RM46L852: LIN Communication Basic Example

Marvin Gee

Part Number: RM46L852
Other Parts Discussed in Thread: HALCOGEN,

Hi everyone,

we are looking for a basic example for HalCoGen and CCS to run the LIN Bus communication on the RM46L852. We tried the RM57 example but didnt get very far because of the different layout ?

To be a bit more precise we are trying to run the RM46 board as an ECU sending and receiving LIN Messages (with additional LIN transceiver).

Thanks a lot in advance

Marv

over 2 years ago

0 QJ Wang over 2 years ago

TI__Guru**** 186246 points

Hi Marv,

The HALCoGen generates a basic LIN driver. It has several APIs:

But we don't have an application example.

0 Marvin Gee over 2 years ago in reply to QJ Wang

Prodigy 10 points

Hi QJ Wang,

thanks for the fast reply. We got the example with the loopback interrupt runnin.

When we try to implement the LIN functionality to our main project there is an issue with _enable_IRQ() which cant be resolved.. Do we need additional modifications/drívers in HalCoGen?

This is the code:

#include "Project_hska.h"
#include "lin.h"
#include "system.h"
#include "sys_common.h"

/* USER CODE BEGIN (2) */
#define  TSIZE1 8
uint8  TEXT1[TSIZE1]= {'H','E','R','C','U','L','E','S'};
#define  TSIZE2 10
uint8 TEXT2[TSIZE2]= {0};
#define  TSIZE3 19
uint8  TEXT3[TSIZE3]= {'T','E','X','A','S',' ','I','N','S','T','R','U','M','E','N','T','S','\n','\r'};
/* USER CODE END */

uint8   emacAddress[6U] =   {0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU};
uint32  emacPhyAddress  =   0U;

int main(void)
{
/* USER CODE BEGIN (3) */

	canInit();											/* initialize can 1 */
	rtiInit();											/* Initialize RTI driver */
	gioSetDirection(hetPORT1, 0xFFFFFFFF);   			/* Set high end timer GIO port hetPort pin direction to all output */
	rtiEnableNotification(rtiNOTIFICATION_COMPARE0);	/* Enable RTI Compare 0 interrupt notification */
	rtiEnableNotification(rtiNOTIFICATION_COMPARE1);	/* Enable RTI Compare 1 interrupt notification */

		/* Enable IRQ - Clear I flag in CPS register */
	_enable_IRQ();                                     // ohne keine CAN Tx ToDo wo liegt hier der Fehler? enable_IRQ kann nicht gefunden werden..

	rtiStartCounter(rtiCOUNTER_BLOCK0);				/* Start RTI Counter Block 0 */		//500ms Timer
	rtiStartCounter(rtiCOUNTER_BLOCK1);				/* Start RTI Counter Block 1 */		//15 sec Timer

	linSetLength(linREG,7);
	linInit();                                          /* Initialize LIN driver */
	linEnableLoopback(linREG,Digital_Lbk);
	/* Checking that Tx is ready and also if the LIN bus is free (Checking BUSY flag) */
    while((!(linIsTxReady(linREG))) || (linREG->FLR & 0x8U == 0x8U));

    /*Send lin header including sync break field, sync field and identifier. */
    linSendHeader(linREG, 0x28);

    /*Send data TEXT1 */
    linSend(linREG,&TEXT1[0]);

		while(1)
		{
			//wait for interrupt
		}
/* USER CODE END */

    return 0;
}
/* USER CODE BEGIN (4) */
void linNotification(linBASE_t *lin, uint32 flags)
{
    /*Data is read from RD register and stored in TEXT2. */
    if((linREG->FLR & LIN_RX_INT) == LIN_RX_INT)
    {
    linGetData(linREG, TEXT2);
    }
}
/* USER CODE END */

Thanks a lot !

0 QJ Wang over 2 years ago in reply to Marvin Gee

TI__Guru**** 186246 points

Hi Marvin,

There are three "gates" before an interrupt request gets to the CPU:

The module that generates an interrupt request has a register to enable each interrupt that it can generate.
The Vectored Interrupt Manager (VIM) has registers to allow an interrupt request from a module to be forwarded to the CPU as per the priority scheme (lower channel number first).
Finally the CPU itself must be configured to respond to the interrupt requests forwarded by the VIM (IRQ or FIQ).

Please check your code to make sure that the interrupt is enabled:

1. linREG->SETINT

2. LIN channels in VIM table are selected. You can select one of them based on which level (High or Low) is selected in #1

3. IRQ is enabled: _enable_IRQ();

0 Marvin Gee over 2 years ago in reply to QJ Wang

Prodigy 10 points

Hi QJ,

thanks for the reply. Every setting is like you described, still he cant resolve the _enable_IRQ() ..

Are there any header files which are mutually exclusive ?

Thanks a lot

0 QJ Wang over 2 years ago in reply to Marvin Gee

TI__Guru**** 186246 points

The interrupt should be generated after a frame has been received and the data is copied LINRD. Have you resolved the IRQ issue?

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RM46L852: LIN Communication Basic Example