Hi:
I am reading bootldr code(2.11.2 with JD's Mar-21-2001
patch).
The SA-1110 manual documents that after Reset, GPDR=0x0.
So I am confused here:
#ifdef CONFIG_ASSABET
ENTRY(GetSCR)
#define GPIO_2_9 (0x3fc)
ldr r0, GPIOBase
ldr r1, [r0, #SA1100_GPDR]
-- Here, according to the manural,r1=0x00000000.
and r1, r1, #GPIO_2_9
-- Here, r1=0x0, too. GPIO_2_9 is also for input. But they
should be output. Do I misunderstand something?
Waiting for help. Thank you.
str r1, [r0, #SA1100_GPDR]
mov r1, #GPIO_2_9
str r1, [r0, #SA1100_GPSR]
ldr r1, [r0, #SA1100_GPDR]
bic r1, r1, #GPIO_2_9
str r1, [r0, #SA1100_GPDR]
mov r2, #100
1: ldr r1, [r0, #SA1100_GPLR]
subs r2, r2, #1
bne 1b
and r2, r1, #GPIO_2_9
ldr r1, SCR
str r2, [r1]
ldr r1, [r0, #SA1100_GPDR]
and r1, r1, #GPIO_2_9
str r1, [r0, #SA1100_GPDR]
mov pc, lr
#endif
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