esmp3/include/spi_master.h

#pragma once

#include <Arduino.h>
#include <SPI.h>
#include "config.h"

class SPIMaster {
public:
	static uint8_t state;

	static void init() {
		PIN_SD_CS_SETUP();
		PIN_VS1053_XCS_SETUP();
		PIN_VS1053_XDCS_SETUP();
		PIN_RC522_CS_SETUP();
		disable();
	}

	static void select_sd(bool enabled=true) {
		PIN_SD_CS(enabled ? LOW : HIGH);
		if (enabled) {
			state |= 1;
		} else {
			state &= ~1;
		}
		delayMicroseconds(MCP_SPI_SETTING_DELAY);
	}

	static void select_vs1053_xcs(bool enabled=true) {
		PIN_VS1053_XCS(enabled ? LOW : HIGH);
		if (enabled) {
			state |= 2;
		} else {
			state &= ~2;
		}
		delayMicroseconds(MCP_SPI_SETTING_DELAY);
	}

	static void select_vs1053_xdcs(bool enabled=true) {
		PIN_VS1053_XDCS(enabled ? LOW : HIGH);
		if (enabled) {
			state |= 4;
		} else {
			state &= ~4;
		}
		delayMicroseconds(MCP_SPI_SETTING_DELAY);
	}

	static void select_rc522(bool enabled=true) {
		PIN_RC522_CS(enabled ? LOW : HIGH);
		if (enabled) {
			state |= 8;
		} else {
			state &= ~8;
		}
		delayMicroseconds(MCP_SPI_SETTING_DELAY);
	}

	static void set_state(uint8_t s) {
		disable();
		if (s & 1) select_sd();
		if (s & 2) select_vs1053_xcs();
		if (s & 4) select_vs1053_xdcs();
		if (s & 8) select_rc522();
	}

	static void disable() {
		PIN_SD_CS(HIGH);
		PIN_VS1053_XCS(HIGH);
		PIN_VS1053_XDCS(HIGH);
		PIN_RC522_CS(HIGH);
		state = 0;
	}
};