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serial_io.c
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serial_io.c
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#include <stdio.h>
#include <lwip/ip.h>
#include <netif/slipif.h>
#include <unistd.h>
#include <fcntl.h>
#include "lwip/sio.h"
/** Enables activity LEDs. */
#ifndef __unix__
#define ACTIVITY_LED_TOGGLE
#endif
#ifdef ACTIVITY_LED_TOGGLE
/* Altera files, to toggle LEDs */
#include <os_cfg.h>
#include <io.h>
#include <os_cpu.h>
#define ACTIVITY_LED_TX 0
#define ACTIVITY_LED_RX 1
#endif
int in, out;
/**
* Sends a single character to the serial device.
*
* @param c character to send
* @param fd serial device handle
*
* @note This function will block until the character can be sent.
* @bug On UNIX platform, writing to a broken FIFO pipe will cause a SIGPIPE
* to be raised.
*/
void sio_send(u8_t c, sio_fd_t fd)
{
int32_t led_val;
/* Toggles Tx led. */
#ifdef ACTIVITY_LED_TOGGLE
OS_CPU_SR cpu_sr;
OS_ENTER_CRITICAL();
led_val = IORD(LED_BASE, 0);
led_val ^= (1 << ACTIVITY_LED_TX);
IOWR(LED_BASE, 0, led_val);
OS_EXIT_CRITICAL();
#endif
write(out, &c, 1);
}
/**
* Reads from the serial device.
*
* @param fd serial device handle
* @param data pointer to data buffer for receiving
* @param len maximum length (in bytes) of data to receive
* @return number of bytes actually received - may be 0 if aborted by sio_read_abort
*
*/
u32_t sio_read(sio_fd_t fd, u8_t *data, u32_t len)
{
int32_t led_val;
/* Toggles Rx led */
#ifdef ACTIVITY_LED_TOGGLE
OS_CPU_SR cpu_sr;
OS_ENTER_CRITICAL();
led_val = IORD(LED_BASE, 0);
led_val ^= (1 << ACTIVITY_LED_RX);
IOWR(LED_BASE, 0, led_val);
OS_EXIT_CRITICAL();
#endif
return (u32_t)read(in, (void *)data, (size_t)len);
}
/**
* Tries to read from the serial device. Same as sio_read but returns
* immediately if no data is available and never blocks.
*
* @param fd serial device handle
* @param data pointer to data buffer for receiving
* @param len maximum length (in bytes) of data to receive
* @return number of bytes actually received
*/
u32_t sio_tryread(sio_fd_t fd, u8_t *data, u32_t len)
{
return sio_read(fd, data, len);
}
/**
* Opens a serial device for communication.
*
* @param devnum device number
* @return handle to serial device if successful, NULL otherwise
*/
sio_fd_t sio_open(u8_t devnum)
{
printf("opening devnum = %d\n", devnum);
#ifdef __unix__
if (devnum) {
in = open("server_in.fifo", O_RDONLY);
out = open("server_out.fifo", O_WRONLY);
} else {
out = open("server_in.fifo", O_WRONLY);
in = open("server_out.fifo", O_RDONLY);
}
#else
out = open("/dev/comBT2", O_WRONLY);
in = open("/dev/comBT2", O_RDONLY);
#endif
if (in == -1 || out == -1)
return NULL;
return ∈
}