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--- archive:nmk322 [2024/11/12 22:48] – [Library: Keypad] azman
+++ archive:nmk322 [2024/12/19 11:56] (current) – [Lecture Slides] azman
@@ Line 15: / Line 15: @@
   * Lecture 3 - {{:archive:nmk322:lecture03_c8051.pdf|C for 8051}}
   * Lecture 4 - {{:archive:nmk322:lecture04_gpio.pdf|8051 I/O}}
+  * Lecture 5 - {{:archive:nmk322:lecture05_timer.pdf|8051 Timer}}
+  * Lecture 6 - {{:archive:nmk322:lecture06_serial.pdf|8051 Serial Interface}}
+  * Lecture 7 - {{:archive:nmk322:lecture07_interrupt.pdf|8051 Interrupt}}
+  * Lecture 8 - {{:archive:nmk322:lecture08_system.pdf|8051 System Management}}
 ===== Library Codes =====
 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 253: / Line 259: @@
 #endif
 #ifndef _ROWS_AT_UPPER_
-#define ROWS_FLAG 0x10
-#define COLS_FLAG 0x01
-#else
 #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>