S32K中的主题 Re: LPSPI CS Signal for S32K144

LPSPI CS Signal for S32K144

lzx — Wed, 16 Oct 2024 07:42:48 GMT

Hi,

I want to transfer data by LPSPI in S32k144(master mode). But I want to use other port(not the ports listed in LPSPI Peripheral Chip Select) as CS signal. For example, I want to use PTE9 as CS port. What should I do?

Thanks.

Re: LPSPI CS Signal for S32K144

Julián_AragónM — Wed, 16 Oct 2024 16:13:41 GMT

Hi @lzx,

You can use any port as GPIO and emulate the CS behavior. Please refer to the following community post: Solved: S32K144:SPI Transfer with GPIO as CS - NXP Community.

Best regards,
Julián

Re: LPSPI CS Signal for S32K144

lzx — Thu, 17 Oct 2024 14:48:55 GMT

Thanks for your reply. I have noticed this answer. But they controlled SPI by write registers directly. I want use LPSPI API to control the transfer process of SPI, like transfer data by `LPSPI_DRV_MasterTransfer()`. This API will set the CS signal automatic, so that I can't control CS signal. In this case, how can I control the CS signal as what I want?

Re: LPSPI CS Signal for S32K144

Julián_AragónM — Thu, 17 Oct 2024 19:35:11 GMT

Hi @lzx,

I believe the driver does not allow that. You can simply disable LPSPI PCS and use the GPIO function of the pin instead, no need to use registers directly.

Best regards,
Julián

Re: LPSPI CS Signal for S32K144

lzx — Tue, 22 Oct 2024 14:38:37 GMT

Hi,

Thanks for your reply. How could I disable LPSPI PCS?