Diff: main.cpp

Revision:

0:e9b74a8ed1d1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 13 02:03:48 2015 +0000
@@ -0,0 +1,177 @@
+#include "mbed.h"
+
+// Simple driver for Si5351 -- Williams
+// Expects you to use the desktop configuration tool at
+// https://www.silabs.com/products/clocksoscillators/pages/timing-software-development-tools.aspx
+
+I2C i2c(dp5, dp27);  // change to suit your i2c -- I used an LPC1114
+
+DigitalOut myled(LED1);
+const int addr = 0xC0;  // note: address is x2 so really 0x60 shifted over
+
+// The SI tool for generating a clock plan will dump a large
+// text file (select export plan for others)
+// In there will be 232 lines of register "map"
+// You need entries 15-92 and 149-170
+// The entries will look like:
+// 15,00h
+// I used regular expressions in my editor (emacs)
+// to convert ,\(..\)h -> ,0x\1
+// Then I copy paste the lines I want to another buffer
+// and then replace
+// [0-9]+, -> ,
+// That is relace the nubers ahead of the commas with nothing
+// Then you can paste it below in map0 (15-92) and map1 (149-170)
+// You actually don't even need all of these for the little 3 channel
+// breakout board, but it is fast and simple to just blow it all out
+// NOTE: Do not replace the first byte of each array (15 and 149) as
+// these are the register addresses.
+
+char map0[] = { 15,   // registers 15-92
+                0x00
+                ,0x4F
+                ,0x6F
+                ,0x4F
+                ,0x80
+                ,0x80
+                ,0x80
+                ,0xC0
+                ,0xC0
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x01
+                ,0x00
+                ,0x10
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x01
+                ,0x00
+                ,0x0E
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x01
+                ,0x01
+                ,0xC0
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x01
+                ,0x43
+                ,0xE6
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x01
+                ,0x03
+                ,0x82
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+                ,0x00
+              };
+
+char map1[] = {
+    149,     // registers 149-170
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00
+};
+
+
+// Easily send a byte to a register
+void send(int r,int x)
+{
+    char cmd[2];
+    cmd[0]=r;
+    cmd[1]=x;
+    i2c.write(addr,cmd,2);
+}
+
+// Once the map arrays are set up, call this to load the chip with those values
+int updatemap(void)
+{
+    char cmd[5];
+    send(3,0xFF);  // disable everything
+    cmd[0]=16;
+    cmd[1]=cmd[2]=cmd[3]=0x80;
+    i2c.write(addr,cmd,4);
+    i2c.write(addr,map0,sizeof(map0));  // blow register map to chip
+    i2c.write(addr,map1,sizeof(map1));
+    send(3,0);  // turn everything back on
+    send(177,0xAC);  // reset PLLs
+
+    // To do: ought to make accessors to the map arrays to set different parameters
+    return 0; // To do: error checking
+}
+
+int main()
+{
+
+
+    // Blink a light so as to not be boring
+    updatemap();
+    while(1) {
+
+        myled = 1;
+        wait(0.2);
+        myled = 0;
+        wait(0.2);
+    }
+}