Diff: main.cpp

Revision:

10:77fcbad99a31

Parent:

5:63063a9fa51c

Child:

11:b0a6faaa5e9f

--- a/main.cpp	Mon Dec 09 13:10:24 2019 +0000
+++ b/main.cpp	Mon Feb 17 15:15:24 2020 +0000
@@ -9,9 +9,22 @@
 #include "mbed.h"
 #include "bench.h"
 
+ 
 //Example experiment method 
 void runDemoExperiment0(int cycles, float targetkPa);
 
+//Methods for testing DAC chip - leave for now
+void selectDACB();
+void deselectDACB();
+
+void testDAC();
+void testToggleChannel();
+
+DigitalOut myled(LED1);
+DigitalOut CSA(DAC_CSA);
+DigitalOut CSB(DAC_CSB);
+SPI spi(DAC_MOSI,DAC_MISO,DAC_SCLK);
+
 // Create bench object - this is used to control the test rig
 Bench leg;
 
@@ -35,7 +48,8 @@
     
     /* Setup all peripherals on rig, display info about SD card and the 
     user interface menu */ 
-    leg.initialise(); 
+    leg.initialise(); //this gives the 10MHz, normal clock polarity, mode 1 spi we need, pins are same as for encoder
+    
 
       
     /*Run an experiment when the button is pressed to start datalogging and 
@@ -83,7 +97,7 @@
                 
                 if (experimentRunning) {
                     measureP = leg.getPressure0()*100;//Conversion of bar to kPa
-                    wait(0.2);//Wait a bit
+                    wait(0.05);//Wait a bit
                 } else { //Logging stopped
                     leg.stopLogging(); //Stop logging data
                     leg.setValve(false); //Depressurise
@@ -103,7 +117,7 @@
                 
                 if (experimentRunning) {
                     measureP = leg.getPressure0()*100;//Conversion of bar to kpa
-                    wait(0.2);//Wait a bit
+                    wait(0.05);//Wait a bit
                 } else { //Logging stopped
                     leg.stopLogging(); //Stop logging data
                     leg.resumePrint(); //Let the Bench class print
@@ -117,4 +131,176 @@
     }
 }
 
+void testDAC() {
+    //setup SPI to write 8 bit words, mode 1 and turn select lines high
+    spi.format(8,1);
+    spi.frequency(200000);
+    deselectDACB();
+    wait_ms(20);
+    
+    //Power up DAC
+    selectDACB();
+    spi.write(0xE0);
+    spi.write(0x00);
+    deselectDACB();
+    
+    //Write a value to a channel
+    selectDACB();
+    spi.write(0x47);
+    spi.write(0xFF);
+    deselectDACB();
+    
 
+    
+    
+  /*  selectDACB();
+    spi.write(0x2F);
+    spi.write(0xFF);
+    deselectDACB();
+    
+    selectDACB();
+    spi.write(0x60);
+    spi.write(0x00);
+    deselectDACB();*/
+    
+    //wait(3);
+    
+    //Write a value to a channel
+  /*  selectDACB();
+    spi.write(0x40);
+    spi.write(0x00);
+    deselectDACB();*/
+    
+    while (true) {
+        myled = !myled;
+
+
+        wait_ms(500);
+    }
+}    
+
+/** Selects DAC B (enable line goes low)
+ */
+void selectDACB()
+{
+    CSB.write(0);
+    wait_us(1);
+}
+
+/** Deselects DAC B (enable line goes high)
+ */
+void deselectDACB()
+{
+    CSB.write(1);
+    wait_us(1);
+}
+    
+void testToggleChannel()
+{
+        // POWER up dac
+    //select chip
+    CSB.write(0);
+    wait_us(1);
+
+    spi.write(0b11100000);
+    spi.write(0b00000000);
+
+    //deselect chip
+    CSB.write(1);
+    wait_us(1);
+
+
+    //write output on a
+    //select chip
+    CSB.write(0);
+    wait_us(1);
+
+    spi.write(0b01000011);
+    spi.write(0b11111111);
+
+    //deselect chip
+    CSB.write(1);
+    wait_us(1);
+    
+   
+    //write output on b
+    //select chip
+    CSB.write(0);
+    wait_us(1);
+
+    spi.write(0b01011011);
+    spi.write(0b11111111);
+
+    //deselect chip
+    CSB.write(1);
+    wait_us(1);
+    
+    while (true) {
+        //leg.pc.printf("Hi");
+        // POWER up dac
+        //select chip
+        CSB.write(0);
+        wait_us(1);
+
+        spi.write(0b11100000);
+        spi.write(0b00000000);
+
+        //deselect chip
+        CSB.write(1);
+        wait_us(1);
+        //write output on a
+        //select chip
+        CSB.write(0);
+        wait_us(1);
+
+        spi.write(0b01010011);
+        spi.write(0b11111111);
+
+        spi.write(0b01001011);
+        spi.write(0b11111111);
+
+        //deselect chip
+        CSB.write(1);
+        wait_us(1);
+
+        wait_ms(100);
+
+
+    }
+    bool ch = true;
+    while (true) {
+        //data value
+        unsigned int data = 0xFFF;
+
+        //if more than 12 bits (0xfff) then set all bits true)
+        if (data > 0xFFF) {
+            data = 0xFFF;
+        }
+
+        //select chip
+        //bring cs low
+        CSB.write(0);
+        //wait a bit (more than 40ns)
+        wait_us(1);
+
+        //transfer a command (for channel a 0x4<<12 + data masked to 12 bits, for channel b 0x5<<12 + data masked to 12 bits)
+
+        int command = (0x01<<12);//default to channel a
+        /*if (!ch) {
+            command = (0x05<<12);
+            } */
+        data = command + (data&0xFFF);
+        //spi.write(data);
+        spi.write(data>>8);
+        spi.write(data & 0x00FF);
+        //bring cs high
+        CSB.write(1);
+        //wait a bit (more than 10-15ns)
+        wait_us(1);
+        wait_ms(10);
+        //leg.pc.printf("\r\nCommand: \t%i",command);
+
+        //leg.pc.printf("\r\nData: \t%i",data);
+        ch = !ch;
+    }
+}