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#include "project.h"
#define BUFFER_SIZE 32
#define TIMEOUT 500
#define SLEEPY 550
#define BACKOFF 200
static char modem_buf[BUFFER_SIZE];
static unsigned modem_ptr = 0;
static char *modem_cmd;
static int timeout;
static int sleepy = SLEEPY;
void
modem_send (char *buf)
{
modem_cmd = buf;
if (sleepy >= SLEEPY)
{
printf ("modem is sleepy\r\n");
usart2_queue ('\r');
sleepy = 0;
timeout = BACKOFF;
return;
}
sleepy = 0;
printf ("(re)send\r\n");
timeout = TIMEOUT;
usart2_queue ('\r');
usart2_tx (modem_cmd, strlen (modem_cmd));
usart2_queue ('\r');
}
void
modem_line ()
{
printf ("Modem said: %s\r\n", modem_buf);
sleepy = 0;
if (!strncmp (modem_buf, "RING", 4))
ring (4000);
if (!strncmp (modem_buf, "OK", 2))
{
modem_cmd = NULL;
timeout = 0;
}
}
void
modem_byte (uint8_t b)
{
if (b == '\n')
return;
if (b == '\r')
{
if (modem_ptr)
modem_line ();
modem_ptr = 0;
modem_buf[modem_ptr] = 0;
return;
}
if (modem_ptr >= (sizeof (modem_buf) - 1))
return;
modem_buf[modem_ptr] = b;
modem_ptr++;
modem_buf[modem_ptr] = 0;
}
void
answer_call (void)
{
printf ("Answering call\r\n");
modem_send ("ATA");
}
void
terminate_call (void)
{
printf ("Terminating any call\r\n");
modem_send ("ATH0");
}
void
modem_tick (void)
{
if (sleepy < SLEEPY)
sleepy++;
if (!timeout)
return;
timeout--;
if (timeout)
return;
modem_send (modem_cmd);
}
void
modem_init (void)
{
}
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