Add notUsingInterrupt()

SPI.cpp

 
 	if (n >= NVIC_NUM_INTERRUPTS) return;
 
-	Serial.print("usingInterrupt ");
-	Serial.println(n);
+	//Serial.print("usingInterrupt ");
+	//Serial.println(n);
 	interruptMasksUsed |= (1 << (n >> 5));
 	interruptMask[n >> 5] |= (1 << (n & 0x1F));
-	Serial.printf("interruptMasksUsed = %d\n", interruptMasksUsed);
-	Serial.printf("interruptMask[0] = %08X\n", interruptMask[0]);
-	Serial.printf("interruptMask[1] = %08X\n", interruptMask[1]);
-	Serial.printf("interruptMask[2] = %08X\n", interruptMask[2]);
+	//Serial.printf("interruptMasksUsed = %d\n", interruptMasksUsed);
+	//Serial.printf("interruptMask[0] = %08X\n", interruptMask[0]);
+	//Serial.printf("interruptMask[1] = %08X\n", interruptMask[1]);
+	//Serial.printf("interruptMask[2] = %08X\n", interruptMask[2]);
+}
+
+void SPIClass::notUsingInterrupt(IRQ_NUMBER_t interruptName)
+{
+	uint32_t n = (uint32_t)interruptName;
+	if (n >= NVIC_NUM_INTERRUPTS) return;
+	interruptMask[n >> 5] &= ~(1 << (n & 0x1F));
+	if (interruptMask[n >> 5] == 0) {
+		interruptMasksUsed &= ~(1 << (n >> 5));
+	}
 }
 
 const uint16_t SPISettings::ctar_div_table[23] = {

SPI.h

 
 #elif defined(__arm__) && defined(TEENSYDUINO)
 
+#define SPI_HAS_NOTUSINGINTERRUPT 1
+
 class SPISettings {
 public:
 	SPISettings(uint32_t clock, uint8_t bitOrder, uint8_t dataMode) {
 		}
 	}
 	static void usingInterrupt(IRQ_NUMBER_t interruptName);
+	static void notUsingInterrupt(IRQ_NUMBER_t interruptName);
 
 	// Before using SPI.transfer() or asserting chip select pins,
 	// this function is used to gain exclusive access to the SPI bus