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/*
uart_udp.c
Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
This file is part of simavr.
simavr is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
simavr is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with simavr. If not, see <http://www.gnu.org/licenses/>.
*/
#include <pthread.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include "uart_udp.h"
#include "avr_uart.h"
#include "sim_hex.h"
DEFINE_FIFO(uint8_t,uart_udp_fifo);
/*
* called when a byte is send via the uart on the AVR
*/
static void uart_udp_in_hook(struct avr_irq_t * irq, uint32_t value, void * param)
{
uart_udp_t * p = (uart_udp_t*)param;
// printf("uart_udp_in_hook %02x\n", value);
uart_udp_fifo_write(&p->in, value);
}
/*
* Called when the uart has room in it's input buffer. This is called repeateadly
* if necessary, while the xoff is called only when the uart fifo is FULL
*/
static void uart_udp_xon_hook(struct avr_irq_t * irq, uint32_t value, void * param)
{
uart_udp_t * p = (uart_udp_t*)param;
// if (!p->xon)
// printf("uart_udp_xon_hook\n");
p->xon = 1;
// try to empty our fifo, the uart_udp_xoff_hook() will be called when
// other side is full
while (p->xon && !uart_udp_fifo_isempty(&p->out)) {
uint8_t byte = uart_udp_fifo_read(&p->out);
// printf("uart_udp_xon_hook send %02x\n", byte);
avr_raise_irq(p->irq + IRQ_UART_UDP_BYTE_OUT, byte);
}
}
/*
* Called when the uart ran out of room in it's input buffer
*/
static void uart_udp_xoff_hook(struct avr_irq_t * irq, uint32_t value, void * param)
{
uart_udp_t * p = (uart_udp_t*)param;
// if (p->xon)
// printf("uart_udp_xoff_hook\n");
p->xon = 0;
}
static void * uart_udp_thread(void * param)
{
uart_udp_t * p = (uart_udp_t*)param;
while (1) {
fd_set read_set, write_set;
int max = p->s + 1;
FD_ZERO(&read_set);
FD_ZERO(&write_set);
FD_SET(p->s, &read_set);
if (!uart_udp_fifo_isempty(&p->in))
FD_SET(p->s, &write_set);
struct timeval timo = { 0, 500 }; // short, but not too short interval
int ret = select(max, &read_set, &write_set, NULL, &timo);
if (!ret)
continue;
if (FD_ISSET(p->s, &read_set)) {
uint8_t buffer[512];
socklen_t len = sizeof(p->peer);
ssize_t r = recvfrom(p->s, buffer, sizeof(buffer)-1, 0, (struct sockaddr*)&p->peer, &len);
// hdump("udp recv", buffer, r);
// write them in fifo
uint8_t * src = buffer;
while (r-- && !uart_udp_fifo_isfull(&p->out))
uart_udp_fifo_write(&p->out, *src++);
if (r > 0)
printf("UDP dropped %zu bytes\n", r);
}
if (FD_ISSET(p->s, &write_set)) {
uint8_t buffer[512];
// write them in fifo
uint8_t * dst = buffer;
while (!uart_udp_fifo_isempty(&p->in) && dst < (buffer+sizeof(buffer)))
*dst++ = uart_udp_fifo_read(&p->in);
socklen_t len = dst - buffer;
/*size_t r = */sendto(p->s, buffer, len, 0, (struct sockaddr*)&p->peer, sizeof(p->peer));
// hdump("udp send", buffer, r);
}
}
return NULL;
}
static const char * irq_names[IRQ_UART_UDP_COUNT] = {
[IRQ_UART_UDP_BYTE_IN] = "8<uart_udp.in",
[IRQ_UART_UDP_BYTE_OUT] = "8>uart_udp.out",
};
void uart_udp_init(struct avr_t * avr, uart_udp_t * p)
{
p->avr = avr;
p->irq = avr_alloc_irq(&avr->irq_pool, 0, IRQ_UART_UDP_COUNT, irq_names);
avr_irq_register_notify(p->irq + IRQ_UART_UDP_BYTE_IN, uart_udp_in_hook, p);
if ((p->s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
fprintf(stderr, "%s: Can't create socket: %s", __FUNCTION__, strerror(errno));
return ;
}
struct sockaddr_in address = { 0 };
address.sin_family = AF_INET;
address.sin_port = htons (4321);
if (bind(p->s, (struct sockaddr *) &address, sizeof(address))) {
fprintf(stderr, "%s: Can not bind socket: %s", __FUNCTION__, strerror(errno));
return ;
}
printf("uart_udp_init bridge on port %d\n", 4321);
pthread_create(&p->thread, NULL, uart_udp_thread, p);
}
void uart_udp_connect(uart_udp_t * p, char uart)
{
// disable the stdio dump, as we are sending binary there
uint32_t f = 0;
avr_ioctl(p->avr, AVR_IOCTL_UART_GET_FLAGS(uart), &f);
f &= ~AVR_UART_FLAG_STDIO;
avr_ioctl(p->avr, AVR_IOCTL_UART_SET_FLAGS(uart), &f);
avr_irq_t * src = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_OUTPUT);
avr_irq_t * dst = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_INPUT);
avr_irq_t * xon = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_OUT_XON);
avr_irq_t * xoff = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_OUT_XOFF);
if (src && dst) {
avr_connect_irq(src, p->irq + IRQ_UART_UDP_BYTE_IN);
avr_connect_irq(p->irq + IRQ_UART_UDP_BYTE_OUT, dst);
}
if (xon)
avr_irq_register_notify(xon, uart_udp_xon_hook, p);
if (xoff)
avr_irq_register_notify(xoff, uart_udp_xoff_hook, p);
}
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