Use new Arduino SPI library

See: arduino/Arduino#2223

Author: Lauszus

settings.h

@@ -137,8 +137,8 @@ e-mail   :  support@circuitsathome.com
 #define USING_SPI4TEENSY3 0
 #endif
 
-#if defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
-#include <SPI.h> // Use the Arduino SPI library for the Arduino Due
+#if (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) || ARDUINO >= 158
+#include <SPI.h> // Use the Arduino SPI library for the Arduino Due or if the SPI library with transaction is available
 #endif
 
-#endif	/* SETTINGS_H */
+#endif  /* SETTINGS_H */

usbhost.h

@@ -30,7 +30,11 @@ e-mail   :  support@circuitsathome.com
 /* SPI initialization */
 template< typename SPI_CLK, typename SPI_MOSI, typename SPI_MISO, typename SPI_SS > class SPi {
 public:
-#if USING_SPI4TEENSY3
+#if SPI_HAS_TRANSACTION
+        static void init() {
+                SPI.begin(); // The SPI library with transaction will take care of setting up the pins - settings is set in beginTransaction()
+        }
+#elif USING_SPI4TEENSY3
         static void init() {
                 // spi4teensy3 inits everything for us, except /SS
                 // CLK, MOSI and MISO are hard coded for now.
@@ -129,8 +133,17 @@ MAX3421e< SPI_SS, INTR >::MAX3421e() {
 template< typename SPI_SS, typename INTR >
 void MAX3421e< SPI_SS, INTR >::regWr(uint8_t reg, uint8_t data) {
         XMEM_ACQUIRE_SPI();
+#if SPI_HAS_TRANSACTION
+        SPI.beginTransaction(SPISettings(26000000, MSBFIRST, SPI_MODE0)); // The MAX3421E can handle up to 26MHz, use MSB First and SPI mode 0
+#endif
         SPI_SS::Clear();
-#if USING_SPI4TEENSY3
+
+#if SPI_HAS_TRANSACTION
+        uint8_t c[2];
+        c[0] = reg | 0x02;
+        c[1] = data;
+        SPI.transfer(c, 2);
+#elif USING_SPI4TEENSY3
         uint8_t c[2];
         c[0] = reg | 0x02;
         c[1] = data;
@@ -144,7 +157,11 @@ void MAX3421e< SPI_SS, INTR >::regWr(uint8_t reg, uint8_t data) {
         SPDR = data;
         while(!(SPSR & (1 << SPIF)));
 #endif
+
         SPI_SS::Set();
+#if SPI_HAS_TRANSACTION
+        SPI.endTransaction();
+#endif
         XMEM_RELEASE_SPI();
         return;
 };
@@ -154,8 +171,16 @@ void MAX3421e< SPI_SS, INTR >::regWr(uint8_t reg, uint8_t data) {
 template< typename SPI_SS, typename INTR >
 uint8_t* MAX3421e< SPI_SS, INTR >::bytesWr(uint8_t reg, uint8_t nbytes, uint8_t* data_p) {
         XMEM_ACQUIRE_SPI();
+#if SPI_HAS_TRANSACTION
+        SPI.beginTransaction(SPISettings(26000000, MSBFIRST, SPI_MODE0)); // The MAX3421E can handle up to 26MHz, use MSB First and SPI mode 0
+#endif
         SPI_SS::Clear();
-#if USING_SPI4TEENSY3
+
+#if SPI_HAS_TRANSACTION
+        SPI.transfer(reg | 0x02);
+        SPI.transfer(data_p, nbytes);
+        data_p += nbytes;
+#elif USING_SPI4TEENSY3
         spi4teensy3::send(reg | 0x02);
         spi4teensy3::send(data_p, nbytes);
         data_p += nbytes;
@@ -176,7 +201,11 @@ uint8_t* MAX3421e< SPI_SS, INTR >::bytesWr(uint8_t reg, uint8_t nbytes, uint8_t*
         }
         while(!(SPSR & (1 << SPIF)));
 #endif
+
         SPI_SS::Set();
+#if SPI_HAS_TRANSACTION
+        SPI.endTransaction();
+#endif
         XMEM_RELEASE_SPI();
         return ( data_p);
 }
@@ -196,23 +225,31 @@ void MAX3421e< SPI_SS, INTR >::gpioWr(uint8_t data) {
 template< typename SPI_SS, typename INTR >
 uint8_t MAX3421e< SPI_SS, INTR >::regRd(uint8_t reg) {
         XMEM_ACQUIRE_SPI();
+#if SPI_HAS_TRANSACTION
+        SPI.beginTransaction(SPISettings(26000000, MSBFIRST, SPI_MODE0)); // The MAX3421E can handle up to 26MHz, use MSB First and SPI mode 0
+#endif
         SPI_SS::Clear();
-#if USING_SPI4TEENSY3
-        spi4teensy3::send(reg);
-        uint8_t rv = spi4teensy3::receive();
-        SPI_SS::Set();
-#elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+
+#if (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) || SPI_HAS_TRANSACTION
         SPI.transfer(reg);
-        uint8_t rv = SPI.transfer(0);
+        uint8_t rv = SPI.transfer(0); // Send empty byte
+        SPI_SS::Set();
+#elif USING_SPI4TEENSY3
+        spi4teensy3::send(reg);
+        uint8_t rv = spi4teensy3::receive(); // Send empty byte
         SPI_SS::Set();
 #else
         SPDR = reg;
         while(!(SPSR & (1 << SPIF)));
-        SPDR = 0; //send empty byte
+        SPDR = 0; // Send empty byte
         while(!(SPSR & (1 << SPIF)));
         SPI_SS::Set();
         uint8_t rv = SPDR;
 #endif
+
+#if SPI_HAS_TRANSACTION
+        SPI.endTransaction();
+#endif
         XMEM_RELEASE_SPI();
         return (rv);
 }
@@ -222,8 +259,16 @@ uint8_t MAX3421e< SPI_SS, INTR >::regRd(uint8_t reg) {
 template< typename SPI_SS, typename INTR >
 uint8_t* MAX3421e< SPI_SS, INTR >::bytesRd(uint8_t reg, uint8_t nbytes, uint8_t* data_p) {
         XMEM_ACQUIRE_SPI();
+#if SPI_HAS_TRANSACTION
+        SPI.beginTransaction(SPISettings(26000000, MSBFIRST, SPI_MODE0)); // The MAX3421E can handle up to 26MHz, use MSB First and SPI mode 0
+#endif
         SPI_SS::Clear();
-#if USING_SPI4TEENSY3
+
+#if SPI_HAS_TRANSACTION
+        SPI.transfer(reg);
+        SPI.transfer(data_p, nbytes);
+        data_p += nbytes;
+#elif USING_SPI4TEENSY3
         spi4teensy3::send(reg);
         spi4teensy3::receive(data_p, nbytes);
         data_p += nbytes;
@@ -253,7 +298,11 @@ uint8_t* MAX3421e< SPI_SS, INTR >::bytesRd(uint8_t reg, uint8_t nbytes, uint8_t*
         }
 #endif
 #endif
+
         SPI_SS::Set();
+#if SPI_HAS_TRANSACTION
+        SPI.endTransaction();
+#endif
         XMEM_RELEASE_SPI();
         return ( data_p);
 }
@@ -439,7 +488,7 @@ uint8_t MAX3421e< SPI_SS, INTR >::IntHandler() {
 //template< typename SPI_SS, typename INTR >
 //uint8_t MAX3421e< SPI_SS, INTR >::GpxHandler()
 //{
-//	uint8_t GPINIRQ = regRd( rGPINIRQ );          //read GPIN IRQ register
+//    uint8_t GPINIRQ = regRd( rGPINIRQ );          //read GPIN IRQ register
 ////    if( GPINIRQ & bmGPINIRQ7 ) {            //vbus overload
 ////        vbusPwr( OFF );                     //attempt powercycle
 ////        delay( 1000 );