Al Williams
Si5351 library uses the Si configuration tool output to program frequencies via I2C
Revision 0:e9b74a8ed1d1, committed 2015-10-13
- Comitter:
- wd5gnr
- Date:
- Tue Oct 13 02:03:48 2015 +0000
- Commit message:
- Initial commit;
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r e9b74a8ed1d1 main.cpp
--- /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);
+ }
+}
diff -r 000000000000 -r e9b74a8ed1d1 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Oct 13 02:03:48 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/34e6b704fe68 \ No newline at end of file