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ben-wpan/atusd/ERRATA
Werner Almesberger 9ad96bd5f9 Board bringup: talk to the chip and read IDs.
- atusd/ERRATA: mention that the reset circuit can go, as expected
- atusd/tools/Makefile: add include path to at86rf230.h
- atusd/tools/lib/atusd.c: include atusd.h, for consistency checking
- atusd/tools/lib/atusd.c (spi_begin, spi_end, spi_data_in, spi_data_out,
  spi_send_partial, spi_recv, spi_finish, spi_send): low-level functions
  to access our modified SPI
- atusd/tools/lib/atusd.h, atusd/tools/lib/atusd.c (atusd_reg_write,
  atusd_reg_read): register read and write access
- atusd/tools/try.c: read and print chip IDs
2010-09-05 16:59:59 -03:00

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- changed C7 to 1 nF to debug a signal attenuation problem. Turned out to be
a bad trace. According to simulations, 22 pF should be more than enough.
- added wire connecting uSD-side ground plane to ground plane at outer edge,
to improve CLK signal return. (Probably unnecessary, too.)
- the footprint of the transistor (Q1) is reversed :-( It works after
converting the chip from SOT to PLCC.
- not an erratum, but with experiments showing power-on reset to be
reliable, we can consider removing the hardware reset circuit. This will
also simplify the layout.