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