SYNOPSIS

ao-bitbang

DESCRIPTION

ao-bitbang connects through a CP2103 usb-to-serial converter and uses the GPIO pins to communicate with the debug port on a cc1111 device. It provides raw access to the debug pins to help debug the lowest level communication path.

USAGE

ao-bitbang reads a sequence of bit manipulations from stdin, sends them to the device and reports status on stdout.

Each line on stdin should contain a single letter command for each of the three debug lines on the cc1111 -- clock, data and reset. Each bit can be in one of three states -- on (C, D or R), off (.) or tri-state (-) for input. Empty lines, or lines starting with '#' are ignored. Anything beyond the last bit in a line is also ignored. The bits must be listed in the correct order, and the 'on' values must match the desired bit.

EXAMPLE

Reset the target device

 # reset
 C D R
 C D R
 C D R
 C D R

Get Chip ID

 #
 # Debug mode - drive RESET_N low for two clock cycles
 #
 C D R
 . D .
 C D .
 . D .
 C D .
 . D R
 #
 # GET_CHIP_ID
 C . R  0
 . . R
 C D R  1
 . D R
 C D R  1
 . D R
 C . R  0
 . . R
 C D R  1
 . D R
 C . R  0
 . . R
 C . R  0
 . . R
 C . R  0
 . . R
 #
 # start reading again
 #
 C D R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C - R
 . - R
 C D R

AUTHOR

Keith Packard