/**
* Read data from SPI bus.
* Since we are master, we have to trigger slave by sending
* fake chars on the bus.
*/
static size_t spimaster_read(struct KFile *fd, void *_buf, size_t size)
{
Serial *fd_spi = SERIAL_CAST(fd);
ser_flush(&fd_spi->fd);
ser_purgeRx(fd_spi);
size_t total_rd = 0;
uint8_t *buf = (uint8_t *)_buf;
int c;
while (size--)
{
/*
* Send and receive chars 1 by 1, otherwise the rxfifo
* will overrun.
*/
ser_putchar(0, fd_spi);
if ((c = ser_getchar(fd_spi)) == EOF)
break;
*buf++ = c;
total_rd++;
}
return total_rd;
}
int ser_open (int *serRef, struct termios *oldtio, char *deviceName, long baudRate)
{
int status = 0;
struct termios newtio;
/*open the device to be non-blocking*/
*serRef = open(deviceName, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (*serRef >= 0)
{
/* save current port settings*/
if (oldtio != NULL)
tcgetattr(*serRef, oldtio);
/* set new port settings*/
/*
BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed.
CRTSCTS : output hardware flow control (only used if the cable has
all necessary lines. See sect. 7 of Serial-HOWTO)
CS8 : 8n1 (8bit,no parity,1 stopbit)
CLOCAL : local connection, no modem contol
CREAD : enable receiving characters
CSTOPB : stop bit
PARENB : parity bit
*/
newtio.c_cflag = CS8 | CLOCAL | CREAD;
#ifdef MACOSX_USBSERIAL
newtio.c_cflag = |= CSIZE;
#endif
cfsetspeed(&newtio, baudRate); /* must be called after setting newtio.c_flag */
newtio.c_iflag = IGNPAR;
newtio.c_oflag = 0;
newtio.c_lflag = 0;
newtio.c_cc[VMIN]=0; /* non-blocking read*/
newtio.c_cc[VTIME]=0;
ser_flush (*serRef);
tcsetattr(*serRef,TCSANOW,&newtio);
}
else
/**
* Clean up serial port, disabling the associated hardware.
*/
static int ser_close(struct KFile *fd)
{
Serial *fds = SERIAL_CAST(fd);
Serial *port = fds;
ASSERT(port->is_open);
DB(port->is_open = false);
// Wait until we finish sending everything
ser_flush(fd);
port->hw->table->cleanup(port->hw);
DB(port->hw = NULL);
/*
* We purge the FIFO buffer only after the low-level cleanup, so that
* we are sure that there are no more interrupts.
*/
ser_purge(fds);
return 0;
}
