151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
//=============================================================================
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//
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//
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// Buttons_test
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//
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// main file
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//
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// This file is part of the gertboard test suite
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//
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//
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// Copyright (C) Gert Jan van Loo & Myra VanInwegen 2012
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// No rights reserved
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// You may treat this program as if it was in the public domain
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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#include "gb_common.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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//
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// Set GPIO pins to the right mode
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// button test GPIO mapping:
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// Function Mode
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// GPIO0= unused
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// GPIO1= unused
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// GPIO4= unused
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// GPIO7= unused
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// GPIO8= unused
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// GPIO9= unused
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// GPIO10= unused
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// GPIO11= unused
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// GPIO14= unused
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// GPIO15= unused
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// GPIO17= unused
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// GPIO18= unused
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// GPIO21= unused
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// GPIO22= unused
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// GPIO23= Pushbutton (B3) Input
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// GPIO24= Pushbutton (B2) Input
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// GPIO25= Pushbutton (B1) Input
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//
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// Always call INP_GPIO(x) first
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// as that is how the macros work
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void setup_gpio()
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{
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// for this test we are only using GP23, 24, & 25
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INP_GPIO(23);
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INP_GPIO(24);
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INP_GPIO(25);
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// enable pull-up on GPIO 23,24&25, set pull to 2 (code for pull high)
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GPIO_PULL = 2;
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short_wait();
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// setting bits 23, 24 & 25 below means that the GPIO_PULL is applied to
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// GPIO 23, 24, & 25
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GPIO_PULLCLK0 = 0x03800000;
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short_wait();
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GPIO_PULL = 0;
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GPIO_PULLCLK0 = 0;
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} // setup_gpio
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// remove pulling on pins so they can be used for somnething else next time
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// gertboard is used
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void unpull_pins()
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{
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// disable pull-up on GPIO 23,24&25, set pull to 0 (code for no pull)
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GPIO_PULL = 0;
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short_wait();
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// setting bits 23, 24 & 25 below means that the GPIO_PULL is applied to
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// GPIO 23, 24, & 25
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GPIO_PULLCLK0 = 0x03800000;
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short_wait();
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GPIO_PULL = 0;
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GPIO_PULLCLK0 = 0;
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} // unpull_pins
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int main(void)
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{ int r,d;
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unsigned int b,prev_b;
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char str [4];
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printf ("These are the connections for the buttons test:\n");
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printf ("GP25 in J2 --- B1 in J3\n");
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printf ("GP24 in J2 --- B2 in J3\n");
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printf ("GP23 in J2 --- B3 in J3\n");
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printf ("Optionally, if you want the LEDs to reflect button state do the following:\n");
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printf ("jumper on U3-out-B1\n");
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printf ("jumper on U3-out-B2\n");
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printf ("jumper on U3-out-B3\n");
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printf ("When ready hit enter.\n");
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(void) getchar();
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// Map the I/O sections
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setup_io();
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// Set GPIO pins 23, 24, and 25 to the required mode
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setup_gpio();
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// read the switches a number of times and print out the result
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/* below we set prev_b to a number which will definitely be different
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from what the switches returns, as after shift & mask, b can only
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be in range 0..7 */
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prev_b = 8;
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r = 20; // number of repeats
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while (r)
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{
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b = GPIO_IN0;
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b = (b >> 23 ) & 0x07; // keep only bits 23, 24 & 25
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if (b^prev_b)
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{ // one or more buttons changed
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make_binary_string(3, b, str);
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printf("%s\n", str);
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prev_b = b;
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r--;
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} // change
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} // while
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// disable pull up on pins & unmap gpio
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unpull_pins();
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restore_io();
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return 0;
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} // main
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