Diff: main.cpp

Revision:

0:bea0000c5526

Child:

1:44d13dabc8e9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Feb 09 23:13:55 2014 +0000
@@ -0,0 +1,85 @@
+#include "mbed.h"
+
+/* 
+ * A simple single freq AD9850 Arduino test script
+ * Original AD9851 DDS sketch by Andrew Smallbone at www.rocketnumbernine.com
+ * Modified for testing the inexpensive AD9850 ebay DDS modules
+ * Pictures and pinouts at nr8o.dhlpilotcentral.com
+ * 9850 datasheet at http://www.analog.com/static/imported-files/data_sheets/AD9850.pdf
+ * Use freely
+ */
+ 
+ 
+ //efine W2_CLK      // connect to AD9850 module2 word load clock pin (CLK) 
+ //efine W1_CLK 12   // connect to AD9850 module1 word load clock pin (CLK)
+ //efine FQ_UD p5    // connect to freq update pin (FQ)
+ //efine DATA 10     // connect to serial data load pin (DATA)
+ //efine RESET 9     // connect to reset pin (RST).
+ 
+ #define pulseHigh(pin) {pin = 1; pin = 0; }
+
+
+
+ // configure data pins for output
+  DigitalOut FQ_UD(p8);
+  DigitalOut W_CLK(p7);
+  DigitalOut DATA(p5);
+  DigitalOut RESET(p15);
+  
+  
+
+ 
+ // transfers a byte, a bit at a time, LSB first to the 9850 via serial DATA line
+void tfr_byte_module1(char data)
+{
+  for (int i=0; i<8; i++, data>>=1) {
+  DATA = (data & 0x01);
+  pulseHigh(W_CLK);   //after each bit sent, CLK is pulsed high
+  }
+}
+
+void tfr_byte_module2(char data)
+{
+  for (int i=0; i<8; i++, data>>=1) {
+    DATA =  (data & 0x01);
+    pulseHigh(W_CLK);   //after each bit sent, CLK is pulsed high
+  }
+}
+
+
+// frequency calc from datasheet page 8 = <sys clock> * <frequency tuning word>/2^32
+void sendFrequency(double frequency) {
+  int32_t freq = frequency *1e6 * 4294967295/125000000;  // note 125 MHz clock on 9850
+  for (int b=0; b<4; b++, freq>>=8) {
+    tfr_byte_module1(freq & 0xFF);
+  }
+  tfr_byte_module1(0X38);   // Final control byte, all 0 for 9850 chip
+ }
+
+
+int main()
+{
+double frequency;
+
+// Initialise the AD9850 module
+ pulseHigh(RESET);
+ pulseHigh(W_CLK);
+ pulseHigh(FQ_UD);  // this pulse enables serial mode - Datasheet page 12 figure 10
+
+
+
+
+
+while(1)
+  {
+   frequency = 10.0034;
+     {
+      sendFrequency(frequency);
+      pulseHigh(FQ_UD);
+     wait(5.0);
+          } 
+ }
+
+}
+
+