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// Wrappers for AVR usb serial.
//
// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <avr/interrupt.h> // USART0_RX_vect
#include <string.h> // memmove
#include "../lib/pjrc_usb_serial/usb_serial.h"
#include "sched.h" // DECL_INIT
#define USBSERIAL_BUFFER_SIZE 64
static char receive_buf[USBSERIAL_BUFFER_SIZE];
static uint8_t receive_pos;
static char transmit_buf[USBSERIAL_BUFFER_SIZE];
void
usbserial_init(void)
{
usb_init();
}
DECL_INIT(usbserial_init);
// Return a buffer (and length) containing any incoming messages
char *
console_get_input(uint8_t *plen)
{
for (;;) {
if (receive_pos >= sizeof(receive_buf))
break;
int16_t ret = usb_serial_getchar();
if (ret == -1)
break;
receive_buf[receive_pos++] = ret;
}
*plen = receive_pos;
return receive_buf;
}
// Remove from the receive buffer the given number of bytes
void
console_pop_input(uint8_t len)
{
uint8_t needcopy = receive_pos - len;
if (needcopy)
memmove(receive_buf, &receive_buf[len], needcopy);
receive_pos = needcopy;
}
// Return an output buffer that the caller may fill with transmit messages
char *
console_get_output(uint8_t len)
{
if (len > sizeof(transmit_buf))
return NULL;
return transmit_buf;
}
// Accept the given number of bytes added to the transmit buffer
void
console_push_output(uint8_t len)
{
usb_serial_write((void*)transmit_buf, len);
usb_serial_flush_output();
}
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