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labW3barnestr/Inc/keypad.h

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+/*
+ * keypad.h
+ *
+ * Created on: Dec 17, 2021
+ * Author: Trevor Barnes
+ */
+
+#ifndef KEYPAD_H_
+#define KEYPAD_H_
+
+#include <inttypes.h>
+
+
+#define RCC_AHB1ENR (volatile uint32_t*) 0x40023830
+#define GPIOCEN 2
+#define GPIOC_MODER (volatile uint32_t*) 0x40020800
+#define GPIOC_PUPDR (volatile uint32_t*) 0x4002080C
+#define GPIOC_IDR (volatile uint32_t*) 0x40020810
+#define GPIOC_ODR (volatile uint32_t*) 0x40020814
+#define GPIOC_BSRR (volatile uint32_t*) 0x40020818
+
+extern void keypad_init();
+
+//Returns the code for the current key pressed
+//	0 - No key
+//  1  2   3  4
+//
+//  5  6  7  8
+//
+//  9 10  11 12
+//
+//  13 14 15 16
+// 255 - Error
+// This function does not block the flow of the program
+extern uint8_t keypad_getKeyNoBlock();
+
+//Returns the code for the next pressed
+//	0 - No key
+//  1  2   3  4
+//
+//  5  6  7  8
+//
+//  9 10  11 12
+//
+//  13 14 15 16
+// 255 - Error
+// This function will block the flow of the program until a
+//   key is pressed.
+extern uint8_t keypad_getKey();
+
+#endif /* KEYPAD_H_ */