diff options
Diffstat (limited to 'lib')
-rw-r--r-- | lib/serialio.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/lib/serialio.c b/lib/serialio.c index fde2935..1f00be8 100644 --- a/lib/serialio.c +++ b/lib/serialio.c @@ -20,10 +20,78 @@ * along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>. */ +#include <avr/io.h> #include <stdio.h> #include "serialio.h" + +#ifdef USES_LUFA #include "LUFA/Drivers/Peripheral/Serial.h" +#else +#define SERIAL_UBBRVAL(Baud) ((((F_CPU / 16) + (Baud / 2)) / (Baud)) - 1) +#define SERIAL_2X_UBBRVAL(Baud) ((((F_CPU / 8) + (Baud / 2)) / (Baud)) - 1) + +static inline void Serial_Init(const uint32_t BaudRate, const uint8_t DoubleSpeed) +{ + UBRR0 = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate)); + + UCSR0C = ((1 << UCSZ01) | (1 << UCSZ00)); + UCSR0A = (DoubleSpeed ? (1 << U2X0) : 0); + UCSR0B = ((1 << TXEN0) | (1 << RXEN0)); + + DDRD |= (1 << 1); + PORTD |= (1 << 0); +} + +static inline uint8_t Serial_IsSendReady(void) +{ + return ((UCSR0A & (1 << UDRE0)) ? 1 : 0); +} + +static inline void Serial_SendByte(const char DataByte) +{ + while (!(Serial_IsSendReady())); + UDR0 = DataByte; +} + +int Serial_putchar(char DataByte, FILE *Stream) +{ + (void)Stream; + + Serial_SendByte(DataByte); + return 0; +} + +static inline uint8_t Serial_IsCharReceived(void) +{ + return ((UCSR0A & (1 << RXC0)) ? 1 : 0); +} + +static inline int16_t Serial_ReceiveByte(void) +{ + if (!(Serial_IsCharReceived())) + return -1; + + return UDR0; +} + +int Serial_getchar(FILE *Stream) +{ + (void)Stream; + + if (!(Serial_IsCharReceived())) + return _FDEV_EOF; + + return Serial_ReceiveByte(); +} + +void Serial_CreateStream(FILE* Stream) +{ + *Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar, _FDEV_SETUP_RW); +} +#endif + + static FILE serial_stream; |