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 WLANBPI-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.http://img.blog.itpub.net/blog/2021/04/06/3b427857834ee523.jpeg?x-oss-process=style/bb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:http://img.blog.itpub.net/blog/2021/04/06/776d117df6734f8c.jpeg?x-oss-process=style/bbBanana pi BPI-R2 40 PIN GPIO 定义
GPIO Pin NameDefault Function
CON1-P01VCC-3V3
CON1-P02VCC-5V
CON1-P03I2C\_SDA0GPIO75
CON1-P04VCC-5V
CON1-P05I2C\_SCL0GPIO76
CON1-P06GND
CON1-P07PWM-003GPIO206
CON1-P08UTXD1GPIO80
CON1-P09GND
CON1-P10URXD0GPIO81
CON1-P11URXD1GPIO80
CON1-P12I2S0\_BCKGPIO74
CON1-P13UTXD0GPIO79
CON1-P14GND
CON1-P15PWM-002GPIO205
CON1-P16URTS1GPIO25
CON1-P17VCC-3V3
CON1-P18UCTS1GPIO24
CON1-P19SPI0\_MOGPIO56
CON1-P20GND
CON1-P21SPI0\_MIGPIO55
CON1-P22PCM\_CLKGPIO18
CON1-P23SPI0\_CKGPIO54
CON1-P24SPI0\_CSNGPIO53
CON1-P25GND
CON1-P26PCM\_RXGPIO20
CON1-P27I2C\_SDA1GPIO57
CON1-P28I2C\_SCL1GPIO58
CON1-P29PCM\_RSTGPIO22
CON1-P30GND
CON1-P31SPDIF\_OUTGPIO200
CON1-P32PCM\_TXGPIO21
CON1-P33I2S0\_MCLKGPIO126
CON1-P34GND
CON1-P35I2S0\_LRCKGPIO73
CON1-P36PCM\_SYNCGPIO19
CON1-P37SPDIF\_IN1GPIO202
CON1-P38I2S0\_DATA\_INGPIO72
CON1-P39GND
CON1-P40I2S0\_DATA\_OUTGPI049
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
页:
[1]