LiquidCrystal with custom send functions

send_callback.ino

#define SHIFTD 5
#define SHIFTC 6
#define ENABLE 7

#include <LiquidCrystal.h>

uint8_t lcd_send(uint8_t value, uint8_t mode, uint8_t nbits) {
  uint8_t shift = value << 3;
  shift |= (mode && 1) << 1;
  shiftOut(SHIFTD, SHIFTC, MSBFIRST, shift);

  // pulse ENABLE
  digitalWrite(ENABLE, HIGH);
  delayMicroseconds(1);
  digitalWrite(ENABLE, LOW);
}

LiquidCrystal lcd(lcd_send, 4);