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https://github.com/2martens/uni.git
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488 lines
13 KiB
C++
488 lines
13 KiB
C++
#include <SPI.h>
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#include <SD.h>
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// pins
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int slaveSelectPin = 10;
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int SDslaveSelectPin = 4;
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int rstPin = 6;
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int dcPin = 5;
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// constants
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int divider = 84;
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int maxBufferIndex = 504;
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// buffer
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char screenBuffer[504];
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// ASCII data
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unsigned char font[95][6] =
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{
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // space
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{ 0x00, 0x00, 0x5F, 0x00, 0x00, 0x00 }, // !
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{ 0x00, 0x07, 0x00, 0x07, 0x00, 0x00 }, // "
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{ 0x14, 0x7F, 0x14, 0x7F, 0x14, 0x00 }, // #
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{ 0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x00 }, // $
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{ 0x23, 0x13, 0x08, 0x64, 0x62, 0x00 }, // %
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{ 0x36, 0x49, 0x55, 0x22, 0x50, 0x00 }, // &
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{ 0x00, 0x00, 0x07, 0x00, 0x00, 0x00 }, // '
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{ 0x00, 0x1C, 0x22, 0x41, 0x00, 0x00 }, // (
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{ 0x00, 0x41, 0x22, 0x1C, 0x00, 0x00 }, // )
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{ 0x0A, 0x04, 0x1F, 0x04, 0x0A, 0x00 }, // *
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{ 0x08, 0x08, 0x3E, 0x08, 0x08, 0x00 }, // +
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{ 0x00, 0x50, 0x30, 0x00, 0x00, 0x00 }, // ,
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{ 0x08, 0x08, 0x08, 0x08, 0x08, 0x00 }, // -
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{ 0x00, 0x60, 0x60, 0x00, 0x00, 0x00 }, // .
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{ 0x20, 0x10, 0x08, 0x04, 0x02, 0x00 }, // slash
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{ 0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00 }, // 0
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{ 0x00, 0x42, 0x7F, 0x40, 0x00, 0x00 }, // 1
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{ 0x42, 0x61, 0x51, 0x49, 0x46, 0x00 }, // 2
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{ 0x21, 0x41, 0x45, 0x4B, 0x31, 0x00 }, // 3
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{ 0x18, 0x14, 0x12, 0x7F, 0x10, 0x00 }, // 4
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{ 0x27, 0x45, 0x45, 0x45, 0x39, 0x00 }, // 5
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{ 0x3C, 0x4A, 0x49, 0x49, 0x30, 0x00 }, // 6
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{ 0x03, 0x71, 0x09, 0x05, 0x03, 0x00 }, // 7
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{ 0x36, 0x49, 0x49, 0x49, 0x36, 0x00 }, // 8
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{ 0x06, 0x49, 0x49, 0x29, 0x1E, 0x00 }, // 9
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{ 0x00, 0x36, 0x36, 0x00, 0x00, 0x00 }, // :
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{ 0x00, 0x56, 0x36, 0x00, 0x00, 0x00 }, // ;
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{ 0x08, 0x14, 0x22, 0x41, 0x00, 0x00 }, // <
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{ 0x14, 0x14, 0x14, 0x14, 0x14, 0x00 }, // =
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{ 0x00, 0x41, 0x22, 0x14, 0x08, 0x00 }, // >
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{ 0x02, 0x01, 0x51, 0x09, 0x06, 0x00 }, // ?
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{ 0x32, 0x49, 0x79, 0x41, 0x3E, 0x00 }, // @
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{ 0x7E, 0x11, 0x11, 0x11, 0x7E, 0x00 }, // A
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{ 0x7F, 0x49, 0x49, 0x49, 0x36, 0x00 }, // B
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{ 0x3E, 0x41, 0x41, 0x41, 0x22, 0x00 }, // C
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{ 0x7F, 0x41, 0x41, 0x41, 0x3E, 0x00 }, // D
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{ 0x7F, 0x49, 0x49, 0x49, 0x41, 0x00 }, // E
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{ 0x7F, 0x09, 0x09, 0x09, 0x01, 0x00 }, // F
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{ 0x3E, 0x41, 0x41, 0x49, 0x7A, 0x00 }, // G
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{ 0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00 }, // H
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{ 0x00, 0x41, 0x7F, 0x41, 0x00, 0x00 }, // I
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{ 0x20, 0x40, 0x41, 0x3F, 0x01, 0x00 }, // J
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{ 0x7F, 0x08, 0x14, 0x22, 0x41, 0x00 }, // K
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{ 0x7F, 0x40, 0x40, 0x40, 0x40, 0x00 }, // L
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{ 0x7F, 0x02, 0x0C, 0x02, 0x7F, 0x00 }, // M
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{ 0x7F, 0x04, 0x08, 0x10, 0x7F, 0x00 }, // N
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{ 0x3E, 0x41, 0x41, 0x41, 0x3E, 0x00 }, // O
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{ 0x7F, 0x09, 0x09, 0x09, 0x06, 0x00 }, // P
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{ 0x3E, 0x41, 0x51, 0x21, 0x5E, 0x00 }, // Q
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{ 0x7F, 0x09, 0x19, 0x29, 0x46, 0x00 }, // R
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{ 0x26, 0x49, 0x49, 0x49, 0x32, 0x00 }, // S
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{ 0x01, 0x01, 0x7F, 0x01, 0x01, 0x00 }, // T
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{ 0x3F, 0x40, 0x40, 0x40, 0x3F, 0x00 }, // U
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{ 0x1F, 0x20, 0x40, 0x20, 0x1F, 0x00 }, // V
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{ 0x3F, 0x40, 0x38, 0x40, 0x3F, 0x00 }, // W
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{ 0x63, 0x14, 0x08, 0x14, 0x63, 0x00 }, // X
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{ 0x07, 0x08, 0x70, 0x08, 0x07, 0x00 }, // Y
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{ 0x61, 0x51, 0x49, 0x45, 0x43, 0x00 }, // Z
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{ 0x00, 0x7F, 0x41, 0x41, 0x00, 0x00 }, // [
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{ 0x02, 0x04, 0x08, 0x10, 0x20, 0x00 }, // backslash
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{ 0x00, 0x41, 0x41, 0x7F, 0x00, 0x00 }, // ]
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{ 0x04, 0x02, 0x01, 0x02, 0x04, 0x00 }, // ^
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{ 0x40, 0x40, 0x40, 0x40, 0x40, 0x00 }, // _
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{ 0x00, 0x01, 0x02, 0x04, 0x00, 0x00 }, // `
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{ 0x20, 0x54, 0x54, 0x54, 0x78, 0x00 }, // a
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{ 0x7F, 0x48, 0x44, 0x44, 0x38, 0x00 }, // b
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{ 0x38, 0x44, 0x44, 0x44, 0x20, 0x00 }, // c
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{ 0x38, 0x44, 0x44, 0x48, 0x7F, 0x00 }, // d
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{ 0x38, 0x54, 0x54, 0x54, 0x18, 0x00 }, // e
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{ 0x08, 0x7E, 0x09, 0x01, 0x02, 0x00 }, // f
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{ 0x08, 0x54, 0x54, 0x54, 0x3C, 0x00 }, // g
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{ 0x7F, 0x08, 0x04, 0x04, 0x78, 0x00 }, // h
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{ 0x00, 0x48, 0x7D, 0x40, 0x00, 0x00 }, // i
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{ 0x20, 0x40, 0x44, 0x3D, 0x00, 0x00 }, // j
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{ 0x7F, 0x10, 0x28, 0x44, 0x00, 0x00 }, // k
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{ 0x00, 0x41, 0x7F, 0x40, 0x00, 0x00 }, // l
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{ 0x7C, 0x04, 0x78, 0x04, 0x78, 0x00 }, // m
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{ 0x7C, 0x08, 0x04, 0x04, 0x78, 0x00 }, // n
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{ 0x38, 0x44, 0x44, 0x44, 0x38, 0x00 }, // o
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{ 0x7C, 0x14, 0x14, 0x14, 0x08, 0x00 }, // p
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{ 0x08, 0x14, 0x14, 0x18, 0x7C, 0x00 }, // q
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{ 0x7C, 0x08, 0x04, 0x04, 0x08, 0x00 }, // r
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{ 0x48, 0x54, 0x54, 0x54, 0x20, 0x00 }, // s
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{ 0x04, 0x3F, 0x44, 0x40, 0x20, 0x00 }, // t
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{ 0x3C, 0x40, 0x40, 0x20, 0x7C, 0x00 }, // u
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{ 0x1C, 0x20, 0x40, 0x20, 0x1C, 0x00 }, // v
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{ 0x3C, 0x40, 0x30, 0x40, 0x3C, 0x00 }, // w
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{ 0x44, 0x28, 0x10, 0x28, 0x44, 0x00 }, // x
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{ 0x0C, 0x50, 0x50, 0x50, 0x3C, 0x00 }, // y
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{ 0x44, 0x64, 0x54, 0x4C, 0x44, 0x00 }, // z
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{ 0x00, 0x08, 0x36, 0x41, 0x00, 0x00 }, // {
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{ 0x00, 0x00, 0x7F, 0x00, 0x00, 0x00 }, // |
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{ 0x00, 0x41, 0x36, 0x08, 0x00, 0x00 }, // }
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{ 0x10, 0x08, 0x08, 0x10, 0x08, 0x00 } // ~
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};
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// tmp vars
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int readStringLength = 0;
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void setup()
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{
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Serial.begin(9600);
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// initialize SPI
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SPI.begin(slaveSelectPin);
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SPI.setClockDivider(slaveSelectPin, divider);
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// initialize SD
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SD.begin(SDslaveSelectPin);
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// initialize pins
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pinMode(dcPin, OUTPUT);
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pinMode(rstPin, OUTPUT);
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// initial reset of display
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resetDisplay();
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// initialization of display
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digitalWrite(dcPin, LOW);
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SPI.transfer(slaveSelectPin, 0x21);
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SPI.transfer(slaveSelectPin, 0x14);
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SPI.transfer(slaveSelectPin, 0xb0);
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SPI.transfer(slaveSelectPin, 0x20);
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SPI.transfer(slaveSelectPin, 0x0c);
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digitalWrite(dcPin, HIGH);
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// initialize screen buffer
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resetBuffer();
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}
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/**
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* Loop function for main code
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*/
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void loop()
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{
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if (Serial.available() > 0) {
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String command = Serial.readString();
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resetBuffer();
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handleCommand(command);
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flushBuffer();
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delay(500);
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}
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}
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/**
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* Resets display.
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*/
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void resetDisplay()
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{
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digitalWrite(rstPin, LOW);
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delay(500);
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digitalWrite(rstPin, HIGH);
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}
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/**
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* Writes the screen buffer into the display.
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*
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* It does NOT reset the buffer.
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*/
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void flushBuffer()
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{
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for (int i = 0; i < maxBufferIndex; i++) {
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SPI.transfer(slaveSelectPin, screenBuffer[i]);
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}
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}
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/**
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* Resets the buffer.
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*
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* Writes 0 in all fields.
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*/
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void resetBuffer()
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{
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for (int i = 0; i < maxBufferIndex; i++) {
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screenBuffer[i] = 0x0;
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}
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}
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/**
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* Sets the pixel at the given location.
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* @param x
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* @param y
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* @param value
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*/
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void setPixel(int x, int y, int value)
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{
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int bank = x / 8;
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int relativeRow = x - bank * 8;
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int bankStartIndex = bank * 84;
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int index = bankStartIndex + y;
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char bitValue = 0x0;
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if (value == 1) {
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bitValue = 0xff;
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}
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char existingValue = screenBuffer[index];
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char pixelMask = 1 << relativeRow;
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char invMask = ~ pixelMask;
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char newValue = pixelMask & bitValue;
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char finalExistingValue = existingValue & invMask;
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char finalValue = finalExistingValue | newValue;
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screenBuffer[index] = finalValue;
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}
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/**
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* Prints given char at given location.
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*
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* @param x
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* @param y
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* @param value
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*
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* @return 0 on success, -1 otherwise
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*/
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int printChar(int x, int y, char value)
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{
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// guardians
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if (x > 40 || y > 78) {
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// absolute guardian
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return -1;
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}
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// TODO relative guardian to existing buffer
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char space = ' ';
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int arrayIndex = value - space;
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for (int i = 0; i < 6; i++) {
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char data = font[arrayIndex][i];
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for (int _x = 0; _x < 8; _x++) {
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char bitmask = 1 << _x;
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char pixel = bitmask & data;
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int pixelInt = 0;
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if (pixel != 0x0) {
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pixelInt = 1;
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}
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setPixel(x + _x, y + i, pixelInt);
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}
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}
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return 0;
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}
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/**
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* Prints a string.
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*
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* @param int x
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* @param int y
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* @param char* text
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* @param int textLength
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*/
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int printString(int x, int y, const char* text, int textLength)
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{
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// guardians
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if (x > 40 || y > 78) {
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// absolute guardian
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return -1;
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}
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int actualY = y;
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int actualX = x;
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bool writeError = false;
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for (int i = 0; i < textLength; i++) {
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char character = text[i];
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int result = 0;
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// write dash
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if ((actualY + 6) > 72) {
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printChar(actualX, actualY, '-');
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actualX += 10;
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actualY = y;
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result = printChar(actualX, actualY, character);
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}
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else {
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result = printChar(actualX, actualY, character);
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}
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actualY += 6;
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if (result != 0) {
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// the character would be out of the display x bounds
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writeError = true;
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break;
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}
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}
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if (writeError) {
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return 0;
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resetBuffer();
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printString(3, 20, "Too long", 8);
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}
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return 0;
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}
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/**
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* Prints an image with given parameters.
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*
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* @param int x
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* @param int y
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* @param int rows
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* @param int cols
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* @param const int* pixels
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*/
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void printImage(int x, int y, int rows, int cols, const int* pixels)
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{
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int currentX = x;
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int currentY = y;
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int maxIndex = rows * cols;
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for (int i = 0; i < maxIndex; i++) {
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if (currentY == (y + cols)) {
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currentX++;
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currentY = y;
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}
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int pixel = pixels[i];
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setPixel(currentX, currentY, pixel);
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currentY++;
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}
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}
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/**
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* Reads the contents of a text file into a string.
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*
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* @param File file
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* @param char* text
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*/
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void readString(File file, char* text, unsigned long fileSize)
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{
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if (file) {
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int readBytes = file.readBytesUntil('\n', text, fileSize);
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text[readBytes] = '\0';
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readStringLength = readBytes;
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}
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}
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/**
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* Explodes the string into an integer array.
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*
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* @param const int* input
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* @param int length
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* @param char delimeter
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* @param int* result
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*/
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void explodeString(const char* input, int length, char delimeter, int* result)
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{
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char tmp[length];
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int nthChar = 0;
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int nthInt = 0;
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for (int i = 0; i < length; i++) {
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char currentChar = input[i];
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if (currentChar != delimeter) {
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tmp[nthChar] = currentChar;
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nthChar++;
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}
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else {
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char *end;
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tmp[nthChar] = '\0';
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result[nthInt] = (int) strtol(tmp, &end, 10);
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nthChar = 0;
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memset(&tmp[0], 0, length);
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nthInt++;
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}
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}
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char *end;
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tmp[nthChar] = '\0';
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result[nthInt] = (int) strtol(tmp, &end, 10);
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nthChar = 0;
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memset(&tmp[0], 0, length);
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nthInt++;
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}
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/**
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* Handles the command.
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*
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* @param String command
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*/
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void handleCommand(String command)
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{
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String existCommand = "doesFileExist";
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String showCommand = "showFile";
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// determine command and parameter
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int indexP1 = command.indexOf('(');
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int indexP2 = command.indexOf(')');
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String command2 = command;
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command2.remove(indexP1);
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if (command2 != existCommand && command2 != showCommand) {
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Serial.println("Use doesFileExist(<file>) or showFile(<file>)");
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return;
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}
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command.remove(indexP2);
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String parameter = command.substring(indexP1 + 1);
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char paramChar[parameter.length() + 1];
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parameter.toCharArray(paramChar, parameter.length() + 1);
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paramChar[parameter.length()] = '\0';
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if (command2 == existCommand) {
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bool fileExists = SD.exists(paramChar);
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Serial.print("Does file exist? ");
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Serial.println(fileExists ? "Yes" : "No");
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}
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if (command2 == showCommand) {
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showFile(parameter);
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}
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}
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/**
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* Shows the given file.
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*
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* @param String fileName
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*/
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void showFile(String fileName)
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{
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bool isTextFile = false;
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int extPos = fileName.indexOf('.');
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String ext = fileName.substring(extPos + 1);
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isTextFile = (ext == "txt");
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char fileNameChar[fileName.length() + 1];
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fileName.toCharArray(fileNameChar, fileName.length() + 1);
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fileNameChar[fileName.length()] = '\0';
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if (SD.exists(fileNameChar)) {
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File file = SD.open(fileNameChar);
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unsigned long fileSize = file.size();
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if (isTextFile) {
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char text[fileSize];
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readString(file, text, fileSize);
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Serial.println(text);
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printString(0, 0, text, readStringLength);
|
|
}
|
|
else {
|
|
char dimensions[fileSize];
|
|
readString(file, dimensions, fileSize);
|
|
int dimensionsLength = readStringLength;
|
|
char pixels[fileSize];
|
|
readString(file, pixels, fileSize);
|
|
int pixelsLength = readStringLength;
|
|
|
|
// parse dimensions and pixels
|
|
int dimensionsInt[2];
|
|
explodeString(dimensions, dimensionsLength, ',', dimensionsInt);
|
|
int pixelsInt[pixelsLength];
|
|
explodeString(pixels, pixelsLength, ',', pixelsInt);
|
|
// calculate x and y start positions
|
|
int rows = dimensionsInt[0];
|
|
int cols = dimensionsInt[1];
|
|
int x = (48 - rows) / 2;
|
|
int y = (84 - cols) / 2;
|
|
|
|
Serial.println(x);
|
|
Serial.println(y);
|
|
Serial.println(rows);
|
|
Serial.println(cols);
|
|
|
|
printImage(x, y, rows, cols, pixelsInt);
|
|
}
|
|
|
|
file.close();
|
|
}
|
|
}
|