132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/*
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* Interface to LED cube 8x8x8.
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* The cube is connected to pins D0-D9 of Duinomite board.
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*
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* Pin PIC32 Function
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* ---------------
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* D0 RE0 Y0 \
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* D1 RE1 Y1 | Layer select
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* D2 RE2 Y2 /
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* D3 RE3 Y3 - Upper backlignt
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* D4 RE4 Y4 - Lower backlight
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* D5 RE5 SDI - Serial data \
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* D6 RE6 CLK - Clock | to shift registers
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* D7 RE7 /LE - Latch enable |
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* D8 RB11 /OE - Output enable /
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* D10 RD11 EXT - Unknown
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/gpio.h>
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#include "cube.h"
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static int gpio;
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void gpio_init()
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{
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char *devname = "/dev/porta";
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/* Open GPIO driver. */
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gpio = open(devname, 1);
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if (gpio < 0) {
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perror(devname);
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exit(-1);
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}
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/* Configure pins RE0-RE7, RB11 and RD11 as output. */
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ioctl(gpio, GPIO_PORTE | GPIO_CONFOUT, 0xff);
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 0xff);
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ioctl(gpio, GPIO_PORTB | GPIO_CONFOUT, 1 << 11);
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ioctl(gpio, GPIO_PORTB | GPIO_CLEAR, 1 << 11);
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ioctl(gpio, GPIO_PORTD | GPIO_CONFOUT, 1 << 11);
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ioctl(gpio, GPIO_PORTD | GPIO_CLEAR, 1 << 11);
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}
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void gpio_ext(int on)
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{
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/* EXT signal at RD11. */
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if (on)
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ioctl(gpio, GPIO_PORTD | GPIO_SET, 1 << 11);
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else
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ioctl(gpio, GPIO_PORTD | GPIO_CLEAR, 1 << 11);
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}
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void gpio_oe(int active)
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{
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/* /OE signal at RB11, active low. */
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if (active)
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ioctl(gpio, GPIO_PORTB | GPIO_CLEAR, 1 << 11);
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else
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ioctl(gpio, GPIO_PORTB | GPIO_SET, 1 << 11);
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}
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void gpio_le(int active)
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{
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/* /LE signal at RE7, active low. */
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if (active)
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 7);
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else
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 7);
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}
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void gpio_backlight_upper(int on)
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{
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/* Y4 signal at RE4. */
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if (on)
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 4);
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else
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 4);
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}
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void gpio_backlight_lower(int on)
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{
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/* Y3 signal at RE3. */
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if (on)
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 3);
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else
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 3);
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}
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void gpio_layer(int z)
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{
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/* Y0-Y2 signals at RE0-RE23. */
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if (z & 1)
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 0);
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else
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 0);
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if (z & 2)
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 1);
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else
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 1);
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if (z & 4)
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 2);
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else
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 2);
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}
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void gpio_plane(unsigned char *data)
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{
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int i, n, val;
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/* Send 8 bytes of tada to shift registers. */
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for (i=0; i<8; i++) {
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val = *data++;
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for (n=0; n<8; n++) {
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/* SDI signal at RE5. */
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if (val & 0x80)
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 5);
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else
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 5);
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/* CLK signal at RE6. */
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ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 6);
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ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 6);
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val <<= 1;
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}
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}
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}
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