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20b:software-adc_demo [2008/07/26 00:29]
newell created
20b:software-adc_demo [2008/07/26 00:31] (current)
newell
Line 1: Line 1:
 +===== ADC pin ID and demo program =====
 +
 +==== Description ====
 +
 +Demo program showing the four ADC input channels.
 +
 +==== Usage ====
 +
 +Boot calc into test mode (to allow stock firmware to configure and init the chip), ​
 +connect a debugger, halt the chip, download the image, and let 'er rip.
 +It'll probably corrupt anything you had in ram before.
 +
 +It works best if you can provide an analog signal to the four channels. ​ Full scale appears
 +to be about 1.8V, so you'll want to limit the signal amplitude.
 +
 +==== Download link ====
 +
 + ​{{20B:​adc_test.tgz}}
 +
 +==== Readme.txt ====
 +
 +Analog input demo.
 +
 +Convert and display the conversion data for the four ADC input channels.
 +Each channel is shown on the display as 3 hex digits, ranging from 0 to
 +0x3ff. ​ Full scale appears to be 1.8V DC.
 +
 +Runs from ram, Thumb mode, trashes memory, and requires some sort of JTAG
 +debugger to load and start the program. ​ OCD Commander reports a starting
 +address of 0x002FF000, in case your debugger can't figure it out.
 +
 +Source included, but don't expect much.
 +
 +Disclaimer: Yes, the code is ugly.  Fix it at your own risk.  Consider it
 +nothing more than a toy to demonstrate that we know a little about the
 +hardware.
 +
 +Happy HP Hacking!
  
20b/software-adc_demo.txt · Last modified: 2008/07/26 00:31 by newell