initial commit

lib/peripheral/temp.c

@@ -0,0 +1,78 @@
+#include "temp.h"
+
+void Delay1ms(uint y) {
+	uint x;
+	for(; y > 0; y--) {
+		for(x = 110; x > 0; x--);
+	}
+}
+
+uchar Ds18b20Init(void) {
+	uchar i;
+	DSPORT = 0;		// Pull down bus
+	i = 70;
+	while(i--);
+	DSPORT = 1;		// Pull up bus
+	i = 0;
+	while(DSPORT) {
+		Delay1ms(1);
+		i++;
+		if(i > 5) return 0;
+	}
+	return 1;
+}
+
+void Ds18b20WriteByte(uchar payload) {
+	uint i, j;
+	for(j = 0; j < 8; j++) {
+		DSPORT = 0;
+		i++;
+		DSPORT = payload & 0x01;
+		i = 6;
+		while(i--);
+		DSPORT = 1;
+		payload >>= 1;
+	}
+}
+
+uchar Ds18b20ReadByte(void) {
+	uchar byte, bi;
+	uint i, j;
+	for(j = 8; j > 0; j--) {
+		DSPORT = 0;
+		i++;
+		DSPORT = 1;
+		i++;
+		i++;
+		bi = DSPORT;
+		byte = (byte >> 1) | (bi << 7);
+		i = 4;
+		while(i--);
+	}
+	return byte;
+}
+
+void Ds18b20ChangTemp(void) {
+	Ds18b20Init();
+	Delay1ms(1);
+	Ds18b20WriteByte(0xCC);
+	Ds18b20WriteByte(0x44);
+}
+
+void Ds18b20ReadTempCom() {
+	Ds18b20Init();
+	Delay1ms(1);
+	Ds18b20WriteByte(0xCC);
+	Ds18b20WriteByte(0xBE);
+}
+
+int Ds18b20ReadTemp() {
+	int temp = 0;
+	uchar th, tl;
+	Ds18b20ChangTemp();
+	Ds18b20ReadTempCom();
+	temp = th;
+	temp <<= 8;
+	temp |= tl;
+	return temp;
+}

lib/peripheral/temp.h

@@ -0,0 +1,24 @@
+#ifndef __TEMP_H
+#define __TEMP_H
+
+#include <8052.h>
+
+#ifndef uchar
+#define uchar unsigned char
+#endif
+
+#ifndef uint
+#define uint unsigned int
+#endif
+
+#define DSPORT P3_7
+
+void 	Delay1ms(uint y);
+uchar 	Ds18b20Init(void);
+void 	Ds18b20WriteByte(uchar com);
+uchar 	Ds18b20ReadByte(void);
+void 	Ds18b20ChangTemp(void);
+void 	Ds18b20ReadTempCom(void);
+int 	Ds18b20ReadTemp(void);
+
+#endif