Hi,
I'm new to the PRUss of AM335X processor.
In order to learn PRU to control general GPIO like GPIO0_7 on the EVM, I wrote following code. But the GPIO0_7 has no action when following code was executed. Can you familiar with PRU help on this problem.
BTW: Since the EVM uses GPIO_7 to control the LCD backlight, I think the GPIO0 module should have been configured and enabled.Should I redo these in the PRU firmaware?
Thanks,
//*************************************************************//
#define PRU0_CNTL_REG 0x00026000
LDI r12.w0, PRU0_CNTL_REG & 0xFFFF
LDI r12.w2, PRU0_CNTL_REG >> 16
MOV32 r13, 0x5
SBBO r13, r12,4,4 //disable standby
MOV32 r13,3
SBBO r13, r12,0x28,4 //enable offset of -0x0008_0000
#define GPIO_ADDRESS 0x44E07100
LDI r12.w0, GPIO_ADDRESS & 0xFFFF
LDI r12.w2, GPIO_ADDRESS >> 16
LBBO r13, r12,0x34,4
MOV32 r14, 0xFFFFFF7F
AND r13,r13,r14
SBBO r13,r12,0x34,4 //set GPIO0_7 to output
MOV32 r13,0x80
SBBO r13,r12,0x90,4 //Clear GPIO0_7
MOV r14,1
Delay2:
ADD r14,r14,1
QBGT Delay2, r14, 0xFF
MOV32 r13,0x80
SBBO r13,r12,0x94,4//Set GPIO0_7
MOV r14,1
Delay3:
ADD r14,r14,1
QBGT Delay3, r14, 0xFF
MOV32 r13,0x80
SBBO r13,r12,0x90,4 //Clear GPIO0_7 again.