topic Re: S32k146 LPSPI0 doesn't work in S32K

S32k146 LPSPI0 doesn't work

12914A — Fri, 13 Sep 2024 09:30:42 GMT

Hi,

I tested the LPSPI example for S32k146, to add in future the communication with a sd-card via SPI. But it doesn't work. I use PTB0 - PTB3 (LPSPI0). While debugging, it stucks at the while loop in transmit / read function. I attach the functions (init, send, read).

Can anyone help?

Best regards

Sandra

Re: S32k146 LPSPI0 doesn't work

danielmartynek — Mon, 16 Sep 2024 06:54:30 GMT

Hi @12914A,

Can you scope the bus?

Is the LPSPI0 sending something on the bus?

How do you call the write_byte() and read_byte() functions?

Regards,

Daniel

Re: S32k146 LPSPI0 doesn't work

12914A — Mon, 07 Oct 2024 05:59:20 GMT

Hi Daniel,

thanks for your reply.

The CS and CLK line work as expected. But on the MOSI line there is no data.

Here is how we call the write_byte() function:

for (b = 0 ; b < 0x0f; b++) //Send min 74+ clocks
{ write_byte(0xff);
}

but it stay stuck in the write_byte() in the following line:

while(((LPSPI0->SR & LPSPI_SR_TDF_MASK)>>LPSPI_SR_TDF_SHIFT)==0);

What could be the problem?

Best regards

Sandra

Re: S32k146 LPSPI0 doesn't work

danielmartynek — Tue, 08 Oct 2024 07:27:37 GMT

Hello Sandra,

How many of the 128 CLK cycles do you see at the pin?

If you don't read the RX data from the RX FIFO, set CFGR1[NOSTALL].

BR, Daniel