How to connect two lpc11C24 ?

[lpcware]

Content originally posted in LPCWare by Ronbra on Mon May 20 07:26:56 MST 2013
Hi,
Can you tell me how to connect two lpc11c24 with C_CAN with on-chip or CANopen, and how to communicate with each-other ???

[lpcware]

Content originally posted in LPCWare by R2D2 on Wed May 22 00:21:44 MST 2013

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Quote: Ronbra
It was unable to communicate with each-other.

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Do you understand the readme.txt?

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Quote:

This sample project serves as a simple demonstration to use
the built-in on-chip CAN and CANopen drivers available on
the LPC11C00 NXP microcontroller series.

Hardware Requirements:
An external CAN Analyzer/Generator is needed to send and
receive CAN frames to the LPC11C00.

CAN Configuration:
CAN bus baudrate: 125kbps

Sample Project Details:

[COLOR=Red]1.    Upon reset, the LPC11C00 will send a simple CAN frame
    using the on-chip CAN drivers. It will send a CAN frame
    with its data contents of "TEST".[/COLOR]

[COLOR=Red]2.    Whenever the LPC11C00 receives a CAN frame whose ID is
    between 0x400-0x4FF, it will simply resend the received
    frame back onto the CAN bus.[/COLOR]

3.    The LPC11C00 is now also responsive to Expedited SDO
    transfers. By default, the CANopen ID is 20 (0x14).

4.    While the LPC11C00 isn't sending or receiving CAN frames
    it will go into SLEEP. It resumes automatically into
    active mode once it has received a CAN frame.

5.    CAUTION! CAUTION! CAUTION! CAUTION! CAUTION! CAUTION!
    =====================================================
    Make sure to reserve memory from 0x1000 0050 - 0x1000 00B8
    for the on_chip CAN drivers!
    See the project's linker scripts and the LPC11C1x Usermanual
    for details.
    =====================================================
    CAUTION! CAUTION! CAUTION! CAUTION! CAUTION! CAUTION!

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[lpcware]

Content originally posted in LPCWare by Ronbra on Tue May 21 23:27:49 MST 2013

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Quote: R2D2
What didn't work?

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It was unable to communicate with each-other.

[lpcware]

Content originally posted in LPCWare by R2D2 on Tue May 21 06:26:08 MST 2013

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Quote: Ronbra
the problem is that I tried to connect CAN-H / CAN-L (without 120R resistor) but it didn't work.

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What didn't work?

[lpcware]

Content originally posted in LPCWare by Ronbra on Tue May 21 06:20:49 MST 2013

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Quote: R2D2
So you have 2  LPCXpresso11C24 and the standard canopen_onchip sample ?

That's working out of the box after connecting CAN-H / CAN-L.

As described in canopen_onchip_readme.txt:
So what is the problem?

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the problem is that I tried to connect CAN-H / CAN-L (without 120R resistor) but it didn't work.
Can you write code for sender and a code for listener ?

[lpcware]

Content originally posted in LPCWare by R2D2 on Tue May 21 06:07:54 MST 2013
So you have 2  LPCXpresso11C24 and the standard canopen_onchip sample ?

That's working out of the box after connecting CAN-H / CAN-L.

As described in canopen_onchip_readme.txt:

---

Quote:

This sample project serves as a simple demonstration to use
the built-in on-chip CAN and CANopen drivers available on
the LPC11C00 NXP microcontroller series.

Hardware Requirements:
An external CAN Analyzer/Generator is needed to send and
receive CAN frames to the LPC11C00.

CAN Configuration:
CAN bus baudrate: 125kbps

Sample Project Details:

1.    Upon reset, the LPC11C00 will send a simple CAN frame
    using the on-chip CAN drivers. It will send a CAN frame
    with its data contents of "TEST".

2.    Whenever the LPC11C00 receives a CAN frame whose ID is
    between 0x400-0x4FF, it will simply resend the received
    frame back onto the CAN bus.

3.    The LPC11C00 is now also responsive to Expedited SDO
    transfers. By default, the CANopen ID is 20 (0x14).

4.    While the LPC11C00 isn't sending or receiving CAN frames
    it will go into SLEEP. It resumes automatically into
    active mode once it has received a CAN frame.

5.    CAUTION! CAUTION! CAUTION! CAUTION! CAUTION! CAUTION!
    =====================================================
    Make sure to reserve memory from 0x1000 0050 - 0x1000 00B8
    for the on_chip CAN drivers!
    See the project's linker scripts and the LPC11C1x Usermanual
    for details.
    =====================================================
    CAUTION! CAUTION! CAUTION! CAUTION! CAUTION! CAUTION!

---

So what is the problem?

[lpcware]

Content originally posted in LPCWare by Ronbra on Tue May 21 05:55:31 MST 2013

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Quote: R2D2
#1 There are samples in you Example folder, try them.

#2 Connecting LPC11C24 via CAN means connecting CAN-H and CAN-L, that's all. I'm not sure which hardware we are talking about (LPCXpresso11C24 ?) and if there's a termination somewhere in your bus.

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here are example code:

/****************************************************************************
 *   $Id:: main.c 5035 2010-09-24 23:48:55Z nxp12832                        $
 *   Project: NXP LPC11xx CAN example
 *
 *   Description:
 *     This file is part of the CAN and CANopen on-chip driver examples.
 *
 ****************************************************************************
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
****************************************************************************/
#include "driver_config.h"
#include "target_config.h"

#include "rom_drivers.h"

#ifndef NULL
#define NULL    ((void *)0)
#endif

ROM **rom = (ROM **)0x1fff1ff8;

CAN_MSG_OBJ msg_obj;

/* Initialize CAN Controller */
uint32_t ClkInitTable[2] = {
  0x00000000UL, // CANCLKDIV
  0x00001C57UL  // CAN_BTR
};

/* Callback function prototypes */
void CAN_rx(uint8_t msg_obj_num);
void CAN_tx(uint8_t msg_obj_num);
void CAN_error(uint32_t error_info);

/* CANopen Callback function prototypes */
uint32_t CANOPEN_sdo_exp_read (uint16_t index, uint8_t subindex);
uint32_t CANOPEN_sdo_exp_write(uint16_t index, uint8_t subindex, uint8_t *dat_ptr);
uint8_t CANOPEN_sdo_req (uint8_t length, uint8_t *req_ptr, uint8_t *length_resp, uint8_t *resp_ptr);

/* Publish CAN Callback Functions */
CAN_CALLBACKS callbacks = {
CAN_rx,
CAN_tx,
CAN_error,
CANOPEN_sdo_exp_read,
CANOPEN_sdo_exp_write,
NULL,
NULL,
NULL
};

/*CANopen read-only (constant) Object Dictionary (OD) entries
Used with Expidited SDO only. Lengths = 1/2/4 bytes */
CAN_ODCONSTENTRY myConstOD [] = {
/* index, subindex,length,value */
{ 0x1000, 0x00, 4, 0x54534554UL },  // "TEST"
{ 0x1018, 0x00, 1, 0x00000003UL },
{ 0x1018, 0x01, 4, 0x00000003UL },
{ 0x2000, 0x00, 1, (uint32_t)'M' },
};

/* Application variables used in variable OD */
uint8_t  error_register;
uint32_t device_id;
uint32_t fw_ver;
uint16_t param;

/*CANopen list of variable Object Dictionary (OD) entries
Expedited SDO with length=1/2/4 bytes */
CAN_ODENTRY myOD [] = {
/* index, subindex,access_type | length,value_pointer */
{ 0x1001, 0x00, OD_EXP_RO | 1,(uint8_t *)&error_register },
{ 0x1018, 0x02, OD_EXP_RO | 4,(uint8_t *)&device_id },
{ 0x1018, 0x03, OD_EXP_RO | 4,(uint8_t *)&fw_ver },
{ 0x2001, 0x00, OD_EXP_RW | 2,(uint8_t *)&param },
};

/* CANopen configuration structure */
static const CAN_CANOPENCFG myCANopen = {
20,// node_id
5,// msgobj_rx
6,// msgobj_tx
1,// isr_handled
sizeof(myConstOD)/sizeof(myConstOD[0]),// od_const_num 
(CAN_ODCONSTENTRY *)myConstOD,// od_const_table
sizeof(myOD)/sizeof(myOD[0]),// od_num
(CAN_ODENTRY *)myOD,// od_table
};

/*CAN receive callback */
/*Function is executed by the Callback handler after
a CAN message has been received */
void CAN_rx(uint8_t msg_obj_num){
  
  /* Determine which CAN message has been received */
  msg_obj.msgobj = msg_obj_num;
  /* Now load up the msg_obj structure with the CAN message */
  (*rom)->pCAND->can_receive(&msg_obj);

  if (msg_obj_num == 1)
  {
    /* Simply transmit CAN frame (echo) with with ID +0x100 via buffer 2 */
    msg_obj.msgobj = 2;
    msg_obj.mode_id += 0x100;
    (*rom)->pCAND->can_transmit(&msg_obj);
  }

  return;
}

/*CAN transmit callback */
/*Function is executed by the Callback handler after
a CAN message has been transmitted */
void CAN_tx(uint8_t msg_obj_num){
  return;
}

/*CAN error callback */
/*Function is executed by the Callback handler after
an error has occured on the CAN bus */
void CAN_error(uint32_t error_info){
  return;
}

/*CAN interrupt handler */
/*The CAN interrupt handler must be provided by the user application.
It's function is to call the isr() API located in the ROM */
void CAN_IRQHandler (void){
  (*rom)->pCAND->isr();
}

/* CANopen Callback for expedited read accesses */
uint32_t CANOPEN_sdo_exp_read(uint16_t index, uint8_t subindex){
if (index == 0x2001)
param++;

return 0;  // Return 0 for successs, SDO Abort code for error
}

/* CANopen Callback for expedited write accesses */
uint32_t CANOPEN_sdo_exp_write(uint16_t index, uint8_t subindex, uint8_t *dat_ptr){
  if ((index == 0x2001) && (*(uint16_t *)dat_ptr != 0))
    return SDO_ABORT_VALUE_RANGE;
  else
    return 0;  // Return 0 for successs, SDO Abort code for error
}


int main(void) {



/* Output the Clk onto the CLKOUT Pin PIO0_1 to monitor the freq on a scope */
LPC_IOCON->PIO0_1= (1<<0);
/* Select the MAIN clock as the clock out selection since it's driving the core */
LPC_SYSCON->CLKOUTCLKSEL = 3;
/* Set CLKOUTDIV to 6 */
LPC_SYSCON->CLKOUTDIV = 10;//CLKOUT Divider = 10
/* Enable CLKOUT */
LPC_SYSCON->CLKOUTUEN = 0;
LPC_SYSCON->CLKOUTUEN = 1;
while (!(LPC_SYSCON->CLKOUTUEN & 0x01));

/* Initialize the CAN controller */
(*rom)->pCAND->init_can(&ClkInitTable[0], 1);

/* Configure the CAN callback functions */
(*rom)->pCAND->config_calb(&callbacks);

/* Initialize CANopen handler and variables */
error_register = 0x00;
device_id      = 0xAA55AA54;
fw_ver         = 0x00010002;
param          = 33;
(*rom)->pCAND->config_canopen((CAN_CANOPENCFG *)&myCANopen);

/* Enable the CAN Interrupt */
NVIC_EnableIRQ(CAN_IRQn);

/* Send a simple one time CAN message */

msg_obj.msgobj  = 0;
msg_obj.mode_id = 0x345;
msg_obj.mask    = 0x0;
msg_obj.dlc     = 4;
msg_obj.data[0] = 'T';//0x54
msg_obj.data[1] = 'E';//0x45
msg_obj.data[2] = 'S';//0x53
msg_obj.data[3] = 'T';//0x54
(*rom)->pCAND->can_transmit(&msg_obj);

/* Configure message object 1 to receive all 11-bit messages 0x400-0x4FF */
msg_obj.msgobj = 1;
msg_obj.mode_id = 0x400;
msg_obj.mask = 0x700;
(*rom)->pCAND->config_rxmsgobj(&msg_obj);

while(1){
(*rom)->pCAND->config_rxmsgobj(&msg_obj);
__WFI();/* Go to Sleep */
}
}

I have two LPCXpresso Board with Target LPC11C24, and simply I want to connect them via CANopen .

[lpcware]

Content originally posted in LPCWare by R2D2 on Tue May 21 05:27:24 MST 2013

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Quote: Ronbra
p.s. in lpcXpresso there are a sample code, I modified it and connected two lpc11c24 but it' not working.

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#1 There are samples in you Example folder, try them.

#2 Connecting LPC11C24 via CAN means connecting CAN-H and CAN-L, that's all. I'm not sure which hardware we are talking about (LPCXpresso11C24 ?) and if there's a termination somewhere in your bus.

[lpcware]

Content originally posted in LPCWare by Ronbra on Tue May 21 05:07:15 MST 2013

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Quote: R2D2
I'm not sure what we are talking about. LPC11C24 is including a transceiver and can be connected as CAN-device as usual.

'Zero' has written several posts about CAN and LPC11Cxx like this http://knowledgebase.nxp.com/showthread.php?p=21853#post21853

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Thank you for reply, I checked 'Zero' posts about CAN, but I want to know in detail about wiring and communicating two lpc11c24 not just ram solutions.

Please if anybody has a schematic and code, please post it.

p.s. in lpcXpresso there are a sample code, I modified it and connected two lpc11c24 but it' not working.

[lpcware]

Content originally posted in LPCWare by R2D2 on Mon May 20 08:07:14 MST 2013

---

Quote: Ronbra
Hi,
Can you tell me how to connect two lpc11c24 with C_CAN with on-chip or CANopen, and how to communicate with each-other ???

---

I'm not sure what we are talking about. LPC11C24 is including a transceiver and can be connected as CAN-device as usual.

'Zero' has written several posts about CAN and LPC11Cxx like this http://knowledgebase.nxp.com/showthread.php?p=21853#post21853