Diff: main.cpp

Revision:

0:f123c8d6edd2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Dec 11 14:11:22 2018 +0000
@@ -0,0 +1,167 @@
+// This file is used to set the current time to the buffer 
+
+#include "mbed.h"
+#include "N5110.h"
+
+BusOut leds(LED1,LED2,LED3,LED4);
+
+//         VCC,SCE,RST,D/C,MOSI,SCLK,LED
+N5110 lcd(p7,p8,p9,p10,p11,p13,p21);  // LPC1768 - pwr from GPIO
+//N5110 lcd(p8,p9,p10,p11,p13,p21);  // LPC1768 - powered from +3V3 - JP1 in 2/3 position
+//N5110 lcd(PTC9,PTC0,PTC7,PTD2,PTD1,PTC11);  // K64F - pwr from 3V3
+
+//------------------------TMP102 START-----------------
+// addresses for ADD0 connected to GND
+#define TMP102_ADD 0x48
+#define TMP102_R_ADD 0x91
+#define TMP102_W_ADD 0x90
+
+// register addresses
+#define TEMP_REG 0x00
+#define CONFIG_REG 0x01
+#define THIGH_REG 0x02
+#define TLOW_REG 0x03
+
+
+I2C tmp102(p28,p27); // SDA, SCL
+
+
+// hang in infinite loop flashing error code
+void error(int code)
+{
+    while(1) {
+        leds = 0;
+        wait(0.25);
+        leds = code;
+        wait(0.25);
+    }
+}
+
+void initTMP102()
+{
+    tmp102.frequency(400000); // set bus speed to 400 kHz
+    int ack; // used to store acknowledgement bit
+    char data[2]; // array for data
+    char reg = CONFIG_REG; // register address
+//////// Read current status of configuration register ///////
+    ack = tmp102.write(TMP102_W_ADD,&reg,1); // send the slave write address and the configuration register address
+    if (ack)
+        error(1); // if we don't receive acknowledgement, flash error message
+    ack = tmp102.read(TMP102_R_ADD,data,2); // read default 2 bytes from configuration register and store in buffer
+    if (ack)
+        error(2); // if we don't receive acknowledgement, flash error message
+///////// Configure the register //////////
+// set conversion rate to 1 Hz
+    data[1] |= (1 << 6); // set bit 6
+    data[1] &= ~(1 << 7); // clear bit 7
+//////// Send the configured register to the slave ////////////
+    char tx_data[3] = {reg,data[0],data[1]}; // create 3-byte packet for writing (p12 datasheet)
+    ack = tmp102.write(TMP102_W_ADD,tx_data,3); // send the slave write address, config reg address and contents
+    if (ack)
+        error(3); // if we don't receive acknowledgement, flash error message
+}
+
+float getTemperature()
+{
+    int ack; // used to store acknowledgement bit
+    char data[2]; // array for data
+    char reg = TEMP_REG; // temperature register address
+    ack = tmp102.write(TMP102_W_ADD,&reg,1); // send temperature register address
+    if (ack)
+        error(5); // if we don't receive acknowledgement, flash error message
+    ack = tmp102.read(TMP102_R_ADD,data,2); // read 2 bytes from temperature register and store in array
+    if (ack)
+        error(6); // if we don't receive acknowledgement, flash error message
+    int temperature = (data[0] << 4) | (data[1] >> 4);
+    return temperature*0.0625;
+}
+
+//--------------------------TMP102 END-----------------------
+
+void setTime();    // function to set the UNIX time
+
+//--------------------------set time-----------------------
+void setTime() {
+    int year=2018;
+    int mon=12;
+    int day=11;
+    int hour=14;
+    int min=0;
+    int sec=0;
+
+struct tm timeinfo;
+    timeinfo.tm_year=year-1900;
+    timeinfo.tm_mon=mon-1;
+    timeinfo.tm_mday=day;
+    timeinfo.tm_hour=hour;
+    timeinfo.tm_min=min;
+    timeinfo.tm_sec=sec;
+
+    // update the time
+    time_t current=mktime(&timeinfo);
+    set_time(current);
+}
+//-------------------------set time end--------------------
+
+int main()
+{
+    
+    initTMP102(); // initial TMP102
+
+    // first need to initialise display
+    lcd.init();
+
+    // change set contrast in range 0.0 to 1.0
+    // 0.5 appears to be a good starting point
+    lcd.setContrast(0.5);
+
+
+    char buffert[30];  // buffer used to store time string
+    char bufferd[30];  // buffer used to store date string
+    
+
+    setTime();  // initialise time to 1st January 1970
+
+
+
+
+    while(1) {
+
+        // these are default settings so not strictly needed
+        lcd.normalMode();      // normal colour mode
+        lcd.setBrightness(0.5); // put LED backlight on 50%
+
+        lcd.clear();
+
+        time_t seconds = time(NULL);  // get current time
+        // format time into a string (time and date)
+        strftime(buffert, 30 , "%X", localtime(&seconds));
+        strftime(bufferd, 30 , "%F", localtime(&seconds));
+        // print over serial
+
+        wait(1.0);  // delay for a second
+
+        // clear buffer at start of every loop
+        // can directly print strings at specified co-ordinates (must be less than 84 pixels to fit on display)
+        lcd.printString("Hello, Xiang!",0,0);
+
+        char buffer[14];  // each character is 6 pixels wide, screen is 84 pixels (84/6 = 14)
+        // so can display a string of a maximum 14 characters in length
+        // or create formatted strings - ensure they aren't more than 14 characters long
+
+        float temperature = getTemperature();  // temperature from TMP102
+        int temp = ceil(temperature);
+        //int temp_test = 27;
+
+        //int length = sprintf(buffer,"T = %d C",temp_test); // print formatted data to buffer
+        int length = sprintf(buffer,"T = %2d C",temp); // print formatted data to buffer
+        // it is important the format specifier ensures the length will fit in the buffer
+        if (length <= 14)  // if string will fit on display (assuming printing at x=0)
+            lcd.printString(buffer,0,1);           // display on screen
+
+        lcd.printString(buffert, 0, 2); 
+        lcd.printString(bufferd, 0, 3); 
+
+        lcd.refresh();
+    }
+}