Matrix keyboard problem

chenbingjy

Matrix keyboard problem [Copy link]

I wrote a program for a matrix keyboard, but it doesn't work very well.

Schematic diagram:

Code:

//Initialize PA8 and PD2 as output ports and enable the clocks of these two ports

//LED IO initialization

void KEY_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOE, ENABLE); //Enable PB, PE port clock

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; //Open drain output

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO port speed is 50MHz

GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //Floating input

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO port speed is 50MHz

GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //Floating input

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO port speed is 50MHz

GPIO_Init(GPIOB, &GPIO_InitStructure);

}

unsigned char GetKey(void)

{

unsigned char keyvalue = 0;

uint16_t hangvalue=0;

GPIO_ResetBits(GPIOE,GPIO_Pin_6 | GPIO_Pin_5 | GPIO_Pin_4 | GPIO_Pin_3); //PE.6, 5, 4, 3 output low

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0380)>>4);

if (hangvalue != 0x3f) // If the value is not 0x3f, it means a key is pressed

{

delay_ms(20); //delay to eliminate jitter

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0380)>>4);

if (hangvalue != 0x3f) // If the value is not 0x3f, it means a key is pressed

{

GPIO_ResetBits(GPIOE,GPIO_Pin_6); //PE.6 output low

GPIO_SetBits(GPIOE,GPIO_Pin_5 | GPIO_Pin_4 | GPIO_Pin_3);

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0300)>>5);

//hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0380)>>4);

switch (hangvalue)

{

case 0x0F:

keyvalue=4;

break;

case 0x17:

keyvalue=5;

break;

case 0x1b:

keyvalue=1;

break;

case 0x1d:

keyvalue=2;

break;

case 0x1e:

keyvalue=3;

break;

default: break;

}

if(keyvalue==0)

{

GPIO_ResetBits(GPIOE, GPIO_Pin_5 );

GPIO_SetBits(GPIOE,GPIO_Pin_6 | GPIO_Pin_4 | GPIO_Pin_3);

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0300)>>5);

switch (hangvalue)

{

case 0x0F:

keyvalue=9;

break;

case 0x17:

keyvalue=10;

break;

case 0x1b:

keyvalue=6;

break;

case 0x1d:

keyvalue=7;

break;

case 0x1e:

keyvalue=8;

break;

default: break;

}

}

if(keyvalue==0)

{

GPIO_ResetBits(GPIOE, GPIO_Pin_4 );

GPIO_SetBits(GPIOE,GPIO_Pin_6 | GPIO_Pin_3 | GPIO_Pin_5);

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0380)>>4);

// Calculate the row number in the first round

switch (hangvalue)

{

case 0x1F:

keyvalue=14;

break;

case 0x2F:

keyvalue=15;

break;

case 0x37:

keyvalue=16;

break;

case 0x3B:

keyvalue=11;

break;

case 0x3D:

keyvalue=12;

break;

case 0x3E:

keyvalue=13;

break;

default: break;

}

}

if(keyvalue==0)

{

GPIO_SetBits(GPIOE,GPIO_Pin_6 | GPIO_Pin_4 | GPIO_Pin_5);

GPIO_ResetBits(GPIOE, GPIO_Pin_3 );

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0380)>>4);

switch (hangvalue)

{

case 0x1F:

keyvalue=20;

break;

case 0x2F:

keyvalue=21;

break;

case 0x37:

keyvalue=22;

break;

case 0x3B:

keyvalue=17;

break;

case 0x3D:

keyvalue=18;

break;

case 0x3E:

keyvalue=19;

break;

default: break;

}

}

GPIO_ResetBits(GPIOE,GPIO_Pin_6 | GPIO_Pin_5 | GPIO_Pin_4 | GPIO_Pin_3); //PE.6, 5, 4, 3 output low

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0380)>>4);

while (hangvalue != 0x3f)

{

hangvalue=(GPIO_ReadInputData(GPIOE)&0x07)+((GPIO_ReadInputData(GPIOB)&0x0380)>>4);

}

return keyvalue;

}

return 0;

}

return 0;

}

Some buttons are not detected correctly:

The buttons 1, 2, 3, 4, 5 are 1, 2, 3, 4, 5.

Buttons 6, 7, 8, 9, 10 are 1, 2, 3, 9, 10

Buttons 11, 12, 13, 14, 15 are 1, 2, 3, 14, 15.

Buttons 16, 17, 18, 19, 20 are 16, 1, 2, 3, 20

Could you please tell me where I am wrong? Thanks!

freebsder

Is the number always like this or is it frequent? If it is always like this, it means the calculation is wrong. If it is frequent, it may cause the speaker to vibrate.

宋元浩

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You can refer to this code

chenbingjy

Song Yuanhao posted on 2020-7-9 22:48 https://github.com/nimaltd/KeyPad You can refer to this code

Thanks