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@ -53,17 +53,17 @@
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* \code
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* \code
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* // Initialize the Master SPI mode USART driver before first use, with 1Mbit baud
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* // Initialize the Master SPI mode USART driver before first use, with 1Mbit baud
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* SerialSPI_Init(&USARTD0, (USART_SPI_SCK_LEAD_RISING | USART_SPI_SAMPLE_LEADING | USART_SPI_ORDER_MSB_FIRST), 1000000);
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* SerialSPI_Init(&USARTD0, (USART_SPI_SCK_LEAD_RISING | USART_SPI_SAMPLE_LEADING | USART_SPI_ORDER_MSB_FIRST), 1000000);
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*
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*
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* // Send several bytes, ignoring the returned data
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* // Send several bytes, ignoring the returned data
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* SerialSPI_SendByte(&USARTD0, 0x01);
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* SerialSPI_SendByte(&USARTD0, 0x01);
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* SerialSPI_SendByte(&USARTD0, 0x02);
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* SerialSPI_SendByte(&USARTD0, 0x02);
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* SerialSPI_SendByte(&USARTD0, 0x03);
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* SerialSPI_SendByte(&USARTD0, 0x03);
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*
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*
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* // Receive several bytes, sending a dummy 0x00 byte each time
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* // Receive several bytes, sending a dummy 0x00 byte each time
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* uint8_t Byte1 = SerialSPI_ReceiveByte(&USARTD);
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* uint8_t Byte1 = SerialSPI_ReceiveByte(&USARTD);
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* uint8_t Byte2 = SerialSPI_ReceiveByte(&USARTD);
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* uint8_t Byte2 = SerialSPI_ReceiveByte(&USARTD);
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* uint8_t Byte3 = SerialSPI_ReceiveByte(&USARTD);
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* uint8_t Byte3 = SerialSPI_ReceiveByte(&USARTD);
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*
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*
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* // Send a byte, and store the received byte from the same transaction
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* // Send a byte, and store the received byte from the same transaction
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* uint8_t ResponseByte = SerialSPI_TransferByte(&USARTD0, 0xDC);
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* uint8_t ResponseByte = SerialSPI_TransferByte(&USARTD0, 0xDC);
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* \endcode
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* \endcode
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@ -118,40 +118,44 @@
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/** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out LSB first. */
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/** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out LSB first. */
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#define USART_SPI_ORDER_LSB_FIRST USART_UDORD_bm
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#define USART_SPI_ORDER_LSB_FIRST USART_UDORD_bm
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//@}
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//@}
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/* Inline Functions: */
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/* Inline Functions: */
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/** Initialize the USART module in Master SPI mode.
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/** Initialize the USART module in Master SPI mode.
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*
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*
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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* \param[in] SPIOptions USART SPI Options, a mask consisting of one of each of the \c USART_SPI_SCK_*,
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* \param[in] SPIOptions USART SPI Options, a mask consisting of one of each of the \c USART_SPI_SCK_*,
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* \c USART_SPI_SAMPLE_* and \c USART_SPI_ORDER_* masks.
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* \c USART_SPI_SAMPLE_* and \c USART_SPI_ORDER_* masks.
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* \param[in] BaudRate SPI baud rate, in bits per second.
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* \param[in] BaudRate SPI baud rate, in bits per second.
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*/
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*/
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static inline void SerialSPI_Init(USART_t* const USART,
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const uint8_t SPIOptions,
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const uint32_t BaudRate) ATTR_NON_NULL_PTR_ARG(1);
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static inline void SerialSPI_Init(USART_t* const USART,
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static inline void SerialSPI_Init(USART_t* const USART,
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const uint8_t SPIOptions,
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const uint8_t SPIOptions,
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const uint32_t BaudRate)
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const uint32_t BaudRate)
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{
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{
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uint16_t BaudValue = SERIAL_SPI_UBBRVAL(BaudRate);
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uint16_t BaudValue = SERIAL_SPI_UBBRVAL(BaudRate);
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USART->BAUDCTRLB = (BaudValue >> 8);
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USART->BAUDCTRLB = (BaudValue >> 8);
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USART->BAUDCTRLA = (BaudValue & 0xFF);
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USART->BAUDCTRLA = (BaudValue & 0xFF);
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USART->CTRLC = (USART_CMODE_MSPI_gc | SPIOptions);
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USART->CTRLC = (USART_CMODE_MSPI_gc | SPIOptions);
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USART->CTRLB = (USART_RXEN_bm | USART_TXEN_bm);
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USART->CTRLB = (USART_RXEN_bm | USART_TXEN_bm);
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}
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}
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/** Turns off the USART driver, disabling and returning used hardware to their default configuration.
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/** Turns off the USART driver, disabling and returning used hardware to their default configuration.
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*
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*
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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*/
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*/
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static inline void SerialSPI_Disable(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1);
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static inline void SerialSPI_Disable(USART_t* const USART)
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static inline void SerialSPI_Disable(USART_t* const USART)
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{
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{
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USART->CTRLA = 0;
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USART->CTRLA = 0;
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USART->CTRLB = 0;
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USART->CTRLB = 0;
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USART->CTRLC = 0;
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USART->CTRLC = 0;
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}
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}
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/** Sends and receives a byte through the USART SPI interface, blocking until the transfer is complete.
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/** Sends and receives a byte through the USART SPI interface, blocking until the transfer is complete.
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*
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*
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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@ -159,6 +163,8 @@
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*
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*
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* \return Response byte from the attached SPI device.
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* \return Response byte from the attached SPI device.
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*/
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*/
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static inline uint8_t SerialSPI_TransferByte(USART_t* const USART,
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const uint8_t DataByte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1);
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static inline uint8_t SerialSPI_TransferByte(USART_t* const USART,
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static inline uint8_t SerialSPI_TransferByte(USART_t* const USART,
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const uint8_t DataByte)
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const uint8_t DataByte)
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{
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{
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@ -174,6 +180,8 @@
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
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* \param[in] DataByte Byte to send through the USART SPI interface.
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* \param[in] DataByte Byte to send through the USART SPI interface.
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*/
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*/
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static inline void SerialSPI_SendByte(USART_t* const USART,
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const uint8_t DataByte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1)
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static inline void SerialSPI_SendByte(USART_t* const USART,
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static inline void SerialSPI_SendByte(USART_t* const USART,
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const uint8_t DataByte)
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const uint8_t DataByte)
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{
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{
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@ -187,11 +195,12 @@
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*
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*
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* \return The response byte from the attached SPI device.
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* \return The response byte from the attached SPI device.
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*/
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*/
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static inline uint8_t SerialSPI_ReceiveByte(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
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static inline uint8_t SerialSPI_ReceiveByte(USART_t* const USART)
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static inline uint8_t SerialSPI_ReceiveByte(USART_t* const USART)
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{
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{
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return SerialSPI_TransferByte(USART, 0);
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return SerialSPI_TransferByte(USART, 0);
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}
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}
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/* Disable C linkage for C++ Compilers: */
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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#if defined(__cplusplus)
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}
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}
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Dean Camera
12 years ago