Accelerate your CAN applications with ATA6571 and STM32L073RZ
The road to efficiency starts with our HS CAN
Published Feb 26, 2024
Click board™
ATA6571 Click
Dev. board
Nucleo-64 with STM32L073RZ MCU
Compiler
NECTO Studio
MCU
STM32L073RZ
Experience the future of high-speed communication with our cutting-edge CAN FD transceiver solution
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Hardware Overview
How does it work?
ATA6571 Click is based on the ATA6571, a standalone high-speed CAN FD transceiver up to 5 Mbit/s that interfaces a Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus from Microchip. It offers improved Electromagnetic Compatibility (EMC) and ESD performance. Its advanced low-power management with local and remote Wake-Up support makes achieving low current consumption in Standby and Sleep mode possible, even when the internal I/O and transceiver supplies are switched off. The ATA6571 supports functional safety-related applications. Internal Safety Mechanisms prevent device malfunction due to undervoltage and overtemperature, detect bus dominant and recessive clamping, and prevent blocking of the CAN bus due to permanent dominant or recessive states of RXD and TXD. The ATA6571 has one pin for waking the device from Sleep mode. This pin is connected to a WAKE external switch to generate a local Wake-Up function. A Wake-Up event on the
CAN bus switches the inhibit output pin INH to the High level. The INH pin provides an internal switch towards the battery supply voltage and controls external voltage regulators, the MCP1804 from Microchip. Through SMD jumpers labeled as JMP3V3 and JMP5V, the LDO's output voltages can power up the mikroBUS™ 3.3V and 5V power rails. However, it should be noted that MIKROE does not advise powering up their systems this way. That is why these jumpers are left unpopulated by default. The ATA6571 communicates with MCU using the UART interface with the default baud rate of 9600 bps for data transfer. In addition to UART communication pins from the mikroBUS™ socket, the user can connect the TX/RX signals directly through the UART External header on the board's left edge. This Click board™ comes equipped with the standard DB-9 connector, making interfacing with the CAN bus simple and easy. Besides, the user can connect the CAN signals directly through the CAN External header, also on the board's left
edge. In addition to these features, the ATA6571 uses several GPIO pins connected to the mikroBUS™ socket. The EN pin routed on the CS pin of the mikroBUS™ is used for Enable Control. Together with the STB pin routed on the AN pin of the mikroBUS™ socket, which represents Standby Mode Control, the EN pin controls the device's operating mode. It also provides a pull-down to force the transceiver into Recessive mode if EN is disconnected. Next to these pins, the ATA6571 uses another pin labeled ERR routed on the RST pin of the mikroBUS™ used as Error Indication. This pin reflects the device status and can be visually displayed using the LED indicator labeled as ERR. This Click board™ is designed to operate with both 3.3V and 5V logic voltage levels selected via the VIO SEL jumper. It allows both 3.3V and 5V capable MCUs to use the UART 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
Nucleo-64 with STM32L073RZ MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin
headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is
provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
192
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
20480
You complete me!
Accessories
Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 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 STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
DB9 Cable Female-to-Female (2m) cable is essential for establishing dependable serial data connections between devices. With its DB9 female connectors on both ends, this cable enables a seamless link between various equipment, such as computers, routers, switches, and other serial devices. Measuring 2 meters in length, it offers flexibility in arranging your setup without compromising data transmission quality. Crafted with precision, this cable ensures consistent and reliable data exchange, making it suitable for industrial applications, office environments, and home setups. Whether configuring networking equipment, accessing console ports, or utilizing serial peripherals, this cable's durable construction and robust connectors guarantee a stable connection. Simplify your data communication needs with the 2m DB9 female-to-female cable, an efficient solution designed to meet your serial connectivity requirements easily and efficiently.
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 Nucleo-64 with STM32L073RZ MCU as your development board.
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for ATA6571 Click driver.
Key functions:
ata6571_set_operating_mode- This function sets the device operating mode by controlling the EN and NSTB pinsata6571_generic_write- This function writes a desired number of data bytes by using UART serial interfaceata6571_generic_read- This function reads a desired number of data bytes by using UART serial interface
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 main.c
* @brief ATA6571 Click Example.
*
* # Description
* This example reads and processes data from ATA6571 clicks.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and sets the device operating mode.
*
* ## Application Task
* Depending on the selected demo application mode, it reads all the received data or
* sends the desired message every 2 seconds.
*
* ## Additional Function
* - static void ata6571_clear_app_buf ( void )
* - static err_t ata6571_process ( void )
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "ata6571.h"
#define PROCESS_BUFFER_SIZE 200
/*** Demo application mode selection, only one mode should be selected at the same time ***/
#define DEMO_APP_RECEIVER
// #define DEMO_APP_TRANSMITTER
#define TEXT_TO_SEND "MikroE - ATA6571 click board\r\n"
static ata6571_t ata6571;
static log_t logger;
static char app_buf[ PROCESS_BUFFER_SIZE ] = { 0 };
static int32_t app_buf_len = 0;
static int32_t app_buf_cnt = 0;
/**
* @brief ATA6571 clearing application buffer.
* @details This function clears memory of application buffer and reset it's length and counter.
* @note None.
*/
static void ata6571_clear_app_buf ( void );
/**
* @brief ATA6571 data reading function.
* @details This function reads data from device and concatenates data to application buffer.
*
* @return @li @c 0 - Read some data.
* @li @c -1 - Nothing is read.
* @li @c -2 - Application buffer overflow.
*
* See #err_t definition for detailed explanation.
* @note None.
*/
static err_t ata6571_process ( void );
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
ata6571_cfg_t ata6571_cfg; /**< Click config object. */
/**
* 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 );
Delay_ms( 100 );
log_info( &logger, " Application Init " );
// Click initialization.
ata6571_cfg_setup( &ata6571_cfg );
ATA6571_MAP_MIKROBUS( ata6571_cfg, MIKROBUS_1 );
err_t init_flag = ata6571_init( &ata6571, &ata6571_cfg );
if ( UART_ERROR == init_flag )
{
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
Delay_ms( 100 );
#ifdef DEMO_APP_RECEIVER
log_printf( &logger, "---- RECEIVER MODE ----\r\n" );
#endif
#ifdef DEMO_APP_TRANSMITTER
log_printf( &logger, "---- TRANSMITTER MODE ----\r\n" );
#endif
ata6571_set_operating_mode ( &ata6571, ATA6571_OPERATING_MODE_NORMAL );
app_buf_len = 0;
app_buf_cnt = 0;
log_info( &logger, " Application Task " );
Delay_ms( 100 );
}
void application_task ( void )
{
#ifdef DEMO_APP_RECEIVER
ata6571_process();
if ( app_buf_len > 0 )
{
Delay_ms( 100 );
ata6571_process();
log_printf( &logger, "%s", app_buf );
log_printf( &logger, "-------------------------------------\r\n" );
ata6571_clear_app_buf( );
}
#endif
#ifdef DEMO_APP_TRANSMITTER
ata6571_generic_write( &ata6571, TEXT_TO_SEND, strlen( TEXT_TO_SEND ) );
log_printf( &logger, "---- The message has been sent ----\r\n" );
Delay_ms( 2000 );
#endif
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
static void ata6571_clear_app_buf ( void )
{
memset( app_buf, 0, app_buf_len );
app_buf_len = 0;
app_buf_cnt = 0;
}
static err_t ata6571_process ( void )
{
int32_t rx_size;
char rx_buff[ PROCESS_BUFFER_SIZE ] = { 0 };
rx_size = ata6571_generic_read( &ata6571, rx_buff, PROCESS_BUFFER_SIZE );
if ( rx_size > 0 )
{
int32_t buf_cnt = 0;
if ( app_buf_len + rx_size >= PROCESS_BUFFER_SIZE )
{
ata6571_clear_app_buf( );
return ATA6571_ERROR;
}
else
{
buf_cnt = app_buf_len;
app_buf_len += rx_size;
}
for ( int32_t rx_cnt = 0; rx_cnt < rx_size; rx_cnt++ )
{
if ( rx_buff[ rx_cnt ] != 0 )
{
app_buf[ ( buf_cnt + rx_cnt ) ] = rx_buff[ rx_cnt ];
}
else
{
app_buf_len--;
buf_cnt--;
}
}
return ATA6571_OK;
}
return ATA6571_ERROR;
}
// ------------------------------------------------------------------------ END
