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Hi all
find attached a small c programm to access the led gpio directly without
a kernel driver as a little example. It is not perfect but it does work
for my purposes.
kindly regards
rOger
Punky Tse schrieb:
> Please find the attached message from soekris for GPIO support on 4801.
> And does any body knows this patch also works on wrap? But anyway, this
> patch will go into the next kernel update.
>
> Mirko Buholzer wrote:
>
>> Does some one of you have some experience in programming gpio and
>> interrupts on a wrap board.
>> I would like to do a frequency counter on one of the GPIO ports and
>> cant find some good resources.
>>
>> Thanks in advance!
>> Regards, Mirko _______________________________________________
>> Voyage-linux mailing list
>> [email protected]
>> http://list.voyage.hk/mailman/listinfo/voyage-linux
>
>
>
>
>
> ------------------------------------------------------------------------
>
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| PGP Public Key -> http://www.icer.ch/contact/eisenecher_pub_key.txt
+---------------------------------------------------------------------
| Roger Eisenecher mailto:[EMAIL PROTECTED]
| ic engineering & research GmbH Tel: +41 (0)52/223'13'70
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| CH-8266 Steckborn http://www.icer.ch/
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/*
* led.c - a simple program to read/write led states of WRAP board.
* (c) 2005, ic engineering & research GmbH, Roger Eisenecher
*
* Usage: ./led [xyz]
*
* If called without params the program will display the
* current state of the Onboard LEDs.
*
* If you specify xyz, the corresponding leds will be
* modified: for each position (x=D1, y=D2, z=D3) you could
* specify 0 to switch off, 1 to swicht on, i or I for
* inverting or - to modify nothing.
*/
#include <stdio.h>
#include <unistd.h>
#include <asm/io.h>
#define GPIOBASE 0xF400
#define GPIO2 2 /* LED 1 (D3) */
#define GPIO3 3 /* LED 2 (D2) */
#define GPIO18 18 /* LED 3 (D1) */
int checkSC1100()
{
return (1);
}
void invertGPIO(const unsigned int uiGPIO)
{
unsigned char ucReg = inb(GPIOBASE+uiGPIO/8);
outb((ucReg & 1<<uiGPIO%8) ? ucReg & ~(1<<uiGPIO%8) : ucReg |
1<<uiGPIO%8, GPIOBASE+uiGPIO/8);
return;
}
void setGPIO(const unsigned int uiGPIO)
{
unsigned char ucReg = inb(GPIOBASE+uiGPIO/8);
outb(ucReg | 1<<uiGPIO%8, GPIOBASE+uiGPIO/8);
return;
}
void resetGPIO(const unsigned int uiGPIO)
{
unsigned char ucReg = inb(GPIOBASE+uiGPIO/8);
outb(ucReg & ~(1<<uiGPIO%8), GPIOBASE+uiGPIO/8);
return;
}
int getGPIO(const unsigned int uiGPIO)
{
return (int)((inb(GPIOBASE+uiGPIO/8) & 1<<uiGPIO%8)>>uiGPIO%8 ? 1 : 0);
}
int main(int argc, char **argv)
{
if (!checkSC1100())
{
printf("Sorry: This programm supports only SC1100
processor!!!\n");
exit(1);
}
/* Get access to the ports */
if (ioperm(GPIOBASE, 3, 1)) { perror("ioperm"); exit(1); }
/* if no argument given we will give out the actual state of the
leds... */
if (argc == 1)
{
printf("LED states D1:%s D2:%s D3:%s\n", getGPIO(GPIO18) ?
"off" : "on", getGPIO(GPIO3) ? "off" : "on", getGPIO(GPIO2) ? "off" : "on");
}
else
{
int i;
for(i=0; i<strlen(argv[1]); i++)
{
switch (argv[1][i])
{
case '-': /* Do nothing */
break;
case '0': /* Switch off led */
switch (i+1)
{
case 1: /* LED 3 (D1) */
setGPIO(GPIO18);
break;
case 2: /* LED 2 (D2) */
setGPIO(GPIO3);
break;
case 3: /* LED 1 (D3) */
setGPIO(GPIO2);
break;
default:
break;
}
break;
case '1': /* Switch on led */
switch (i+1)
{
case 1: /* LED 3 (D1) */
resetGPIO(GPIO18);
break;
case 2: /* LED 2 (D2) */
resetGPIO(GPIO3);
break;
case 3: /* LED 1 (D3) */
resetGPIO(GPIO2);
break;
default:
break;
}
break;
case 'I': /* invert led */
case 'i': /* invert led */
switch (i+1)
{
case 1: /* LED 3 (D1) */
invertGPIO(GPIO18);
break;
case 2: /* LED 2 (D2) */
invertGPIO(GPIO3);
break;
case 3: /* LED 1 (D3) */
invertGPIO(GPIO2);
break;
default:
break;
}
break;
default:
break;
}
}
}
/* We don't need the ports anymore */
if (ioperm(GPIOBASE, 3, 0)) { perror("ioperm"); exit(1); }
exit(0);
}
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