Unable to write into GPIO registers

Hi Chitra,

I am adding comments to your code below.

ldr R12, PORTBASE             ; r12 = 0xfff7bc00, the address for GIOGCR0 register
mov R1, #0x1
str R1, [R12, #0]                    ; write 0x1 to GIOGCR0, releasing GIO module from reset

ldr R11, PORTADDRESS   ; r11 = 0xfff7bc34, address for GIODIRA
mov R2, #0xFF

str R1, [R11, #0]                   ; write 0x1 to GIODIR, making GIOA[0] as output
ldr R6, [R12, #4]                   ; read from GIOINTDET register

PORTADDRESS      .word 0xFFF7BC34
PORTBASE         .word 0xFFF7BC00

How do you determine that the writes are not successful? Please note that you do need to release the peripheral reset from the system module CLKCNTL register as well. This is done by setting the PENA (Peripheral Enable) bit before you write to the GIO register frame. You also need to enable clock to the GIO module by clearing the corresponding peripheral power down bit in the PCR (Peripheral Central Resource) controller module.

The system and PCR module setup would be done automatically for you if you use HALCoGen to generate the initialization sequence.

Regards, Sunil