kopia lustrzana https://github.com/dettus/oledtest
first draft of my oledtest.
rodzic
d37c33f1fa
commit
fe9e3421d4
30
LICENSE
30
LICENSE
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@ -1,21 +1,17 @@
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MIT License
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MIT No Attribution
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Copyright (c) 2022 dettus
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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
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Permission is hereby granted, free of charge, to any person obtaining a copy of this
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of this software and associated documentation files (the "Software"), to deal
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software and associated documentation files (the "Software"), to deal in the Software
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in the Software without restriction, including without limitation the rights
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without restriction, including without limitation the rights to use, copy, modify,
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||||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
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copies of the Software, and to permit persons to whom the Software is
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permit persons to whom the Software is furnished to do so.
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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copies or substantial portions of the Software.
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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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||||||
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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||||||
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
||||||
|
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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|
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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32
README.md
32
README.md
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@ -1,2 +1,34 @@
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# oledtest
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# oledtest
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Waveshare SH1106 on a Jetson Nano
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Waveshare SH1106 on a Jetson Nano
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# BACKGROUND
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So, I treated myself to a nice little Waveshare OLED 1.3 SH1106 board and tried to get it running
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with a BananaPi Zero. (Thus far, I failed.)
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The other day, I got my hands on a NVIDIA Jetson Nano, and was able to find a working example. It
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was okay, but not of the quality I was expecting. So I decided to come up with my own, and this
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is the result.
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# COMPILING
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Please have a look at the sourcecode. It is imperative that the GPIO numbering from the
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(deprecated) sysfs is being reflected in the physicalmapping[] array. Thus, the first time you
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try to compile it, it will fail.
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Find the #if 0 line which reflects your board, or find the correct sysfs mapping for your board.
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Really really sorry, this is what happens when you become a maker.
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Once you changed one of the #if 0 to #if 1, you can compile it with
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gcc -O3 -o oledtest.app oledtest.c
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IF YOU HAVE A NEW BOARD, PLEASE DO NOT HESITATE TO SEND ME THE MAPPING.
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dettus@dettus.net, make sure to include "OLEDTEST" somewhere in the subject line.
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# RUNNING
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Just run ./oledtest.app and watch the display. It should show you two alternating bitmaps.
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If it complains about a GPIO pin -1, your sysfs mapping does not work with the OLED hat.
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Then you have to do some rewiring. You need to find 7 GPIO pins which are free.
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@ -0,0 +1,19 @@
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#!/bin/sh
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#MIT No Attribution
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#
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#Copyright 2022 Thomas Dettbarn (dettus@dettus.net)
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#
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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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#
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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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||||||
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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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gcc -O3 -o oledtest.app oledtest.c
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@ -0,0 +1,454 @@
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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,
|
||||||
|
merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
|
||||||
|
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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#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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#define PIN_CS (physicalmapping[24])
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#define PIN_RST (physicalmapping[22])
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#define PIN_DC (physicalmapping[18])
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#define PIN_BL (physicalmapping[12])
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#define PIN_SCLK (physicalmapping[23])
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#define PIN_MOSI (physicalmapping[19])
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#define PIN_MISO (physicalmapping[21])
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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_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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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_RST);
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retval|=gpio_export(PIN_DC);
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retval|=gpio_export(PIN_BL);
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retval|=gpio_export(PIN_CS);
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retval|=gpio_direction(PIN_RST, GPIO_OUTPUT);
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retval|=gpio_direction(PIN_DC, GPIO_OUTPUT);
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retval|=gpio_direction(PIN_BL, GPIO_OUTPUT);
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retval|=gpio_direction(PIN_CS, GPIO_OUTPUT);
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||||||
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// continue with the SPI pins
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retval|=gpio_export(PIN_SCLK);
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retval|=gpio_export(PIN_MOSI);
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retval|=gpio_export(PIN_MISO);
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||||||
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retval|=gpio_direction(PIN_SCLK, GPIO_OUTPUT);
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retval|=gpio_direction(PIN_MOSI, GPIO_OUTPUT);
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retval|=gpio_direction(PIN_MISO, GPIO_INPUT);
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||||||
|
return retval;
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|
}
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||||||
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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_write(PIN_RST,0);
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retval|=gpio_write(PIN_DC,0);
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retval|=gpio_write(PIN_BL,0);
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retval|=gpio_unexport(PIN_RST);
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retval|=gpio_unexport(PIN_DC);
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retval|=gpio_unexport(PIN_BL);
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retval|=gpio_unexport(PIN_CS);
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retval|=gpio_write(PIN_SCLK,0);
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retval|=gpio_write(PIN_MOSI,0);
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||||||
|
retval|=gpio_unexport(PIN_SCLK);
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||||||
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retval|=gpio_unexport(PIN_MOSI);
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||||||
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retval|=gpio_unexport(PIN_MISO);
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||||||
|
|
||||||
|
return retval;
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||||||
|
}
|
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|
|
||||||
|
void spi_writebyte(unsigned char byte,int mode,int msbfirst)
|
||||||
|
{
|
||||||
|
int cpol;
|
||||||
|
int cpol0;
|
||||||
|
int cpha;
|
||||||
|
int bits;
|
||||||
|
|
||||||
|
switch (mode)
|
||||||
|
{
|
||||||
|
case SPI_MODE0: cpol=0;cpha=0;break;
|
||||||
|
case SPI_MODE1: cpol=0;cpha=1;break;
|
||||||
|
case SPI_MODE2: cpol=1;cpha=0;break;
|
||||||
|
case SPI_MODE3: cpol=1;cpha=1;break;
|
||||||
|
}
|
||||||
|
cpol0=cpol;
|
||||||
|
gpio_write(PIN_SCLK,cpol);
|
||||||
|
if (!cpha)
|
||||||
|
{
|
||||||
|
cpol=1-cpol; // when CPHA=1, the new value is being sampled at the first clock edge
|
||||||
|
SPI_DELAY;
|
||||||
|
}
|
||||||
|
for (bits=0;bits<8;bits++)
|
||||||
|
{
|
||||||
|
int bit;
|
||||||
|
if (msbfirst==SPI_MSBFIRST)
|
||||||
|
{
|
||||||
|
bit=(byte>>7)&1;
|
||||||
|
byte<<=1;
|
||||||
|
} else {
|
||||||
|
bit=(byte)&1;
|
||||||
|
byte>>=1;
|
||||||
|
}
|
||||||
|
gpio_write(PIN_MOSI,bit); // set the value
|
||||||
|
gpio_write(PIN_SCLK,cpol); // 1st clock edge
|
||||||
|
cpol=1-cpol;
|
||||||
|
SPI_DELAY;
|
||||||
|
gpio_write(PIN_SCLK,cpol); // 2nd clock edge
|
||||||
|
cpol=1-cpol;
|
||||||
|
SPI_DELAY;
|
||||||
|
}
|
||||||
|
gpio_write(PIN_SCLK,cpol0); // make sure that the SPI clk is the same as before
|
||||||
|
}
|
||||||
|
void oled_reset()
|
||||||
|
{
|
||||||
|
gpio_write(PIN_DC,0);
|
||||||
|
gpio_write(PIN_RST,1);
|
||||||
|
DELAY_MS(200);
|
||||||
|
gpio_write(PIN_RST,0);
|
||||||
|
DELAY_MS(200);
|
||||||
|
gpio_write(PIN_RST,1);
|
||||||
|
DELAY_MS(200);
|
||||||
|
}
|
||||||
|
void oled_init()
|
||||||
|
{
|
||||||
|
const unsigned char oled_commands[]={
|
||||||
|
0xae,0x02,0x10,0x40, 0x81,0xa0,0xc0,0xa6, // turn off oled panel, set low column addr, set high column addr, set start line, set contrast control register, set SEG/Column Mapping, Set COM/ROW scan direction, set normal display
|
||||||
|
0xa8,0x3f,0xd3,0x00, 0xd5,0x80,0xd9,0xf1, // set multiplex ration 1:64, 1/64 duty, set display offset, not offset, set display clock, set divide clock as 100frames/sec, set pre-charge period, set pre-chare as 15 clocks & discarge as 1 clock
|
||||||
|
0xda,0x12,0xdb,0x40, 0x20,0x02,0xa4,0xa6, // set com pins hardare, ???, set vcomh, set vcom deselect level, set page addr mode, ???, disable entire display on, disable inverse display on,
|
||||||
|
0xaf // turn on oled panel
|
||||||
|
};
|
||||||
|
int i;
|
||||||
|
gpio_write(PIN_DC,0);
|
||||||
|
for (i=0;i<sizeof(oled_commands);i++)
|
||||||
|
{
|
||||||
|
spi_writebyte(oled_commands[i],SPI_MODE0,SPI_MSBFIRST);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
void oled_draw(unsigned char* bitmap)
|
||||||
|
{
|
||||||
|
#define CANVAS_WIDTH 128
|
||||||
|
#define CANVAS_PAGES 8
|
||||||
|
unsigned char canvas[CANVAS_WIDTH*CANVAS_PAGES];
|
||||||
|
int i;
|
||||||
|
for (i=0;i<CANVAS_WIDTH*CANVAS_PAGES;i++)
|
||||||
|
{
|
||||||
|
// each byte in the canvas represents a column of 8 bits from the bitmap
|
||||||
|
// 0000
|
||||||
|
// 1111
|
||||||
|
// 2222
|
||||||
|
// 3333
|
||||||
|
// 4444
|
||||||
|
// ...
|
||||||
|
|
||||||
|
int j;
|
||||||
|
unsigned char byte;
|
||||||
|
int x,y;
|
||||||
|
byte=0;
|
||||||
|
x=i%BITMAP_WIDTH;
|
||||||
|
y=(i/BITMAP_WIDTH)*8;
|
||||||
|
for (j=0;j<8;j++)
|
||||||
|
{
|
||||||
|
int bit;
|
||||||
|
bit=bitmap[x+(y+j)*BITMAP_WIDTH]?0x80:0x00;
|
||||||
|
byte>>=1;
|
||||||
|
byte|=bit;
|
||||||
|
}
|
||||||
|
canvas[i]=byte;
|
||||||
|
}
|
||||||
|
|
||||||
|
for (i=0;i<CANVAS_PAGES;i++)
|
||||||
|
{
|
||||||
|
int j;
|
||||||
|
gpio_write(PIN_DC,0); // write command
|
||||||
|
spi_writebyte(0xb0+i,SPI_MODE0,SPI_MSBFIRST); // set page address
|
||||||
|
spi_writebyte(0x02,SPI_MODE0,SPI_MSBFIRST); // set low column address
|
||||||
|
spi_writebyte(0x10,SPI_MODE0,SPI_MSBFIRST); // set high column address
|
||||||
|
gpio_write(PIN_DC,1); // write data
|
||||||
|
for (j=0;j<CANVAS_WIDTH;j++)
|
||||||
|
{
|
||||||
|
spi_writebyte(canvas[i*CANVAS_WIDTH+j],SPI_MODE0,SPI_MSBFIRST);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
int sh1106_up()
|
||||||
|
{
|
||||||
|
int retval;
|
||||||
|
retval=RETVAL_OK;
|
||||||
|
retval|=gpio_pins_up();
|
||||||
|
// spi mode 0
|
||||||
|
// spi master
|
||||||
|
// spi clock div 2
|
||||||
|
// spi msbfirst
|
||||||
|
|
||||||
|
// ?? tell the device it should take orders from SPI??
|
||||||
|
retval|=gpio_write(PIN_BL,1);
|
||||||
|
retval|=gpio_write(PIN_CS,0);
|
||||||
|
|
||||||
|
if (retval==RETVAL_OK)
|
||||||
|
{
|
||||||
|
oled_reset();
|
||||||
|
oled_init();
|
||||||
|
}
|
||||||
|
return retval;
|
||||||
|
}
|
||||||
|
int sh1106_down()
|
||||||
|
{
|
||||||
|
return gpio_pins_down();
|
||||||
|
}
|
||||||
|
void graceFulExit(int signal_number)
|
||||||
|
{
|
||||||
|
printf("shutting down display...\n");
|
||||||
|
sh1106_down();
|
||||||
|
exit(0);
|
||||||
|
}
|
||||||
|
int main(int argc,char** argv)
|
||||||
|
{
|
||||||
|
unsigned char bitmap[BITMAP_WIDTH*BITMAP_HEIGHT]={0};
|
||||||
|
unsigned char bitmap2[BITMAP_WIDTH*BITMAP_HEIGHT]={0};
|
||||||
|
int i;
|
||||||
|
|
||||||
|
signal(SIGINT, graceFulExit);
|
||||||
|
if (sh1106_up())
|
||||||
|
{
|
||||||
|
fprintf(stderr,"unable to start up display. sorry");
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
for (i=0;i<BITMAP_WIDTH*BITMAP_HEIGHT;i++)
|
||||||
|
{
|
||||||
|
if ((i%10)<5) bitmap[i]=1;else bitmap[i]=0;
|
||||||
|
}
|
||||||
|
for (i=0;i<BITMAP_HEIGHT;i++)
|
||||||
|
{
|
||||||
|
bitmap2[i+i*BITMAP_WIDTH]=1;
|
||||||
|
}
|
||||||
|
// draw the two bitmaps, one after the other
|
||||||
|
for (i=0;i<10;i++)
|
||||||
|
{
|
||||||
|
oled_draw(bitmap);
|
||||||
|
printf("%d\n",i);
|
||||||
|
oled_draw(bitmap2);
|
||||||
|
}
|
||||||
|
printf("press Enter to quit\n");
|
||||||
|
fgets(bitmap,sizeof(bitmap),stdin);
|
||||||
|
graceFulExit(0);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
Ładowanie…
Reference in New Issue