A Scheme Interpreter for ARM Microcontrollers:
ChangeLog for Snapshot 00.0171

Changes from version 00.0160:

• One new board is supported: TI BeagleBoard (Revision B7, TI OMAP3530, Cortex-A8, ARMv7A). The implementation uses default speed parameters set by X-Loader and U-boot (pre-flashed on the board).


• The file writing bug has been corrected on the LPC2478-STK.


• USB (device) support has been added to the LPC2478-STK and LPC-H2888. On the LPC-H2888 this required reducing the clock speed from 60MHz to 48MHz.


• The USB power request in the configuration descriptor has been lowered from 500mA to 100mA.


• The bug whereby an empty vector would print incorrectly has been corrected.


• The file reading subsystem has been modified to allow reading files that contain comments and other punctuation (to allow on-chip editing of files in future examples and versions).


• The isrbrk: machine code function is now exported to the Scheme top-level as _IBK to ease development of input port ISRs (eg. for keyboards).


• The code was modified to make it easier to change a uart's input buffer from the default READBUFFER. More precisely, the READBUFFER is no longer hardcoded in uart read functions, but it is still hardcoded in the uart ISR.


• Some code inlining has been performed and some memory allocation processes have been grouped to improve performance. The resulting performance gain appears to be in the percent range.


• Where appropriate, program examples are under development to illustrate the application of the new features described above.

Last updated May 11, 2009