epdif.cpp

#include "epdif.h"
#include <SPI.h>

EpdIf::EpdIf() {};
EpdIf::~EpdIf() {};

void EpdIf::DigitalWrite(int pin, int value) { digitalWrite(pin, value); }
int  EpdIf::DigitalRead(int pin) { return digitalRead(pin); }
void EpdIf::DelayMs(unsigned int delaytime) { delay(delaytime); }

void EpdIf::SpiTransfer(unsigned char data) {
    digitalWrite(CS_PIN, LOW);
    SPI.transfer(data);
    digitalWrite(CS_PIN, HIGH);
}

void EpdIf::SpiTransferBulk(unsigned char* data, int len) {
    digitalWrite(CS_PIN, LOW);
    SPI.transfer(data, len);
    digitalWrite(CS_PIN, HIGH);
}

static bool spiReady = false;

int EpdIf::IfInit(void) {
    pinMode(CS_PIN, OUTPUT);
    pinMode(RST_PIN, OUTPUT);
    pinMode(DC_PIN, OUTPUT);
    pinMode(BUSY_PIN, INPUT);
    digitalWrite(CS_PIN, HIGH);
    if (!spiReady) {
        SPI.begin(CLK_PIN, -1, DIN_PIN, -1);
        SPI.beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE0));
        spiReady = true;
    }
    return 0;
}