Matrix - RTC

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1 Introduction

Matrix-RTC.png

2 Features

Matrix-RTC PCB.png

  • Pin Description:
Pin Description
SDA I2C SDA
SCL I2C SCL
5V Supply Voltage 5V
GND Ground

3 Basic Device Operation

4 Download Matrix Source Code

All the matrix modules' code samples are open source. They are maintained on GitHub - git://github.com/friendlyarm/matrix.git
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with.

  • The nanopi branch contains the matrix modules' code samples for the NanoPi
  • the tiny4412 branch contains the matrix modules' code samples for the Tiny4412
  • the raspberrypi branch contains the matrix modules' code samples for the RaspberryPi

Please follow the steps below to get the source code:
Install the git utility on a PC running Ubuntu14.04 

$ sudo apt-get install git

Clone the matrix code from GitHub 

$ git clone git://github.com/friendlyarm/matrix.git

If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.

5 Connect to NanoPi

5.1 Preparations

Please install a Debian on a NanoPi and an appropriate cross compiler on a PC. Please refer to wiki:NanoPi
Compile a NanoPi kernel. Note: please use the kernel's source code from the nanopi-v4.1.y-matrix branch.

$ git clone https://github.com/friendlyarm/linux-4.x.y.git
$ cd linux-4.x.y
$ git checkout nanopi-v4.1.y-matrix
$ make nanopi_defconfig
$ touch .scmversion
$ make

5.2 Hardware Connection

Please refer to the following connection diagram to connect the Matrix-RTC to the NanoPi
Matrix-RTC_nanopi

连接说明：

Matrix-RTC_nanopi NanoPi
SDA Pin3
SCL Pin5
5V Pin4
GND Pin6

5.3 Compile Test Program

Please login the matrix hub and enter the nanopi branch 

$ cd matrix
$ git checkout nanopi

Compile the matrix code 

$ make CROSS_COMPILE=arm-linux- clean
$ make CROSS_COMPILE=arm-linux-
$ make CROSS_COMPILE=arm-linux- install

Note: please make sure to install the cross compiler "arm-linux-gcc-4.4.3" on your PC, which is used to compile files for the NanoPi-Debian.
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-RTC" module is "matrix-rtc".

5.4 运行测试程序

拷贝库文件和测试程序到NanoPi的文件系统上 

$ cp install/usr/bin/* nanopi_rootfs/usr/bin/
$ cp install/lib/* nanopi_rootfs/lib/ -d

然后启动NanoPi，在Debian的shell终端中执行以下命令加载驱动 

$ modprobe rtc-ds1307

运行模块Matrix-RTC的测试程序
注意：此模块并不支持热插拔，启动系统前需要确保硬件正常连接。 

$ matrix-rtc

5.5 代码展示

static const char default_rtc[] = "/dev/rtc0";
static const char default_date_time[] = "2015 9 15 1 1 1";
int main(int argc, char **argv)
{
    int fd, retval;
    struct rtc_time rtc_tm;
    const char *rtc = default_rtc;
    const char *date_time = default_date_time;
 
    switch (argc) {
    case 3:
        rtc = argv[1];
        date_time = argv[2];
        break;
    case 1:
        break;
    default:
        fprintf(stderr, "usage:  rtctest [rtcdev] [year mon day hour min sec]\n");
        return 1;
    }
 
    fd = open(rtc, O_RDONLY);
 
    if (fd ==  -1) {
        perror(rtc);
        exit(errno);
    }
    fprintf(stderr, "RTC Driver Test Example.\n");
 
    sscanf(date_time, "%d %d %d %d %d %d",
            &rtc_tm.tm_year,
            &rtc_tm.tm_mon,
            &rtc_tm.tm_mday,
            &rtc_tm.tm_hour,
            &rtc_tm.tm_min,
            &rtc_tm.tm_sec); 
    rtc_tm.tm_year -= 1900;
    rtc_tm.tm_mon -= 1;
    retval = ioctl(fd, RTC_SET_TIME, &rtc_tm);
    if (retval == -1) {
        perror("RTC_SET_TIME ioctl");
        exit(errno);
    }
 
    fprintf(stderr, "Set RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
        rtc_tm.tm_mon + 1, rtc_tm.tm_mday, rtc_tm.tm_year + 1900,
        rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
 
    /* Read the RTC time/date */
    retval = ioctl(fd, RTC_RD_TIME, &rtc_tm);
    if (retval == -1) {
        perror("RTC_RD_TIME ioctl");
        exit(errno);
    }
 
    fprintf(stderr, "Read RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
        rtc_tm.tm_mon + 1, rtc_tm.tm_mday, rtc_tm.tm_year + 1900,
        rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
 
    fprintf(stderr, "Test complete\n");
    close(fd);
    return 0;
}

6 与Tiny4412连接使用

6.1 准备工作

参考Tiny4412光盘里的《友善之臂Ubuntu使用手册》，在Tiny4412上运行UbuntuCore系统，然后在主机PC上安装并使用相应的编译器。
注意：只能使用Tiny4412SDK-1506的底板。

6.2 硬件连接

参考下图连接模块Matrix-RTC和Tiny4412
Matrix-RTC_tiny4412

连接说明：

Matrix-RTC Tiny4412
SDA CON18 SDA
SCL CON18 SCL
5V CON18 5V
GND CON18 GND

6.3 编译测试程序

进入Matrix代码仓库，切换到tiny4412分支 

$ cd matrix
$ git checkout tiny4412

编译Matrix配件代码 

$ make CROSS_COMPILE=arm-linux-gnueabihf- clean
$ make CROSS_COMPILE=arm-linux-gnueabihf-
$ make CROSS_COMPILE=arm-linux-gnueabihf- install

注意：请确保你的主机PC当前使用的交叉编译器为Tiny4412-UbuntuCore配套的arm-linux-gnueabihf-gcc-4.7.3。
编译出来的库文件位于install/lib目录下，而测试程序则位于install/usr/bin目录下，模块Matrix-RTC对应的测试程序为matrix-rtc。

6.4 运行测试程序

拷贝库文件和测试程序到Tiny4412的UbuntuCore的文件系统上 

$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/
$ cp install/lib/* tiny4412_rootfs/lib/ -d

然后启动Tiny4412，在UbuntuCore的shell终端中执行以下命令加载驱动 

$ modprobe bmp085-i2c

运行模块Matrix-RTC的测试程序
注意：此模块并不支持热插拔，启动系统前需要确保硬件正常连接。 

$ matrix-rtc

6.5 代码展示

static const char default_rtc[] = "/dev/rtc0";
static const char default_date_time[] = "2015 9 15 1 1 1";
int main(int argc, char **argv)
{
    int fd, retval;
    struct rtc_time rtc_tm;
    const char *rtc = default_rtc;
    const char *date_time = default_date_time;
 
    switch (argc) {
    case 3:
        rtc = argv[1];
        date_time = argv[2];
        break;
    case 1:
        break;
    default:
        fprintf(stderr, "usage:  rtctest [rtcdev] [year mon day hour min sec]\n");
        return 1;
    }
 
    fd = open(rtc, O_RDONLY);
 
    if (fd ==  -1) {
        perror(rtc);
        exit(errno);
    }
    fprintf(stderr, "RTC Driver Test Example.\n");
 
    sscanf(date_time, "%d %d %d %d %d %d",
            &rtc_tm.tm_year,
            &rtc_tm.tm_mon,
            &rtc_tm.tm_mday,
            &rtc_tm.tm_hour,
            &rtc_tm.tm_min,
            &rtc_tm.tm_sec); 
    rtc_tm.tm_year -= 1900;
    rtc_tm.tm_mon -= 1;
    retval = ioctl(fd, RTC_SET_TIME, &rtc_tm);
    if (retval == -1) {
        perror("RTC_SET_TIME ioctl");
        exit(errno);
    }
 
    fprintf(stderr, "Set RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
        rtc_tm.tm_mon + 1, rtc_tm.tm_mday, rtc_tm.tm_year + 1900,
        rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
 
    /* Read the RTC time/date */
    retval = ioctl(fd, RTC_RD_TIME, &rtc_tm);
    if (retval == -1) {
        perror("RTC_RD_TIME ioctl");
        exit(errno);
    }
 
    fprintf(stderr, "Read RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
        rtc_tm.tm_mon + 1, rtc_tm.tm_mday, rtc_tm.tm_year + 1900,
        rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
 
    fprintf(stderr, "Test complete\n");
    close(fd);
    return 0;
}

7 与RaspberryPi连接使用

8 与Arduino连接使用

9 相关资料

DS1307.pdf

Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=Matrix_-_RTC&oldid=2193"