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Evaluate the opportunity of a pull-down resistor for spi0_d0 and spi0_d1 pin on Bela cape #5

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giuliomoro opened this issue Jun 15, 2018 · 0 comments

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@giuliomoro
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giuliomoro commented Jun 15, 2018

When you want to force booting from the SD card, you hold press the USER button (which effectively shorts P8_43 to GND). This changes the boot order to:

  • SPI
  • SD card

Sometimes (often?) the board fails to boot, possibly because it receives some stray signal on spi0_d0 or spi0_d1 (check the BBB's manual to see which one is expected to be used for iincoming data). Possibly, adding a pull down there could resolve this issue.

This is more of a documentation note than an actual feature request, as a resistor there may have negative effects on the bandwidth of the SPI bus.

@giuliomoro giuliomoro changed the title Evaluate the opportunity pull-down resistor for spi0_d0 and spi0_d1 pin on Bela cape Evaluate the opportunity of a pull-down resistor for spi0_d0 and spi0_d1 pin on Bela cape Jun 15, 2018
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