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/****************************************************************************
*
* Copyright (c) 2003,2004 by EMS Dr. Thomas Wuensche
*
* - All rights reserved -
*
* This code is provided "as is" without warranty of any kind, either
* expressed or implied, including but not limited to the liability
* concerning the freedom from material defects, the fitness for parti-
* cular purposes or the freedom of proprietary rights of third parties.
*
*****************************************************************************
* Module name.: cpcusb
*****************************************************************************
* Include file: cpc.h
*****************************************************************************
* Project.....: Windows Driver Development Kit
* Filename....: sja2m16c.cpp
* Authors.....: (GU) Gerhard Uttenthaler
* (CS) Christian Schoett
*****************************************************************************
* Short descr.: converts baudrate between SJA1000 and M16C
*****************************************************************************
* Description.: handles the baudrate conversion from SJA1000 parameters to
* M16C parameters
*****************************************************************************
* Address : EMS Dr. Thomas Wuensche
* Sonnenhang 3
* D-85304 Ilmmuenster
* Tel. : +49-8441-490260
* Fax. : +49-8441-81860
* email: support@ems-wuensche.com
*****************************************************************************
* History
*****************************************************************************
* Version Date Auth Remark
*
* 01.00 ?? GU - initial release
* 01.10 ?????????? CS - adapted to fit into the USB Windows driver
* 02.00 18.08.2004 GU - improved the baudrate calculating algorithm
* - implemented acceptance filtering
* 02.10 10.09.2004 CS - adapted to fit into the USB Windows driver
*****************************************************************************
* ToDo's
*****************************************************************************
*/
/****************************************************************************/
/* I N C L U D E S
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include "cpc.h"
#include "cpc_int.h"
#include "cpcusb.h"
#include "sja2m16c.h"
/*********************************************************************/
int baudrate_m16c(int clk, int brp, int pr, int ph1, int ph2)
{
return (16000000 / (1 << clk)) / 2 / (brp + 1) / (1 + pr + 1 +
ph1 + 1 + ph2 +
1);
}
/*********************************************************************/
int samplepoint_m16c(int brp, int pr, int ph1, int ph2)
{
return (100 * (1 + pr + 1 + ph1 + 1)) / (1 + pr + 1 + ph1 + 1 +
ph2 + 1);
}
/****************************************************************************
* Function.....: SJA1000_TO_M16C_BASIC_Params
*
* Task.........: This routine converts SJA1000 CAN btr parameters into M16C
* parameters based on the sample point and the error. In
* addition it converts the acceptance filter parameters to
* suit the M16C parameters
*
* Parameters...: None
*
* Return values: None
*
* Comments.....:
*****************************************************************************
* History
*****************************************************************************
* 19.01.2005 CS - modifed the conversion of SJA1000 filter params into
* M16C params. Due to compatibility reasons with the
* older 82C200 CAN controller the SJA1000
****************************************************************************/
int SJA1000_TO_M16C_BASIC_Params(CPC_MSG_T * in)
{
int sjaBaudrate;
int sjaSamplepoint;
int *baudrate_error; // BRP[0..15], PR[0..7], PH1[0..7], PH2[0..7]
int *samplepoint_error; // BRP[0..15], PR[0..7], PH1[0..7], PH2[0..7]
int baudrate_error_merk;
int clk, brp, pr, ph1, ph2;
int clk_merk, brp_merk, pr_merk, ph1_merk, ph2_merk;
int index;
unsigned char acc_code0, acc_code1, acc_code2, acc_code3;
unsigned char acc_mask0, acc_mask1, acc_mask2, acc_mask3;
CPC_MSG_T * out;
C0CONR_T c0con;
C1CONR_T c1con;
int tmpAccCode;
int tmpAccMask;
// we have to convert the parameters into M16C parameters
CPC_SJA1000_PARAMS_T * pParams;
// check if the type is CAN parameters and if we have to convert the given params
if (in->type != CPC_CMD_T_CAN_PRMS
|| in->msg.canparams.cc_type != SJA1000)
return 0;
pParams =
(CPC_SJA1000_PARAMS_T *) & in->msg.canparams.cc_params.sja1000;
acc_code0 = pParams->acc_code0;
acc_code1 = pParams->acc_code1;
acc_code2 = pParams->acc_code2;
acc_code3 = pParams->acc_code3;
acc_mask0 = pParams->acc_mask0;
acc_mask1 = pParams->acc_mask1;
acc_mask2 = pParams->acc_mask2;
acc_mask3 = pParams->acc_mask3;
#ifdef _DEBUG_OUTPUT_CAN_PARAMS
info("acc_code0: %2.2Xh\n", acc_code0);
info("acc_code1: %2.2Xh\n", acc_code1);
info("acc_code2: %2.2Xh\n", acc_code2);
info("acc_code3: %2.2Xh\n", acc_code3);
info("acc_mask0: %2.2Xh\n", acc_mask0);
info("acc_mask1: %2.2Xh\n", acc_mask1);
info("acc_mask2: %2.2Xh\n", acc_mask2);
info("acc_mask3: %2.2Xh\n", acc_mask3);
#endif /* */
if (!
(baudrate_error =
(int *) vmalloc(sizeof(int) * 16 * 8 * 8 * 8 * 5))) {
err("Could not allocate memory\n");
return -3;
}
if (!
(samplepoint_error =
(int *) vmalloc(sizeof(int) * 16 * 8 * 8 * 8 * 5))) {
err("Could not allocate memory\n");
vfree(baudrate_error);
return -3;
}
memset(baudrate_error, 0xff, sizeof(baudrate_error));
memset(samplepoint_error, 0xff, sizeof(baudrate_error));
sjaBaudrate =
16000000 / 2 / SJA_BRP / (1 + SJA_TSEG1 + SJA_TSEG2);
sjaSamplepoint =
100 * (1 + SJA_TSEG1) / (1 + SJA_TSEG1 + SJA_TSEG2);
if (sjaBaudrate == 0) {
vfree(baudrate_error);
vfree(samplepoint_error);
return -2;
}
#ifdef _DEBUG_OUTPUT_CAN_PARAMS
info("\nStarting SJA CAN params\n");
info("-------------------------\n");
info("TS1 : %2.2Xh TS2 : %2.2Xh\n", SJA_TSEG1, SJA_TSEG2);
info("BTR0 : %2.2Xh BTR1: %2.2Xh\n", pParams->btr0,
pParams->btr1);
info("Baudrate: %d.%dkBaud\n", sjaBaudrate / 1000,
sjaBaudrate % 1000);
info("Sample P: 0.%d\n", sjaSamplepoint);
info("\n");
#endif /* */
c0con.bc0con.sam = SJA_SAM;
c1con.bc1con.sjw = SJA_SJW;
// calculate errors for all baudrates
index = 0;
for (clk = 0; clk < 5; clk++) {
for (brp = 0; brp < 16; brp++) {
for (pr = 0; pr < 8; pr++) {
for (ph1 = 0; ph1 < 8; ph1++) {
for (ph2 = 0; ph2 < 8; ph2++) {
baudrate_error[index] =
100 *
abs(baudrate_m16c
(clk, brp, pr, ph1,
ph2) -
sjaBaudrate) /
sjaBaudrate;
samplepoint_error[index] =
abs(samplepoint_m16c
(brp, pr, ph1,
ph2) -
sjaSamplepoint);
#if 0
info
("Baudrate : %d kBaud\n",
baudrate_m16c(clk,
brp, pr,
ph1,
ph2));
info
("Baudrate Error: %d\n",
baudrate_error
[index]);
info
("Sample P Error: %d\n",
samplepoint_error
[index]);
info
("clk : %d\n",
clk);
#endif /* */
index++;
}
}
}
}
}
// mark all baudrate_error entries which are outer limits
index = 0;
for (clk = 0; clk < 5; clk++) {
for (brp = 0; brp < 16; brp++) {
for (pr = 0; pr < 8; pr++) {
for (ph1 = 0; ph1 < 8; ph1++) {
for (ph2 = 0; ph2 < 8; ph2++) {
if ((baudrate_error[index]
>
BAUDRATE_TOLERANCE_PERCENT)
||
(samplepoint_error
[index] >
SAMPLEPOINT_TOLERANCE_PERCENT)
||
(samplepoint_m16c
(brp, pr, ph1,
ph2) >
SAMPLEPOINT_UPPER_LIMIT))
{
baudrate_error
[index] = -1;
} else
if (((1 + pr + 1 +
ph1 + 1 + ph2 +
1) < 8)
||
((1 + pr + 1 +
ph1 + 1 + ph2 +
1) > 25)) {
baudrate_error
[index] = -1;
}
#if 0
else {
info
("Baudrate : %d kBaud\n",
baudrate_m16c
(clk, brp, pr,
ph1, ph2));
info
("Baudrate Error: %d\n",
baudrate_error
[index]);
info
("Sample P Error: %d\n",
samplepoint_error
[index]);
}
#endif /* */
index++;
}
}
}
}
}
// find list of minimum of baudrate_error within unmarked entries
clk_merk = brp_merk = pr_merk = ph1_merk = ph2_merk = 0;
baudrate_error_merk = 100;
index = 0;
for (clk = 0; clk < 5; clk++) {
for (brp = 0; brp < 16; brp++) {
for (pr = 0; pr < 8; pr++) {
for (ph1 = 0; ph1 < 8; ph1++) {
for (ph2 = 0; ph2 < 8; ph2++) {
if (baudrate_error[index]
!= -1) {
if (baudrate_error
[index] <
baudrate_error_merk)
{
baudrate_error_merk
=
baudrate_error
[index];
brp_merk =
brp;
pr_merk =
pr;
ph1_merk =
ph1;
ph2_merk =
ph2;
clk_merk =
clk;
#if 0
info
("brp: %2.2Xh pr: %2.2Xh ph1: %2.2Xh ph2: %2.2Xh\n",
brp,
pr,
ph1,
ph2);
info
("Baudrate : %d kBaud\n",
baudrate_m16c
(clk,
brp,
pr,
ph1,
ph2));
info
("Baudrate Error: %d\n",
baudrate_error
[index]);
info
("Sample P Error: %d\n",
samplepoint_error
[index]);
#endif /* */
}
}
index++;
}
}
}
}
}
if (baudrate_error_merk == 100) {
info("ERROR: Could not convert CAN init parameter\n");
vfree(baudrate_error);
vfree(samplepoint_error);
return -1;
}
// setting m16c CAN parameter
c0con.bc0con.brp = brp_merk;
c0con.bc0con.pr = pr_merk;
c1con.bc1con.ph1 = ph1_merk;
c1con.bc1con.ph2 = ph2_merk;
#ifdef _DEBUG_OUTPUT_CAN_PARAMS
info("\nResulting M16C CAN params\n");
info("-------------------------\n");
info("clk : %2.2Xh\n", clk_merk);
info("ph1 : %2.2Xh ph2: %2.2Xh\n", c1con.bc1con.ph1 + 1,
c1con.bc1con.ph2 + 1);
info("pr : %2.2Xh brp: %2.2Xh\n", c0con.bc0con.pr + 1,
c0con.bc0con.brp + 1);
info("sjw : %2.2Xh sam: %2.2Xh\n", c1con.bc1con.sjw,
c0con.bc0con.sam);
info("co1 : %2.2Xh co0: %2.2Xh\n", c1con.c1con, c0con.c0con);
info("Baudrate: %d.%dBaud\n",
baudrate_m16c(clk_merk, c0con.bc0con.brp, c0con.bc0con.pr,
c1con.bc1con.ph1, c1con.bc1con.ph2) / 1000,
baudrate_m16c(clk_merk, c0con.bc0con.brp, c0con.bc0con.pr,
c1con.bc1con.ph1, c1con.bc1con.ph2) % 1000);
info("Sample P: 0.%d\n",
samplepoint_m16c(c0con.bc0con.brp, c0con.bc0con.pr,
c1con.bc1con.ph1, c1con.bc1con.ph2));
info("\n");
#endif /* */
out = in;
out->type = 6;
out->length = sizeof(CPC_M16C_BASIC_PARAMS_T) + 1;
out->msg.canparams.cc_type = M16C_BASIC;
out->msg.canparams.cc_params.m16c_basic.con0 = c0con.c0con;
out->msg.canparams.cc_params.m16c_basic.con1 = c1con.c1con;
out->msg.canparams.cc_params.m16c_basic.ctlr0 = 0x4C;
out->msg.canparams.cc_params.m16c_basic.ctlr1 = 0x00;
out->msg.canparams.cc_params.m16c_basic.clk = clk_merk;
out->msg.canparams.cc_params.m16c_basic.acc_std_code0 =
acc_code0;
out->msg.canparams.cc_params.m16c_basic.acc_std_code1 = acc_code1;
// info("code0: 0x%2.2X, code1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_code0, out->msg.canparams.cc_params.m16c_basic.acc_std_code1);
tmpAccCode = (acc_code1 >> 5) + (acc_code0 << 3);
out->msg.canparams.cc_params.m16c_basic.acc_std_code0 =
(unsigned char) tmpAccCode;
out->msg.canparams.cc_params.m16c_basic.acc_std_code1 =
(unsigned char) (tmpAccCode >> 8);
// info("code0: 0x%2.2X, code1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_code0, out->msg.canparams.cc_params.m16c_basic.acc_std_code1);
out->msg.canparams.cc_params.m16c_basic.acc_std_mask0 =
~acc_mask0;
out->msg.canparams.cc_params.m16c_basic.acc_std_mask1 =
~acc_mask1;
// info("mask0: 0x%2.2X, mask1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_mask0, out->msg.canparams.cc_params.m16c_basic.acc_std_mask1);
tmpAccMask = ((acc_mask1) >> 5) + ((acc_mask0) << 3);
// info("tmpAccMask: 0x%4.4X\n", tmpAccMask);
out->msg.canparams.cc_params.m16c_basic.acc_std_mask0 =
(unsigned char) ~tmpAccMask;
out->msg.canparams.cc_params.m16c_basic.acc_std_mask1 =
(unsigned char) ~(tmpAccMask >> 8);
// info("mask0: 0x%2.2X, mask1: 0x%2.2X\n", out->msg.canparams.cc_params.m16c_basic.acc_std_mask0, out->msg.canparams.cc_params.m16c_basic.acc_std_mask1);
out->msg.canparams.cc_params.m16c_basic.acc_ext_code0 =
(unsigned char) tmpAccCode;
out->msg.canparams.cc_params.m16c_basic.acc_ext_code1 =
(unsigned char) (tmpAccCode >> 8);
out->msg.canparams.cc_params.m16c_basic.acc_ext_code2 = acc_code2;
out->msg.canparams.cc_params.m16c_basic.acc_ext_code3 = acc_code3;
out->msg.canparams.cc_params.m16c_basic.acc_ext_mask0 =
(unsigned char) ~tmpAccMask;
out->msg.canparams.cc_params.m16c_basic.acc_ext_mask1 =
(unsigned char) ~(tmpAccMask >> 8);
out->msg.canparams.cc_params.m16c_basic.acc_ext_mask2 =
~acc_mask2;
out->msg.canparams.cc_params.m16c_basic.acc_ext_mask3 =
~acc_mask3;
vfree(baudrate_error);
vfree(samplepoint_error);
return 0;
}
|
