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Change Legacy SPI functions to SSP #59

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henrique-silva opened this issue Dec 5, 2016 · 1 comment
Open

Change Legacy SPI functions to SSP #59

henrique-silva opened this issue Dec 5, 2016 · 1 comment
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afc-bpm afc-timing enhancement

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@henrique-silva
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There are some discussions on the NXP Forum about the SPI Legacy interface being there only for code portability between LPC20xx and LPC17xx chips. All new designs are recommended to use SSP interfaces, which can operate in SPI mode.
@henrique-silva
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There's a known problem with the SSP interface module: the SSEL pin, if configured to operate in SPI mode, will latch after each 16bit transfer [1]. LPC support recommends that for transfers larger than 16bits,the SSEL pin should be set as GPIO and controlled by the driver implementation.

[1] - https://www.lpcware.com/content/forum/ssp-module-ssel-state

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@henrique-silva