Fix issue with CDC device demos causing broken communications when the device tries...

[pub/USBasp.git] / LUFA / Drivers / Peripheral / SPI.h

diff --git a/LUFA/Drivers/Peripheral/SPI.h b/LUFA/Drivers/Peripheral/SPI.h
index 4ada793..6048d86 100644 (file)
--- a/LUFA/Drivers/Peripheral/SPI.h
+++ b/LUFA/Drivers/Peripheral/SPI.h
@@ -33,10 +33,16 @@
  *  Hardware SPI subsystem driver for the supported USB AVRs models.\r
  */\r
 \r
-/** \ingroup Group_SubsystemDrivers\r
+/** \ingroup Group_PeripheralDrivers\r
  *  @defgroup Group_SPI SPI Driver - LUFA/Drivers/Peripheral/SPI.h\r
  *\r
- *  Functions, macros, variables, enums and types related to the setup of a the SPI port.\r
+ *  \section Sec_Dependencies Module Source Dependencies\r
+ *  The following files must be built with any user project that uses this module:\r
+ *    - None\r
+ *\r
+ *  \section Module Description\r
+ *  Driver for the hardware SPI port avaliable on most AVR models. This module provides\r
+ *  an easy to use driver for the setup of and transfer of data over the AVR's SPI port.\r
  *\r
  *  @{\r
  */\r
@@ -85,8 +91,8 @@
                        /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other\r
                         *  SPI routines.\r
                         *\r
-                        *  \param PrescalerMask  Prescaler mask to set the SPI clock speed\r
-                        *  \param Master         If true, sets the SPI system to use master mode, slave if false\r
+                        *  \param[in] PrescalerMask  Prescaler mask to set the SPI clock speed\r
+                        *  \param[in] Master         If true, sets the SPI system to use master mode, slave if false\r
                         */\r
                        static inline void SPI_Init(const uint8_t PrescalerMask, const bool Master)\r
                        {\r
@@ -97,12 +103,14 @@
                                          (PrescalerMask & ~SPI_USE_DOUBLESPEED));\r
                                \r
                                if (PrescalerMask & SPI_USE_DOUBLESPEED)\r
-                                 SPSR = (1 << SPI2X);\r
+                                 SPSR |= (1 << SPI2X);\r
+                               else\r
+                                 SPSR &= ~(1 << SPI2X);\r
                        }\r
                        \r
                        /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.\r
                         *\r
-                        *  \param Byte  Byte to send through the SPI interface\r
+                        *  \param[in] Byte  Byte to send through the SPI interface\r
                         *\r
                         *  \return Response byte from the attached SPI device\r
                         */\r
@@ -117,7 +125,7 @@
                        /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response\r
                         *  byte sent to from the attached SPI device is ignored.\r
                         *\r
-                        *  \param Byte Byte to send through the SPI interface\r
+                        *  \param[in] Byte Byte to send through the SPI interface\r
                         */\r
                        static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;\r
                        static inline void SPI_SendByte(const uint8_t Byte)\r