MSP430FR6877: MSP430F437IPN to MSP430FR6877 ISR porting difficulty

KAR

Part Number: MSP430FR6877

Hello,
I am currently looking in to porting some code operating on an MSP430F437IPN device to a device working with an MSP430FR6877. The majority of the other code has been altered to work on the system with no issues but I am having some trouble within the interrupt service routine.

In the original system the following is used

BIC.B #WDTIE, &IE1 ; Disable WDTI

; Output a pulse or check if inter-
; pulse timeout is done.

PUSH R12
PUSH R13
PUSH R14
PUSH R15
CALL #Pulse_Output1
POP R15
POP R14
POP R13
POP R12

BIS.B #WDTIE, &IE1 ; Enable WDTI
RETI

However when converting over based on the SFR in the new MCU with the following:

BIC.B #WDTIE, &SFRIE1 ; Disable WDTI

; Output a pulse or check if inter-
; pulse timeout is done.

PUSH R12
PUSH R13
PUSH R14
PUSH R15
CALL #Pulse_Output1
POP R15
POP R14
POP R13
POP R12

BIS.B #WDTIE, &SFRIE1 ; Enable WDTI
RETI

I get Error[431]: Accessing SFR using incorrect size

on the lines containing BIC.B #WDTIE, &SFRIE1 ; Disable WDTI and BIS.B #WDTIE, &SFRIE1 ; Enable WDTI

Would you happen to know what is going wrong?

over 1 year ago

0 Bruce McKenney47378 over 1 year ago

Guru 89760 points

Per User Guide (SLAU367P) Table 1-12, SFRIE1 expects word access, so you probably want something like:

> BIS.W #WDTIE, &SFRIE1 ; Enable WDTI

Example msp430fr69xx_wdt_01.asm may be useful:

https://dev.ti.com/tirex/explore/node?node=A__AOPVFthea1ToO1YQYxIF6A__msp430ware__IOGqZri__LATEST

[Edit: Minor re-wording.]

0 KAR over 1 year ago in reply to Bruce McKenney47378

Prodigy 10 points

Thank you,

I will implement this change and get back to you.

0 David Schultz over 1 year ago in reply to Bruce McKenney47378

Guru 19645 points

Bruce McKenney47378 said:
Per User Guide (SLAU367P) Table 1-12, SFRIE1 expects word access, so you probably want something like:

The device header file includes:

#define __MSP430_BASEADDRESS_SFR__ 0x0100
#define SFR_BASE               __MSP430_BASEADDRESS_SFR__

sfr_w(SFRIE1);                                /* Interrupt Enable 1 */
sfr_b(SFRIE1_L);                              /* Interrupt Enable 1 */
sfr_b(SFRIE1_H);                              /* Interrupt Enable 1 */

SFRIE_L being the one to use with byte access.

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MSP430FR6877: MSP430F437IPN to MSP430FR6877 ISR porting difficulty