What is necessary to migrate from LPC1769 to LPC11U24 and LPC812?

Questions » What is necessary to migrate from LPC1769 to LPC11U24 and LPC812?

Chr Doerr

11 years, 7 months ago.

It was my understand that the mbed SDK abstracts away the underlying specifics of the hardware and code should run without adaptations on other mbed hardware. However, I have trouble getting a SPI SRAM to work properly on other platforms and appreciate any hints on whether I am missing something.

I have a library for the 23LCV1024 SRAM from Microchip (http://mbed.org/users/chrdoerr/code/23LC1024/) that runs fine on an mbed LPC1769. The same program fails however on the LPC800-MAX when using P0_15, P0_14, P0_12 for SPI (https://mbed.org/handbook/mbed-NXP-LPC800-MAX), I was assuming this might be due to an incorrectly defined switch matrix. The same code however also fails on an Seeeduino Arch (LPC11U24) with P0_9, P0_8 and P1_29 as SPI pins (http://mbed.org/platforms/Seeeduino-Arch/).

I triple-checked all cabling, switched memory chips etc., the very same program (except for SPI pin definitions) does run on the LPC1769 mbed but not on the other mbeds - what am I missing?

Hi,

Please note that Seeeduino Arch has reversed SPI pins. The issue is not present on Seeeduino Arch Pro though. You can read more about that here: http://mbed.org/questions/1586/Shouldnt-SCK-and-MOSI-on-JP1-be-swaped/

Cheers,
Mihail

posted by -deleted- 18 Mar 2014

1 Answer

Chr Doerr

poster

11 years, 7 months ago.

Thanks for your note Mihail, I have tried it with reversed SPI pins but still no luck.

Did you also make 100% sure your power and ground connections are correct? Looking at that code it is very simple and straightforward, that shouldn't give a problem with a different device.

posted by Erik - 18 Mar 2014

I measured VCC and VSS on all setups with a multimeter, 3.3V and 0V are where they should be.

posted by Chr Doerr 18 Mar 2014

Chr Doerr

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11 years, 7 months ago.