Revision 0:bce9b1450b19, committed 2012-06-13

Comitter:

JimmyTheHack

Date:

Wed Jun 13 23:41:08 2012 +0000

Child:

1:679fa19d91b2

Commit message:

changed to make use of pre-allocated SPI channels.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DAC.cpp	Wed Jun 13 23:41:08 2012 +0000
@@ -0,0 +1,16 @@
+#include "DAC.h"
+
+/*SPI Channels */
+SPI SPI_A(p5, NC, p7);  //since we only have two SPI channels, which must be shared, define them here.
+SPI SPI_B(p11, NC, p13);
+
+/*Initialize DAC */
+DAC::DAC(int SPIchannelNum, PinName _CS, PinName _LDAC) : CS(_CS), LDAC(_LDAC){  
+    if (SPIchannelNum ==1){
+        DACspi = &SPI_B;
+    }  
+    else{
+        DACspi = &SPI_A;
+    }
+    (*DACspi).format(16,0);
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DAC.h	Wed Jun 13 23:41:08 2012 +0000
@@ -0,0 +1,21 @@
+#ifndef DAC_H
+#define DAC_H
+#include "mbed.h"
+
+//a basic parent library for use with DACs controlled via SPI.  Individual hardware implementations will need their own libraries.
+class DAC
+{
+    public:
+    DAC(int SPIchannelNum, PinName CS,  PinName LDAC);
+    virtual void write(int millivolts) =0; //write a value to the Digital Analog Converter    
+    
+    //DigitalOut SCK;
+    DigitalOut CS;  //serial chip select pin
+    DigitalOut LDAC; //synchronize pin to update both DACs together    
+    SPI * DACspi;
+};
+
+extern SPI SPI_A;  //channel A SPI (pins 5,7)
+extern SPI SPI_B;  //channel B SPI (pins 11,13)
+
+#endif //DAC_H
\ No newline at end of file