I was trying a few days to enable PRU (BBB Ubuntu 12.04) and run a input
testing code using the pin P9_24.
MUX = pin 97 (44e10984) 00000006 pinctrl-single (SET to MODE 6)
P9 24 pr1_pru0_pru_r31_16.GPIO0_15: | MODE6 | INPUT
Nothing happens when I put the pin to 1.8 or GND
The ASM code is:
.origin 0
.entrypoint START
#define PRU0_ARM_INTERRUPT 19
#define AM33XX
#define GPIO1 0x4804c000
#define GPIO_CLEARDATAOUT 0x190
#define GPIO_SETDATAOUT 0x194
START:
// clear that bit
LBCO r0, C4, 4, 4
CLR r0, r0, 4
SBCO r0, C4, 4, 4
MOV r0, 1000000000 //# cycles
INPUTTEST:
WBS r31.t15 //Wait til GPIO-15-in is high... P9_24
SUB r0, r0, 1 //Subtract from counter
QBNE INPUTTEST, r0, 0 //Loop if counter not at zero
// Send notification to Host for program completion
MOV R31.b0, PRU0_ARM_INTERRUPT+16
MOV r0, 0
HALT
I don't know what I am doing wrong and in Internet are not examples for
INPUT tests.
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