89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
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#include <Arduino.h>
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#include <SPI.h>
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#include <Wire.h>
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#include "board_SSD1331.h"
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#define LCD_BOARD_ID 0 // 0 or 1 - set by the position of a resistor near SX1505 (see schematic and board design)
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// GPIO Pins
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#define GPIO_DC 0x01
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#define GPIO_CS 0x02
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#define GPIO_RES 0x08
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#define GPIO_BTN1 0x10
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#define GPIO_BTN2 0x20
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#define GPIO_BTN3 0x40
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#define GPIO_BTN4 0x80
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#define GPIO_CMD_START ~(GPIO_CS|GPIO_DC)
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#define GPIO_DATA_START ~GPIO_CS
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#define GPIO_TRANSFER_END GPIO_CS
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//GPIO Registers
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#define GPIO_RegData 0x00
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#define GPIO_RegDir 0x01
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#define GPIO_RegPullUp 0x02
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// Wire address of the SX1505 chip
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#define GPIO_ADDR 0x20
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static void writeGPIO(gU8 regAddr, gU8 regData)
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{
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gU8 oldTWBR=TWBR;
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TWBR=0;
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Wire.beginTransmission(GPIO_ADDR + LCD_BOARD_ID);
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Wire.write(regAddr);
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Wire.write(regData);
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Wire.endTransmission();
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TWBR=oldTWBR;
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}
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static bool isDataMode = false;
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static bool isCmdMode = false;
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void SSD1331_init_board(void) {
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//setup GPIO, reset SSD1331
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writeGPIO(GPIO_RegData,~GPIO_RES);//reset low, CS/other pins high
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writeGPIO(GPIO_RegDir,~GPIO_RES);//set reset to output
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delay(5);
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writeGPIO(GPIO_RegDir,~(GPIO_CS|GPIO_DC));//reset to input, CS/DC output
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writeGPIO(GPIO_RegPullUp,GPIO_BTN1|GPIO_BTN2|GPIO_BTN3|GPIO_BTN4);//button pullup enable
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//init SPI
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SPI.begin();
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SPI.setDataMode(SPI_MODE0);//wrong mode, works because we're only writing. this mode is compatible with SD cards.
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SPI.setClockDivider(SPI_CLOCK_DIV2);
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isDataMode = isCmdMode = false;
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}
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void SSD1331_setpin_reset(int state) {
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// Ignore this as we did it in the init_board
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}
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void SSD1331_aquirebus(void) {
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// Do nothing as we do it in the data transfer
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}
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void SSD1331_releasebus(void) {
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if (!isDataMode && !isCmdMode) return;
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writeGPIO(GPIO_RegData,GPIO_TRANSFER_END);
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isDataMode = isCmdMode = false;
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}
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void SSD1331_write_cmd(gU8 cmd) {
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if (!isCmdMode) {
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writeGPIO(GPIO_RegData,GPIO_CMD_START);
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isDataMode = false;
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isCmdMode = true;
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}
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SPI.transfer(cmd);
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}
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void SSD1331_write_data(gU8 data) {
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if (!isDataMode) {
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writeGPIO(GPIO_RegData,GPIO_DATA_START);
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isDataMode = true;
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isCmdMode = false;
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}
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SPI.transfer(data);
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}
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