Revision 0:b6f6b0483eff, committed 2016-01-05

Comitter:

BPPearson

Date:

Tue Jan 05 16:42:18 2016 +0000

Commit message:

Biref interface

Changed in this revision

diff -r 000000000000 -r b6f6b0483eff main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jan 05 16:42:18 2016 +0000
@@ -0,0 +1,243 @@
+#include "mbed.h"
+
+#define COMMAND 0
+#define DATA 1
+
+Serial pc(USBTX, USBRX);
+Serial birefSensor(p9,p10);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+AnalogOut birefOut(p18);
+BusInOut databus(p21, p22, p23, p24, p25, p26, p27, p28);
+DigitalOut registerSelect(p30);
+DigitalOut readWriteClock(p29);
+Ticker updateLCD;
+
+
+char rcvBuff[80];
+int buffIdx = 0;
+float birefVal, birefStdDev;
+
+void writeToLCD(bool rs, char data){
+
+    // set register select pin 
+    registerSelect = rs;
+    
+    // set read/write pin to write
+    //readWrite = 0;
+    
+    // set bus as output
+    databus.output();
+    
+    // put data onto bus
+    databus = data;
+    
+    // pulse read/write clock
+    readWriteClock = 1;
+    
+    wait_us(1);
+    
+    readWriteClock = 0;
+
+    wait_us(1);
+    
+    // clear data bus
+    databus = 0;
+    
+    //pc.printf("%02x\n", data);
+    
+}
+
+
+char readFromLCD(bool rs){
+
+    char data;
+    
+    // set register select pin 
+    registerSelect = rs;
+    
+    // set read/write pin to read
+    //readWrite = 1;
+    
+    // set bus as output
+    databus.input();
+    
+    // put data onto bus
+    data = databus;
+    
+    // pulse read/write clock
+    readWriteClock = 1;
+    
+    wait_us(10);
+    
+    readWriteClock = 0;
+    
+    return data;
+}
+
+
+void resetLCD(){
+}
+
+
+void initLCD(){
+    
+    // wait 15 ms to allow LCD to initialise
+    wait_ms(15);
+    
+    // set interface for 8 bit mode
+    writeToLCD(COMMAND, 0x30);
+
+    // give it time    
+    wait_ms(5);
+
+    // set interface for 8 bit mode again
+    writeToLCD(COMMAND, 0x30);
+
+    // give it time    
+    wait_us(100);
+
+    // set interface for 8 bit mode again, last one before we can configure the display
+    writeToLCD(COMMAND, 0x30);
+
+    // give it time    
+    wait_us(500);
+    
+    // set interface for 8 bit mode, 2 display lines and 5 x 8 character font
+    writeToLCD(COMMAND, 0x38);
+
+    // give it time    
+    wait_us(100);
+    
+    // display off
+    writeToLCD(COMMAND, 0x08);
+
+    // give it time    
+    wait_us(100);
+    
+    // clear the screen
+    writeToLCD(COMMAND, 0x01);
+
+    // give it time to finish    
+    wait_ms(2);
+
+    // set entry mode to increment cursor position cursor on write
+    writeToLCD(COMMAND, 0x03);
+    
+    // give it time to finish    
+    wait_us(100);
+
+    // position cursor at home
+    writeToLCD(COMMAND, 0x02);
+    
+    // give it time to finish    
+    wait_ms(2);
+
+    // display on
+    writeToLCD(COMMAND, 0x0C);
+}
+
+
+
+
+void positionCursor(uint8_t x, uint8_t y){
+
+    if (x > 7) x = 0;
+    
+    if (y == 1)
+        writeToLCD(COMMAND, 0x80 + 0x40 + x);
+    else
+        writeToLCD(COMMAND, 0x80 + 0x00 + x);
+        
+    wait_us(50);
+}
+
+
+void displayString(int x, int y, char *str){
+    
+    // position cursor
+    positionCursor(x, y);    
+    
+    // write string to screen
+    for (int i=0; i<strlen(str); i++){
+        writeToLCD(DATA, str[i]);
+        
+        wait_us(50);
+    }
+}
+
+
+ 
+ void updateDisplay(){
+    char str[20];
+    
+    sprintf( str, "b %5.3f", birefVal);
+
+    displayString(0, 0, str);
+
+    if (birefStdDev <= 0.0)
+        birefStdDev = 0.0001;
+        
+    sprintf( str, "s %5.3f", birefStdDev);
+
+    displayString(0, 1, str);
+}
+ 
+ 
+void rcvCharISR()
+{
+    float tempf;
+    char chr = birefSensor.getc();
+
+    //led1 = !led1;
+    
+    //pc.printf("%c (%02x)\n", chr, chr);        
+    
+    rcvBuff[buffIdx++] = chr;
+    
+    if (buffIdx >= 80)
+    {
+        buffIdx = 0;
+    }
+    
+    if (chr == '\n')
+    {
+        rcvBuff[buffIdx] = '\0';
+        
+        switch (rcvBuff[0]){
+            case 'm':
+                sscanf(rcvBuff, "m%f %f\n", &birefVal, &birefStdDev);
+                birefOut = birefVal;
+                break;
+            case 'd':
+                sscanf(rcvBuff, "d%f %f %f %f %f %f \n", &tempf, &tempf, &tempf, &tempf, &birefVal, &birefStdDev);
+                birefOut = birefVal;
+                break;
+            default: ;
+        }
+        buffIdx = 0;
+    }
+}
+
+
+ 
+int main() {
+    
+    initLCD();
+    
+    birefSensor.baud(115200);
+    
+    pc.printf("Hello\n");
+    
+    updateLCD.attach(&updateDisplay, 0.5);
+
+    birefSensor.attach(&rcvCharISR);
+    
+    while(1) {
+
+        wait(0.02);
+        //wait(1.0);
+    }
+}

diff -r 000000000000 -r b6f6b0483eff mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Jan 05 16:42:18 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/9ad691361fac
\ No newline at end of file