- /* Public Interface - May be used in end-application: */
- /* Macros: */
- /** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
- * not set.
- */
- #define SERIAL_UBBRVAL(baud) ((((F_CPU / 16) + (baud / 2)) / (baud)) - 1)
-
- /** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
- * set.
- */
- #define SERIAL_2X_UBBRVAL(baud) ((((F_CPU / 8) + (baud / 2)) / (baud)) - 1)
-
- /* Function Prototypes: */
- /** Transmits a given string located in program space (FLASH) through the USART.
- *
- * \param[in] FlashStringPtr Pointer to a string located in program space.
- */
- void Serial_TxString_P(const char* FlashStringPtr) ATTR_NON_NULL_PTR_ARG(1);
-
- /** Transmits a given string located in SRAM memory through the USART.
- *
- * \param[in] StringPtr Pointer to a string located in SRAM space.
- */
- void Serial_TxString(const char* StringPtr) ATTR_NON_NULL_PTR_ARG(1);
-
- /* Inline Functions: */
- /** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to
- * standard 8-bit, no parity, 1 stop bit settings suitable for most applications.
- *
- * \param[in] BaudRate Serial baud rate, in bits per second.
- * \param[in] DoubleSpeed Enables double speed mode when set, halving the sample time to double the baud rate.
- */
- static inline void Serial_Init(const uint32_t BaudRate,
- const bool DoubleSpeed)
- {
- UBRR1 = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
-
- UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10));
- UCSR1A = (DoubleSpeed ? (1 << U2X1) : 0);
- UCSR1B = ((1 << TXEN1) | (1 << RXEN1));
-
- DDRD |= (1 << 3);
- PORTD |= (1 << 2);
- }
-
- /** Turns off the USART driver, disabling and returning used hardware to their default configuration. */
- static inline void Serial_ShutDown(void)
- {
- UCSR1B = 0;
- UCSR1A = 0;
- UCSR1C = 0;
-
- UBRR1 = 0;
-
- DDRD &= ~(1 << 3);
- PORTD &= ~(1 << 2);
- }
-
- /** Indicates whether a character has been received through the USART.
- *
- * \return Boolean true if a character has been received, false otherwise.
- */
- static inline bool Serial_IsCharReceived(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
- static inline bool Serial_IsCharReceived(void)
- {
- return ((UCSR1A & (1 << RXC1)) ? true : false);
- }
-
- /** Transmits a given byte through the USART.
- *
- * \param[in] DataByte Byte to transmit through the USART.
- */
- static inline void Serial_TxByte(const char DataByte) ATTR_ALWAYS_INLINE;
- static inline void Serial_TxByte(const char DataByte)
- {
- while (!(UCSR1A & (1 << UDRE1)));
- UDR1 = DataByte;
- }
-
- /** Receives a byte from the USART. This function blocks until a byte has been
- * received; if non-blocking behaviour is required, test for a received character
- * beforehand with \ref Serial_IsCharReceived().
- *
- * \return Byte received from the USART.
- */
- static inline char Serial_RxByte(void) ATTR_ALWAYS_INLINE;
- static inline char Serial_RxByte(void)
- {
- while (!(UCSR1A & (1 << RXC1)));
- return UDR1;
- }
-
- /* Disable C linkage for C++ Compilers: */
- #if defined(__cplusplus)
- }
- #endif
-