source: trunk/software/firmware/my_serial2.h @ 17

char getchar(void);

#define UART2_BUFSIZE 16
#define UART2_BUFSIZE_MASK 0x0f

extern char uart2_txbuf[UART2_BUFSIZE];
extern unsigned char uart2_txbuf_prod;
extern volatile unsigned char uart2_txbuf_cons;

extern char uart2_rxbuf[UART2_BUFSIZE];
extern volatile unsigned char uart2_rxbuf_prod;
extern unsigned char uart2_rxbuf_cons;

char uart2_getchar(void);
void uart2_putchar_raw(char);

#define USART2_INIT { \
                uart2_txbuf_prod = uart2_txbuf_cons = 0; \
                uart2_rxbuf_prod = uart2_rxbuf_cons = 0; \
                (void)RCREG2; \
                PIE3bits.RC2IE = 1; \
        }

#define USART2_INTR {\
        if (PIE3bits.TX2IE && PIR3bits.TX2IF) { \
                if (uart2_txbuf_prod == uart2_txbuf_cons) { \
                        PIE3bits.TX2IE = 0; /* buffer empty */ \
                } else { \
                        /* Place char in TXREG - this starts transmition */ \
                        TXREG2 = uart2_txbuf[uart2_txbuf_cons]; \
                        uart2_txbuf_cons = (uart2_txbuf_cons + 1) & UART2_BUFSIZE_MASK;\
                } \
        } \
        if (PIE3bits.RC2IE && PIR3bits.RC2IF) { \
                register char c = RCREG2; \
                if (RCSTA2bits.OERR) { \
                        RCSTA2bits.CREN = 0; \
                        RCSTA2bits.CREN = 1; \
                } \
                uart2_rxbuf_prod = (uart2_rxbuf_prod + 1) & UART2_BUFSIZE_MASK;\
                uart2_rxbuf[uart2_rxbuf_prod] = c; \
        }\
    }