tmk
hace 10 años
Se han modificado 1 ficheros con 19 adiciones y 0 borrados
+ 19
- 0
protocol/serial_uart.c
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| @@ -41,6 +41,22 @@ POSSIBILITY OF SUCH DAMAGE. | |||
| #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) | |||
| #else | |||
| #define rbuf_check_rts_lo() | |||
| #define rbuf_check_rts_hi() | |||
| #endif | |||
| void serial_init(void) | |||
| { | |||
| SERIAL_UART_INIT(); | |||
| @@ -61,6 +77,7 @@ uint8_t serial_recv(void) | |||
| data = rbuf[rbuf_tail]; | |||
| rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; | |||
| rbuf_check_rts_lo(); | |||
| return data; | |||
| } | |||
| @@ -73,6 +90,7 @@ int16_t serial_recv2(void) | |||
| data = rbuf[rbuf_tail]; | |||
| rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; | |||
| rbuf_check_rts_lo(); | |||
| return data; | |||
| } | |||
| @@ -90,4 +108,5 @@ ISR(SERIAL_UART_RXD_VECT) | |||
| rbuf[rbuf_head] = SERIAL_UART_DATA; | |||
| rbuf_head = next; | |||
| } | |||
| rbuf_check_rts_hi(); | |||
| } | |||