Radio driver

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Revision as of 17:52, 10 April 2008 by Brano (talk | contribs) (New page: == Problem description == * DMA version of the radio driver (which is the default) does not work, * SPI version is getting RX fifo underflows for messages larger than 10 bytes plus header...)
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Problem description

  • DMA version of the radio driver (which is the default) does not work,
  • SPI version is getting RX fifo underflows for messages larger than 10 bytes plus header,
  • using 1.2.6 version of HalPXA27xSpiPioM.nc resolves the problem, but in this version, CPU spins on slow SPI read/writes which is bad

Problem fixed

  • the problem was in HalPXA27xSpiPioM.nc file: in the SSP.interruptSSP(), original code gets the length of the fifo (uiFifoLevel) from the SSSR register. but data sheet says that SSSR_FRL actually contains fifolength-1. so we have to take SSSR_RFL+1
  • DMA still does not work - maybe for the same reason?
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