#include <stdlib.h>
#include <malloc.h>

#include <stdio.h>
#include <termio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <string.h>

void *mapped_base;

#define GPIO_BA 0xB8003000

#define MAP_BASE (GPIO_BA)
#define MAP_SIZE 4096Ul
#define MAP_MASK (MAP_SIZE - 1)

#define GPIOH_DIR *(int*)(mapped_base+0x54)
#define GPIOH_OUT *(int*)(mapped_base+0x58)

int main(void)
{
int fd;
printf("\nResearch of gpio frequency (W90P950, NUC950) by Jury093 v0.01\n");
printf("Use Pin N168->IRQ1\n");
//-------------------------------------------------
// mapping GPIO Register
if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1)
{
printf("Cannot open /dev/mem.\n");
exit(EXIT_FAILURE);
}
printf("/dev/mem opened.\n");
mapped_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, MAP_BASE & ~MAP_MASK);
if (mapped_base == (void *) -1)
{
printf("Memory mapping error.\n");
exit(EXIT_FAILURE);
}
mapped_base+=(MAP_BASE & MAP_MASK);
printf("Target address mapped 0x%08x-->0x%08x\n",(int) MAP_BASE,(int)mapped_base);
// -----------------------------------------------------------------------
printf("GPIOH_DIR=%08X\n", GPIOH_DIR);
printf("GPIOH_OUT=%08X\n", GPIOH_OUT);
GPIOH_DIR = GPIOH_DIR | 0x02; // use pin->irq1
while(1)
{
GPIOH_OUT = GPIOH_OUT & 0xfffffffd; // pin->low
GPIOH_OUT = GPIOH_OUT | 0x02; // pin->high
}
// -----------------------------------------------------------------------
printf("Nice work. Bye!\n");
close(fd);
return 0;
}

CC=gcc
LD=ld

export CC
export LD

EXEC = gpio
OBJECTS = gpio.o

gpio: gpio.c
$(CC) gpio.c -o gpio

Clocks: CPU 400 MHz, master 133 MHz, main 12.000 MHz

#include <stdlib.h>
#include <malloc.h>

#include <stdio.h>
#include <termio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <string.h>

void *mapped_base;

#define GPIO_BA 0xFFFFF600 // GPIO C

#define MAP_BASE (GPIO_BA)
#define MAP_SIZE 4096Ul
#define MAP_MASK (MAP_SIZE - 1)

#define GPIO_EN_GPIO *(int*)(mapped_base+0x00)
#define GPIO_DIS_GPIO *(int*)(mapped_base+0x04)
#define GPIO_STAT_GPIO *(int*)(mapped_base+0x08)
#define GPIO_EN_OUT *(int*)(mapped_base+0x10)
#define GPIO_DIS_OUT *(int*)(mapped_base+0x14)
#define GPIO_SET_OUT *(int*)(mapped_base+0x30)
#define GPIO_CLR_OUT *(int*)(mapped_base+0x34)

int main(void)
{
int fd;
printf("\nResearch of gpio frequency (9G45, 400MHz) by Jury093 v0.01\n");
printf("Use Pin A4->PC20\n");
//-------------------------------------------------
// mapping GPIO Register
if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1)
{
printf("Cannot open /dev/mem.\n");
exit(EXIT_FAILURE);
}
printf("/dev/mem opened.\n");
mapped_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, MAP_BASE & ~MAP_MASK);
if (mapped_base == (void *) -1)
{
printf("Memory mapping error.\n");
exit(EXIT_FAILURE);
}
mapped_base+=(MAP_BASE & MAP_MASK);
printf("Target address mapped 0x%08x-->0x%08x\n",(int) MAP_BASE,(int)mapped_base);
// -------------------------------------------------------------
printf("GPIO_STAT_GPIO=%08X\n", GPIO_STAT_GPIO);
GPIO_EN_OUT = GPIO_EN_OUT | 0x00100000; // set pin fuction is output
while(1)
{
GPIO_SET_OUT = GPIO_SET_OUT | 0x00100000; // pin high
GPIO_CLR_OUT = GPIO_CLR_OUT | 0x00100000; // pin low
}
// -----------------------------------------------------------------------
printf("Nice work. Bye!\n");
close(fd);
return 0;
}

while(1)
{
GPIO_SET_OUT = 0x00100000; // pin high
GPIO_CLR_OUT = 0x00100000; // pin low
}