DSP2833x_Examples.h"
/*******************************
//宏定义
******************************/
#define SET_KY1 GpioDataRegs.GPBSET.bit.GPIO48 = 1
#define SET_KY2 GpioDataRegs.GPBSET.bit.GPIO49 = 1
#define SET_KY3 GpioDataRegs.GPBSET.bit.GPIO50 = 1
#define RST_KY1 GpioDataRegs.GPBCLEAR.bit.GPIO48 = 1
#define RST_KY2 GpioDataRegs.GPBCLEAR.bit.GPIO49 = 1
#define RST_KY3 GpioDataRegs.GPBCLEAR.bit.GPIO50 = 1
#define KX1_STATUS GpioDataRegs.GPADAT.bit.GPIO12
#define KX2_STATUS GpioDataRegs.GPADAT.bit.GPIO13
#define KX3_STATUS GpioDataRegs.GPADAT.bit.GPIO14
#define uchar unsigned char
#define LCD_RS GpioDataRegs.GPADAT.bit.GPIO0
#define LCD_EN GpioDataRegs.GPADAT.bit.GPIO1
#define LCD_DB GpioDataRegs.GPADAT.all
interrupt void cpu_timer0_isr(void);
void Init_KeyGpio(void);//初始化3X3矩阵键盘对应的GPIO端口
void delay(Uint32 t);//软件延时函数
void ResetAllKY(void);//用于复位所有列端口的函数
void KX_AllStatus(void);//用于读取所有行端口的电平状态的函数
void Read_KX(Uint16 x);//读取按键行值的函数
void Read_KY(Uint16 x);//读取按键列值的函数
void Set_KY(Uint16 x);//用于将某一列对应端口置高的函数
void Rst_KY(Uint16 x);//用于将某一列对应端口置低的函数
void Init_Port(void);//初始化1602使用的GPIO端口
void LCD_init(void);//初始化Lcd1602
void LCD_write_command(uchar command);//LCDD写命令函数
void LCD_write_data(uchar dat);//LCD写数据函数
void show(char *cont);//LCD显示函数
Uint16 Keys[3][3] = {1,2,3,4,5,6,7,8,9};
Uint16 Key = 0;
Uint16 KX_On = 0;
uchar temp = 0;
Uint16 KX_Tim[5] = {0};
Uint16 KX_Status[5] = {0};
Uint16 KY_On = 0;
void main(void)
{
InitSysCtrl();
Init_KeyGpio();
Init_Port();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
EALLOW;
PieVectTable.TINT0 = &cpu_timer0_isr;
EDIS;
InitCpuTimers();
ConfigCpuTimer(&CpuTimer0,150,100000);//定时器定时100ms
StartCpuTimer0();
EALLOW;
GpioCtrlRegs.GPBMUX2.bit.GPIO60 = 0;
GpioCtrlRegs.GPBDIR.bit.GPIO60 = 1;
GpioDataRegs.GPBSET.bit.GPIO60 = 1;
EDIS;
IER |= M_INT1;
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
EINT;
LCD_init();
LCD_write_command(0x80);
show("Key number: ");
while(1)
{
//显示函数
}
}
interrupt void cpu_timer0_isr(void)
{
Read_KX(1);
Read_KX(2);
Read_KX(3);
Read_KY(1);
Read_KY(2);
Read_KY(3);
//GpioDataRegs.GPBTOGGLE.bit.GPIO60 = 1;
CpuTimer0.InterruptCount++;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
void Init_KeyGpio(void)
{
EALLOW;
//GPIO48 输出,低电平
GpioCtrlRegs.GPBMUX2.bit.GPIO48 = 0;
GpioCtrlRegs.GPBDIR.bit.GPIO48 = 1;
GpioDataRegs.GPBCLEAR.bit.GPIO48 = 1;
GpioCtrlRegs.GPBPUD.bit.GPIO48 = 0;
//GPIO49 输出,低电平
GpioCtrlRegs.GPBMUX2.bit.GPIO49 = 0;
GpioCtrlRegs.GPBDIR.bit.GPIO49 = 1;
GpioDataRegs.GPBCLEAR.bit.GPIO49 = 1;
GpioCtrlRegs.GPBPUD.bit.GPIO49 = 0;
//GPIO50输出,低电平
GpioCtrlRegs.GPBMUX2.bit.GPIO50 = 0;
GpioCtrlRegs.GPBDIR.bit.GPIO50 = 1;
GpioDataRegs.GPBCLEAR.bit.GPIO50 = 1;
GpioCtrlRegs.GPBPUD.bit.GPIO50 = 0;
//GPIO12,输入
GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 0;
GpioCtrlRegs.GPADIR.bit.GPIO12 = 0;
GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;
//GPIO13 z输入
GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 0;
GpioCtrlRegs.GPADIR.bit.GPIO13 = 0;
GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0;
//GPIO14 输入
GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 0;
GpioCtrlRegs.GPADIR.bit.GPIO14 = 0;
GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0;
EDIS;
ResetAllKY();
}
void ResetAllKY(void)
{
RST_KY1;
RST_KY2;
RST_KY3;
}
void Read_KX(Uint16 x)
{
KX_AllStatus();
if(KX_Status[x] == 0)
{
KX_Tim[x]++;
if(KX_Tim[x] >= 2)
{
KX_On = x;
KX_Tim[1] = 0;
KX_Tim[2] = 0;
KX_Tim[3] = 0;
}
}
}
void KX_AllStatus(void)
{
KX_Status[1] = KX1_STATUS;
KX_Status[2] = KX2_STATUS;
KX_Status[3] = KX3_STATUS;
}
void Read_KY(Uint16 x)
{
if((!KX_Status[KX_On]) && (KX_On))
{
Set_KY(x);
DELAY_US(200);
KX_AllStatus();
if(KX_Status[KX_On])
{
KY_On = x;
Key = Keys[KX_On - 1][KY_On - 1];
temp = Key + 0x30;//数字转字符,,因为LCD1602只能显示字符
LCD_write_command(0x8c);
LCD_write_data(temp);
KX_On = 0;
KY_On = 0;
}
Rst_KY(x);
}
}
void Set_KY(Uint16 x)
{
if(x == 1){SET_KY1;}
if(x == 2){SET_KY2;}
if(x == 3){SET_KY3;}
}
void Rst_KY(Uint16 x)
{
if(x == 1){RST_KY1;}
if(x == 2){RST_KY2;}
if(x == 3){RST_KY3;}
}
void Init_Port(void)
{
EALLOW;
GpioCtrlRegs.GPAMUX1.all = 0x00000000;
GpioCtrlRegs.GPADIR.all = 0x00000FFF;
GpioDataRegs.GPADAT.bit.GPIO0 = 0;
GpioDataRegs.GPADAT.bit.GPIO1 = 0;
EDIS;
}
void LCD_init(void)
{
DELAY_US(15000);
LCD_write_command(0x38);
DELAY_US(5000);
LCD_write_command(0x38);
DELAY_US(5000);
LCD_write_command(0x38);
LCD_write_command(0x38);
LCD_write_command(0x08);
LCD_write_command(0x01);
LCD_write_command(0x06);
LCD_write_command(0x0c);
}
void LCD_write_command(uchar command)
{
LCD_EN = 0;
LCD_RS = 0;
LCD_DB = (command << 2) | 0x0000;
DELAY_US(500);
LCD_EN = 1;
DELAY_US(1000);
LCD_EN = 0;
}
void show(char *cont)
{
while(*cont != 0)
{
LCD_write_data(*cont);
DELAY_US(500);
cont++;
}
}
void LCD_write_data(uchar dat)
{
LCD_EN = 0;
LCD_RS = 1;
LCD_DB = (dat << 2) | 0x0001;
DELAY_US(500);
LCD_EN = 1;
DELAY_US(1000);
LCD_EN = 0;
}
DSP28335定时中断方式扫描矩阵键盘,并用LCD1602显示
于 2019-07-19 21:17:36 首次发布