xmt_char 129 bsp/drv/dev/serial/serial.c sc->ops->xmt_char(port, c); xmt_char 167 bsp/drv/dev/serial/serial.c sc->ops->xmt_char(port, c); xmt_char 42 bsp/drv/include/serial.h void (*xmt_char)(struct serial_port *port, char c);