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#include "project.h"
#define BUFFER_SIZE 32
#define TIMEOUT 500
#define SLEEPY 550
#define BACKOFF 200
#define N_CMDS 4
static char modem_buf[BUFFER_SIZE];
static unsigned modem_ptr;
static char *modem_cmds[N_CMDS];
static int modem_cmds_ptr;
static int timeout;
static int sleepy = SLEEPY;
int in_call;
int dialtone;
void
modem_send (void)
{
if (!modem_cmds_ptr) return;
if (sleepy >= SLEEPY)
{
printf ("modem is sleepy\r\n");
usart2_queue ('\r');
sleepy = 0;
timeout = BACKOFF;
return;
}
sleepy = 0;
printf ("(re)send %s\r\n",modem_cmds[0]);
timeout = TIMEOUT;
usart2_queue ('\r');
usart2_tx (modem_cmds[0], strlen (modem_cmds[0]));
usart2_queue ('\r');
}
void modem_cmd(char *buf)
{
if (modem_cmds_ptr==N_CMDS) return;
modem_cmds[modem_cmds_ptr]=buf;
modem_cmds_ptr++;
if (modem_cmds_ptr==1) modem_send();
}
void modem_dial (char *buf) {
in_call=1;
modem_cmd(buf);
}
void modem_tone_off()
{
// modem_cmd ("AT+STTONE=0");
modem_cmd("AT+SIMTONE=1,400,200,0,10");
}
void modem_tone(int i)
{
static char tone[]={'A','T','+','S','T','T','O','N','E','=','1',',','0','0',',','4','5','0','0','0',0};
tone[12]='0'+(i/10);
tone[13]='0'+(i%10);
modem_cmd(tone);
}
void modem_tone_nu(void)
{
modem_cmd("AT+SIMTONE=1,400,200,0,45000");
}
void
modem_line ()
{
int i;
printf ("Modem said: %s\r\n", modem_buf);
sleepy = 0;
if (!strncmp (modem_buf, "RDY", 4))
{
modem_cmd ("ATZ");
modem_cmd ("AT+CALM=1");
modem_cmd ("AT+CLVL=90");
}
else
if (!strncmp (modem_buf, "RING", 4))
{
dialstr_clear ();
dialtone = 0;
if (!hook)
{
answer_call ();
}
else
{
ringer_ring (4000);
}
}
else
if (!strncmp (modem_buf, "OK", 2) || !strncmp (modem_buf, "ERROR", 2))
{
if (modem_cmds_ptr) {
for (i=1;i<modem_cmds_ptr;++i) {
modem_cmds[i-1]=modem_cmds[i];
}
modem_cmds_ptr--;
modem_cmds[modem_cmds_ptr]=NULL;
timeout = 0;
if (modem_cmds_ptr) modem_send();
}
}
else
if (!strncmp (modem_buf, "NO CARRIER", 10)) {
in_call=0;
if (!hook)
modem_tone_nu();
}
}
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");
dialtone = 0;
modem_cmd ("ATA");
in_call=1;
}
void
terminate_call (void)
{
printf ("Terminating any call\r\n");
modem_cmd ("ATH0");
in_call=0;
}
void
dialtone_on (void)
{
dialtone = 1;
modem_tone(20);
}
void
dialtone_off (void)
{
if (!dialtone)
return;
modem_tone_off();
dialtone = 0;
}
void
modem_tick (void)
{
if (sleepy < SLEEPY)
sleepy++;
if (!timeout)
return;
timeout--;
if (timeout)
return;
modem_send ();
}
void
modem_init (void)
{
}
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