LIN communication with STM8A-DISCOVERY
Contents
1. e SPI which is used in master mode at 250 kHz to initialize the L99PM62GPX and refresh its watchdog e ADC which is used to read the RV1 trimmer value e TIM4 which allows generation of a 1 ms timebase e HSE the High Speed External Clock which when enabled allows the use of the external 16 MHz crystal oscillator e LINUART which is used to perform LIN communication in master mode e GPIO PAS PD3 PDO PE3 and PC3 ports are used for LED display PE2 and PE1 are used for USER1 and USER2 push buttons PC7 PC6 PC5 and PES are used respectively for the SPI MISO MOSI SCK and NSS PD5 and PD6 are used for LINART TX and RX Software modules main This module contains the initialization routines and the main loop appli This module contains the application s main tasks e reading the status of the USER1 and USER2 buttons and updating the corresponding signals in the LIN frame that will be sent to the STM8AL board e reading the value of the RV1 trimmer thanks to the ADC peripheral and updating the corresponding signal in the LIN frame that will be sent to the STM8AL board e updating the status of the LEDs according to the signals read in the LIN frame received from the STM8AL board If the LIN communication is broken the application will switch on the red LD3 LED I99pme2drv This module contains the driver for the LO9PM62GXP device which is controlled by the STM8AF microcontroller through S2. v AN4101 Sf Application note LIN communication with STM8A DISCOVERY Introduction The purpose of this application note is to describe the LIN demonstration that is delivered with the STM8A DISCOVERY The software running in the STM8AF microcontroller configures the STM8AF board as a basic LIN master node while the software in the STM8AL microcontroller sets the STM8AL board as a basic LIN slave node Each board is connected through a single wire LIN bus thanks to the LIN transceivers embedded in the L99PM62GXP device This document is organized as follows m Chapter 2 gives a short introduction to the LIN bus standard m Chapter 3 briefly describes the LIN transceiver of the LO9PM62GXP m Chapter 4 Chapter 5 and Chapter 6 describe the different UART implementations found in the STM8AL and STM8AF microcontroller families and explain the principle of a basic software LIN driver in master or slave mode Chapter 7 describes the demonstration software delivered with the STM8A DISCOVERY which uses some of the basic LIN drivers from Chapter 4 and Chapter 5 You can also refer to AN4178 for an example of the STM8AF board in slave mode using the driver described in Chapter 6 All these examples can be used as references for understanding how to configure USART and LINUART and for implementing your own LIN driver in the STM8AF and STM8AL microcontrollers Note A LIN Software Package and a J2602 Software Package
3. RxD_C MSv31516V1 Doc ID 23127 Rev 1 ky AN4101 Implementing a LIN master node with STM8AF board 4 Implementing a LIN master node with STM8AF board 4 1 STM8AF microcontroller LINUART and USART features for LIN master The LINUART and USART inside the STM8AF microcontroller implement both generation and detection of LIN Breaks LIN Break generation allows sending of 13 bit Breaks on the TX pin thanks to the LIN protocol requirement LIN Break detection allows detection of feedback from the LIN transceiver before the Synch Field 55h data byte transmission is requested on the TX pin There is a dedicated flag LBDF which may or may not trigger the receive interrupt depending on the LBDIE bit configuration 4 2 Software algorithm The software algorithm described below is implemented in the demonstration software of the STM8A DISCOVERY STM8AF microcontroller Refer to Section 7 2 STM8AF software description for details 4 2 1 LIN state machine The LIN task is called regularly by the main routine This task is a basic LIN master driver that implements a state machine with the following states e idle e Break e SynchField e Identifier e DataReception e Datalransmission 4 2 2 LINUART interrupt The LINUART interrupt reads and clears the hardware flags in the LINUART registers and sets the appropriate software flags to allow transitions in the basic LIN driver state machine e BreakReceived which is set if the break d
4. are available for free from STMicroelectronics as detailed in Chapter 8 Table 1 Applicable products Type Part numbers STM8AF5xxx STM8AF6x26 4x 66 68 STM8AF6x69 7x 8x 9x Ax Microcontrollers STM8AL313x STM8AL314x STM8AL31 6x STM8AL3L4x STM8AL3L6x STM8A DISCOVERY December 2012 Doc ID 23127 Rev 1 1 21 www st com Contents AN4101 Contents 1 Related documents 0 000 eee eee ee ees 4 2 Introduction to the LIN bus 0 eee ee 5 2 1 LIN consortium 00 00 lle ee ee ee 4c 443 5 2 2 LIN prin iple ss xor AR ER URS Sx b E AES S RENS cae wae EE 5 2 3 GON ANTS eset ets ess tects ack ee E Beak svat de Blogs a aves sta Rreweel Gr Ra nD Hanae BO 6 2 4 LIN physical layer cu owe cad ex wee era eee ee eee ies ede ewe Seaweed 7 3 LIN transceiver 0 0 ce ees 8 4 Implementing a LIN master node with STM8AF board 9 4 1 STMB8AF microcontroller LINUART and USART features for LIN master 9 4 2 Software algorithm canon tas cneeeeseseeta eeee danas ekewaaee nestor 9 4 2 1 LIN state machine 0 0 0000 ee ee 9 4 2 2 LINUART interrupt ss icta prea e aa n eee 9 5 Implementing a LIN slave node with STM8AF board 10 5 1 STMB8AF microcontroller LINUART features for LIN slave 10 5 2 Software algorithm was deae RE aep m3 Prensa RE ERE PER ned 10 5 2 1 LIN state Machine sodomi sns de cia cv brad A RPSReEERIRREEE EG 10 5 2 2 LINUART interrupt lllslsseel
5. clears the hardware flags in the LINUART registers and sets the appropriate software flags to allow transitions in the basic LIN driver state machine e BreakReceived which is set if both of the following conditions are met a data byte with the value OOh is in the data register DR the framing error flag FE is set e DataReceived which is set if the RXNE flag is set e ReceptionError which is set if the framing error flag FE or the overrun flag OR is set Doc ID 23127 Rev 1 ky AN4101 LIN demonstration software 7 LIN demonstration software STM8A DISCOVERY contains all you need to start a basic LIN communication e STMS8AF board with the following aSTMS8AFB5288 microcontroller a amp LIN transceiver push buttons LEDs aSTLINK V2 for debugging and programming e STMS8AL board with the following aSTM8AL3L68 microcontroller a amp LIN transceiver push buttons LEDs aLCD display aST LINK V2 for debugging and programming e Dualtype A to mini B USB cable to connect the boards to your PC The following sections introduce the demonstration software running in the STM8AL and STMBAF boards This application does not require any additional hardware Once the STM8A DISCOVERY is powered up through the dual type A to mini B USB cable connected to the host PC the application is ready to start LIN communication and updates the LEDs and LCD display according to the user s actio
6. e the Protected Identifier field The response consists of e from 1 to 8 bytes of data e 1 checksum byte Figure 2 LIN frame header and response Frame Header Response EI Response space p d d Break Sync Protected Data 1 Data 2 Data N Checksum field field identifier field P lt gt H r r Inter byte space Inter byte spaces MSv31514V1 The header is always sent by the master node The response is sent by only one node either the master node or one of the slave nodes The node sending a frame response is called the publisher There is always only one publisher for each frame A node interested in a frame response is called a subscriber There can be several subscribers for a frame Doc ID 23127 Rev 1 ky AN4101 Introduction to the LIN bus 2 4 LIN physical layer The LIN bus is single wire and is connected via a pull up resistor to the battery voltage Vpat The LIN transceiver is an enhancement of the ISO 9141 standard There are two possible bus states e dominant recessive The LIN bus does not need to resolve bus collisions since only one message is allowed on the bus at a time This guarantees a deterministic system with known latency times The default state is recessive A dominant state occurs when the transmitter pulls down the bus line All LIN transmitters operate as and gates which means that they
7. the appropriate software flags to allow transitions in the basic LIN driver state machine HeaderReceived which is set if the header detection flag LHDF is set in the interrupt routine DataReceived which is set if the RXNE flag is set IdentifierParityError which might be set if the header detection flag is set after first checking the parity flag ReceptionError which is set if the case framing error flag FE the overrun flag OR or the LIN synchro flag LSF is set Doc ID 23127 Rev 1 11 21 Implementing a LIN slave node with STM8AL board AN4101 6 6 1 6 2 6 2 1 6 2 2 12 21 Implementing a LIN slave node with STM8AL board STM8AL microcontroller USART features USART does not embed any particular LIN features A LIN slave node can be implemented by building a break detection based on a 00h data reception with a framing error FE flag An external resonator or crystal is required in order to meet the 1 5 maximum clock deviation allowed by the LIN standard Software algorithm The software algorithm described below is implemented in the demonstration software of the STM8A DISCOVERY STM8AL microcontroller LIN state machine The LIN task is called regularly by the main routine This task is a basic LIN slave driver that implements a state machine with the following states Idle Break SynchField Identifier DataReception DataTransmission LINUART interrupt The LINUART interrupt reads and
8. AN4102 for a description of these modules stm8l15x it This module contains the following interrupt routines e External interrupt of the pin1 routine and update of the UserButton1 software flag when a falling edge is detected on the PE1 port e External interrupt of the pin2 routine and update of the UserButton2 software flag when a falling edge is detected on the PE2 port e External interrupt of the pin6 routine which is not activated in the demonstration software test mode only e TIM4 interrupt routine which sets timebase ticks for LIN CAN not used in the demonstration software application and LO9PM62GXP watchdog refresh e USART receive error interrupt routine which implements the algorithm described in Section 6 2 2 LINUART interrupt STM8L15x 16x standard peripheral library modules The demonstration software is based on the STM8L15x 16x standard peripheral library version 1 5 0 dated May 2011 The following driver modules are used e stm8l15x_flash c used for test mode only e stm8s adc c used for test mode only e stm8li5x exti c for the external interrupts on pin1 and 2 USER1 and USER2 buttons stm8s clk c for configuring clocks and enabling HSE stm8s gpio c for initializing reading and updating all ports stm8s spi c for SPI communication with the LO9PM62GXP device stm8s lcd c for SPI communication with the LO9PM62GXP device stm8s_tim4 c for generating a 1 ms timebase stm8s usart c for ini
9. ORIZED ST REPRESENTATIVES ST PRODUCTS ARE NOT RECOMMENDED AUTHORIZED OR WARRANTED FOR USE IN MILITARY AIR CRAFT SPACE LIFE SAVING OR LIFE SUSTAINING APPLICATIONS NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ST PRODUCTS WHICH ARE NOT SPECIFIED AS AUTOMOTIVE GRADE MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK Resale of ST products with provisions different from the statements and or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever any liability of ST ST and the ST logo are trademarks or registered trademarks of ST in various countries Information in this document supersedes and replaces all information previously supplied The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners 2012 STMicroelectronics All rights reserved STMicroelectronics group of companies Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Philippines Singapore Spain Sweden Switzerland United Kingdom United States of America www st com ky Doc ID 23127 Rev 1 21 21
10. PI If the L99PM62GXP device reports an error to the STM8AF through SPI the software will switch on the red LD3 LED The other LEDs will give additional information as follows e LD4 on SPI error e LD5 on Vg out of range e LD6 on thermal shutdown Doc ID 23127 Rev 1 ky AN4101 LIN demonstration software 7 2 3 Note lin This module contains the LIN driver state machine described in Section 4 2 1 LIN state machine adc This module contains the ADC initialization routine and the function for reading a converted value on the ADC channel 8 mapped on the PE7 port can This module contains the CAN communication functions which are used only by a hidden test mode and are not used in this demonstration software stm8s it This module contains the following interrupt routines e External interrupt of the port E routine and update of the UserButton1 UserButton2 software flag when a falling edge is detected on the PE2 PE1 ports e CANreceive interrupt routine which is not activated in the demonstration software test mode only e LINUART receive error interrupt routine which implements the algorithm described in Section 4 2 2 LINUART interrupt e ADC2interrupt routine which reads the converted value and stores it in the Conversion Value variable e TIM4 interrupt routine which sets timebase ticks for LIN CAN not used in the demonstration software application and LO9PM62GXP watchdog refresh S
11. TMSS A standard peripheral library modules The demonstration software is based on the STM8S A standard peripheral library version 2 1 0 dated November 2011 The following driver modules are used stm8s exti c for the external interrupts on port E USER1 and USER2 buttons stm8s adc2 c for converting the RV1 trimmer value stm8s can c for the CAN test mode not used in the demonstration software stm8s clk c for configuring clocks and enabling HSE stm8s gpio c for initializing reading and updating all ports stm8s spi c for SPI communication with the LO9PM62GXP device stm8s tim4 c for generating a 1 ms timebase stm8s uart3 c for initializing LINUART LINUART is described as UARTS in the RM0016 STM8S and STMB8A reference manual Doc ID 23127 Rev 1 15 21 LIN demonstration software AN4101 7 3 7 3 1 7 3 2 16 21 STM8AL software description STMB8AL peripherals The following STM8AL peripherals are used by the application e SPI which is used in master mode at 250 kHz to initialize the L99PM62GPX and refresh its watchdog e TIM4 which allows generation of a 1 ms timebase e HSE the High Speed External Clock which when enabled allows the use of the external 16 MHz crystal oscillator e USART which is used to perform LIN communication in slave mode e GPIO PE7 and PC7 ports are used for LED display PE1 and PE2 are used for the USER1 and USER2 push buttons PB7 PB6 PB5 and PB4 a
12. afety critical automotive applications for example in the body door roof or seat LIN node functionality mainly involves switches actuators and sensors LIN principle The master node decides when and which frame shall be transferred on the bus Slave nodes simply react when they detect a Break on the bus The master node has control over the whole bus and protocol It decides which message at what time is to be transferred over the bus It also does the error handling For this the master e sends the Header which consists of a Break a Synch byte and an Identifier field e monitors data bytes and checksum bytes to evaluate them for consistency e isthe reference for the clock base The slave node receives or transmits data when an appropriate identifier is sent by the master For this the slave 1 checks the identifier 2 depending on the identifier value determines which of the following to do receive data transmit data do nothing When transmitting the slave sends from 1 to 8 data bytes and 1 checksum byte Doc ID 23127 Rev 1 5 21 Introduction to the LIN bus AN4101 2 3 6 21 LIN frame LIN is based on the standard UART format with 1 start bit 8 data bits LSB first and 1 stop bit Figure 1 LIN frame Byte field GI IMEEEEB The LIN frame is composed of a header and a response MSv31513V1 The header consists of e the Break field e the Synch field
13. equency deviation of the embedded internal RC oscillator HSI may be If one of the following errors is detected during the header reception the software is notified through the LHE flag e resynchronization error if the deviation is greater than 14 e identifier error framing error or parity error e break delimiter error if the delimiter is too short e header timeout if the LIN header is longer than the T HEADER MAX defined in the LIN standard In order to enhance system robustness the LINUART can detect a Break at any time even while receiving a data byte and resynchronizes upon detecting the Break Software algorithm The software algorithm described below is NOT implemented in the demonstration software of the STM8A DISCOVERY Refer to AN4178 to use another piece of demonstration software for the STM8A DISCOVERY running the STM8AF board as a LIN slave The demonstration described in AN4178 is based on two STM8AF boards connected together one a LIN master and the other a LIN slave LIN state machine The LIN task is called regularly by the main routine This task is a basic LIN slave driver that implements a state machine with the following states e idle e Identifier e DataReception e Datalransmission Doc ID 23127 Rev 1 ky AN4101 Implementing a LIN slave node with STM8AF board 5 2 2 LINUART interrupt The LINUART interrupt reads and clears the hardware flags in the LINUART registers and sets
14. etection flag LBDF is set in the interrupt routine e DataReceived which is set if the RXNE flag is set e ReceptionError which is set if the case framing error flag FE or the overrun flag OR is set Doc ID 23127 Rev 1 9 21 Implementing a LIN slave node with STM8AF board AN4101 5 5 1 5 2 Note 5 2 1 10 21 Implementing a LIN slave node with STM8AF board STM8AF microcontroller LINUART features for LIN slave LINUART supports autonomous handling of LIN headers The software is notified of header reception through a dedicated flag LHDF This means that a single interrupt occurs only when the entire header is received including the Break the Synch Field and the Identifier Field LINUART implements a mute mode allowing the software to remain quiet without generating any interrupts until reception of the next header This is very useful for filtering frames for which the STM8AF is neither publisher nor subscriber All data bytes of the frame response will thus be ignored by the LINUART and will not generate any interrupts The automatic resynchronization feature allows a LIN slave to be built with the STM8AF microcontroller without the need for an external crystal oscillator or resonator The LINUART can synchronize on the Synch Field of each received header and automatically adjusts the baudrate prescaler in order to receive and send the rest of the frame with the right frequency tolerance whatever the fr
15. lll RII 11 6 Implementing a LIN slave node with STM8AL board 12 6 1 STMB8AL microcontroller USART features esee 12 6 2 Software algorithm isses cR e ERR ETREREE eee cna pees wees 12 6 2 1 LIN state machine seeee ee eee 12 6 2 2 LINUART interrupt 0 00000 RR Ih 12 7 LIN demonstration software eee eee RR m m nn 13 7 1 tuer ssepe Eense pe CRE E EN E EREA 13 7 2 STMBAF software description saaana enee 14 7 2 1 STMBAF peripherals lsslsseles n 14 7 2 2 Software modules eeeseeee ee eee 14 7 2 3 STM8S A standard peripheral library modules 15 2 21 Doc ID 23127 Rev 1 ky AN4101 Contents 7 3 STM8AL software description 0 0 e eee 16 7 3 1 STMBAL peripherals 0 0000 cee eee 16 7 3 2 Software modules 0000 c eee res 16 7 3 3 STM8L15x 16x standard peripheral library modules 17 7 4 Debugging with ST visual develop STVD sssss 18 7 4 1 Downloading the software tools llllelseleleelesess 18 7 4 2 Opening the workspace and selecting the correct project 18 7 4 3 Rebuilding and debugging the project 02 0 eee eee 18 8 LIN and J2602 software packages 0 cee e cece eee eee 19 9 REVISION history cece enc en sa ee eae eee 0808 G8 ee 20 ky Doc ID 23127 Rev 1 3 21 Related documents AN4101 4 21 Related d
16. must all be in a recessive state for the bus to be in a recessive state In Figure 3 Rx and Tx signals refer to the microcontroller USART or LINUART signals while Veus refers to the LIN bus Figure 3 LIN bus circuit diagram V Shift BAT Master ECU Transceiver IC D ser int VBAT VBAT l VGND ECU V BATTERY V BATTERY V GND_BATTERY D ser_master Vaus C V sup Internal supply for electronics V Shift GND MSv31515V1 Doc ID 23127 Rev 1 7 21 LIN transceiver AN4101 3 8 21 LIN transceiver A LIN transceiver is embedded in the L99PM62 power management integrated circuit which is present on both STM8AF and STMB8AL boards For more information refer to the UM1574 STM8A DISCOVERY user manual and to the L99PM62GXP datasheet Figure 4 LIN transceiver embedded in the L99PM62GXP V1 V2 NReset LIN LINPU RxD_L NINT TxD_L Vs Temp Prewarning amp Shutdown Undervoltage Overvoltage Shutdown 4 channel PWM Generator Window Watchdog High Side d 400mA High Side d 120mA High Side L 120mA High Side d l 120mA High Side A 120mA ES Wake Up In m Wake Up In Wake Up In 0 ISO 11898 2 5 REL 1 REL 2 OP1 OP1 OP1_out OP2 OP2 OP2_out OUT_HS OUT1 OUT2 OUT3 FSO OUT4 WU1 WU2 WU3 CAN Supply CAN_H SPLIT CAN_L TxD_C
17. n with the push buttons and the trimmer This software example comes preloaded with your STM8A DISCOVERY and is readily accessible at application power up Note There are hidden test modes in this demonstration software Consequently the software source code contains additional modules not described in this application note 7 1 Getting started 1 Connect CN3 and CN4 on the STM8AF board to CN3 and CN4 on the STM8AL board 2 Connect both type A connectors of the USB cable to a PC 3 Connect the mini B connector of the USB cable to the STM8AF board All LEDs should blink once on the STM8AF board and twice on the STM8AL board and then the LIN communication starts between both boards 4 Turn the RV1 trimmer on the STM8AF board to adjust the value from 0 to 100 on the STMB8AL board LCD through the LIN bus 5 Push button USER1 on the STM8AF board in order to sequentially display the LCD bars on the STM8AL board through the LIN bus Push button USER2 on the STM8AF board to sequentially switch them off one by one 6 Push button USER1 on the STM8AL board to sequentially switch on green LEDs LD4 LD5 LD6 and LD7 on the STM8AF board through the LIN bus Push button USER2 on the STM8AL board to sequentially switch them off one by one Doc ID 23127 Rev 1 13 21 LIN demonstration software AN4101 7 2 7 2 1 7 2 2 14 21 STM8AF software description STMSAF peripherals The following STM8AF peripherals are used by the application
18. ocuments The following documents are related to this product STM8A DISCOVERY User manual UM1574 STM8AF5xxx STM8AF6x69 7x 8x 9x Ax datasheet STM8AL316x STM8AL314x STM8AL3L6x STM8AL3L4x datasheet STM8S and STM8A microcontroller families Reference Manual RM0016 STM8LO5xx STM8L15xx STM8L162x STM8AL31xx and STM8AL3Lxx microcontroller family reference manual RM0031 L99PM62GXP datasheet LIN communication with two STM8AF boards of STM8A DISCOVERY AN4178 CAN communication with two STM8AF boards of STM8A DISCOVERY AN4179 Doc ID 23127 Rev 1 ky AN4101 Introduction to the LIN bus 2 2 1 2 2 Note Introduction to the LIN bus LIN consortium The LIN consortium was created in 1998 to standardize serial communication in automotive applications LIN complements CAN as a cost effective subnetwork You can get your LIN specification version at http www lin subbus org The key features of LIN are as follows low cost single wire implementation based on ISO9141 and Vgar voltage speed up to 20 Kbps acceptable for many applications limited for EMI reasons a single master multiple slave concept without need for arbitration low cost silicon implementation based on UART self synchronization of slave nodes allowing low cost inaccurate clock source usage guaranteed latency times for signal transmission allowing predictable system design This low price serial communication protocol replaces CAN in various non s
19. oose Set as Active Project Rebuilding and debugging the project You can rebuild the project download the code and debug Make sure to connect the USB cable to the appropriate board Refer to the UM1574 STM8A DISCOVERY User manual for more information on debugging Doc ID 23127 Rev 1 ky AN4101 LIN and J2602 software packages 8 LIN and J2602 software packages This application note and the attached project show how to use the STM8AF and STM8AL features to implement a LIN driver A complete LIN Software Package solution is available for free from STMicroelectronics for STM8AF and STM8AL microcontroller families This software package is compliant with the LIN 1 3 LIN 2 0 and LIN 2 1 standards A J2602 software package is also available for the STM8AF family A LIN 2 1 conformance test and J2602 conformance test have been run by a test house accredited by the LIN consortium Certificates are available at www st com Please refer to UM0941 and UM1583 for more details and contact your STMicroelectronics sales office to get one of these packages Doc ID 23127 Rev 1 19 21 Revision history AN4101 9 20 21 Revision history Table 2 Document revision history Date Revision Changes 03 Dec 2012 1 Initial release Doc ID 23127 Rev 1 AN4101 Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its
20. re used respectively for the SPI MISO MOSI SCK and NSS PC3 and PC2 are used for USART TX and RX Software modules main This module contains the initialization routines and the main loop appli This module contains the application s main tasks e reading the status of the USER1 and USER2 buttons and updating the corresponding signals in the LIN frame that will be sent to the STM8AF board e updating the status of the LEDs according to the signals read in the LIN frame received from the STM8AF board If the LIN communication is broken the application will switch on the red LD3 LED and display ERR2 on the LCD screen I99pme62drv This module contains the driver for the LO9PM62GXP device which is controlled by the STMS8AF microcontroller through SPI If the LO9PM62GXP device reports an error to the STM8AL through SPI the software will display ERR1 on the LCD screen The LCD bars will give additional information as follows e BARO on SPI error e BAR on Vg out of range e BAR2 on thermal shutdown lin This module contains the LIN driver state machine described in Section 6 2 1 LIN state machine Doc ID 23127 Rev 1 ky AN4101 LIN demonstration software 7 3 3 Icd This module contains functions to drive the LCD display delay icc_measure lowpower These modules are used for low power modes They are used by a hidden test mode and are not used in this demonstration software Please refer to
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22. tializing USART Doc ID 23127 Rev 1 17 21 LIN demonstration software AN4101 7 4 7 4 1 7 4 2 7 4 3 18 21 Debugging with ST visual develop STVD Downloading the software tools 1 Download your free software environment IDE Choose between ST s MCU toolset composed of ST Visual Develop STVD and ST Visual Programmer STVP available at http www st com AR Embedded Workbench for STM8 30 day time limited edition available at http www iar com under the Software Download tab 2 Download your free compilers if you chose STVD While IAR Embedded Workbench for STM8 includes its own compiler STVD must be used together with one of the following Cosmic 32 K 1 year time limited edition available at http www cosmicsoftware com download_stm8_32k php Raisonance 32 K available at http www mcu raisonance com Opening the workspace and selecting the correct project Before opening the workspace first unzip the zip file delivered with this application note 1 In ST Visual Develop click File Open Workspace 2 Select the stm8a_discover_workspace stw file in either the Projects STVD cosmic folder or the Projects STVD raisonance folder depending on the compiler you want to use The workspace contains the following projects stm8af_discover stm8al_discover 3 Choose a project by selecting it in the workspace window and right clicking it with the mouse Ch
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