kopia lustrzana https://github.com/Hamlib/Hamlib
50 wiersze
1.5 KiB
C
50 wiersze
1.5 KiB
C
// filename button.c
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// connect a button to DIO pin 1 and ground
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// blinks green and red led on the ts-7200 when button is pressed
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//
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// compile arm-linux-gcc -o button button.c
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//
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#include<unistd.h>
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#include<sys/types.h>
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#include<sys/mman.h>
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#include<stdio.h>
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#include<fcntl.h>
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#include<string.h>
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int main(int argc, char **argv)
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{
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volatile unsigned int *PEDR, *PEDDR, *PBDR, *PBDDR, *GPIOBDB;
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int i;
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unsigned char state;
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unsigned char *start;
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int fd = open("/dev/mem", O_RDWR|O_SYNC);
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start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x80840000);
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PBDR = (unsigned int *)(start + 0x04); // port b
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PBDDR = (unsigned int *)(start + 0x14); // port b direction register
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PEDR = (unsigned int *)(start + 0x20); // port e data
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PEDDR = (unsigned int *)(start + 0x24); // port e direction register
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GPIOBDB = (unsigned int *)(start + 0xC4); // debounce on port b
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*PBDDR = 0xf0; // upper nibble output, lower nibble input
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*PEDDR = 0xff; // all output (just 2 bits)
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*GPIOBDB = 0x01; // enable debounce on bit 0
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state = *PBDR; // read initial state
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while (state & 0x01) { // wait until button goes low
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state = *PBDR; // remember bit 0 is pulled up with 4.7k ohm
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}
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// blink 5 times, sleep 1 second so it's visible
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for (i = 0; i < 5; i++) {
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*PEDR = 0xff;
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sleep(1);
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*PEDR = 0x00;
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sleep(1);
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}
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close(fd);
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return 0;
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}
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