--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/ecos_lpc2138_sja1000/build_baudrate.c	Wed May 10 16:59:40 2006 +0200
@@ -0,0 +1,126 @@
+#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]);
+}