diff options
Diffstat (limited to 'tmk_core/protocol/serial_uart.c')
-rw-r--r-- | tmk_core/protocol/serial_uart.c | 58 |
1 files changed, 28 insertions, 30 deletions
diff --git a/tmk_core/protocol/serial_uart.c b/tmk_core/protocol/serial_uart.c index 35df27fd6e..a15124193a 100644 --- a/tmk_core/protocol/serial_uart.c +++ b/tmk_core/protocol/serial_uart.c @@ -40,73 +40,71 @@ POSSIBILITY OF SUCH DAMAGE. #include <avr/interrupt.h> #include "serial.h" - #if defined(SERIAL_UART_RTS_LO) && defined(SERIAL_UART_RTS_HI) - // Buffer state - // Empty: RBUF_SPACE == RBUF_SIZE(head==tail) - // Last 1 space: RBUF_SPACE == 2 - // Full: RBUF_SPACE == 1(last cell of rbuf be never used.) - #define RBUF_SPACE() (rbuf_head < rbuf_tail ? (rbuf_tail - rbuf_head) : (RBUF_SIZE - rbuf_head + rbuf_tail)) - // allow to send - #define rbuf_check_rts_lo() do { if (RBUF_SPACE() > 2) SERIAL_UART_RTS_LO(); } while (0) - // prohibit to send - #define rbuf_check_rts_hi() do { if (RBUF_SPACE() <= 2) SERIAL_UART_RTS_HI(); } while (0) +// Buffer state +// Empty: RBUF_SPACE == RBUF_SIZE(head==tail) +// Last 1 space: RBUF_SPACE == 2 +// Full: RBUF_SPACE == 1(last cell of rbuf be never used.) +# define RBUF_SPACE() (rbuf_head < rbuf_tail ? (rbuf_tail - rbuf_head) : (RBUF_SIZE - rbuf_head + rbuf_tail)) +// allow to send +# define rbuf_check_rts_lo() \ + do { \ + if (RBUF_SPACE() > 2) SERIAL_UART_RTS_LO(); \ + } while (0) +// prohibit to send +# define rbuf_check_rts_hi() \ + do { \ + if (RBUF_SPACE() <= 2) SERIAL_UART_RTS_HI(); \ + } while (0) #else - #define rbuf_check_rts_lo() - #define rbuf_check_rts_hi() +# define rbuf_check_rts_lo() +# define rbuf_check_rts_hi() #endif - -void serial_init(void) -{ - SERIAL_UART_INIT(); -} +void serial_init(void) { SERIAL_UART_INIT(); } // RX ring buffer -#define RBUF_SIZE 256 +#define RBUF_SIZE 256 static uint8_t rbuf[RBUF_SIZE]; static uint8_t rbuf_head = 0; static uint8_t rbuf_tail = 0; -uint8_t serial_recv(void) -{ +uint8_t serial_recv(void) { uint8_t data = 0; if (rbuf_head == rbuf_tail) { return 0; } - data = rbuf[rbuf_tail]; + data = rbuf[rbuf_tail]; rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; rbuf_check_rts_lo(); return data; } -int16_t serial_recv2(void) -{ +int16_t serial_recv2(void) { uint8_t data = 0; if (rbuf_head == rbuf_tail) { return -1; } - data = rbuf[rbuf_tail]; + data = rbuf[rbuf_tail]; rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; rbuf_check_rts_lo(); return data; } -void serial_send(uint8_t data) -{ - while (!SERIAL_UART_TXD_READY) ; +void serial_send(uint8_t data) { + while (!SERIAL_UART_TXD_READY) + ; SERIAL_UART_DATA = data; } // USART RX complete interrupt -ISR(SERIAL_UART_RXD_VECT) -{ +ISR(SERIAL_UART_RXD_VECT) { uint8_t next = (rbuf_head + 1) % RBUF_SIZE; if (next != rbuf_tail) { rbuf[rbuf_head] = SERIAL_UART_DATA; - rbuf_head = next; + rbuf_head = next; } rbuf_check_rts_hi(); } |