SPI config

[bensonyeung]

I was using FRDM-KL25Z SPI example code but it seems like it is only limited to 8 or 16-bit data. Is there any other way I can use other method maybe using GPIO and create a 24 or 32bit data instead?

Benson

[jeremyzhou]

Hi Benson,

I think you have to use the GPIO to simulate the SPI if you want to achieve the 24 or 32 bit serial frame size.
Have a great day,
Ping

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[bensonyeung]

Do you know any example code that use GPIO to simulate SPI?

Benson

[egoodii]

I put some optimized full GPIO SPI code in:

Confirming K22F Clock Frequency

[egoodii]

You should be able to use the SPI hardware/code like it is, EXCEPT you just control the slave Chip Select with manual GPIO commands to enclose 'as many transfer sections' as need to be considered by the slave as 'one transaction'.