drivers/ecos_lpc2138_sja1000/build_baudrate.c
changeset 93 16c8ceea8f18
parent 92 0d84d95790d9
child 94 bdf4c86be6b2
--- a/drivers/ecos_lpc2138_sja1000/build_baudrate.c	Tue Feb 13 17:21:19 2007 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,126 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-
-/*
-	CiA DS-301, p.20
-*/
-#define MAX_BIT_TIMING 9
-int table_bit_timing_settings[MAX_BIT_TIMING][3] =
-{
-	{1000, 8, 6}, /* baudrate, number of time quanta per bit, tsync+tseg1 */
-	{800, 10, 8},
-	{500, 16, 14},
-	{250, 16, 14},
-	{125, 16, 14},
-	{100, 16, 14},
-	{ 50, 16, 14},
-	{ 25, 16, 14},
-	{ 10, 16, 14}
-};
-
-
-void can_timing_registers(double f, int *v)
-/* fill the vector v with the proper setting for TIMER 0 and TIMER 1
-   regarding the clock and the baudrate */
-{
-	int i;
-
-	int BRP, TSEG1, TSEG2;
-
-	double nominal, tq, tscl;
-
-	double tclk = 1 / (f*1e6); /* sec */
-
-	for(i=0; i<MAX_BIT_TIMING; i++)
-	{
-		nominal = 1. / (table_bit_timing_settings[i][0]*1e3); /* nominal bit time */
-
-		tq = nominal / table_bit_timing_settings[i][1]; /* time quanta */
-
-		tscl = tq; /* Tsyncseg = Tscl (ref. SJA 1000 datasheet, p.51) */
-
-		/* tcsl = 2 tclk (BRP + 1) */
-		BRP = (int)(tscl / (2. * tclk) - 1.);
-
-		/* 
-			BRT0 = SJW * 64 + BRP 
-			SJW : synchonisation jump Width, user defined (0..3)
-		*/
-
-		/* tseg1 = tscl * (TSEG1 + 1) */
-		TSEG1 = (int)((table_bit_timing_settings[i][2] - 1)*tq/tscl - 1.);
-
-		/* tseg2 = tscl * (TSEG2 + 1) */
-		TSEG2 = (int)(2.*tq/tscl - 1.);
-
-		/*
-			BRT1 = SAM*128 + TSEG2*16 + TSEG1
-			SAM = Sampling (0 = single sampling, 1 = triple sampling)
-		*/
-
-		if (BRP < 64)
-		{
-			v[2*i] = BRP;
-			v[2*i+1] = TSEG1+16*TSEG2;
-		}
-		else
-		{
-			v[2*i] = 0;
-			v[2*i+1] = 0;
-		}
-	}
-}
-
-
-void print_header(double frequency, /* clock rate in MHz*/
-                  int    sjw)       /* 0..3 */
-{
-	int i, array[18];
-	FILE *f = fopen("baudrate_table.h", "w");
-
-	can_timing_registers(frequency, array);
-
-	fprintf(f, "#if !defined(_BAUDRATE_TABLE_H_)\n");
-	fprintf(f, "#define _BAUDRATE_TABLE_H_\n");
-	fprintf(f, "\n");
-	fprintf(f, "/*\n");
-	fprintf(f, "this file must be include only once in the project\n");
-	fprintf(f, "*/\n");
-	fprintf(f, "\n");
-	fprintf(f, "/* clock speed in MHz */\n");
-	fprintf(f, "#define CAN_CONTROLER_CLOCK_SPEED %.3lf\n", frequency);
-	fprintf(f, "#define CAN_CONTROLER_PHASE_SHIFT_TOLERANCE %d\n", sjw);
-
-	sjw = sjw << 6;
-
-	fprintf(f, "\n");
-	fprintf(f, "static int can_baudrate_registers[9][3] =\n");
-	fprintf(f, "{  /* BTR0    BTR1 */\n");
-
-	for(i=0; i<MAX_BIT_TIMING; i++)
-	{
-		if (array[2*i] == 0  && array[2*i+1] == 0)
-			fprintf(f, "    {0, 0x00, 0x00}, /* %4d kbits/s -- out of range*/\n", 
-				table_bit_timing_settings[i][0]);
-		else
-			fprintf(f, "    {1, 0x%02x, 0x%02x}, /* %4d kbits/s */\n", 
-				sjw|array[2*i], array[2*i+1],
-				table_bit_timing_settings[i][0]);
-	}
-
-	fprintf(f, "};\n");
-	fprintf(f, "\n");
-	fprintf(f, "#endif\n\n");
-
-	fclose(f);
-}
-
-
-int main(int argc, char *argv[])
-{	
-	if (argc == 3)
-		print_header(atof(argv[1]), atoi(argv[2]));
-	else
-		printf("usage: %s clock_in_Mhz error_rate_in_percent\n", argv[0]);
-}