Revision 5:1ce3ec1e5f8b, committed 2014-04-13

Comitter:

cassar10

Date:

Sun Apr 13 19:45:35 2014 +0000

Parent:

4:0c327b37ddc1

Commit message:

Set SPI Frequency during initialization. Test program includes for loop to ramp up to reference voltage.

Changed in this revision

--- a/AD7390.cpp	Sun Apr 06 20:19:56 2014 +0000
+++ b/AD7390.cpp	Sun Apr 13 19:45:35 2014 +0000
@@ -1,37 +1,39 @@
 # include "AD7390.h"
 #include "mbed.h"
 
-AD7390::AD7390(SPI& _spi, PinName resetpin, PinName latchpin) : //Mosi, sclk 2x digital out refV, previously missed scope operator.
+AD7390::AD7390(SPI& _spi, PinName resetpin, PinName latchpin) : //Mosi, sclk 2x digital out refV
     spi(_spi),reset(resetpin), latch(latchpin){
     }
-    void AD7390::Init()
+    void AD7390::Init(int Frequency)
     {
         //Vout = (Vref*D)/2^n
+        spi.frequency(Frequency);
         spi.format(12,0);
-        latch = 1;                                      //Pull low to pass shift register to DAC register
+        latch = 1;                                              
+        reset = 0;
         reset = 1;
     }
     
-    void AD7390::Reset()                                //Reset ADC to 0V by pulling reset pin low
+    void AD7390::Reset()                                        
     {
         reset = 0;
-        reset = 1;                                      //Set back to high so it can be written to again
+        reset = 1;                                              
     }
-    void AD7390::Latch()                                //Latch data from shift register to DAC
+    void AD7390::Latch()                                        
     {
         latch = 0;
         latch = 1;
     }
-    void AD7390::Write(float Volts, float RefV)                     //write will require seperate latch after
+    void AD7390::Write(float Volts, float RefV)                 //write will require seperate latch after
     {
         unsigned int send = 0x0000;
         send = (unsigned int) (4096/RefV)*Volts;
         spi.write(send);
     }
-    void AD7390::WriteL(float volts, float RefV)                    //Same as write but with latch attached
+    void AD7390::WriteL(float volts, float RefV)                //Same as write but with latch attached
     {
         unsigned int Send = 0x0000;
-        Send = (unsigned int) (4096/RefV)*volts;      //parse float into unsigned int to send to DAC
+        Send = (unsigned int) (4096/RefV)*volts;                //parse float into unsigned int to send to DAC
         spi.write(Send);
         latch = 0;
         latch = 1;

--- a/AD7390.h	Sun Apr 06 20:19:56 2014 +0000
+++ b/AD7390.h	Sun Apr 13 19:45:35 2014 +0000
@@ -3,14 +3,14 @@
 
 #include "mbed.h"
 
-class AD7390    {           //Create an AD7390 instance
+class AD7390    {                                                //Create an AD7390 instance
     SPI& spi;
     DigitalOut reset, latch;
     public:
         AD7390(SPI& spi, PinName resetpin, PinName latchpin);    //RefV set up for user reference voltage
         void Reset();
         void Latch();
-        void Init();
+        void Init(int Frequency);                                //Set SPI frequency during initialisation
         void Write(float Volts, float RefV);
         void WriteL(float volts, float RefV);
     private:

--- a/main.cpp	Sun Apr 06 20:19:56 2014 +0000
+++ b/main.cpp	Sun Apr 13 19:45:35 2014 +0000
@@ -3,22 +3,15 @@
 
 SPI spi(p5,p6,p7);
 AD7390 Test(spi,p10,p11);
-DigitalOut Led(LED1);
 
 int main(){
-    Test.Init();
+    Test.Init(10000000);
 while (true){
     Test.Reset();
-    Test.WriteL(2.5,3.3);
-    Led = 1;
-    wait(5);
-    Test.Reset();
-    Led = 0;
-    Test.WriteL(1.5,3.3);
-    Led = 1;
-    wait(5);
-    Led = 0;
-    
+    for (float V = 0; V !=3.3; V=V+0.005){
+        Test.WriteL(V,3.3);
+        wait(0.02);
+    }
 
 }
 }