firmware/src/detect/einkScan.h

#include "../configuration.h"

#ifdef RAK4630
#include "../main.h"
#include <SPI.h>

void d_writeCommand(uint8_t c)
{
  SPI1.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
  if (PIN_EINK_DC >= 0) digitalWrite(PIN_EINK_DC, LOW);
  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, LOW);
  SPI1.transfer(c);
  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, HIGH);
  if (PIN_EINK_DC >= 0) digitalWrite(PIN_EINK_DC, HIGH);
  SPI1.endTransaction();
}

void d_writeData(uint8_t d)
{
  SPI1.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, LOW);
  SPI1.transfer(d);
  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, HIGH);
  SPI1.endTransaction();
}

unsigned long d_waitWhileBusy(uint16_t busy_time)
{
  if (PIN_EINK_BUSY >= 0)
  {
    delay(1); // add some margin to become active
    unsigned long start = micros();
    while (1)
    {
      if (digitalRead(PIN_EINK_BUSY) != HIGH) break;
      delay(1);
      if (digitalRead(PIN_EINK_BUSY) != HIGH) break;
      if (micros() - start > 10000000) break;
    }
    unsigned long elapsed = micros() - start;
    (void) start;
    return elapsed;
  }
  else return busy_time;
}

void scanEInkDevice(void)
{
    SPI1.begin();
    d_writeCommand(0x22);
    d_writeData(0x83);
    d_writeCommand(0x20);
    eink_found = (d_waitWhileBusy(150) > 0) ? true : false;
    if(eink_found)
      LOG_DEBUG("EInk display found\n");
    else
      LOG_DEBUG("EInk display not found\n");
    SPI1.end();
}
#endif