Added example for 6-digit LCD display.

rootfs.manifest

@@ -736,6 +736,7 @@ file /share/examples/c/Makefile
 file /share/examples/c/adc.c
 file /share/examples/c/gpio.c
 file /share/examples/c/hello.c
+file /share/examples/c/lcd6.c
 file /share/examples/c/primelist.c
 file /share/examples/c/primesum.c
 file /share/examples/c/q8.c

share/examples/c/Makefile

@@ -1,6 +1,6 @@
 CC      = cc
 PROG    = hello stdarg skeleton primelist primesum test1 test2 test3 \
-          gpio adc rain q8 tetris
+          gpio adc rain q8 tetris lcd6
 
 all:    $(PROG)
 
@@ -34,6 +34,9 @@ q8:     q8.c
 tetris: tetris.c
 	$(CC) $(CFLAGS) -o $@ $(LDFLAGS) $?
 
+lcd6:   lcd6.c
+	$(CC) $(CFLAGS) -o $@ $(LDFLAGS) $?
+
 test1:	test1.c
 	$(CC) $(CFLAGS) -o $@ $(LDFLAGS) $?
 

share/examples/c/Makefile-host

@@ -1,9 +1,9 @@
 TOPSRC		= $(shell cd ../../..; pwd)
 include $(TOPSRC)/target.mk
 
-CFLAGS		+= -Werror
+CFLAGS		+= -Werror -Wall
 
-all:            chello stdarg
+all:            chello stdarg lcd6
 
 chello:         chello.o
 		${CC} ${LDFLAGS} -o chello.elf chello.o ${LIBS}
@@ -17,5 +17,11 @@ tetris:         tetris.o
 		${SIZE} tetris.elf
 		${ELF2AOUT} tetris.elf $@
 
+lcd6:           lcd6.o
+		${CC} ${LDFLAGS} -o lcd6.elf lcd6.o ${LIBS}
+		${OBJDUMP} -S lcd6.elf > lcd6.dis
+		${SIZE} lcd6.elf
+		${ELF2AOUT} lcd6.elf $@
+
 clean:
-		rm -f *.o *.elf ${MAN} chello stdarg *.elf *.dis tags *~
+		rm -f *.o *.elf ${MAN} chello stdarg lcd6 *.elf *.dis tags *~

share/examples/c/lcd6.c

@@ -0,0 +1,304 @@
+/*
+ * Demo for 6 digit LCD module based on HT1261 controller.
+ * Based on example sources from http://www.canton-electronics.com
+ *
+ * Copyright (C) 2015 Serge Vakulenko
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * and its documentation for any purpose and without fee is hereby
+ * granted, provided that the above copyright notice appear in all
+ * copies and that both that the copyright notice and this
+ * permission notice and warranty disclaimer appear in supporting
+ * documentation, and that the name of the author not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ *
+ * The author disclaim all warranties with regard to this
+ * software, including all implied warranties of merchantability
+ * and fitness.  In no event shall the author be liable for any
+ * special, indirect or consequential damages or any damages
+ * whatsoever resulting from loss of use, data or profits, whether
+ * in an action of contract, negligence or other tortious action,
+ * arising out of or in connection with the use or performance of
+ * this software.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include <sys/gpio.h>
+
+/*
+ * Digits, decimal dots and battery levels:
+ *   A     B     C     D     E     F
+ *   --    --    --    --    --    --  z
+ *  |  |  |  |  |  |  |  |  |  |  |  | y
+ *   --    --    --    --    --    --  x
+ *  |  |  |  |  |  |  |  |  |  |  |  |
+ *   --    --    -- c  -- d  -- e  --
+ *
+ * Memory map:
+ *  Byte 0, bits 0-6    - segments of digit 'F'
+ *  Byte 0, bit 7       - decimal dot 'e'
+ *  Byte 1, bits 0-6    - segments of digit 'E'
+ *  Byte 1, bit 7       - decimal dot 'd'
+ *  Byte 2, bits 0-6    - segments of digit 'D'
+ *  Byte 2, bit 7       - decimal dot 'c'
+ *  Byte 3, bits 0-6    - segments of digit 'C'
+ *  Byte 3, bit 7       - battery level 'x'
+ *  Byte 4, bits 0-6    - segments of digit 'B'
+ *  Byte 4, bit 7       - battery level 'y'
+ *  Byte 5, bits 0-6    - segments of digit 'A'
+ *  Byte 5, bit 7       - battery level 'z'
+ *
+ * Segments are mapped to bits 0-6:
+ *  --4--
+ *  0---5
+ *  --1--
+ *  2---6
+ *  --3--
+ */
+
+/*
+ * Signal assignment.
+ * LED modulee is connected to pins 16,17,18 of Fubarino SD board.
+ *
+ * Pin  PIC32  LED module
+ * ---------------
+ *  16  RE0    CS
+ *  17  RE1    WR
+ *  18  RE2    DATA
+ */
+#define gpio_cs_clear()         ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 0)
+#define gpio_cs_set()           ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 0)
+#define gpio_wr_clear()         ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 1)
+#define gpio_wr_set()           ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 1)
+#define gpio_data_clear()       ioctl(gpio, GPIO_PORTE | GPIO_CLEAR, 1 << 2)
+#define gpio_data_set()         ioctl(gpio, GPIO_PORTE | GPIO_SET, 1 << 2)
+
+/*
+ * HT1621 commands
+ */
+#define HT_SYS_DIS	0x00    /* Turn off system osc and bias generator */
+#define HT_SYS_EN	0x01    /* Turn on system oscillator */
+#define HT_LCD_OFF	0x02    /* Turn off LCD bias generator */
+#define HT_LCD_ON	0x03    /* Turn on LCD bias generator */
+#define HT_CLOCK_XTAL	0x14    /* Crystal 32kHz */
+#define HT_CLOCK_RC	0x18    /* On-chip RC oscillator 256kHz */
+#define HT_CLOCK_EXT	0x1c    /* External clock */
+#define HT_BIAS_1_3	0x21    /* LCD 1/3 bias option, 2 commons default */
+#define HT_COMMONS_3	0x04    /* 3 commons option */
+#define HT_COMMONS_4	0x08    /* 4 commons option */
+
+/*
+ * Mapping of symbols to segments.
+ *  0, 1, 2, 3, 4, 5, 6, 7,
+ *  8, 9, A, b, C, c, d, E,
+ *  F, H, h, L, n, N, o, P,
+ *  r, t, U, -,  ,
+ */
+const char char_to_segm[] = {
+    0x7D,   0x60,   0x3E,   0x7A,   0x63,   0x5B,   0x5F,   0x70,
+    0x7F,   0x7B,   0x77,   0x4F,   0x1D,   0x0E,   0x6E,   0x1F,
+    0x17,   0x67,   0x47,   0x0D,   0x46,   0x75,   0x37,   0x06,
+    0x0F,   0x6D,   0x02,   0x00,
+};
+
+int gpio;
+
+/*
+ * Spin for a few microseconds.
+ */
+void udelay(unsigned duration)
+{
+    struct timeval t0, now;
+    int usec;
+
+    gettimeofday(&t0, 0);
+    for (;;) {
+        gettimeofday(&now, 0);
+        usec = now.tv_usec - t0.tv_usec;
+        usec += (now.tv_sec - t0.tv_sec) * 1000000;
+        if (usec >= duration)
+            break;
+    }
+}
+
+/*
+ * Send a series of bits to HT1621.
+ * Up to 8 bits, high bit first.
+ * Max clock rate is 150kHz.
+ */
+void ht_send(int nbits, int data)
+{
+    data <<= (8 - nbits);
+    gpio_wr_clear();
+    while (nbits-- > 0) {
+        udelay(5);
+        if (data & 0x80)
+            gpio_data_set();
+        else
+            gpio_data_clear();
+        gpio_wr_set();
+        udelay(5);
+        gpio_wr_clear();
+        data <<= 1;
+    }
+}
+
+/*
+ * Send command to HT1621.
+ */
+void ht_cmd(int command)
+{
+    gpio_cs_clear();
+    ht_send(3, 0x4);        /* Mode "100" */
+    ht_send(8, command);
+    gpio_cs_set();
+}
+
+/*
+ * Send data and command.
+ */
+void ht_write(int addr, int data)
+{
+    gpio_cs_clear();
+    ht_send(3, 0x5);        /* Mode "101" */
+    ht_send(6, addr << 1);  /* Half-byte address 6 bits */
+    ht_send(8, data);       /* Data 8 bits */
+    gpio_cs_set();
+}
+
+/*
+ * Initialize LCD controller.
+ */
+void lcd_init()
+{
+    /* Open GPIO driver. */
+    gpio = open("/dev/porta", 1);
+    if (gpio < 0) {
+        perror("/dev/porta");
+        exit(-1);
+    }
+
+    /* Configure pins as outputs. */
+    ioctl(gpio, GPIO_PORTE | GPIO_CONFOUT, 0x07);
+    gpio_cs_set();
+    gpio_wr_clear();
+
+    /* Setup appropriate HT1621 mode. */
+    ht_cmd(HT_SYS_EN);
+    ht_cmd(HT_CLOCK_RC);
+    ht_cmd(HT_BIAS_1_3 | HT_COMMONS_4);
+    ht_cmd(HT_LCD_ON);
+}
+
+/*
+ * Set display memory to given value.
+ */
+void lcd_clear(int value)
+{
+    int i;
+
+    for (i=0; i<6; i++) {
+        ht_write(i, value);
+    }
+}
+
+/*
+ * LCD on/off.
+ */
+void lcd_enable(int on)
+{
+    if (on)
+        ht_cmd(HT_LCD_ON);
+    else
+        ht_cmd(HT_LCD_OFF);
+}
+
+/*
+ * Display data.
+ *  val - Data to be displayed, 0-999999
+ *  dot - Display decimal dot, 0-3
+ *  bat - Battery level, 0-7
+ */
+void lcd_display(unsigned val, int dot, int bat)
+{
+    int i, byte[6];
+
+    /* Set numeric value. */
+    byte[5] = char_to_segm[val / 100000];
+    byte[4] = char_to_segm[(val / 10000) % 10];
+    byte[3] = char_to_segm[(val / 1000) % 10];
+    byte[2] = char_to_segm[(val / 100) % 10];
+    byte[1] = char_to_segm[(val / 10) % 10];
+    byte[0] = char_to_segm[val % 10];
+
+    /* Enable decimal dot/ */
+    switch (dot) {
+    case 1:
+        byte[0] |= 1 << 7;
+        break;
+    case 2:
+        byte[1] |= 1 << 7;
+        break;
+    case 3:
+        byte[2] |= 1 << 7;
+        break;
+    default:
+        break;
+    }
+    if (bat & 1)
+        byte[3] |= 1 << 7;
+    if (bat & 2)
+        byte[4] |= 1 << 7;
+    if (bat & 3)
+        byte[5] |= 1 << 7;
+
+    for (i=0; i<6; i++) {
+        ht_write(i, byte[i]);
+    }
+}
+
+/*
+ * Suspend the process for some amount of milliseconds.
+ */
+void mdelay(unsigned msec)
+{
+    usleep(msec * 1000);
+}
+
+int main()
+{
+    int i;
+
+    /* Initialize hardware. */
+    lcd_init();
+
+    /* Blink all segments twice. */
+    lcd_clear(0xff);
+    mdelay(300);
+    lcd_clear(0);
+    mdelay(300);
+    lcd_clear(0xff);
+    mdelay(300);
+    lcd_clear(0);
+    mdelay(300);
+
+    /* Show all characters on all segments. */
+    for (i=0; i<sizeof(char_to_segm); i++) {
+        lcd_clear(char_to_segm[i]);
+        mdelay(200);
+    }
+    lcd_clear(0);
+
+    /* Display counter 0 to 999999. */
+    for (;;) {
+       for (i=0; i<999999; i++) {
+            lcd_display(i, 1, i/10);
+            mdelay(100);
+       }
+    }
+    return 0;
+}

share/examples/c/tetris.c

@@ -24,7 +24,10 @@
  * this software.
  */
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
 #include <sys/gpio.h>
 
 #define PITWIDTH    12

share/examples/cube/gpio.c

@@ -1,6 +1,6 @@
 /*
  * Interface to LED cube 8x8x8.
- * The cube is connected to D0-D9 pin of Duinomite board.
+ * The cube is connected to pins D0-D9 of Duinomite board.
  *
  * Pin  PIC32  Function
  * ---------------