113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/*
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Author: J.F. van der Bent
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W Pielage & E Helmond
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Date: 24-11-2021
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Revision: 5
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keys.c:
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Keyboard-driver for SpARM-board v2
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pin-info:
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PD1 - R2
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PD2 - R3
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PD3 - R4
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PD6 - K1
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PD7 - K2
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PD8 - K3
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PD9 - K4
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PD11 - R1
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Key B1 = 1 ----- key B16 = 16
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To use the keyboard first initialize the ports:
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KEYS_init();
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After that, you can use polling to read a key with:
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KEYS_read();
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*/
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#include "main.h"
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void KEYS_init(void)
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/* Keys initialize
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* In this function the ports are set for the keyboard.
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* The rows are outputs and the columns are input.
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*/
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{
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__HAL_RCC_GPIOD_CLK_ENABLE();
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GPIO_InitTypeDef gpio;
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gpio.Mode = GPIO_MODE_OUTPUT_PP;
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gpio.Pull = GPIO_NOPULL;
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gpio.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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gpio.Pin = KEY_ROW;
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HAL_GPIO_Init(PKEY_ROW, &gpio);
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gpio.Pin = KEY_COL;
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gpio.Mode = GPIO_MODE_INPUT;
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gpio.Pull = GPIO_PULLDOWN;
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HAL_GPIO_Init(PKEY_COL, &gpio);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_ROW, 0);
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}
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void KEYS_initISR(int hilo)
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/* Keys initialize for ISR
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* Set all lines high
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* */
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{
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R1, hilo);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R2, hilo);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R4, hilo);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R3, hilo);
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}
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unsigned int KEYS_read(void)
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/* Keys read
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* This function reads which key is pressed.
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* It does so by making a row high and check if there is a connection with a column.
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* If there is a connection the value is returned.
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*/
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{
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unsigned int key = 0;
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unsigned out = 0;
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R1, 0);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R4, 1);
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key = KEYS_kolom();
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if( key != 0 ) out= 12+key;
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R4, 0);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R3, 1);
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key = KEYS_kolom();
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if( key != 0 ) out = 8+key;
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R3, 0);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R2, 1);
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key = KEYS_kolom();
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if( key != 0 ) out = 4+key;
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R2, 0);
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HAL_GPIO_WritePin(PKEY_ROW, KEY_R1, 1);
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key = KEYS_kolom();
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if( key != 0 ) out = key;
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return out;
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}
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unsigned int KEYS_kolom(void)
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/* Keys Column
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* In this function the columns are checked if there is a connection.
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* If a column has a connection the return value is the column number.
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*/
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{
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unsigned int key = 0;
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if (HAL_GPIO_ReadPin(PKEY_COL, KEY_K1) == 1) key = 1;
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if (HAL_GPIO_ReadPin(PKEY_COL, KEY_K2) == 1) key = 2;
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if (HAL_GPIO_ReadPin(PKEY_COL, KEY_K3) == 1) key = 3;
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if (HAL_GPIO_ReadPin(PKEY_COL, KEY_K4) == 1) key = 4;
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return key;
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}
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