とりあえず、RasPi でC を検索したら一番最初にヒットしたので、これで。
オフィシャル
http://wiringpi.com/GITHUB
Ruby や PHP やPython などのラッパーもあるようです。とりあえず、c で。
インストールは、INSTALL か、オフィシャルサイトのドキュメントのように。build スクリプトがあります。
[root@pi wiringPi 12/04 05:34:23]# ./build
wiringPi Build script
=====================
WiringPi Library
[UnInstall]
[Compile] wiringPi.c
[Compile] wiringSerial.c
[Compile] piHiPri.c
[Compile] wiringShift.c
[Compile] piThread.c
[Compile] wiringPiSPI.c
[Compile] softPwm.c
[Compile] wiringPiI2C.c
[Compile] softTone.c
[Compile] mcp23008.c
[Compile] mcp23016.c
[Compile] mcp23017.c
[Compile] mcp23s08.c
[Compile] mcp23s17.c
[Compile] pcf8574.c
[Compile] sr595.c
[Compile] mcp3002.c
[Compile] pcf8591.c
[Compile] mcp3004.c
[Compile] mcp4802.c
[Compile] mcp3422.c
[Compile] max31855.c
[Compile] max5322.c
[Compile] sn3218.c
[Compile] drcSerial.c
[Compile] wpiExtensions.c
[Link (Dynamic)]
[Install Headers]
[Install Dynamic Lib]
WiringPi Devices Library
[UnInstall]
[Compile] ds1302.c
[Compile] maxdetect.c
[Compile] piNes.c
[Compile] gertboard.c
[Compile] piFace.c
[Compile] lcd128x64.c
[Compile] lcd.c
[Compile] piGlow.c
[Link (Dynamic)]
[Install Headers]
[Install Dynamic Lib]
GPIO Utility
[Compile] gpio.c
[Compile] readall.c
[Compile] pins.c
[Link]
[Install]
All Done.
NOTE: To compile programs with wiringPi, you need to add:
-lwiringPi
to your compile line(s) To use the Gertboard, MaxDetect, etc.
code (the devLib), you need to also add:
-lwiringPiDev
to your compile line(s).
[root@pi wiringPi 12/04 05:38:22]# gpio -v
gpio version: 2.31
Copyright (c) 2012-2015 Gordon Henderson
This is free software with ABSOLUTELY NO WARRANTY.
For details type: gpio -warranty
Raspberry Pi Details:
Type: Pi 2, Revision: 01, Memory: 1024MB, Maker: Embest
Device tree is enabled.
* Root or sudo required for GPIO access.
[root@pi wiringPi 12/04 05:38:41]#
こんな感じになりました。
[root@pi wiringPi 12/04 05:38:45]# gpio -v gpio version: 2.31 Copyright (c) 2012-2015 Gordon Henderson This is free software with ABSOLUTELY NO WARRANTY. For details type: gpio -warranty Raspberry Pi Details: Type: Pi 2, Revision: 01, Memory: 1024MB, Maker: Embest Device tree is enabled. * Root or sudo required for GPIO access. [root@pi wiringPi 12/04 05:38:46]#
というバージョンを使っています。Gordon Hendersonさんが作られてたようです。感謝。
[root@pi work 12/04 06:17:08]# gpio -warranty
gpio version: 2.31
Copyright (c) 2012-2015 Gordon Henderson
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Leser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
[root@pi work 12/04 06:17:14]#
とりあえず、使ってみます。
いつもPIN番号を忘れて検索します。貼り付けておくことに。ラズパイのピン。
コードは以下。
// Include header file
#include <wiringPi.h>
// Define GPIO21 number
#define LED 21
// Main function
int main(void) {
int i;
// Initialize WiringPi
if(wiringPiSetupGpio() == -1) return 1;
// Set GPIO pin to output mode
pinMode(LED, OUTPUT);
// Repeat LED blinking 10 times
for(i=0; i<100; i++){
digitalWrite(LED, 0);
delay(100);
digitalWrite(LED, 1);
delay(100);
}
// Turn off LED
digitalWrite(LED, 0);
return 0;
}
コンパイル、実行。
[pi@pi work]gcc -o blink blink.c -lwiringPi
[pi@pi work] sudo ./blink
終了すると、プロンプトに戻ります。RasPi のGPIOはたくさんあるので、同時にいくつ使えるんでしょうね。
シフトレジスターを経由しなくても、今回、15本のGPIOを使えればよさそうですが、
[root@pi work 12/04 06:26:32]# gpio readall +-----+-----+---------+------+---+---Pi 2---+---+------+---------+-----+-----+ | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM | +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+ | | | 3.3v | | | 1 || 2 | | | 5v | | | | 2 | 8 | SDA.1 | ALT0 | 1 | 3 || 4 | | | 5V | | | | 3 | 9 | SCL.1 | ALT0 | 1 | 5 || 6 | | | 0v | | | | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 | | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 | | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 | | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | | | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 | | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 | | 10 | 12 | MOSI | ALT0 | 0 | 19 || 20 | | | 0v | | | | 9 | 13 | MISO | ALT0 | 0 | 21 || 22 | 0 | OUT | GPIO. 6 | 6 | 25 | | 11 | 14 | SCLK | ALT0 | 0 | 23 || 24 | 1 | ALT0 | CE0 | 10 | 8 | | | | 0v | | | 25 || 26 | 1 | ALT0 | CE1 | 11 | 7 | | 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 | | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | | | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 | | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | | | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 | | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 | | | | 0v | | | 39 || 40 | 0 | OUT | GPIO.29 | 29 | 21 | +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+ | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM | +-----+-----+---------+------+---+---Pi 2---+---+------+---------+-----+-----+ [root@pi work 12/04 06:26:33]#
このテーブルのwPi というのがアサインされている番号ですかね。
マニュアルだと、以下のようです。1 でON（点灯） 0でOFF（消灯）
[root@pi work 12/04 06:32:40]# gpio -g write 21 1 [root@pi work 12/04 06:33:56]# gpio -g write 21 0
とりあえず、使えそうですね。あとは、プログラムの問題となります。さぁて、本日金曜日。お仕事終わればまた開発タイムです。
examples ディレクトリに参考コードがたくさんあります。
[root@pi examples 12/04 06:41:26]# pwd /home/pi/wiringPi/examples [root@pi examples 12/04 06:41:28]# [root@pi examples 12/04 06:41:29]# tree . ├── blink12.c ├── blink12drcs.c ├── blink6drcs.c ├── blink8.c ├── blink.c ├── blink.rtb ├── blink.sh ├── clock.c ├── COPYING.LESSER ├── delayTest.c ├── ds1302.c ├── Gertboard │ ├── 7segments.c │ ├── buttons.c │ ├── gertboard.c │ ├── Makefile │ ├── record.c │ ├── temperature.c │ ├── voltmeter.c │ └── vumeter.c ├── header.h ├── isr.c ├── isr-osc.c ├── lcd-adafruit.c ├── lcd.c ├── lowPower.c ├── Makefile ├── max31855.c ├── nes.c ├── okLed.c ├── PiFace │ ├── blink.c │ ├── buttons.c │ ├── ladder.c │ ├── Makefile │ ├── metro.c │ ├── motor.c │ └── reaction.c ├── PiGlow │ ├── Makefile │ ├── piGlow0.c │ ├── piGlow1.c │ └── piglow.c ├── pwm.c ├── q2w │ ├── binary.c │ ├── blink.c │ ├── blink-io.c │ ├── blink.sh │ ├── bright.c │ ├── button.c │ ├── Makefile │ └── volts.c ├── README.TXT ├── rht03.c ├── serialRead.c ├── serialTest.c ├── servo.c ├── softPwm.c ├── softTone.c ├── speed.c ├── spiSpeed.c └── wfi.c 4 directories, 59 files [root@pi examples 12/04 06:41:32]#
コハクラフトさんからも発送されたようで、土日にはなんらか楽しめそうです。
ピンバック: OPIでLチカ GPIOをC で | junkhack