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Workaround for 8M mcu to use soft uart. #457

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Workaround for 8M mcu to use soft uart. #457

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12 changes: 12 additions & 0 deletions keyboard/hhkb/config_rn42.h
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Original file line number Diff line number Diff line change
Expand Up @@ -63,9 +63,20 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#define RTSEN 0
#define CTSEN 1

#if (F_CPU == 8000000)
#define USE_U2X
#else
#undef USE_U2X
#endif
#define SERIAL_UART_BAUD 115200
#define SERIAL_UART_DATA UDR1
#ifdef USE_U2X
#define SERIAL_UART_UBRR ((F_CPU/(8.0*SERIAL_UART_BAUD)-1+0.5))
#define SET_U2X1 ((UCSR1A |= (1<<U2X1)))
#else
#define SERIAL_UART_UBRR ((F_CPU/(16.0*SERIAL_UART_BAUD)-1+0.5))
#define SET_U2X1
#endif
#define SERIAL_UART_RXD_VECT USART1_RX_vect
#define SERIAL_UART_TXD_READY (UCSR1A&(1<<UDRE1))
#define SERIAL_UART_INIT() do { \
Expand All @@ -76,6 +87,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
UCSR1C |= (0<<UPM11) | (0<<UPM10); /* parity: none(00), even(01), odd(11) */ \
UCSR1D |= (0<<RTSEN) | (0<<CTSEN); /* RTS, CTS(no flow control by hardware) */ \
DDRD |= (1<<5); PORTD &= ~(1<<5); /* RTS for flow control by firmware */ \
SET_U2X1; \
sei(); \
} while(0)
#define SERIAL_UART_RTS_LO() do { PORTD &= ~(1<<5); } while (0)
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