SPI issue S32k144 interfacing with RF Chip

[Adhi_11]

Hallo, I am a new user to S32k1xx series of MCU and working on my master thesis. I`m having some trouble interfacing an RF Chip to my µc. Once my API is executed, it is reported as hardware fault, and i cant identify the mistake. I want to just check if the SCK is active and MOSI is sending the data. Can someone please give me some guidance, i am not able to find support for this project, as S32k1xx is fairly new to some developers i know.

[daniellet]

Hello @Adhi_11. Were you able to resolve this problem? I am currently experiencing the same issue. 

[Adhi_11]

Thanks for checking. But now there seems to be a problem. I saw the output in my DSO a few days ago. But now its not working again. I even put the data tranmsit function on the for loop and it worked, but now the execution stops at the check TX fifo loop, what is even more strange is i tried the same for the example LPSPI program(non-processor expert) and the same problem. Changing the non stall bit on CFGR1 helped me last time. I don't understand this, is it the problem from hardware side. I did not made a changes on the example LPSPI, just removed the recieved function in void main, still the execution halts at the while loop as shown in picture. Kindly help me understand why. 

 

[Adhi_11]

Hello Petr,

I have modified the same and tried to send the data again, and unfortunately its not working for me. I have set PTB17 as GPIO, output as chip select. Theres also a function called chip enable, on PTD0 which is internally connected to BLUE LED. So i think it is the problem with my SPI transmit function, because at the end of my NRF24_Init() the chip enable should be high or maybe i didnt configure a delay between transfers. All my transfers should be 8 bits to the chip. Could you please replicate this behaviour and see if you can get the SCK and MOSI running, also please advice me what to do because i am stuck here. 

Regards,

Adhi

[PetrS]

Hi,

please use attached code. I did modification in pin init and CS handling. Also I modified nrf24_WriteReg function. Below is what I see for NRF24_Init

BR, Petr

[PetrS · Accepted solution]

Hi,

seems you did not enable clock properly for PORTC. So change a line

PCC-> PCCn[PCC_PORTD_INDEX] = PCC_PCCn_CGC_MASK; /* Enable clock to PORT D */

with 

PCC-> PCCn[PCC_PORTD_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable clock to PORT D */
PCC-> PCCn[PCC_PORTC_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable clock to PORT C */

then it passes port init and you should see signal on SPI output.

BR, Petr