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startup: Fixed measure_clk to return kHz instead of MHz. 

The original code had iterated 10,000,000 times and taken the elapsed 
time divided by 10,000, to yield kHz which is mathematically correct 
only if we were measuring time in seconds, but we are measuring time in 
 milliseconds, so the correct divisor is actually 10,000,000.  Previous 
code would report 0.500 for actual measured speed of 500 kHz.

Change-Id: Iba4c4961fe3973e7ccfa6dfa11d606a966ceb50c
Signed-off-by: Ed Beroset <beroset@ieee.org>
Reviewed-on: http://openocd.zylin.com/2573
Tested-by: jenkins
Reviewed-by: Jens Bauer <jens@gpio.dk>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
This commit is contained in:
Ed Beroset 2015-03-03 15:01:38 -05:00 committed by Paul Fertser
parent 7a7086e644
commit daf9bcf77f
1 changed files with 3 additions and 2 deletions
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5
src/jtag/startup.tcl
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@ -81,8 +81,9 @@ proc srst_asserted {} {
# measure actual JTAG clock # measure actual JTAG clock
proc measure_clk {} { proc measure_clk {} {
set start_time [ms]; set start_time [ms];
runtest 10000000; set iterations 10000000;
echo "Running at more than [expr 10000.0 / ([ms]-$start_time)] kHz"; runtest $iterations;
echo "Running at more than [expr $iterations.0 / ([ms]-$start_time)] kHz";
} }
add_help_text measure_clk "Runs a test to measure the JTAG clk. Useful with RCLK / RTCK." add_help_text measure_clk "Runs a test to measure the JTAG clk. Useful with RCLK / RTCK."