sample collection function

sample_collect.c

static void serial_collect_samples(void *a_data __attribute__((unused))) {

	struct packet *data = (struct packet *)a_data;
	uint8_t size = 0x00;
	uint16_t buffs = (PWM_SAMPLES_BUFFER*PWM_BUFFERS);
	uint16_t avail = (buffs + g_head - g_tail) % buffs;

	if (avail > 192) {
		serial_poll_send("WAIT", 4);
	}

	if (0 >= (size = slip_recv((void *)data, 
					sizeof(struct packet)))) {
		return;
	}

	// ignore incomplete data chunks, packet should contain at least 1 sample
	if (size < 4) {
		return;
	}

	// verify if the information is genuine
	if (!slip_verify_crc16((unsigned char *)data, size, 0)) {
		return;
	}

	g_head += data->num;

}