calculation of TOTAL_FIFO_BYTES in s32k144 UDS Bootloader example

[KKumar]

Hello NXP,

"""

#define FIFO_NUM (3u) /*Fifo num*/

#define TOTAL_FIFO_BYTES (500u + 99u) /*config total bytes*/

#define STRUCT_LEN (20u) /*every fifo struct used space*/

#define TOTAL_BYTES ((STRUCT_LEN) * (FIFO_NUM) + TOTAL_FIFO_BYTES) /*config total bytes*/

"""

This is code from S32K144_UDS_BOOTLOADER PROJECT.

I just want to ask , how TOTAL_FIFO_BYTES has been calculated to (500u + 99u) and why STRUCT_LEN is 20u ??

[lukaszadrapa]

Hi,

STRUCT_LEN is a length of tFifoInfo which is 20.

It seems the documentation does not corresponds to the latest source files because I can see this in the multi_cyc_fifo.h:

#ifdef EN_LIN_TP
#define TOTAL_FIFO_BYTES (450u) /*config total bytes*/
#elif defined EN_CAN_TP
#define TOTAL_FIFO_BYTES (800u) /*config total bytes*/
#else
#define TOTAL_FIFO_BYTES (100u) /*config total bytes*/
#endif

That should be expected max size considering different TP layers.

Regards,

Lukas

[KKumar]

Hi Lukaszadrapa,

how has max size of TOTAL_FIFO_BYTES been calculated ??

and could you share the link of latest source file??

[lukaszadrapa]

That was copied from this file:

..\S32K1xx_unified_bootloader_demo_V1.0\S32K1xx\UDS_stack\unified_bootloader_stack\Source\FIFO\inc\multi_cyc_fifo.h

from this package:

https://www.nxp.com/downloads/en/snippets-boot-code-headers-monitors/unified_bootloader_framework.zi...

which was uploaded 2020-03-23.

I believe you have the same version.

Regards,

Lukas