add projects

2022-01-21 14:53:11 -06:00
parent 39ab045662
commit ca7c76e436
111 changed files with 37834 additions and 0 deletions
--- a/labW3barnestr/Src/keypad.c
+++ b/labW3barnestr/Src/keypad.c
@@ -0,0 +1,99 @@
+/*
+ * keypad.c
+ *
+ */
+
+#include "keypad.h"
+#include "delay.h"
+
+
+void keypad_init(){
+	//Enables the port
+	*RCC_AHB1ENR |= (1<<GPIOCEN);
+
+	//Sets KEY0 - KEY7 as Pull-Ups
+	*GPIOC_PUPDR &= ~(0xFFFF);
+	*GPIOC_PUPDR |= 0x5555;
+}
+
+uint8_t keypad_getKeyNoBlock(){
+
+	uint8_t value = 0;
+	uint8_t keycode = 0;
+
+	//COLS to Inputs and ROWS to Outputs
+	*GPIOC_MODER &= ~(0xFFFF);
+	*GPIOC_MODER |= 0x5500;
+
+	//Clears Rows in ODR
+	*GPIOC_ODR &= ~0xFF;
+	//Reads COLS in IDR
+	value = (*GPIOC_IDR & 0xF);
+
+	//if a button is pressed decode the key
+	if (value != 0xF){
+		//Copy COLS pattern from IDR to ODR
+		*GPIOC_ODR &= ~0xFF;
+		*GPIOC_ODR |= (*GPIOC_IDR & 0xF);
+
+		//COLS to Output and ROWS to Inputs
+		*GPIOC_MODER &= ~(0xFFFF);
+		*GPIOC_MODER |= 0x0055;
+
+		//Small delay (ensure you have this function)
+		delay_us(5);
+
+		//Read ROWS from IDR
+		value |= *GPIOC_IDR & 0xF0;
+
+		//Decode Key
+		switch (value){
+		case 0b11101110 : keycode = 1; break;
+		case 0b11101101 : keycode = 2; break;
+		case 0b11101011 : keycode = 3; break;
+		case 0b11100111 : keycode = 4; break;
+
+		case 0b11011110 : keycode = 5; break;
+		case 0b11011101 : keycode = 6; break;
+		case 0b11011011 : keycode = 7; break;
+		case 0b11010111 : keycode = 8; break;
+
+		case 0b10111110 : keycode = 9; break;
+		case 0b10111101 : keycode = 10; break;
+		case 0b10111011 : keycode = 11; break;
+		case 0b10110111 : keycode = 12; break;
+
+		case 0b01111110 : keycode = 13; break;
+		case 0b01111101 : keycode = 14; break;
+		case 0b01111011 : keycode = 15; break;
+		case 0b01110111 : keycode = 16; break;
+
+		default: keycode = 255;
+		}
+	}
+
+	return keycode;
+}
+
+
+uint8_t keypad_getKey(){
+
+	uint8_t key, keycode;
+
+	keycode = 0;
+
+	while (keycode ==  0){
+		//Check status of keypad
+		key = keypad_getKeyNoBlock();
+		if (key != 0) {
+			//if key is pressed save which key
+			keycode = key;
+			//wait for the release of the key
+			while (key != 0){
+				key = keypad_getKeyNoBlock();
+			}
+		}
+	}
+	return keycode;
+}
+