pikeyd165 – Blame information for rev 1
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | office | 1 | // input.c |
| 2 | // |
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| 3 | // Example program for bcm2835 library |
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| 4 | // Reads and prints the state of an input pin |
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| 5 | // |
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| 6 | // After installing bcm2835, you can build this |
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| 7 | // with something like: |
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| 8 | // gcc -o input input.c -l bcm2835 |
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| 9 | // sudo ./input |
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| 10 | // |
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| 11 | // Or you can test it before installing with: |
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| 12 | // gcc -o input -I ../../src ../../src/bcm2835.c input.c |
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| 13 | // sudo ./input |
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| 14 | // |
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| 15 | // Author: Mike McCauley |
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| 16 | // Copyright (C) 2011 Mike McCauley |
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| 17 | // $Id: RF22.h,v 1.21 2012/05/30 01:51:25 mikem Exp $ |
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| 18 | |||
| 19 | #include <bcm2835.h> |
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| 20 | #include <stdio.h> |
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| 21 | |||
| 22 | // Input on RPi pin GPIO 15 |
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| 23 | #define PIN RPI_GPIO_P1_15 |
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| 24 | |||
| 25 | int main(int argc, char **argv) |
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| 26 | { |
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| 27 | // If you call this, it will not actually access the GPIO |
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| 28 | // Use for testing |
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| 29 | // bcm2835_set_debug(1); |
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| 30 | |||
| 31 | if (!bcm2835_init()) |
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| 32 | return 1; |
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| 33 | |||
| 34 | // Set RPI pin P1-15 to be an input |
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| 35 | bcm2835_gpio_fsel(PIN, BCM2835_GPIO_FSEL_INPT); |
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| 36 | // with a pullup |
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| 37 | bcm2835_gpio_set_pud(PIN, BCM2835_GPIO_PUD_UP); |
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| 38 | |||
| 39 | // Blink |
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| 40 | while (1) |
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| 41 | { |
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| 42 | // Read some data |
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| 43 | uint8_t value = bcm2835_gpio_lev(PIN); |
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| 44 | printf("read from pin 15: %d\n", value); |
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| 45 | |||
| 46 | // wait a bit |
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| 47 | delay(500); |
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| 48 | } |
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| 49 | |||
| 50 | bcm2835_close(); |
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| 51 | return 0; |
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| 52 | } |
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| 53 |