Lib str710 and reentrant IRQ

pchignon · ‎2005-09-28

Posted on September 28, 2005 at 14:13

pchignon · ‎2005-09-28

Posted on September 28, 2005 at 14:05

Hi,

I just noticed that the lib str710 doesn't re enable IRQ in the irq handler :

IRQ_to_SYS MACRO

MSR cpsr_c,#0x1F ; Switch to SYS mode

STMFD sp!,{lr} ; Save the link register.

ENDM

The 1F mode is the system and user mode but nothing re-enable the interrupts. Is there a good reason for this?

Is it possible to re-enable interrupt that way : MSR cpsr_c,#0x1F |I_Bit |F_Bit ; Switch to SYS mode

I think yes because the EIC component manage priority. Isn't it.

Thanks,

Ludo

pchignon · ‎2005-09-28

Posted on September 28, 2005 at 14:08

My mistake,

I confused with the meaning of the I_Bit.

Ludo