From ef47c771efc58ff573027bd257b3cff9ccd0b3c4 Mon Sep 17 00:00:00 2001
From: Fabian Schlenz <mail@fabianonline.de>
Date: Sun, 17 Nov 2019 14:24:01 +0100
Subject: [PATCH] You can now get and set the state of all CS pins at once.

---
 include/spi_master.h | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/include/spi_master.h b/include/spi_master.h
index 83b62c0..47c57df 100644
--- a/include/spi_master.h
+++ b/include/spi_master.h
@@ -6,6 +6,8 @@
 
 class SPIMaster {
 public:
+	static uint8_t state;
+
 	static void init() {
 		PIN_SD_CS_SETUP();
 		PIN_VS1053_XCS_SETUP();
@@ -16,28 +18,57 @@ public:
 
 	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;
 	}
-};
+};
\ No newline at end of file