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traffic_light.c
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traffic_light.c
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// GPIO demo based on the
//
// Gertboard test suite
//
// These program walks the LEDs
//
//
// This file is part of gertboard test suite.
//
//
// Copyright (C) Gert Jan van Loo & Myra VanInwegen 2012
// No rights reserved
// You may treat this program as if it was in the public domain
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//
// Try to strike a balance between keep code simple for
// novice programmers but still have reasonable quality code
//
#include "gb_common.h"
// North side yellow has changed to pin 27 for new Rev 2 board.
// 6-12-12 www.skpang.co.uk
// I/O access
volatile unsigned *gpio;
#define RED_NORTH (1<<17) //North set of traffic light
#define YEL_NORTH (1<<27)
#define GRN_NORTH (1<<22)
#define RED_EAST (1<<25) //East set of traffic light
#define YEL_EAST (1<<8)
#define GRN_EAST (1<<7)
#define ALL_LEDS (RED_NORTH|YEL_NORTH|GRN_NORTH|RED_EAST|YEL_EAST|GRN_EAST)
// LEDs test GPIO mapping:
// Function Mode
// GPIO0= unused
// GPIO1= unused
// GPIO4= unused
// GPIO7= LED Output
// GPIO8= LED Output
// GPIO9= LED Output
// GPIO10= LED Output
// GPIO11= LED Output
// GPIO14= unused (preset to be UART)
// GPIO15= unused (preset to be UART)
// GPIO17= LED Output
// GPIO18= LED Output
// GPIO21= LED Output
// GPIO22= LED Output
// GPIO23= LED Output
// GPIO24= LED Output
// GPIO25= LED Output
void setup_gpio(void)
{
INP_GPIO(7); OUT_GPIO(7);
INP_GPIO(8); OUT_GPIO(8);
INP_GPIO(9); OUT_GPIO(9);
INP_GPIO(10); OUT_GPIO(10);
INP_GPIO(11); OUT_GPIO(11);
// 14 and 15 are already set to UART mode
// by Linux. Best if we don't touch them
INP_GPIO(17); OUT_GPIO(17);
INP_GPIO(18); OUT_GPIO(18);
INP_GPIO(21); OUT_GPIO(21);
INP_GPIO(22); OUT_GPIO(22);
INP_GPIO(23); OUT_GPIO(23);
INP_GPIO(24); OUT_GPIO(24);
INP_GPIO(25); OUT_GPIO(25);
} // setup_gpio
int main(void)
{
printf ("Traffic light demo\n");
// Map the I/O sections
setup_io();
// Set 12 GPIO pins to output mode
setup_gpio();
GPIO_CLR0 = ALL_LEDS; //Turn all LEDs off
int i = 1;
while(i < 4) //Loop forever
{
printf("Traffic lights loop %d\n", i);
GPIO_SET0 = RED_NORTH | GRN_EAST; // Turn on North red. Turn on East green
long_wait(80); // Wait a bit
GPIO_CLR0 = ALL_LEDS; // Turn led off
GPIO_SET0 = RED_NORTH | YEL_EAST; // Turn on North red. Turn on East yellow
long_wait(20); // Wait a short bit
GPIO_CLR0 = ALL_LEDS; // Turn led off
GPIO_SET0 = RED_NORTH | RED_EAST;
long_wait(20);
GPIO_CLR0 = ALL_LEDS;
GPIO_SET0 = YEL_NORTH | RED_EAST;
long_wait(20);
GPIO_CLR0 = ALL_LEDS;
GPIO_SET0 = GRN_NORTH | RED_EAST;
long_wait(80);
GPIO_CLR0 = ALL_LEDS;
GPIO_SET0 = YEL_NORTH | RED_EAST;
long_wait(20);
GPIO_CLR0 = ALL_LEDS;
GPIO_SET0 = RED_NORTH | RED_EAST;
long_wait(20);
GPIO_CLR0 = ALL_LEDS;
GPIO_SET0 = RED_NORTH | YEL_EAST;
long_wait(20);
GPIO_CLR0 = ALL_LEDS;
i++;
}
GPIO_CLR0 = ALL_LEDS; //Turn all LEDs off
restore_io();
} // main