stm32_ps2 keyboard display test program-EEWORLD

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//PS2 keyboard test program, you can wrap lines, press and hold shift and then enter
//Can output uppercase, press CAPS to output uppercase, press again to output lowercase
//This program is only used for testing, the code is redundant and is for reference only. You can delete it as needed.
//PA13->PS2.CLK PA15->PS2.DATA
#include
#include "sys.h"
#include "usart.h"
#include "delay.h"
#include "led.h"
#include "key.h"
#include "exti.h"
#include "wdg.h"
#include "timer.h"
#include "lcd.h"
const u8 unshifted[][2]= //decoding table of shift key not pressed
{
0x0e,'`',
0x15,'q',
0x16,'1',
0x1a,'z',
0x1b,'s',
0x1c,'a',
0x1d,'w',
0x1e,'2',
0x21,'c',
0x22,'x',
0x23,'d',
0x24,'e',
0x25,'4',
0x26,'3',
0x29,' ',
0x2a,'v',
0x2b,'f',
0x2c,'t',
0x2d,'r',
0x2e,'5',
0x31,'n',
0x32,'b',
0x33,'h',
0x34,'g',
0x35,'y',
0x36,'6',
0x39,',',
0x3a,'m',
0x3b,'j',
0x3c,'u',
0x3d,'7',
0x3e,'8',
0x41,',',
0x42,'k',
0x43,'i',
0x44,'o',
0x45,'0',
0x46,'9',
0x49,'.',
0x4a,'/',
0x4b,'l',
0x4c,';',
0x4d,'p',
0x4e,'-',
0x52,''',
0x54,'[',
0x55,'=',
0x5b,']',
0x5d,'\',
0x61,'<',
0x69,'1',
0x6b,'4',
0x6c,'7',
0x70,'0',
0x71,'.',
0x72,'2',
0x73,'5',
0x74,'6',
0x75,'8',
0x79,'+',
0x7a,'3',
0x7b,'-',
0x7c,'*',
0x7d,'9',
0,0
};
const u8 shifted[][2]= //shift key pressed decoding table
{
0x0e,'~',
0x15,'Q',
0x16,'!',
0x1a,'Z',
0x1b,'S',
0x1c,'A',
0x1d,'W',
0x1e,'@',
0x21,'C',
0x22,'X',
0x23,'D',
0x24,'E',
0x25,'$',
0x26,'#',
0x29,' ',
0x2a,'V',
0x2b,'F',
0x2c,'T',
0x2d,'R',
0x2e,'%',
0x31,'N',
0x32,'B',
0x33,'H',
0x34,'G',
0x35,'Y',
0x36,'^',
0x39,'L',
0x3a,'M',
0x3b,'J',
0x3c,'U',
0x3d,'&',
0x3e,'*',
0x41,'<',
0x42,'K',
0x43,'I',
0x44,'O',
0x45,')',
0x46,'(',
0x49,'>',
0x4a,'?',
0x4b,'L',
0x4c,':',
0x4d,'P',
0x4e,'_',
0x52,'"',
0x54,'{',
0x55,'+',
0x5b,'}',
0x5d,'|',
0x61,'>',
0x69,'1',
0x6b,'4',
0x6c,'7',
0x70,'0',
0x71,'.',
0x72,'2',
0x73,'5',
0x74,'6',
0x75,'8',
0x79,'+',
0x7a,'3',
0x7b,'-',
0x7c,'*',
0x7d,'9',
0,0
};
void Decode(u8 scancode); // declare function prototype
u8 bitcount=11,ascii=' '; // bitcount is the bit count value; ascii is the translated ASCII code, the initial value is space
u8 hang=0,lie=0; //Color screen display position
int main(void)
{
Stm32_Clock_Init(9); //System clock settings
delay_init(72); //delay initialization
uart_init(72,9600); //Serial port 1 initialization
EXTIX_Init();
LED_Init();
LCD_Init();
LCD_Clear(YELLOW);
POINT_COLOR=RED;
BACK_COLOR=YELLOW;
while(1)
{
if(hang>=240) //line break
{hang=0;lie+=16;if(lie>=320)lie=0;}
LCD_ShowChar(hang,lie,ascii,16,0); // Display keyboard characters
}
}
void Decode(u8 scancode)
{
static u8 up=0,shift=0; //up is the on/off code mark, shift is the shift key pressed mark
u8 i;
if (!up) //The received 11-bit data is a pass code (up is 0)
{
switch (scancode) //Start translating scan code
{
case 0xF0: //Keyboard release flag (the following byte is a break code)
up=1; //Set up as the code break flag
break;
case 0x12: //Left shift key pressed
shift=1; //Set shift to pressed sign
break;
case 0x59: //right shift key pressed
shift=1; //Set shift to pressed sign
break;
case 0x58: //CAPS key pressed
shift=(shift==0)?1:0;//Invert shift
break;
case 0x66: // Processing when the backspace key is pressed
//Processing when the backspace key is pressed
break;
case 0x5a:// Processing when the Enter key is pressed: line break
ascii=' ';
hang=0;
lie=lie+16;
break;
default:
if(!shift) //If the shift key is not pressed
{ //Find the unshifted table, the left column in the table is the scan code, the right column is the corresponding ASCII code
for(i=0;unshifted[i][0]!=scancode&&unshifted[i][0];i++);
if (unshifted[i][0] == scancode)
{
ascii=unshifted[i][1];
hang=hang+8;
}
}
else //If the shift key is pressed
{ //Find the shifted table
for(i=0;shifted[i][0]!=scancode&&shifted[i][0];i++);
if(shifted[i][0]==scancode)
{
ascii=shifted[i][1];
hang=hang+8;
}
}
break;
}
}
else //The received 11-bit data is broken (up is 1)
{
up = 0; //Reset the broken code flag
switch (scancode) // detect shift key release
{
case 0x12 : //left shift key
shift = 0;
break;
case 0x59 : //right shift key
shift = 0;
break;
default:
break;
}
}
}

In addition, you need to modify the two functions in the interrupt folder

[cpp] view plain copy

void EXTIX_Init(void)
{
RCC->APB2ENR|=1<<2; //Enable PORTA clock
JTAG_Set(JTAG_SWD_DISABLE); //Disable JTAG and SWD
GPIOA->CRL&=0XFFFFFFF0; //PA0 is set as input
GPIOA->CRL|=0X00000008;
GPIOA->CRH&=0X0F0FFFFF; //PA13,15 are set as input
GPIOA->CRH|=0X80800000;
GPIOA->ODR|=1<<13; //PA13 is pulled up, PA0 is pulled down by default
GPIOA->ODR|=1<<15; //PA15 pull-up
Ex_NVIC_Config(GPIO_A,0,RTIR); //Rising edge trigger
//Ex_NVIC_Config(GPIO_A,13,FTIR);//Falling edge trigger
Ex_NVIC_Config(GPIO_A,15,FTIR|RTIR); //Falling and rising edge trigger
MY_NVIC_Init(2,2,EXTI0_IRQChannel,2); //Preempt 2, subpriority 2, group 2
MY_NVIC_Init(2,1,EXTI15_10_IRQChannel,2); //Preempt 2, subpriority 1, group 2
}
//External interrupt 15~10 service program
void EXTI15_10_IRQHandler(void)
{
static u8 data; // Declare local static variables to save scan codes
if (!PAin(15)) // If the falling edge triggers the interrupt
{
if(bitcount < 11 && bitcount > 2) // bits 3 to 10 are data, start bit, check bit and stop bit are ignored
{
data = (data >> 1); // right shift to save data
if(PAin(13)&0x01)
{
data|=0x80; //store a '1'
}
}
}
else //If the rising edge triggers the interrupt
{
if(--bitcount==0) //If all 11 bits are received
{
Decode(data); //Translate the scan code into ASCII code
bitcount = 11; // reset to 11 bits
}
}
// delay_ms(10); //debounce
// if(KEY0==0) //Key 0
// {
// LED0=!LED0;
// }else if(KEY1==0)//Key 1
// {
// LED1=!LED1;
// }
// EXTI->PR=1<<13; // Clear the interrupt flag on LINE13
EXTI->PR=1<<15; //Clear the interrupt flag on LINE15
}

Keywords：stm32 Reference address：stm32_ps2 keyboard display test program

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