40 lines
674 B
C++
40 lines
674 B
C++
/*
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* JZ47xx GPIO lines
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*
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* Written 2010 by Andres Calderon andres.calderon@emqbit.com
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*/
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#include <stdio.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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#include <jz47xx_mmap.h>
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unsigned int *
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jz_mmap (off_t address)
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{
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int fd;
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unsigned int *pio;
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if ((fd = open ("/dev/mem", O_RDWR | O_SYNC)) == -1)
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{
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fprintf (stderr, "Cannot open /dev/mem.\n");
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return 0;
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}
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pio = (unsigned int *) mmap (0, getpagesize (), PROT_READ | PROT_WRITE, MAP_SHARED, fd, address);
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if (pio == (unsigned int *) -1)
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{
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fprintf (stderr, "Cannot mmap.\n");
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return 0;
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}
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return pio;
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}
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