Differences

This shows you the differences between two versions of the page.

--- archive:nmk322 [2024/11/04 12:23] – [Library: Timer] azman
+++ archive:nmk322 [2025/10/01 07:31] (current) – [Lecture Slides] azman
@@ Line 9: / Line 9: @@
 [20241017] Updating this for 202425s1 Academic Session.
-===== Lecture Slides =====
-  * Lecture 1 - {{:archive:nmk322:lecture01_overview.pdf|Overview}}
+===== Library Codes =====
-  * Lecture 2 - {{:archive:nmk322:lecture02_arch8051.pdf|Architecture}}
-===== Codes (discussed in class) =====
 Introduction to using 'library' code. Single header include file(s) meant for single source compilation. These are meant to be compiled using Keil 8051 compiler.
+I recommend to use my include file (mcu51.h) rather than the regular (reg51.h) because it would be easier for you to use my example codes and library. I wrote and tested them using my own syntax that can be used on both Keil and SDCC compilers. Simply extract this {{:archive:nmk322:my1code51inc-20241210.zip|zip file}} and setup the include path. Ask me during lab session if you do not know how to do that.
 ==== Library: Serial (UART) ====
@@ Line 234: / Line 233: @@
 #endif /** __MY1UTILS_H__ */
+</file>
+==== Library: Keypad ====
+<file c kpad.h>
+#ifndef __MY1KPAD_H__
+#define __MY1KPAD_H__
+/* 4x4 keypad interface {R0,R1,R2,R3,C0,C1,C2,C3} */
+/* 4x3 keypad interface {C1,R0,C0,R3,C2,R2,R1} */
+/** DefaultPins: C0-C3 => P1.4-P1.7, R0-R3 => P1.0-P1.3 */
+#ifndef KEY_DATA
+#define KEY_DATA P1
+#endif
+#ifndef _ROWS_AT_UPPER_
+#define ROWS_FLAG 0x01
+#define COLS_FLAG 0x10
+#else
+#define ROWS_FLAG 0x10
+#define COLS_FLAG 0x01
+#endif
+/** no-key indicator for keypad */
+#define KEY_NOT_CODE 0x10
+unsigned char key_scan(void) {
+	/** scan for key press */
+	unsigned char irow, icol, mask, test;
+	mask = ROWS_FLAG;
+	for (irow=0;irow<4;irow++) {
+		KEY_DATA = ~mask; test = COLS_FLAG;
+		for (icol=0;icol<4;icol++) {
+			if ((KEY_DATA&test)==0) {
+				while ((KEY_DATA&test)==0);
+				if (icol==3) return irow+0x0A;
+				if (irow==0) return icol+1;
+				if (irow==1) return icol+4;
+				if (irow==2) return icol+7;
+				if (icol==1) return 0;
+				return (icol>>1)+0x0e;
+			}
+			test <<= 1;
+		}
+		mask <<= 1;
+	}
+	return KEY_NOT_CODE;
+}
+unsigned char key_wait(void) {
+	/** wait for key press */
+	unsigned char scan;
+	while ((scan=key_scan())==KEY_NOT_CODE);
+	return scan;
+}
 </file>