scan keyboard

Makefile

@@ -1,9 +1,9 @@
 SDCC ?= sdcc
 STCCODESIZE ?= 4089
-SDCCOPTS ?= --code-size $(STCCODESIZE) --xram-size 0 --data-loc 0x30 
+SDCCOPTS ?= --std-c99 --code-size $(STCCODESIZE) --xram-size 0 --data-loc 0x30 
 FLASHFILE ?= main.hex
 
-SRC = src/lcd.c src/utils.c
+SRC = src/lcd.c src/key.c src/utils.c
 
 OBJ=$(patsubst src%.c,build%.rel, $(SRC))
 

src/key.c

@@ -0,0 +1,62 @@
+/*
+ * key.c
+ *
+ *  Created on: Mar 20, 2019
+ */
+
+#include <stdint.h>
+#include "stc15.h"
+
+
+static uint8_t keys[5];
+
+void KeyInit(void){
+	//set column drivers bits 7:4 to quasi-bidirectional w/ pullup M[1:0]=b00
+	//and row inputs bits 3:0 to quasi-bidirectional w/ pullup M[1:0]=b00
+	P1M1 = 0x00;
+	P1M0 = 0x00;
+	//all initially pulled up
+	P1 = 0xff;
+
+	//read top row input buttons using quasi-bidirectional w/ pullup M[1:0]=b00
+	//P3[1:0]
+	P3M1 &= ~(0x3);
+	P3M0 &= ~(0x3);
+	P3 |= 0x3; //pull up
+	//P5[5:4]
+	P5M1 &= ~(0x30);
+	P5M0 &= ~(0x30);
+	P5 |= 0x30; //pull up
+}
+
+
+void KeyScan(void){
+	//top row not part of matrix
+	static const uint8_t M_ROWS = 4;
+	static const uint8_t M_COLS = 4;
+	uint8_t i, j;
+
+	//scan top row
+	keys[0] = 0; //initially
+	keys[0] += (P3_0 ? 0 : (1<<0)); //on
+	keys[0] += (P3_1 ? 0 : (1<<1));
+	keys[0] += (P5_4 ? 0 : (1<<2));
+	keys[0] += (P5_5 ? 0 : (1<<3));
+	//scan matrix
+	for (i = 0; i < M_ROWS; i++){
+		keys[i+1] = 0; //initially
+		for (j = 0; j < M_COLS; j++){
+			uint8_t read;
+			P1 = (~(1 << (j+4))); //pulldown column (all others pull up)
+			read = (P1 & (1<<i)); //read button
+			read = (read == 0 ? 1 : 0); //pressed if grounded by column driver
+			keys[i+1] += (read << j);
+			P1 = 0xff; //reset all as pullups
+		}
+	}
+}
+
+uint8_t* GetKeys(void){
+	return keys;
+}
+

src/key.h

@@ -0,0 +1,15 @@
+/*
+ * key.h
+ *
+ *  Created on: Mar 20, 2019
+ */
+
+#ifndef SRC_KEY_H_
+#define SRC_KEY_H_
+
+void KeyInit(void);
+void KeyScan(void);
+uint8_t* GetKeys(void);
+
+
+#endif /* SRC_KEY_H_ */

src/lcd.c

@@ -150,13 +150,13 @@ static void LCD_OutChar(unsigned char c) {
 void LCD_Open(void) {
 	static int open_error = 0;
 	if (!OpenFlag) {
-		//set ports to output
+		//set ports to push-pull output M[1:0] = b01
-		//P2
+		//P2 entire port
 		P2M1 = 0;
 		P2M0 = 0xff;
-		//P3
+		//P3 pins 7:4
-		P3M1 &= ~(0xfe);
+		P3M1 &= ~(0xf0);
-		P3M0 |= (0xfe);
+		P3M0 |= (0xf0);
 
 		_delay_ms(30); // to allow LCD powerup
 		outCsrBlindNibble(0x03); // (DL=1 8-bit mode)
@@ -251,6 +251,15 @@ short TERMIO_PutChar(unsigned char letter) {
 	return 1;
 }
 
+void LCD_OutNibble(uint8_t x){
+	x &= 0xf; //ensure only bottom nibble
+	if (x <= 9){
+		TERMIO_PutChar(x + '0');
+	} else {
+		TERMIO_PutChar(x - 10 + 'a');
+	}
+}
+
 void LCD_Clear() {
 	if (OpenFlag) {
 		outCsr(0x01);

src/lcd.h

@@ -12,6 +12,7 @@ void LCD_SingleLineGoTo(unsigned int row_to);
 
 void LCD_OutString(const char* string);
 short TERMIO_PutChar(unsigned char letter);
+void LCD_OutNibble(uint8_t x);
 
 unsigned char LCD_Timeout_Error(void);
 

src/main.c

@@ -5,6 +5,7 @@
 #include "stc15.h"
 #include <stdint.h>
 #include "lcd.h"
+#include "key.h"
 #include "utils.h"
 
 #define FOSC 11059200
@@ -13,7 +14,7 @@
 #define WDT_CLEAR() (WDT_CONTR |= 1 << 4)
 void timer0_isr() __interrupt 1 __using 1
 {
-	P3_1 ^= 1;
+//	P3_1 ^= 1;
 }
 
 
@@ -40,8 +41,11 @@ char buf[17];
 int main()
 {
 	uint32_t i;
+	uint8_t* keys;
+	uint8_t key_i;
 	Timer0Init(); // display refresh & switch read
 	LCD_Open();
+	KeyInit();
 	P3_4 = 0; //turn on led backlight
 	LCD_OutString("Hello world !!!!");
 	LCD_GoTo(1,0);
@@ -51,6 +55,15 @@ int main()
 	// LOOP
 	while (1)
 	{
+		LCD_GoTo(0,0);
+		//scan keyboard
+		KeyScan();
+		keys = GetKeys();
+		for (key_i = 0; key_i < 5; key_i++){
+			LCD_OutNibble(keys[key_i]);
+		}
+
+		//counter
 		LCD_GoTo(1,7);
 		LCD_OutString(u32str(i, buf, 10));
 		i++;

src/stc15.h

@@ -18,6 +18,17 @@ __sbit __at (0xC5) P4_5 ;
 __sbit __at (0xC6) P4_6 ;
 __sbit __at (0xC7) P4_7 ;
 
+/*  P5  */
+__sfr __at (0xc8) P5   ;
+__sbit __at (0xc8) P5_0 ;
+__sbit __at (0xc9) P5_1 ;
+__sbit __at (0xca) P5_2 ;
+__sbit __at (0xcb) P5_3 ;
+__sbit __at (0xcc) P5_4 ;
+__sbit __at (0xcd) P5_5 ;
+__sbit __at (0xce) P5_6 ;
+__sbit __at (0xcf) P5_7 ;
+
 __sfr __at 0x94 P0M0;
 __sfr __at 0x93 P0M1;
 __sfr __at 0x92 P1M0;