如何使用 开源硬件Banana PI BPI-R2‘s GPIO-s

BPI-R2集成MTK7623N 四核 ARM Cortex-A7 MP 支持主频1.3 ghz,BPI-R2 路由器提供丰富各种外设接口,包括 HDMI TX 高清接口, MIPI DSI 屏接口, PCIe2.0 接口, USB2.0 OTG 端口, USB3.0 端口, SATA 端口,5 千兆网口, 板载802.11a/b/g/n wifi 无线& BT4.1蓝牙 , 并且通过mini PCI-e支持 802.11ac/n WLAN

BPI-R2 系统支持 Android5.1,并完善支持 OpenWRT,Debian linux,Ubuntu linux, Raspbian 和其他嵌入式操作系统. 尺寸与BPI-R1完全一样大小, 支持 1080P y高清视频输入,40 PIN GPIO 与 Raspberry Pi 3一致.

如何使用 开源硬件Banana PI BPI-R2‘s GPIO-s_第1张图片

同香蕉派其他板一样,Banana Pi BPI-R2 也有40-pin GPIO 接口:

Banana Pi BPI-R2 的40 PIN GPIO 定义与树莓派 3 一亲,下面是 Banana Pi GPIO定义:

如何使用 开源硬件Banana PI BPI-R2‘s GPIO-s_第2张图片

 

Banana pi BPI-R2 40 PIN GPIO 定义
GPIO Pin Name Default Function    
CON1-P01 VCC-3V3    
CON1-P02 VCC-5V    
CON1-P03 I2C\_SDA0 GPIO75  
CON1-P04 VCC-5V    
CON1-P05 I2C\_SCL0 GPIO76  
CON1-P06 GND    
CON1-P07 PWM-003 GPIO206  
CON1-P08 UTXD1 GPIO80  
CON1-P09 GND    
CON1-P10 URXD0 GPIO81  
CON1-P11 URXD1 GPIO80  
CON1-P12 I2S0\_BCK GPIO74  
CON1-P13 UTXD0 GPIO79  
CON1-P14 GND    
CON1-P15 PWM-002 GPIO205  
CON1-P16 URTS1 GPIO25  
CON1-P17 VCC-3V3    
CON1-P18 UCTS1 GPIO24  
CON1-P19 SPI0\_MO GPIO56  
CON1-P20 GND    
CON1-P21 SPI0\_MI GPIO55  
CON1-P22 PCM\_CLK GPIO18  
CON1-P23 SPI0\_CK GPIO54  
CON1-P24 SPI0\_CSN GPIO53  
CON1-P25 GND    
CON1-P26 PCM\_RX GPIO20  
CON1-P27 I2C\_SDA1 GPIO57  
CON1-P28 I2C\_SCL1 GPIO58  
CON1-P29 PCM\_RST GPIO22  
CON1-P30 GND    
CON1-P31 SPDIF\_OUT GPIO200  
CON1-P32 PCM\_TX GPIO21  
CON1-P33 I2S0\_MCLK GPIO126  
CON1-P34 GND    
CON1-P35 I2S0\_LRCK GPIO73  
CON1-P36 PCM\_SYNC GPIO19  
CON1-P37 SPDIF\_IN1 GPIO202  
CON1-P38 I2S0\_DATA\_IN GPIO72  
CON1-P39 GND    
CON1-P40 I2S0\_DATA\_OUT GPI049
 
 

 

有两种方式使用R2的GPIO-s:

使用调试接口/sys/devices/platform/1000b000。pinctrl/mt_gpio,参考脚本1

使用GPIO的通用接口:/sys/class/ GPIO /export和/sys/class/ GPIO /unexport,请参考脚本2

 

Script 1 (it can be used on Ubuntu system with kernel 4.4.x)

--------------------

    SYS_FILE=/sys/devices/platform/1000b000.pinctrl/mt_gpio

    mt_gpio_mode()

    {

       pin=$1

       mode=$2

      

       if [ ! -f ${SYS_FILE} ]; then

           exit 1

       fi

 

       echo "mode $pin $mode" > ${SYS_FILE}

 

       return 0   

    }

 

    mt_gpio_dir()

    {

       pin=$1

       dir=$2

     

       if [ "x${dir}" == "xout" ]; then

           dir_val=1

       else

           dir_val=0

       fi

     

       if [ ! -f ${SYS_FILE} ]; then

           exit 1

       fi

 

       echo "dir $pin $dir_val" > ${SYS_FILE}

 

       return 0   

    }

 

    mt_gpio_out()

    {

       pin=$1

       out=$2

     

       if [ ! -f ${SYS_FILE} ]; then

           exit 1

       fi

 

       echo "out $pin $out" > ${SYS_FILE}

 

       return 0   

    }

 

    mt_gpio_in()

    {

       pin=$1

     

       if [ ! -f ${SYS_FILE} ]; then

           exit 1

       fi

 

       echo "start $1" > ${SYS_FILE}

       result=`cat ${SYS_FILE} | grep "$1"`

 

       if [ "x${result}" == "x" ]; then

           echo "can't get $pin status"

           exit 2

       fi

       echo ${result}

       pin_val=`echo ${result} | awk -F ' |-' '{print $5}'`

       if [ ${pin_val} == "0" ] ; then

           return 0

       else

           return 1

       fi

      

       return 0

 

    }

 

 

 

Script 2  (it can be used on Ubuntu system with kernel 4.4.x, and lede with kernel 4.9.x)

----------

    #!/bin/ash

 

    DIR=/sys/class/gpio/

 

    global_gpio_offset=0

 

    mt_gpio_init()

    {

        pin=$1

 

        EXPORT=/sys/class/gpio/export

        UNEXPORT=/sys/class/gpio/unexport

 

 

        name=`ls $DIR | grep chip`

        if [ x${name} != x ]; then

            echo "chip id : $name"

        else

            echo "No available gpio chip"

            exit 1

        fi

 

        base=`cat ${DIR}/${name}/base`

 

        gpio_offset=`echo $((base+$pin))`

        global_gpio_offset=$gpio_offset

 

        if [ -d ${DIR}/gpio${gpio_offset} ]; then

            return 0

        else

            echo ${gpio_offset} > ${EXPORT}

        fi

    }

 

    mt_gpio_init $1

 

    if [ $2 == 'dir' ]; then

        if [ $3 == 'out' ]; then

            echo out > ${DIR}/gpio${global_gpio_offset}/direction

        else

            echo in > ${DIR}/gpio${global_gpio_offset}/direction

        fi

    elif [ $2 == 'val' ]; then

        if [ $# == 2 ]; then

            cat ${DIR}/gpio${global_gpio_offset}/value

        elif [ $# == 3 ]; then

            echo $3 >  ${DIR}/gpio${global_gpio_offset}/value

        fi   

    fi 

 

 

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