====== SPI Dot-Matrix ======
{{http://dn.odroid.com/wiki_image/xu4_spi_dot_matrix.jpg?500|}}

To use spidev on your **ODROID-XU4** you should fix device tree source.


<WRAP center round important 100%>
To use the SPI, you first need to update the kernel version to "3.10.82" or higher.
  sudo apt-get update && sudo apt-get dist-upgrade
</WRAP>

=== How to enable driver (Only Ubuntu 16.04 or higher is required) ===
Edit /etc/modprobe.d/blacklist-odroid.conf to comment out following two ines.
<code>
blacklist spidev
blacklist spi_s3c64xx
</code>

Reboot.
  reboot
Check your SPI node.
  ls /dev/spidev*


==== Compile & run SPI test example source code ====

<code>
gcc -o dot_test dot_test.c
</code>

<code>
odroid@odroid:~$ sudo ./dot_test
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)
</code>

==== Simple Dot-matrix LED test ====
<file c dot_test.c>
/*
 * SPI testing utility (using spidev driver)
 *
 * Copyright (c) 2007  MontaVista Software, Inc.
 * Copyright (c) 2007  Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>

#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#define uchar unsigned char

#define MAX_RAW     36
#define MAX_COLUMN  8

uchar disp1[MAX_RAW][MAX_COLUMN] = {
    {0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//0
    {0x10,0x30,0x50,0x10,0x10,0x10,0x10,0x7C},//1
    {0x3E,0x02,0x02,0x3E,0x20,0x20,0x3E,0x00},//2
    {0x00,0x7C,0x04,0x04,0x7C,0x04,0x04,0x7C},//3
    {0x08,0x18,0x28,0x48,0xFE,0x08,0x08,0x08},//4
    {0x3C,0x20,0x20,0x3C,0x04,0x04,0x3C,0x00},//5
    {0x3C,0x20,0x20,0x3C,0x24,0x24,0x3C,0x00},//6
    {0x3E,0x22,0x04,0x08,0x08,0x08,0x08,0x08},//7
    {0x00,0x3E,0x22,0x22,0x3E,0x22,0x22,0x3E},//8
    {0x3E,0x22,0x22,0x3E,0x02,0x02,0x02,0x3E},//9
    {0x08,0x14,0x22,0x3E,0x22,0x22,0x22,0x22},//A
    {0x3C,0x22,0x22,0x3E,0x22,0x22,0x3C,0x00},//B
    {0x3C,0x40,0x40,0x40,0x40,0x40,0x3C,0x00},//C
    {0x7C,0x42,0x42,0x42,0x42,0x42,0x7C,0x00},//D
    {0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x7C},//E
    {0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x40},//F
    {0x3C,0x40,0x40,0x40,0x40,0x44,0x44,0x3C},//G
    {0x44,0x44,0x44,0x7C,0x44,0x44,0x44,0x44},//H
    {0x7C,0x10,0x10,0x10,0x10,0x10,0x10,0x7C},//I
    {0x3C,0x08,0x08,0x08,0x08,0x08,0x48,0x30},//J
    {0x00,0x24,0x28,0x30,0x20,0x30,0x28,0x24},//K
    {0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x7C},//L
    {0x81,0xC3,0xA5,0x99,0x81,0x81,0x81,0x81},//M
    {0x00,0x42,0x62,0x52,0x4A,0x46,0x42,0x00},//N
    {0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//O
    {0x3C,0x22,0x22,0x22,0x3C,0x20,0x20,0x20},//P
    {0x1C,0x22,0x22,0x22,0x22,0x26,0x22,0x1D},//Q
    {0x3C,0x22,0x22,0x22,0x3C,0x24,0x22,0x21},//R
    {0x00,0x1E,0x20,0x20,0x3E,0x02,0x02,0x3C},//S
    {0x00,0x3E,0x08,0x08,0x08,0x08,0x08,0x08},//T
    {0x42,0x42,0x42,0x42,0x42,0x42,0x22,0x1C},//U
    {0x42,0x42,0x42,0x42,0x42,0x42,0x24,0x18},//V
    {0x00,0x49,0x49,0x49,0x49,0x2A,0x1C,0x00},//W
    {0x00,0x41,0x22,0x14,0x08,0x14,0x22,0x41},//X
    {0x41,0x22,0x14,0x08,0x08,0x08,0x08,0x08},//Y
    {0x00,0x7F,0x02,0x04,0x08,0x10,0x20,0x7F},//Z
};

static void pabort(const char *s) {
    perror(s);
    abort();
}

static const char *device_spidev0_0 = "/dev/spidev0.0";
static const char *device_spidev1_0 = "/dev/spidev1.0";
static uint8_t mode;
static uint8_t bits = 8;
static uint32_t speed = 500000;

static void transfer(int fd, uchar address1, uchar dat1, uchar address2, uchar dat2) {
    int ret;
    uint8_t tx[] = {
        address1, dat1, address2, dat2
    };
    uint8_t rx[ARRAY_SIZE(tx)] = {0, };

    struct spi_ioc_transfer tr;

    memset((void *)&tr, 0x00, sizeof(tr));
    
    tr.tx_buf = (unsigned long)tx;
    tr.rx_buf = (unsigned long)rx;
    tr.len = ARRAY_SIZE(tx);
    tr.speed_hz = speed;
    tr.bits_per_word = bits;
    tr.delay_usecs = 0;
    tr.cs_change = 0;

    ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
    if (ret < 1)
        pabort("can't send SPI message");
}

int main() {
    uchar i , j;
    int ret = 0;
    int fd;

    fd = open(device_spidev0_0, O_RDWR);
    if (fd < 0) {
        printf("can't open /dev/spidev0.0\nTry /dev/spidev1.0\n");
        fd = open(device_spidev1_0, O_RDWR);
        if (fd < 0)
            pabort("can't open /dev/spidev1.0");
    }

    /* SPI mode */
    ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);
    if (ret == -1)
        pabort("can't set SPI mode");

    ret = ioctl(fd, SPI_IOC_RD_MODE, &mode);
    if (ret == -1)
        pabort("can't get SPI mode");

    /* bits per word */
    ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
    if (ret == -1)
        pabort("can't set bits per word");

    ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
    if (ret == -1)
        pabort("can't get bits per word");

    /* max speed hz */
    ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
    if (ret == -1)
        pabort("can't set max speed Hz");

    ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
    if (ret == -1)
        pabort("can't get max speed Hz");

    printf("SPI mode: %d\n", mode);
    printf("bits per word: %d\n", bits);
    printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);

    transfer(fd, 0x09,0x00,0x09,0x00);
    transfer(fd, 0x0a,0x03,0x0a,0x03);
    transfer(fd, 0x0b,0x07,0x0b,0x07);
    transfer(fd, 0x0c,0x01,0x0c,0x01);
    transfer(fd, 0x0f,0x00,0x0f,0x00);

    while (1) {
        for(j = 0; j < MAX_RAW - 1; j++) {
            for(i = 1; i < MAX_COLUMN + 1; i++)
                transfer(fd, i, disp1[j + 1][i - 1], i, disp1[j][i - 1]);
            usleep(1000000);
        }
    }

    close(fd);

    return ret;
}
</file>

==== Example of Scrolling Text ====

<WRAP round important 100%>
<color #00a2e8>**WiringPi SPI API**</color> use case :

Uncomment this line first.
#define USE_WIRING_PI_LIB

Build the example with proper library option.
if defined USE_WIRING_PI_LIB
      Compile : gcc -o <create excute file name> <source file name> -lwiringPi -lwiringPiDev -lpthread
else
      Compile : gcc -o <create excute file name> <source file name>
</WRAP>


<code>
gcc -o dot_test dot_shift_test.c
</code>

<code>
odroid@odroid:~$ sudo ./dot_shift_test
max speed: 1000000 Hz (1000 KHz)
</code>

<file c dot_shift_test.c>
//------------------------------------------------------------------------------
//
// Dot-Matrix LED Test Application.(ODROIDs SPIDEV)
//
// if defined USE_WIRING_PI_LIB
//      Compile : gcc -o <create excute file name> <source file name> -lwiringPi -lwiringPiDev -lpthread
// else
//      Compile : gcc -o <create excute file name> <source file name>
//
// Run : sudo ./<created excute file name>
//
//------------------------------------------------------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
 
#include <unistd.h>
#include <string.h>
#include <time.h>

#include <ifaddrs.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>

// wiringPi Library use flag (if disable then normal spidev control)
//#define USE_WIRING_PI_LIB

// Display Item flag (if disable then Data & Time Display)
#define DISPLAY_IP_ADDR

#define START_STR               "Hello! Odroid!"

#define SPI_MAX_SPEED           1000000     // 1Mhz SPI Speed

//------------------------------------------------------------------------------
//
// Application use value define
//
//------------------------------------------------------------------------------
#include "dotfont.h"

#define SHIFT_DELAY_MS          70
#define DISPLAY_DELAY_MS        1000
#define MAX_SHIFT_CHAR_COUNT    256
#define DOT_MATRIX_8X8_COUNT    MAX_SHIFT_CHAR_COUNT

//
// Virtual Dotmatrix framebuffer define.
//
unsigned char   DotMatrixFb[DOT_MATRIX_8X8_COUNT][8] = { 0 };

//------------------------------------------------------------------------------
//
// wiringPi use header file
//
//------------------------------------------------------------------------------
#if defined(USE_WIRING_PI_LIB)
    #include <wiringPi.h>
    #include <wiringPiSPI.h>
#else
    //#define SPIDEV_NODE_NAME    "/dev/spidev0.0"    // ODROID-C1/C1+
    #define SPIDEV_NODE_NAME    "/dev/spidev1.0"    // ODROID-XU3/XU4
    int SpidevFd = -1;
#endif

//------------------------------------------------------------------------------
//
// SPI Dot Matrix Initialize data
//
//------------------------------------------------------------------------------
unsigned char dotled_init[5][4] = {
    {0x09,0x00,0x09,0x00},
    {0x0a,0x03,0x0a,0x03},
    {0x0b,0x07,0x0b,0x07},
    {0x0c,0x01,0x0c,0x01},
    {0x0f,0x00,0x0f,0x00},
};   

//------------------------------------------------------------------------------
//
// Get ethernet ip addr
//
//------------------------------------------------------------------------------
int get_ethernet_ip (unsigned char *buf)
{
    struct  ifaddrs *ifa;
    int     str_cnt;

    getifaddrs(&ifa);
    
    while(ifa)  {
        if(ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET)    {
            struct sockaddr_in *pAddr = (struct sockaddr_in *)ifa->ifa_addr;
            
            if(0==strncmp(ifa->ifa_name, "eth", 2)) {
//                str_cnt = sprintf(buf, "IP(%s):%s", ifa->ifa_name, inet_ntoa(pAddr->sin_addr));
                str_cnt = sprintf(buf, "IP:%s", inet_ntoa(pAddr->sin_addr));
            }
        }
        ifa = ifa->ifa_next;
    }
    freeifaddrs(ifa);
    
    return  str_cnt;
}

//------------------------------------------------------------------------------
//
// Get date & time
//
//------------------------------------------------------------------------------
int get_date_time   (unsigned char *buf)
{
    time_t      tm_time;
    struct tm   *st_time;
    int         str_cnt;

    time(&tm_time);     

    st_time = localtime(&tm_time);

    return  (strftime(buf, MAX_SHIFT_CHAR_COUNT , "%Y/%m/%d %a %H:%M:%S %p", st_time));
}

//------------------------------------------------------------------------------
//
// SPI Dot Matrix H/W Write
//
//------------------------------------------------------------------------------
#if !defined(USE_WIRING_PI_LIB)
void dotmatrix_write (unsigned char *buf, unsigned int len)
{
    struct spi_ioc_transfer tr;

    memset((void *)&tr, 0x00, sizeof(tr));

    tr.tx_buf           = (unsigned long)buf;
    tr.rx_buf           = (unsigned long)buf;
    tr.len              = len;
    tr.speed_hz         = SPI_MAX_SPEED;
    tr.bits_per_word    = 8;
    tr.delay_usecs      = 0;
    tr.cs_change        = 0;

    if (ioctl(SpidevFd, SPI_IOC_MESSAGE(1), &tr) < 1)
        fprintf (stderr, "%s: can't send SPI message", __func__);
}    
#endif
//------------------------------------------------------------------------------
//
// SPI Dot Matrix update
//
//------------------------------------------------------------------------------
void dotmatrix_update   (void)
{
    unsigned char spi_data[4] = { 0, }, i;
    
    for(i = 0; i < 8; i++)  {
        spi_data[0] = i +1; spi_data[1] = DotMatrixFb[1][i];
        spi_data[2] = i +1; spi_data[3] = DotMatrixFb[0][i];
#if defined(USE_WIRING_PI_LIB)
        wiringPiSPIDataRW(0, &spi_data[0], sizeof(spi_data));
#else
        dotmatrix_write(&spi_data[0], sizeof(spi_data));
#endif
    }
}

//------------------------------------------------------------------------------
//
// Dot Matrix Frambuffer Shift
//
//------------------------------------------------------------------------------
void dotmatrix_buffer_shift(int delay_ms)
{
    int     i, j;

    for(j = 0; j < DOT_MATRIX_8X8_COUNT; j++)   {
        for(i = 0; i < 8; i++)  {
            DotMatrixFb[j][i] <<= 1;
            if((j != DOT_MATRIX_8X8_COUNT -1) && (DotMatrixFb[j + 1][i] & 0x80))
                DotMatrixFb[j][i] |= 0x01;
        }
    }
    dotmatrix_update();
    
    usleep(delay_ms * 1000);
}

//------------------------------------------------------------------------------
//
// Dot Matrix Framebuffer Update
//
//------------------------------------------------------------------------------
int dotmatrix_buffer_update (unsigned char *str, int delay_ms)
{
    int     i, buf_pos = 0, bits_count = 0;
    
    while(*str != 0x00) {
        for(i = 0; i < 8; i++)  {
            DotMatrixFb[buf_pos][i] = VINCENT_FONT[*str][i];
            bits_count++;
        }
        buf_pos++;  str++;
    }

    dotmatrix_update();     

    usleep(delay_ms * 1000);

    return  (bits_count);    // String total bits
}

//------------------------------------------------------------------------------
//
// system init
//
//------------------------------------------------------------------------------
int system_init(void)
{
    int i, spi_speed = SPI_MAX_SPEED;

#if defined(USE_WIRING_PI_LIB)
    // spi channel open, speed = 1Mhz       
    if(wiringPiSPISetup(0, spi_speed) < 0)    
    {
        fprintf (stderr, "%s: wiringPiSPISetup failed\n", __func__);    return -1;
    }
 
    for(i = 0; i < 5; i++)  {
        wiringPiSPIDataRW(0, &dotled_init[i][0], 4);
    }

#else
    if ((SpidevFd = open(SPIDEV_NODE_NAME, O_RDWR)) < 0)  {
        fprintf (stderr, "%s : Hardware Init(%s) failed\n", __func__, SPIDEV_NODE_NAME);
        return  -1;
    }
    if(ioctl(SpidevFd, SPI_IOC_WR_MAX_SPEED_HZ, &spi_speed) < 0)    {
        fprintf (stderr, "%s : can't set max speed Hz", __func__);
        return  -1;
    }

    for(i = 0; i < 5; i++)  {
        dotmatrix_write(&dotled_init[i][0], 4);
    }
#endif    
 
    return  0;
}
 
//------------------------------------------------------------------------------
//
// Start Program
//
//------------------------------------------------------------------------------
int main (int argc, char *argv[])
{
    int             speed, shift_len;
    unsigned char   disp_str[MAX_SHIFT_CHAR_COUNT];
     
#if defined(USE_WIRING_PI_LIB)
    wiringPiSetup ();
#endif    
 
    if (system_init() < 0)
    {
        fprintf (stderr, "%s: System Init failed\n", __func__);     return -1;
    }

#if defined(USE_WIRING_PI_LIB)
    if (ioctl(wiringPiSPIGetFd(0), SPI_IOC_RD_MAX_SPEED_HZ, &speed) == -1)   {
        fprintf (stderr, "%s: Get Max Speed Error!\n", __func__);   return -1;
    }
#else
    if (ioctl(SpidevFd, SPI_IOC_RD_MAX_SPEED_HZ, &speed) == -1)   {
        fprintf (stderr, "%s: Get Max Speed Error!\n", __func__);   return -1;
    }
#endif

    printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);

    while(1)
    {
        // display buffer clear
        memset(disp_str, 0x00, sizeof(disp_str));

#if defined(START_STR)        
        shift_len  = sprintf(&disp_str[0], "%s ", START_STR);
#else
        shift_len = 0;
#endif
        
#if defined(DISPLAY_IP_ADDR)        
        get_ethernet_ip(&disp_str[shift_len]);
#else        
        get_date_time(&disp_str[shift_len]);
#endif

        shift_len = dotmatrix_buffer_update(disp_str, DISPLAY_DELAY_MS);

        while(shift_len--)  dotmatrix_buffer_shift(SHIFT_DELAY_MS);
    }
    return 0 ;
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
</file>
<file c dotfont.h>
/* vincent font from 
http://forum.osdev.org/viewtopic.php?f=2&t=22033&start=0&sid=d8da9a564483052518f8d632556c617f */
const unsigned char VINCENT_FONT[128][8] = { 
	{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, 
	{ 0x00, 0x3E, 0x41, 0x55, 0x41, 0x55, 0x49, 0x3E }, 
	{ 0x00, 0x3E, 0x7F, 0x6B, 0x7F, 0x6B, 0x77, 0x3E }, 
	{ 0x00, 0x22, 0x77, 0x7F, 0x7F, 0x3E, 0x1C, 0x08 }, 
	{ 0x00, 0x08, 0x1C, 0x3E, 0x7F, 0x3E, 0x1C, 0x08 }, 
	{ 0x00, 0x08, 0x1C, 0x2A, 0x7F, 0x2A, 0x08, 0x1C }, 
	{ 0x00, 0x08, 0x1C, 0x3E, 0x7F, 0x3E, 0x08, 0x1C }, 
	{ 0x00, 0x00, 0x1C, 0x3E, 0x3E, 0x3E, 0x1C, 0x00 }, 
	{ 0xFF, 0xFF, 0xE3, 0xC1, 0xC1, 0xC1, 0xE3, 0xFF }, 
	{ 0x00, 0x00, 0x1C, 0x22, 0x22, 0x22, 0x1C, 0x00 }, 
	{ 0xFF, 0xFF, 0xE3, 0xDD, 0xDD, 0xDD, 0xE3, 0xFF }, 
	{ 0x00, 0x0F, 0x03, 0x05, 0x39, 0x48, 0x48, 0x30 }, 
	{ 0x00, 0x08, 0x3E, 0x08, 0x1C, 0x22, 0x22, 0x1C }, 
	{ 0x00, 0x18, 0x14, 0x10, 0x10, 0x30, 0x70, 0x60 }, 
	{ 0x00, 0x0F, 0x19, 0x11, 0x13, 0x37, 0x76, 0x60 }, 
	{ 0x00, 0x08, 0x2A, 0x1C, 0x77, 0x1C, 0x2A, 0x08 }, 
	{ 0x00, 0x60, 0x78, 0x7E, 0x7F, 0x7E, 0x78, 0x60 }, 
	{ 0x00, 0x03, 0x0F, 0x3F, 0x7F, 0x3F, 0x0F, 0x03 }, 
	{ 0x00, 0x08, 0x1C, 0x2A, 0x08, 0x2A, 0x1C, 0x08 }, 
	{ 0x00, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x66 }, 
	{ 0x00, 0x3F, 0x65, 0x65, 0x3D, 0x05, 0x05, 0x05 }, 
	{ 0x00, 0x0C, 0x32, 0x48, 0x24, 0x12, 0x4C, 0x30 }, 
	{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0x7F, 0x7F }, 
	{ 0x00, 0x08, 0x1C, 0x2A, 0x08, 0x2A, 0x1C, 0x3E }, 
	{ 0x00, 0x08, 0x1C, 0x3E, 0x7F, 0x1C, 0x1C, 0x1C }, 
	{ 0x00, 0x1C, 0x1C, 0x1C, 0x7F, 0x3E, 0x1C, 0x08 }, 
	{ 0x00, 0x08, 0x0C, 0x7E, 0x7F, 0x7E, 0x0C, 0x08 }, 
	{ 0x00, 0x08, 0x18, 0x3F, 0x7F, 0x3F, 0x18, 0x08 }, 
	{ 0x00, 0x00, 0x00, 0x70, 0x70, 0x70, 0x7F, 0x7F }, 
	{ 0x00, 0x00, 0x14, 0x22, 0x7F, 0x22, 0x14, 0x00 }, 
	{ 0x00, 0x08, 0x1C, 0x1C, 0x3E, 0x3E, 0x7F, 0x7F }, 
	{ 0x00, 0x7F, 0x7F, 0x3E, 0x3E, 0x1C, 0x1C, 0x08 }, 
	{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, 
	{ 0x00, 0x18, 0x3C, 0x3C, 0x18, 0x18, 0x00, 0x18 }, 
	{ 0x00, 0x36, 0x36, 0x14, 0x00, 0x00, 0x00, 0x00 }, 
	{ 0x00, 0x36, 0x36, 0x7F, 0x36, 0x7F, 0x36, 0x36 }, 
	{ 0x00, 0x08, 0x1E, 0x20, 0x1C, 0x02, 0x3C, 0x08 }, 
	{ 0x00, 0x60, 0x66, 0x0C, 0x18, 0x30, 0x66, 0x06 }, 
	{ 0x00, 0x3C, 0x66, 0x3C, 0x28, 0x65, 0x66, 0x3F }, 
	{ 0x00, 0x18, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00 }, 
	{ 0x00, 0x06, 0x0C, 0x18, 0x18, 0x18, 0x0C, 0x06 }, 
	{ 0x00, 0x60, 0x30, 0x18, 0x18, 0x18, 0x30, 0x60 }, 
	{ 0x00, 0x00, 0x36, 0x1C, 0x7F, 0x1C, 0x36, 0x00 }, 
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