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.
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:
| 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