Let's see if we can't focus this discussion a little better. Is this the same
deal I face attempting to access GPIO? Joel said I need to use a
read-modify-write instruction, yet the TS sample code 'button.c' shows the
naive approach of using simple assignment in C. Thus the question to me is
does this sample code work? Why not?
/ filename button.c
// connect a button to DIO pin 1 and ground
// blinks green and red led on the ts-7200 when button is pressed
//
// compile arm-linux-gcc -o button button.c
//
#include<unistd.h>
#include<sys/types.h>
#include<sys/mman.h>
#include<stdio.h>
#include<fcntl.h>
#include<string.h>
int main(int argc, char **argv)
{
volatile unsigned int *PEDR, *PEDDR, *PBDR, *PBDDR, *GPIOBDB;
int i;
unsigned char state;
unsigned char *start;
int fd = open("/dev/mem", O_RDWR|O_SYNC);
start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd,
0x80840000);
PBDR = (unsigned int *)(start + 0x04); // port b
PBDDR = (unsigned int *)(start + 0x14); // port b direction register
PEDR = (unsigned int *)(start + 0x20); // port e data
PEDDR = (unsigned int *)(start + 0x24); // port e direction register
GPIOBDB = (unsigned int *)(start + 0xC4); // debounce on port b
*PBDDR = 0xf0; // upper nibble output, lower
nibble input
*PEDDR = 0xff; // all output (just 2 bits)
*GPIOBDB = 0x01; // enable debounce on bit 0
state = *PBDR; // read initial state
while (state & 0x01) { // wait until button goes low
state = *PBDR; // remember bit 0 is pulled up
with 4.7k ohm
}
// blink 5 times, sleep 1 second so it's visible
for (i = 0; i < 5; i++) {
*PEDR = 0xff;
sleep(1);
*PEDR = 0x00;
sleep(1);
}
close(fd);
return 0;
}
--- In wrote:
>
> > can someone confirm the DIO pins work on the ts-7260 using the provided
> > scripts ?
> >
> >
>
> Hello,
> probably the same problem,
>
> I am not able to control DIO pins from user space. Tried C code via
> registers, peekpoke, GPIO kernel modules, but nothing worked. The pins are
> still high (log 1). LED connected to the pin is still lighting.
>
> The only thing I managed is to read the pins, when I connect it to ground,
> I can read log 0, log 1 when disconnected.
>
> Thanks in advance for any tips..
>
> Dalibor
>
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