4 Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
6 This file is part of simavr.
8 simavr is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 simavr is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with simavr. If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/select.h>
35 DEFINE_FIFO(uint8_t,uart_pty_fifo);
38 * called when a byte is send via the uart on the AVR
40 static void uart_pty_in_hook(struct avr_irq_t * irq, uint32_t value, void * param)
42 uart_pty_t * p = (uart_pty_t*)param;
43 //printf("uart_pty_in_hook %02x\n", value);
44 uart_pty_fifo_write(&p->in, value);
47 // try to empty our fifo, the uart_pty_xoff_hook() will be called when
49 static void uart_pty_flush_incoming(uart_pty_t * p)
51 while (p->xon && !uart_pty_fifo_isempty(&p->out)) {
52 uint8_t byte = uart_pty_fifo_read(&p->out);
53 // printf("uart_pty_flush_incoming send %02x\n", byte);
54 avr_raise_irq(p->irq + IRQ_UART_PTY_BYTE_OUT, byte);
59 * Called when the uart has room in it's input buffer. This is called repeateadly
60 * if necessary, while the xoff is called only when the uart fifo is FULL
62 static void uart_pty_xon_hook(struct avr_irq_t * irq, uint32_t value, void * param)
64 uart_pty_t * p = (uart_pty_t*)param;
66 printf("uart_pty_xon_hook\n");
68 uart_pty_flush_incoming(p);
72 * Called when the uart ran out of room in it's input buffer
74 static void uart_pty_xoff_hook(struct avr_irq_t * irq, uint32_t value, void * param)
76 uart_pty_t * p = (uart_pty_t*)param;
78 printf("uart_pty_xoff_hook\n");
82 static void * uart_pty_thread(void * param)
84 uart_pty_t * p = (uart_pty_t*)param;
87 fd_set read_set, write_set;
92 // read more only if buffer was flushed
93 if (p->buffer_len == p->buffer_done)
94 FD_SET(p->s, &read_set);
95 if (!uart_pty_fifo_isempty(&p->in))
96 FD_SET(p->s, &write_set);
98 struct timeval timo = { 0, 500 }; // short, but not too short interval
99 int ret = select(max, &read_set, &write_set, NULL, &timo);
106 if (FD_ISSET(p->s, &read_set)) {
107 ssize_t r = read(p->s, p->buffer, sizeof(p->buffer)-1);
110 // hdump("pty recv", p->buffer, r);
112 if (p->buffer_done < p->buffer_len) {
113 // write them in fifo
114 while (p->buffer_done < p->buffer_len && !uart_pty_fifo_isfull(&p->out))
115 uart_pty_fifo_write(&p->out, p->buffer[p->buffer_done++]);
117 if (FD_ISSET(p->s, &write_set)) {
119 // write them in fifo
120 uint8_t * dst = buffer;
121 while (!uart_pty_fifo_isempty(&p->in) && dst < (buffer+sizeof(buffer)))
122 *dst++ = uart_pty_fifo_read(&p->in);
123 size_t len = dst - buffer;
124 size_t r = write(p->s, buffer, len);
125 // hdump("pty send", buffer, r);
127 // uart_pty_flush_incoming(p);
132 static const char * irq_names[IRQ_UART_PTY_COUNT] = {
133 [IRQ_UART_PTY_BYTE_IN] = "8<uart_pty.in",
134 [IRQ_UART_PTY_BYTE_OUT] = "8>uart_pty.out",
137 void uart_pty_init(struct avr_t * avr, uart_pty_t * p)
140 p->irq = avr_alloc_irq(&avr->irq_pool, 0, IRQ_UART_PTY_COUNT, irq_names);
141 avr_irq_register_notify(p->irq + IRQ_UART_PTY_BYTE_IN, uart_pty_in_hook, p);
145 if (openpty(&m, &s, p->slavename, NULL, NULL) < 0) {
146 fprintf(stderr, "%s: Can't create pty: %s", __FUNCTION__, strerror(errno));
151 printf("uart_pty_init bridge on port *** %s ***\n", p->slavename);
153 pthread_create(&p->thread, NULL, uart_pty_thread, p);
157 void uart_pty_stop(uart_pty_t * p)
160 pthread_kill(p->thread, SIGINT);
163 pthread_join(p->thread, &ret);
166 void uart_pty_connect(uart_pty_t * p, char uart)
168 // disable the stdio dump, as we are sending binary there
170 avr_ioctl(p->avr, AVR_IOCTL_UART_GET_FLAGS(uart), &f);
171 f &= ~AVR_UART_FLAG_STDIO;
172 avr_ioctl(p->avr, AVR_IOCTL_UART_SET_FLAGS(uart), &f);
174 avr_irq_t * src = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_OUTPUT);
175 avr_irq_t * dst = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_INPUT);
176 avr_irq_t * xon = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_OUT_XON);
177 avr_irq_t * xoff = avr_io_getirq(p->avr, AVR_IOCTL_UART_GETIRQ(uart), UART_IRQ_OUT_XOFF);
179 avr_connect_irq(src, p->irq + IRQ_UART_PTY_BYTE_IN);
180 avr_connect_irq(p->irq + IRQ_UART_PTY_BYTE_OUT, dst);
183 avr_irq_register_notify(xon, uart_pty_xon_hook, p);
185 avr_irq_register_notify(xoff, uart_pty_xoff_hook, p);