Clock calculator python script

1 files changed, 22 insertions, 0 deletions

diff --git a/clk_calc.py b/clk_calc.py
new file mode 100644
index 0000000..11eda9f
--- /dev/null
+++ b/clk_calc.py
@@ -0,0 +1,22 @@
+# frequ in MHz
+f=18.432
+ftarg=64.0
+
+# PLL range: 60 MHz <= PLL <= 130 MHz
+# MUL range: 4 <= MUL <= 7
+
+min_err_val=[1.0, 0.0]
+min_err=f
+
+for mul in range(1, 8):
+    for div in range(1, 0x20):
+        err=abs((f*mul/(1.0*div)) - ftarg)
+        print(mul, div, err)
+        if(err < min_err):
+            min_err_val=[mul, div]
+            print("last minerr: %f, new minerr: %f, mul: %d, div: %d" % (min_err, err, mul, div))
+            min_err=err
+
+print("MUL-DIV values:")
+print(min_err_val)
+print("Absolute error: %0.2f %% " % ((f*min_err_val[0]/min_err_val[1]-ftarg)/ftarg*100))