SPI1 Signals Muxed with a Peripheral?

Jerome Lieow

Hi,

When I run my program and initialize SPI1, the SPI1 signals get pulled low. However when I stop the program running I can see the correct SPI1 signals (number of clocks, data output from SIMO etc.).

This leads me to suspect that something within the DSP itself is pulling the SPI1 signals to a low state. I have tried disabling all the peripherals by switching all the peripherals' states to the "Disable State" in the MDCTL.NEXT register except for the ddr2_mddr peripheral as I was unable to. However I was still unable to solve the problem.

I am using an LCDK6748 DSP and running CCS6 with the chip support library and NDK. If anyone can shed some light on if I have to reconnect some pins or something I would greatly appreciate it, thank you!

Regards,
Jerome Lieow

over 10 years ago

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

Dear Jerome,
Let me try it on my LCDK board and update you.
It would be good if you share the code here or send the code to my email ID (x0213399@ti.com)

0 Jerome Lieow over 10 years ago in reply to Titusrathinaraj Stalin

Intellectual 270 points

Hi Titus,

I found out that by default, the GPIO2 bank was set as an input which continually pulled the SPI1 signals low. When I set the GPIO2 bank as an output, SPI1 worked perfectly.

Regards,
Jerome Lieow

0 Titusrathinaraj Stalin over 10 years ago in reply to Jerome Lieow

TI__Guru** 116100 points

Sounds good.
Thanks Jerome for the update.

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SPI1 Signals Muxed with a Peripheral?