topic Re: S32K142 RAM Allocation in S32K

S32K142 RAM Allocation

bjrajendra — Wed, 01 Jul 2020 11:14:58 GMT

Hello all,

I'm using S32K142 device and implementing the following.

Basically I'm passing 32-byte array and sending those via can. But I observed that the data changed during the variable got changed during the process & understood that there might be an issue with the memory allocation.

I observed that the device has two sections and allocates data. I used the default setting.

Kindly suggest How to allocate into the both RAM sections.

Raju

Re: S32K142 RAM Allocation

PetrS — Thu, 02 Jul 2020 12:29:38 GMT

Hi,

unfortunately I do not fully understand the question and the issue.

If you deals with filling message buffer data words then you can refer to

Transmit FlexCAN S32K148

If you want to have bigger payload in the CAN message (8 byte by default) then CAN FD feature have to be enabled and you need to choose payload size for message buffers using FDCTRL[MBDSRn] bit fields. Note for higher payloads the MBs address offset varies.

Refer to chapters 55.4.4 FlexCAN memory partition for CAN FD and 55.4.5 FlexCAN message buffer memory map of the RM.

BR, Petr

Re: S32K142 RAM Allocation

bjrajendra — Thu, 02 Jul 2020 13:31:55 GMT

Hi Petr,

Thanks for the response.

In fact, I'm passing a 32byte array over a pointer using a function as shown below.

void shareInfo(uint8_t *f_data)

Here the pointer f_data points to an 32-byte array. But during the transfer of the 32-byte data the array is getting modified because of the other function variables.

Kindly suggest some alternatives.

Raju

Re: S32K142 RAM Allocation

PetrS — Fri, 03 Jul 2020 07:45:51 GMT

Hi,

I'am afraid that without more explanation, code or project I am not able to suggest more.

BR, Petr