Diff: Max5250.cpp

Revision:

1:82f2ef52759e

Child:

2:d0778c36d28d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Max5250.cpp	Wed Nov 14 20:01:50 2012 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+#include "Max5250.h" 
+
+ SPI spi(p5, NC, p7); 
+ DigitalOut cs(p8);
+ Serial dbg1(USBTX, USBRX);
+ 
+int DAC_Setup(void) {
+    spi.format(16,0);
+    spi.frequency(1000000);
+    return 1;
+    }
+
+/**********************************************************************
+* Configures the command from the data bytes and writes to the SPI  
+* MAX5250 command structure: A1,A0, C1,C0, D9..D0, S1,S0
+* A1,A0 - DAC addr, C1,C0 = 3 for immediate update, 1 for deferred update
+* D9..D0 = 10bit value [Vo = (Vref* D/1024)(Gain)] Gain = 1 in this desgin
+* S1,S0 = always zero
+*/
+int SetDAC(uint8_t *data){
+    int cmd;
+    
+    data[2] &= 3; //Fix to 3 max.
+    cmd = (data[1] << 12);
+    cmd += (data[2] << 10);
+    cmd += (data[3] << 2);
+    dbg1.printf("cmd = %0x\n", cmd);
+    
+    cs = 0;
+    spi.write(cmd);
+    cs = 1;
+    return 1;
+    }
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