Differences

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--- en:wb_si702x [2015/01/07 19:35]
john1117
+++ en:wb_si702x [2015/04/27 09:52] (current)
john1117
@@ Line 1: / Line 1: @@
+<file c wb_si702x.c>
+//------------------------------------------------------------------------------
+//
+// si702x of Weather-Board with 16x2 lcd Application.
+//
+// Defined port number is wiringPi port number.
+//
+// Compile : gcc -o <create excute file name> <source file name> -lwiringPi
+//							-lwiringPiDev -lpthread
+// Run : sudo ./<created excute file name>
+//
+//------------------------------------------------------------------------------
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <wiringPi.h>
+#include <lcd.h>
+#define LCD_ROW			2   // 16 Char
+#define LCD_COL			16  // 2 Line
+#define LCD_BUS			4   // Interface 4 Bit mode
+#define LCD_UPDATE_PERIOD	300 // 300ms
+#define PORT_LCD_RS	7   // GPIOY.BIT3(#83)
+#define PORT_LCD_E	0   // GPIOY.BIT8(#88)
+#define PORT_LCD_D4	2   // GPIOX.BIT19(#116)
+#define PORT_LCD_D5	3   // GPIOX.BIT18(#115)
+#define PORT_LCD_D6	1   // GPIOY.BIT7(#87)
+#define PORT_LCD_D7	4   // GPIOX.BIT7(#104)
+static unsigned char lcdFb[LCD_ROW][LCD_COL] = {0, };
+static int lcdHandle = 0;
+static int ledPos = 0;
+unsigned char temperature[10] = {0, };
+unsigned char humidity[10] = {0, };
+static const char *si702x_node[] = {
+	"/sys/bus/i2c/drivers/si702x/1-0040/temperature",
+	"/sys/bus/i2c/drivers/si702x/1-0040/humidity",
+};
+static void getSysInfo(void)
+{
+	int n, tempfd, humifd;
+	tempfd = open(si702x_node[0], O_RDONLY);
+	read(tempfd, temperature, 10);
+	humifd = open(si702x_node[1], O_RDONLY);
+	read(humifd, humidity, 10);
+	close(tempfd);
+	close(humifd);
+}
+static void lcd_update (void)
+{
+	int i, j;
+	memset((void *)&lcdFb, ' ', sizeof(lcdFb));
+	getSysInfo();
+	sprintf(lcdFb[0], "TEMP : %.1f *C", atof(temperature));
+	sprintf(lcdFb[1], "HUMI : %.2f %%", atof(humidity));
+	lcdFb[0][strlen(lcdFb[0])] = ' ';
+	lcdFb[1][strlen(lcdFb[1])] = ' ';
+	for(i = 0; i < LCD_ROW; i++) {
+		lcdPosition (lcdHandle, 0, i);
+		for(j = 0; j < LCD_COL; j++)
+			lcdPutchar(lcdHandle, lcdFb[i][j]);
+	}
+}
+int system_init(void)
+{
+	int i, j;
+	// LCD Init
+	lcdHandle = lcdInit(LCD_ROW, LCD_COL, LCD_BUS,
+				PORT_LCD_RS, PORT_LCD_E,
+				PORT_LCD_D4, PORT_LCD_D5,
+				PORT_LCD_D6, PORT_LCD_D7, 0, 0, 0, 0);
+	if(lcdHandle < 0) {
+		fprintf(stderr, "%s : lcdInit failed!\n", __func__);
+		return -1;
+	}
+	return 0;
+}
+int main (int argc, char *argv[])
+{
+	int timer = 0 ;
+	wiringPiSetup ();
+	if (system_init() < 0) {
+		fprintf (stderr, "%s: System Init failed\n", __func__);
+		return -1;
+	}
+	for(;;) {
+                usleep(100000);
+		if (millis () < timer)
+			continue ;
+		timer = millis () + LCD_UPDATE_PERIOD;
+		// lcd update
+		lcd_update();
+	}
+	return 0 ;
+}
+</file>