Rely on TLE7259-3 and ATmega328P to ensure reliable communication on the LIN bus
LIN transceivers: The silent heroes of modern vehicle and industrial systems
Published Feb 14, 2024
Click board™
LIN Click
Dev Board
Arduino UNO Rev3
Compiler
NECTO Studio
MCU
ATmega328P
Trust in our LIN transceiver for robust real-time monitoring and control in demanding industrial environments, ensuring precision and uptime.
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Hardware Overview
How does it work?
LIN Click is based on the TLE7259-3, a LIN transceiver with an integrated wake-up feature from Infineon Technologies. The TLE7259-3 operates as a bus driver between the protocol controller and the physical LIN bus designed for in-vehicle networks using data transmission rates from 2.4kbps to 20kbps. It is compliant with all LIN standards and has built-in protection features against over-voltage and overtemperature conditions and a wide operating supply range, making the TLE7259-3 ideal for various automotive applications. LIN Click communicates with MCU using the UART interface with commonly used UART RX and TX pins at 9600 bps by default configuration to transmit and exchange data with the host MCU. The transmit data stream on the TX input is converted to a LIN bus signal with an optimized slew rate, while the RX output reads back the information from the LIN bus to the MCU. The receiver also has an integrated filter network
to suppress noise on the LIN bus and increase the transceiver's EMI (Electromagnetic immunity) level. This Click board™ provides the ability to work in both Host or Peripheral mode, where selection can be performed by onboard SMD jumper labeled as MODE to an appropriate position. The TLE7259-3 also operates in three major operational modes: Stand-by, Normal, and Sleep mode, selected by the logic state of the enable pin labeled as EN and routed to the CS pin of the mikroBUS™ socket. In Normal Operation mode, the LIN bus receiver and the LIN bus transmitter are active, whereby communication occurs as usual, while in the Stand-by mode, no communication on the LIN bus is possible. Sleep mode significantly reduces the current consumption of the TLE7259-3. The LIN bus also has a wake-up event often called remote Wake-Up, a falling edge on the LIN bus followed by a specific duration, resulting in a wake-up event
that changes the operation mode from Sleep mode to Stand-by mode. Besides the remote wake-up, a wake-up of the TLE7259-3 via the WK pin routed to the PWM pin of the mikroBUS™ socket is possible, called local wake-up. This Click board™ supports an external power supply connected to the input terminal labeled as VS and should be within the range of 5.5V to 27V, suitable for both 12V and 24V board net, while the LIN bus line can be connected to the terminal labeled as BUS. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.
Features overview
Development board
Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an
ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the
first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.
Microcontroller Overview
MCU Card / MCU
Architecture
AVR
MCU Memory (KB)
32
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
You complete me!
Accessories
Click Shield for Arduino UNO has two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the Arduino UNO board without effort. The Arduino Uno, a microcontroller board based on the ATmega328P, provides an affordable and flexible way for users to try out new concepts and build prototypes with the ATmega328P microcontroller from various combinations of performance, power consumption, and features. The Arduino Uno has 14 digital input/output pins (of which six can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and reset button. Most of the ATmega328P microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the Arduino UNO board with our Click Shield for Arduino UNO, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Arduino UNO Rev3 as your development board.
Track your results in real time
Application Output
This Click board can be interfaced and monitored in two ways:
Application Output- Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
UART Terminal- Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.
Software Support
Library Description
This library contains API for LIN Click driver.
Key functions:
lin_generic_write- Generic write functionlin_generic_read- Generic read functionlin_set_enable- Set enable pin state.
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* \file
* \brief Lin Click example
*
* # Description
* This example reads and processes data from LIN clicks.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and makes an initial log.
*
* ## Application Task
* Depending on the selected mode, it reads all the received data or sends the desired message
* every 2 seconds.
*
* ## Additional Function
* - lin_process ( ) - The general process of collecting the received data.
*
* @note
* Make sure to set the onboard Master/Slave jumpers properly and to connect and power two click
* boards according to LIN Specification 2.2A.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "lin.h"
#include "string.h"
#define PROCESS_RX_BUFFER_SIZE 500
#define TEXT_TO_SEND "MikroE - LIN click board\r\n"
#define DEMO_APP_RECEIVER
// #define DEMO_APP_TRANSMITTER
// ------------------------------------------------------------------ VARIABLES
static lin_t lin;
static log_t logger;
// ------------------------------------------------------- ADDITIONAL FUNCTIONS
static void lin_process ( void )
{
int32_t rsp_size;
char uart_rx_buffer[ PROCESS_RX_BUFFER_SIZE ] = { 0 };
rsp_size = lin_generic_read( &lin, uart_rx_buffer, PROCESS_RX_BUFFER_SIZE );
if ( rsp_size > 0 )
{
for ( uint8_t cnt = 0; cnt < rsp_size; cnt++ )
{
log_printf( &logger, "%c", uart_rx_buffer[ cnt ] );
if ( uart_rx_buffer[ cnt ] == '\n' )
{
log_printf( &logger, "---------------------------\r\n" );
}
}
}
}
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
lin_cfg_t cfg;
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
// Click initialization.
lin_cfg_setup( &cfg );
LIN_MAP_MIKROBUS( cfg, MIKROBUS_1 );
lin_init( &lin, &cfg );
Delay_ms ( 100 );
lin_set_enable ( &lin, 1 );
lin_set_wake_up ( &lin, 0 );
Delay_ms ( 100 );
#ifdef DEMO_APP_RECEIVER
log_info( &logger, "---- Receiver mode ----" );
#endif
#ifdef DEMO_APP_TRANSMITTER
log_info( &logger, "---- Transmitter mode ----" );
#endif
}
void application_task ( void )
{
#ifdef DEMO_APP_RECEIVER
lin_process( );
#endif
#ifdef DEMO_APP_TRANSMITTER
lin_generic_write( &lin, TEXT_TO_SEND, strlen( TEXT_TO_SEND ) );
log_info( &logger, "---- Data sent ----" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
#endif
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
/*!
* \file
* \brief Lin Click example
*
* # Description
* This example reads and processes data from LIN clicks.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and makes an initial log.
*
* ## Application Task
* Depending on the selected mode, it reads all the received data or sends the desired message
* every 2 seconds.
*
* ## Additional Function
* - lin_process ( ) - The general process of collecting the received data.
*
* @note
* Make sure to set the onboard Master/Slave jumpers properly and to connect and power two click
* boards according to LIN Specification 2.2A.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "lin.h"
#include "string.h"
#define PROCESS_RX_BUFFER_SIZE 500
#define TEXT_TO_SEND "MikroE - LIN click board\r\n"
#define DEMO_APP_RECEIVER
// #define DEMO_APP_TRANSMITTER
// ------------------------------------------------------------------ VARIABLES
static lin_t lin;
static log_t logger;
// ------------------------------------------------------- ADDITIONAL FUNCTIONS
static void lin_process ( void )
{
int32_t rsp_size;
char uart_rx_buffer[ PROCESS_RX_BUFFER_SIZE ] = { 0 };
rsp_size = lin_generic_read( &lin, uart_rx_buffer, PROCESS_RX_BUFFER_SIZE );
if ( rsp_size > 0 )
{
for ( uint8_t cnt = 0; cnt < rsp_size; cnt++ )
{
log_printf( &logger, "%c", uart_rx_buffer[ cnt ] );
if ( uart_rx_buffer[ cnt ] == '\n' )
{
log_printf( &logger, "---------------------------\r\n" );
}
}
}
}
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
lin_cfg_t cfg;
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
// Click initialization.
lin_cfg_setup( &cfg );
LIN_MAP_MIKROBUS( cfg, MIKROBUS_1 );
lin_init( &lin, &cfg );
Delay_ms ( 100 );
lin_set_enable ( &lin, 1 );
lin_set_wake_up ( &lin, 0 );
Delay_ms ( 100 );
#ifdef DEMO_APP_RECEIVER
log_info( &logger, "---- Receiver mode ----" );
#endif
#ifdef DEMO_APP_TRANSMITTER
log_info( &logger, "---- Transmitter mode ----" );
#endif
}
void application_task ( void )
{
#ifdef DEMO_APP_RECEIVER
lin_process( );
#endif
#ifdef DEMO_APP_TRANSMITTER
lin_generic_write( &lin, TEXT_TO_SEND, strlen( TEXT_TO_SEND ) );
log_info( &logger, "---- Data sent ----" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
#endif
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
