kopia lustrzana https://github.com/dettus/oledtest
352 wiersze
8.0 KiB
C
352 wiersze
8.0 KiB
C
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/*
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MIT No Attribution
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Copyright 2022 Thomas Dettbarn (dettus@dettus.net)
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Permission is hereby granted, free of charge, to any person obtaining a copy of this
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software and associated documentation files (the "Software"), to deal in the Software
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without restriction, including without limitation the rights to use, copy, modify,
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merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#define RETVAL_OK 0
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#define RETVAL_NOK -1
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#define GPIO_INPUT 0
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#define GPIO_OUTPUT 1
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#define MAXBUFLEN 64
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#define DELAY_US(us) usleep((us));
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#define DELAY_MS(ms) usleep((ms)*1000);
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#define SPI_MODE0 0
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#define SPI_MODE1 1
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#define SPI_MODE2 2
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#define SPI_MODE3 3
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#define SPI_LSBFIRST 0
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#define SPI_MSBFIRST 1
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#define SPI_DELAY //DELAY_US(1)
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#define BITMAP_HEIGHT 64
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#define BITMAP_WIDTH 128
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//// depends on the development board
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// the way I understand this is, that the physical pins are mapped into
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// the system memory. to accces those, there is some sort of memory
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// offset maybe
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#if 0
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#warning "This mapping is for the Jetson Nano board."
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// Jetson Nano
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// source: https://maker.pro/nvidia-jetson/tutorial/how-to-use-gpio-pins-on-jetson-nano-developer-kit
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const short physicalmapping[41]={
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0, // placeholder. there is no PIN0
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-1, -1,// PIN1 =3.3V DC, PIN2 =5V DC
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-1, -1,
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-1, -1,
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216, -1, //PIN7 = AUDIO_MCLK
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-1, -1,
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50, 79, //PIN11=UART_2_RTS,PIN12=I2S_4_CLK
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14, -1,
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194,232,
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-1, 15,
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16, -1,
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17, 13,
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18, 19,
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-1, 20,
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-1, -1,
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149, -1,
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200,168,
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38, -1,
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76, 51,
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12, 77,
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-1, 78
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};
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#elif 0
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#warning "This mapping is for the Banana Pi board."
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// source: https://wiki.fw-web.de/doku.php?id=en:bpi-r64:gpio
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const short physicalmapping[41]={
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0, // placeholder. there is no PIN0
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-1, -1,// PIN1 =3.3V DC, PIN2 =5V DC
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56, -1,// 3,4
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55, -1,// 5,6
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101, 59, //PIN7 = PWM7,8
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-1, 60,// 9,10
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51, -1, //PIN11=UART_2_RTS,PIN12=I2S_4_CLK
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52, -1, //13,14
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98, 61, //15,16
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-1, 62, //17,18
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68, -1, //19,20
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69, 63, //21,22
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67, 70, //23,24
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-1, 66, //25,26
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58, 57, //27,28
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85, -1, //29,30
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82, 64, //31,32
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-1, -1, //33,34
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-1, 65, //35,36
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86, -1, //37,38
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-1, -1 //39,40
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};
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#elif 1
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#warning "This mapping is for the Raspberry Pi Zero W 1.1 board"
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// source: https://www.theengineeringprojects.com/wp-content/uploads/2021/03/raspberry-pi-zero-5.png
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// NOTE: GPIO16 was actually missing in the diagram.
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const short physicalmapping[41]={
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0, // placeholder. there is no PIN0
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-1, -1,// PIN1 =3.3V DC, PIN2 =5V DC
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2, -1,// 3,4
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3, -1,// 5,6
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4, 14, //PIN7 = PWM7,8
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-1, 15,// 9,10
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17, 18, //PIN11=UART_2_RTS,PIN12=I2S_4_CLK
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27, -1, //13,14
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22, 23, //15,16
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-1, 24, //17,18
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10, -1, //19,20
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9, 25, //21,22
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11, 8, //23,24
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-1, 7, //25,26
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0, 1, //27,28
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5, -1, //29,30
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6, 12, //31,32
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13, -1, //33,34
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19, 16, //35,36
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26, 20, //37,38
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-1, 21 //39,40
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};
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#else
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#error "Please have a look at the source code and select one of the mappings from the sysfs numbering to the physical pins"
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#endif
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// this is the GPIO pinout for the waveshare OLED 1.3 SH1106 hat
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// source: https://www.waveshare.com/1.3inch-oled-hat.htm
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#define PIN_LEFT (physicalmapping[29])
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#define PIN_UP (physicalmapping[31])
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#define PIN_FIRE (physicalmapping[33])
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#define PIN_DOWN (physicalmapping[35])
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#define PIN_RIGHT (physicalmapping[37])
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#define PIN_KEY1 (physicalmapping[36])
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#define PIN_KEY2 (physicalmapping[38])
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#define PIN_KEY3 (physicalmapping[40])
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#define PIN_BL (physicalmapping[12])
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#define PIN_DC (physicalmapping[18])
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#define PIN_RST (physicalmapping[22])
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#define PIN_CS (physicalmapping[24])
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#define PIN_MOSI (physicalmapping[19])
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#define PIN_MISO (physicalmapping[21])
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#define PIN_SCLK (physicalmapping[23])
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int gpio_export(int pin)
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{
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int fd;
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char buffer[MAXBUFLEN];
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int len;
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fd=open("/sys/class/gpio/export", O_WRONLY);
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if (fd<0)
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{
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fprintf(stderr,"GPIO export for pin %d failed\n",pin);
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return RETVAL_NOK;
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}
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len=snprintf(buffer,MAXBUFLEN,"%d",pin);
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write(fd,buffer,len);
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close(fd);
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return RETVAL_OK;
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}
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int gpio_unexport(int pin)
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{
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int fd;
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char buffer[MAXBUFLEN];
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int len;
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fd=open("/sys/class/gpio/unexport", O_WRONLY);
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if (fd<0)
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{
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fprintf(stderr,"GPIO unexport for pin %d failed\n",pin);
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return RETVAL_NOK;
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}
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len=snprintf(buffer,MAXBUFLEN,"%d",pin);
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write(fd,buffer,len);
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close(fd);
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return RETVAL_OK;
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}
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int gpio_direction(int pin,int direction)
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{
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int fd;
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char buffer[MAXBUFLEN];
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snprintf(buffer,MAXBUFLEN,"/sys/class/gpio/gpio%d/direction",pin);
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fd=open(buffer,O_WRONLY);
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if (fd<0)
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{
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fprintf(stderr,"GPIO direction for pin %d cannot be set\n",pin);
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return RETVAL_NOK;
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}
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if (direction==GPIO_INPUT)
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{
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write(fd,"in",2);
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} else if (direction==GPIO_OUTPUT) {
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write(fd,"out",3);
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} else {
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fprintf(stderr,"Type error for direction for pin %d (%d unknown)\n",pin,direction);
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}
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close(fd);
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return RETVAL_OK;
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}
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int gpio_write(int pin,int value)
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{
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int fd;
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char buffer[MAXBUFLEN];
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snprintf(buffer,MAXBUFLEN,"/sys/class/gpio/gpio%d/value",pin);
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fd=open(buffer,O_WRONLY);
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if (fd<0)
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{
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fprintf(stderr,"Cannot access GPIO pin %d\n",pin);
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return RETVAL_NOK;
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}
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write(fd,value?"1":"0",1);
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close(fd);
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return RETVAL_OK;
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}
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int gpio_read(int pin,int* value)
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{
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int fd;
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char buffer[MAXBUFLEN];
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int len;
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snprintf(buffer,MAXBUFLEN,"/sys/class/gpio/gpio%d/value",pin);
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fd=open(buffer,O_RDONLY);
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if (fd<0)
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{
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fprintf(stderr,"Cannot access GPIO pin %d\n",pin);
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return RETVAL_NOK;
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}
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len=read(fd,buffer,3);
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if (len<0)
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{
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fprintf(stderr,"Unable to read from pin %d\n",pin);
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close(fd);
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return RETVAL_NOK;
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}
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*value=atoi(buffer);
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close(fd);
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return RETVAL_OK;
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}
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int gpio_pins_up()
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{
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int retval;
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retval=RETVAL_OK;
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// start with the GPIO configuration
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retval|=gpio_export(PIN_LEFT);
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retval|=gpio_export(PIN_UP);
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retval|=gpio_export(PIN_FIRE);
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retval|=gpio_export(PIN_DOWN);
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retval|=gpio_export(PIN_RIGHT);
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retval|=gpio_export(PIN_KEY1);
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retval|=gpio_export(PIN_KEY2);
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retval|=gpio_export(PIN_KEY3);
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retval|=gpio_direction(PIN_LEFT, GPIO_INPUT);
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retval|=gpio_direction(PIN_UP, GPIO_INPUT);
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retval|=gpio_direction(PIN_FIRE, GPIO_INPUT);
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retval|=gpio_direction(PIN_DOWN, GPIO_INPUT);
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retval|=gpio_direction(PIN_RIGHT, GPIO_INPUT);
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retval|=gpio_direction(PIN_KEY1, GPIO_INPUT);
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retval|=gpio_direction(PIN_KEY2, GPIO_INPUT);
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retval|=gpio_direction(PIN_KEY3, GPIO_INPUT);
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return retval;
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}
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int gpio_pins_down()
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{
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int retval;
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retval=RETVAL_OK;
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retval|=gpio_unexport(PIN_LEFT);
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retval|=gpio_unexport(PIN_UP);
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retval|=gpio_unexport(PIN_FIRE);
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retval|=gpio_unexport(PIN_DOWN);
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retval|=gpio_unexport(PIN_RIGHT);
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retval|=gpio_unexport(PIN_KEY1);
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retval|=gpio_unexport(PIN_KEY2);
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retval|=gpio_unexport(PIN_KEY3);
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return retval;
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}
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int sh1106_up()
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{
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int retval;
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retval=RETVAL_OK;
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retval|=gpio_pins_up();
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return retval;
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}
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int sh1106_down()
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{
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return gpio_pins_down();
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}
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void graceFulExit(int signal_number)
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{
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printf("shutting down ...\n");
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sh1106_down();
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exit(0);
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}
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int main(int argc,char** argv)
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{
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char *names[8]={"LEFT","UP","FIRE","DOWN","RIGHT","KEY1","KEY2","KEY3"};
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int pins[8]={PIN_LEFT,PIN_UP,PIN_FIRE,PIN_DOWN,PIN_RIGHT,PIN_KEY1,PIN_KEY2,PIN_KEY3};
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int lastval[8]={0};
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signal(SIGINT, graceFulExit);
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if (sh1106_up())
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{
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fprintf(stderr,"unable to start up pins. sorry.\n");
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return 1;
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}
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while (1)
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{
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int i;
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for (i=0;i<8;i++)
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{
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int val;
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gpio_read(pins[i],&val);
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if (val!=lastval[i])
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{
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printf("%8s %d->%d\n",names[i],lastval[i],val);
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}
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lastval[i]=val;
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}
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}
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graceFulExit(0);
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return 0;
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}
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