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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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