#pragma once
#include <Arduino.h>
#include "config.h"

// ============================================================
// Bitbang-SPI für ENC28J60 auf PC6/PC7/PC8/PC9
// ENC28J60 verwendet SPI Mode 0 (CPOL=0, CPHA=0)
// ============================================================

static inline void eth_spi_init() {
    pinMode(ETH_SCK_PIN,  OUTPUT); digitalWrite(ETH_SCK_PIN,  LOW);
    pinMode(ETH_MOSI_PIN, OUTPUT); digitalWrite(ETH_MOSI_PIN, LOW);
    pinMode(ETH_MISO_PIN, INPUT);
    pinMode(ETH_CS_PIN,   OUTPUT); digitalWrite(ETH_CS_PIN,   HIGH);
}

static inline void eth_cs_low()  { digitalWrite(ETH_CS_PIN, LOW);  }
static inline void eth_cs_high() { digitalWrite(ETH_CS_PIN, HIGH); }

static inline uint8_t eth_spi_transfer(uint8_t out) {
    uint8_t in = 0;
    for (int8_t i = 7; i >= 0; i--) {
        digitalWrite(ETH_MOSI_PIN, (out >> i) & 1);
        digitalWrite(ETH_SCK_PIN, HIGH);
        in = (in << 1) | digitalRead(ETH_MISO_PIN);
        digitalWrite(ETH_SCK_PIN, LOW);
    }
    return in;
}