105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
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#include <parapin.h>
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#include <stdlib.h> /* atoi() */
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#include <unistd.h> /* usleep() */
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#include <signal.h>
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#define LED_A LP_PIN02
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#define LED_B LP_PIN03
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#define LED_C LP_PIN04
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#define LED_D LP_PIN05
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#define LED_E LP_PIN06
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#define LED_F LP_PIN07
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#define LED_G LP_PIN08
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#define LED_DP LP_PIN09
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#define LED_1 LP_PIN17
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#define LED_2 LP_PIN16
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#define LED_3 LP_PIN14
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#define LED_POSITION_MASK (LED_1 | LED_2 | LED_3)
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#define LED_ALL (LED_A | LED_B | LED_C | LED_D | LED_E | LED_F | LED_G | LED_DP | LED_1 | LED_2 | LED_3)
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#define DELAY 250 /* microsecond delay between displaying digits */
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int digit2pins[] = {
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LED_A | LED_B | LED_C | LED_D | LED_E | LED_F,
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LED_B | LED_C,
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LED_A | LED_B | LED_G | LED_E | LED_D,
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LED_A | LED_B | LED_G | LED_C | LED_D,
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LED_F | LED_G | LED_B | LED_C,
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LED_A | LED_F | LED_G | LED_C | LED_D,
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LED_A | LED_F | LED_G | LED_E | LED_C | LED_D,
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LED_A | LED_B | LED_C,
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LED_A | LED_B | LED_C | LED_D | LED_E | LED_F | LED_G,
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LED_A | LED_B | LED_C | LED_D | LED_F | LED_G
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};
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int position2pins[] = {
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LED_1,
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LED_2,
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LED_3
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};
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void turnOnDigit(int digitPosition, int value);
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void shutDown(int p);
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int main(int argc, char * argv[])
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{
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/* initialize the parapin user-land library */
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pin_init_user(LPT1);
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/* set up pins as output pins */
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pin_output_mode(LED_ALL);
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if (argc == 2)
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{
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/* get the value to display from the command-line */
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int value = atoi(argv[1]);
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/* register an interrupt signal handler to clear the pins */
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signal(SIGINT, shutDown);
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int digits[3];
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register int i;
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for (i = 0; i < 3; i++)
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{
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digits[2-i] = value % 10;
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value /= 10;
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}
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/* loop displaying digits */
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i = 0;
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for (;;)
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{
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turnOnDigit(i, digits[i]);
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usleep(DELAY);
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i++;
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if (i == 3)
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i = 0;
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}
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}
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else
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{
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clear_pin(LED_ALL);
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}
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}
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void turnOnDigit(int digitPosition, int value)
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{
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/* turn all pins off */
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clear_pin(LED_ALL);
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/* enable the positional pin */
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register int pinSet = LED_POSITION_MASK & ~position2pins[digitPosition];
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pinSet |= digit2pins[value];
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set_pin(pinSet);
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}
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void shutDown(int p)
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{
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clear_pin(LED_ALL);
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exit(0);
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}
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