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qc2012

Member Since 14 Sep 2012
Offline Last Active Mar 03 2013 01:53 AM

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In Topic: SPI Clock State Question

27 December 2012 - 08:07 PM

Mark,

You may want to try changing the clock frequency for the SPI interface. I solved my problem by merely changing the clock frequency from 1000 KHz to 1250 KHz. I found It worked at 4000 KHz down to about 1150 KHz. E.g.:

SPI_CS_CONFIG = new SPI.Configuration(MP3_XCS_PIN, false, 0, 0, false, true, 1000, SPI.SPI_module.SPI1); // fails 9 of 10 trials

SPI_CS_CONFIG = new SPI.Configuration(MP3_XCS_PIN, false, 0, 0, false, true, 1250, SPI.SPI_module.SPI1); // works 10/10 trials

Hope this helps as a workaround,

Quentin

In Topic: SPI Clock State Question

19 December 2012 - 04:15 AM

I'm also willing to test. In my case I'm running 4.2.1.2 firmware (which fixed my I2C problem) and observe that SPI is not working regardless of frequency. I took some photos of the SPI output on my logic analyzer (pin 6 is CS for the slave) for both Netduino Plus 2 and Netduino Plus. Hope this helps. Note that the NP was running @ 4 MHz and the NP2 @ 1 MHz. The NP2 doesn't make it as far in the initialization routine. Netduino Plus @ 5 uSec https://docs.google....aElmZzc0dHZxUzA Netduino Plus @ 2 uSec https://docs.google....NVFNNmMxS3drTm8 Netduino Plus @ 1 uSec https://docs.google....QWVXUk4xRC1vRkU Netduino Plus 2 @ 10 uSec (SPI may be running @ 1 MHz) https://docs.google....ZFpRYkYzRTJRSm8

qc2012

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In Topic: SPI Clock State Question

In Topic: SPI Clock State Question

qc2012

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In Topic: SPI Clock State Question

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