Calculate MSCR number in SIUL

[thuan_lhm]

Hi,

I'm trying to use MCAL 4.3.1 to use FlexCAN. I'm using MPC5748G. I have made the configurations on EB Tresos 24.0.1.

I confuse about this parameter of FlexCAN_0_CAN0RX:

PortPinPcr

Description: Used to specify port configuration register: SIUL I/O Pin Multiplexed Signal
Configuration Registers (MSCR number).

Range: >=0 and <=263.

But in file: IO_Signal_Description_and_Input_Multiplexing_Tables_Rev6.xlsx (attached in MPC5748G Reference Manual):

Port

LVDS Pair Port

SIUL MSCR#

MSCR SSS

Function

Module

Description

Direction

PB[1]		17	0000_0000	GPIO[17]	SIUL2		I/O
PB[1]			0000_0001	E0UC_31_Y	EMIOS0		O
PB[1]			0000_0010	E2UC_5_Y	EMIOS2		O
PB[1]			-	WKPU[4]	WKPU		I
PB[1]			-	CMP0_3	CMP0		I
PB[1]		543	0000_0010	E0UC_31_Y	EMIOS0		I
PB[1]		589	0000_0010	E2UC_5_Y	EMIOS2		I
PB[1]		700	0000_0010	CAN0RX	FlexCAN_0		I
PB[1]		712	0000_0001	LIN0RX	LIN_0		I

=> SIUL MSCR number of FlexCAN_0_CAN0RX is 700 (Port PB[1]). It's out of range (>263).

So, how should I use the correct number of MSCR in this case?

Best Regards,

Thuan Le

[PetrS]

Hi,

substract 512 from given value, thus 700-512.

BR, Petr

[thuan_lhm]

Hi Petr,

Thank for your support.

But in the file "IO_Signal_Description_and_Input_Multiplexing_Tables_Rev6.xlsx", the maximum value of SIUL MSCR is 1020 (for port PD[15]). I think 1020-512 out of range too (>263).

Best Regards,

Thuan

[PetrS · Accepted solution]

Hi,

to set PB1 as CAN0RX two registers need to be configured; set IBE bit of respective MSCR register and put right SSS value into IMCR register, i.e.

SIUL2.MSCR[17].B.IBE = 1; /* Pad PB1: Enable pad for input */
SIUL2.IMCR[700-512].B.SSS = 2; /* CAN0_RX: connected to pad PB1 */ 

How this is done in Tresos, not sure.

BR, Petr