advanced_BR.c

/* INCLUDE FILE DECLARATIONS */
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/types.h>
#include <pthread.h>
#include "ioctl.h"

/* LOCAL VARIABLES DECLARATIONS */

int base_clock_array[3] = {1838235, 125000000, 24000000};

static void usage()
{
	printf("\nUsage: advanced_BR [option], example: \"advanced_BR -d /dev/ttyF0 -b 0 -m 0 -l 1 -s 16\"\n\n");
	printf("The baud rate formula is: [base clock] / ([DLM]*256 + [DLL]) / [sampling]\n\n");
	printf("-d [dev]	specfiy the AX99100 serial port, for example '/dev/ttyF0'\n");
	printf("-b [base clock]	specfiy number of the base clock from table below\n");
	printf("		0:	1838235\n");
	printf("		1:	125000000\n");
	printf("		2:	24000000 (External)\n");
	printf("-m [DLM]	input the number of Divisor Latch MSB, range 0-255\n");
	printf("-l [DLL]	input the number of Divisor Latch LSB, range 0-255\n");
	printf("-s [sampling]	input the number of sampling clock, range 4-255\n");
	printf("-r [recovery]	recovery the standard baud rate(ignore other parameters)\n\n");

}

int main(int argc, char* argv[])
{

	char	*program;
	int	c;
	char	buf[32];
	int	dev;
	int	base_clock;
	int	dlm;
	int	dll;
	int	sampling_clock;
	int	recovery;

	int	devfd;
	int	custom_baud;
	int	product;
	int	parameter;

	int	eds_eoes;

	program = strrchr(argv[0], '/');
	program = program ? 1 + program : argv[0];
	
	dev = 0;
	base_clock = 0;
	dlm = 0;
	dll = 1;
	sampling_clock = 16;
	recovery = 0;

	while (EOF != (c = getopt(argc, argv, "d:b:m:l:s:hr"))) {
		switch (c) {
		case 'd':
			strcpy(buf, optarg);
			if (memcmp(buf, "/dev/ttyF", 9) != 0) {
				printf("Not AX99100 serial port node.\n");
				return -1;
			}
			dev = 1;
			break;
		case 'b':
			if (atoi(optarg) < 0 || atoi(optarg) > 2) {
				printf("Please select the base clock from 0-2.\n");
				return -1;
			} else {
				base_clock = atoi(optarg);				
			}
			break;
		case 'm':
			if (atoi(optarg) < 0 || atoi(optarg) > 255) {
				printf("DLM value must be 0-255.\n");
				return -1;
			} else {
				dlm = atoi(optarg);
			}
			break;
		case 'l':
			if (atoi(optarg) < 0 || atoi(optarg) > 255) {
				printf("DLL value must be 0-255.\n");
				return -1;
			} else {
				dll = atoi(optarg);
			}
			break;
		case 's':
			if (atoi(optarg) < 4 || atoi(optarg) > 255) {
				printf("samlping clock must be 4-255.\n");
				return -1;
			} else {
				sampling_clock = atoi(optarg);
			}			
			break;
		case 'r':
			recovery = 1;			
			break;
		case 'h':
			usage();
			return 0;	
		default:
			usage();
			return 0;					
		}
	}

	if (dev == 0 && recovery == 0) {
		usage();
		return 0;
	}	

	if ((dlm == 0) && (dll == 0)) {
		dll = 1;
	}
	//open port
	devfd = open(buf, O_RDWR);

	if (devfd == -1) {
		printf("Can't open AX99100 serial port\n");
		return 0;
	}

	if (base_clock == 0x02) {
		if (ioctl(devfd, IOCTL_GET_EDS_EOES, &eds_eoes) < 0) {
			printf("IOCTL_GET_EDS_EOES failed!!!\n");
			return 0;	
		}
		if (!(eds_eoes & 0x2000000)) {
			printf("Extenal Oscillator does not exist!\n");
			printf("Baud Rate setting is unsuccessful!\n");
			printf("Baud Rate setting: 115200\n");	
			base_clock = 0x00;
			dlm = 0x00;
			dll = 0x01;	
			sampling_clock = 0x10;				
		}
	}

	if (ioctl(devfd, IOCTL_GET_PRODUCT, &product) < 0) {
		printf("IOCTL_GET_PRODUCT failed!!!\n");
		return 0;	
	}

	if (!(product == 0 || product == 1)) {
		printf("\nPort %s dose not support.\n", buf);
		return 0;
	}

	if (ioctl(devfd, IOCTL_GET_CUSTOM, &custom_baud) < 0) {
		printf("IOCTL_GET_CUSTOM failed!!!\n");
		return 0;	
	}

	if (recovery == 0) {

		custom_baud = (base_clock_array[base_clock] / (dlm * 256 + dll)) / sampling_clock;

		parameter = 0;
		parameter |= base_clock << 20;		//bit[27:20] = baud base clock
		parameter |= dlm << 12;			//bit[19:12] = DLM
		parameter |= dll << 4;			//bit[11:4] = DLL
		parameter |= sampling_clock << 0; 	//bit[3:0] = sampling rate
		
	} else {
	
		custom_baud = 0;

		parameter = 0;
		parameter |= 0 << 20;	//bit[27:20] = baud base clock
		parameter |= 0 << 12;	//bit[19:12] = DLM
		parameter |= 1 << 4;	//bit[11:4] = DLL
		parameter |= 16 << 0; 	//bit[3:0] = sampling rate		
	}

	if (ioctl(devfd, IOCTL_SET_CUSTOM, custom_baud) < 0) {
		printf("IOCTL_SET_CUSTOM failed!!!\n");
		return 0;	
	}

	if (custom_baud == 0)
		printf("\nPort %s support standard baud rate\n", buf);
	else
		printf("\nPort %s support custom baud rate: %d bps\n", buf, custom_baud);

	if (ioctl(devfd, IOCTL_SET_PARAMETER, parameter) < 0) {
		printf("IOCTL_SET_PARAMETER failed!!!\n");
		return 0;	
	}
	
	if (ioctl(devfd, IOCTL_SET_SAMPLING, sampling_clock) < 0) {
		printf("IOCTL_SET_SAMPLING failed!!!\n");
		return 0;	
	}
	
	
	close(devfd);
	
	printf("The %s will operating in custom baud rate after open(re-open) it.\n\n", buf);

	return 0;
}