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base fork: analog10/UART_DCO_Calibrator
base: f4c9e63691
...
head fork: analog10/UART_DCO_Calibrator
compare: bfbb4bf923
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Showing with 33 additions and 1 deletion.
  1. +32 −0 README
  2. +1 −1  main.c
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32 README
@@ -1,5 +1,36 @@
When your micro's main clock frequency is software configurable, why not set it exactly to what you want?
+REQUIREMENTS:
+-------------
+libftdi
+mspgcc
+mspdebug
+
+USAGE:
+------
+
+By default, this will determine the constants for 16MHz.
+1) Download, extract, etc and run make. If this does not work, check that the requirements are fulfilled.
+2) Flash the program to your chip, something like (for the LaunchPad)
+
+mspdebug rf2500 'prog UART_CALIBRATION.elf'
+
+3) Run the host calibration program
+
+./host_calibrate
+
+4) You will see a long stream of characters. See the source for details.
+At the end you will see the DCO and BCSCTL1 constants printed.
+
+5) If you want to recalibrate, reset your micro via a reset button or
+
+mspdebug rf2500 'reset'
+
+and run step 3 again.
+
+BACKGROUND:
+-----------
+
This is a combination of two programs, one on the host, and one on the micro, that communicate to each other to get the DCO to a target frequency.
Supported host hardware:
@@ -15,4 +46,5 @@ This work is based on goldilocks.cpp from Rick Kimball's fabooh project
https://github.com/RickKimball/msp430_code/blob/master/fabooh/examples/serial/dco_calibrate/goldilocks.cpp
LICENSING:
+----------
Please see source files.
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2  main.c
@@ -8,7 +8,7 @@
#endif
#ifndef TARGET_FREQUENCY
-#define TARGET_FREQUENCY 15964200L
+#define TARGET_FREQUENCY 16000000L
#endif
/* The loop takes 4 cycles per iteration, so divide delay by 4. */

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