Application Note HAL Programming Guide. Edition Feb. 2, 2010 APN000056_001EN

Transcription

1 Application Note HAL 3625 Edition Feb. 2, 2010 APN000056_001EN

2 HAL 3625 APPLICATION NOTE Copyright, Warranty, and Limitation of Liability The information and data contained in this document are believed to be accurate and reliable. The software and proprietary information contained therein may be protected by copyright, patent, trademark and/or other intellectual property rights of Micronas. All rights not expressly granted remain reserved by Micronas. Micronas assumes no liability for errors and gives no warranty representation or guarantee regarding the suitability of its products for any particular purpose due to these specifications. By this publication, Micronas does not assume responsibility for patent infringements or other rights of third parties which may result from its use. Commercial conditions, product availability and delivery are exclusively subject to the respective order confirmation. Any information and data which may be provided in the document can and do vary in different applications, and actual performance may vary over time. All operating parameters must be validated for each customer application by customers technical experts. Any new issue of this document invalidates previous issues. Micronas reserves the right to review this document and to make changes to the document s content at any time without obligation to notify any person or entity of such revision or changes. For further advice please contact us directly. Do not use our products in life-supporting systems, aviation and aerospace applications! Unless explicitly agreed to otherwise in writing between the parties, Micronas products are not designed, intended or authorized for use as components in systems intended for surgical implants into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the product could create a situation where personal injury or death could occur. No part of this publication may be reproduced, photocopied, stored on a retrieval system or transmitted without the express written consent of Micronas. Micronas Trademarks HAL Third-Party Trademarks All other brand and product names or company names may be trademarks of their respective companies. 2 Feb. 2, 2010; APN000056_001EN Micronas

3 APPLICATION NOTE HAL 3625 Contents Page Section Title 4 1. Introduction Certification Support 5 2. Hardware Installation General Information System Requirements Setup Hardware Setup Application Board Software Setup 7 3. Software Installation Installing HAL 3625 Programming Environment Running HAL 3625 Programming Environment Overview Running the Application Description of the Sheets The General Tab Command Buttons The Calibration Sheet The EEPROM Sheet The Additional Sheet The Info Sheet Programming HAL 3625 Sensor with Own Software Serial Command Interpreter Serial Interface Configuration HAL 3625 Memory Table Programming Interface Bit Definition Definition of the COMMAND frame Definition of the RESPONSE Frame Analog Measurements Error Codes General Application Board Commands HAL 3625-Specific Commands Set Base Address Read Write Protocol Error Handling General Information Programming Information Parity Check HAL CRC Implementation HAL 3625 LabView SubVIs Calculation of CRC Value for Set Base Address Command Calculation of CRC Value for Read Address Command Calculation of CRC Value for Write To Address Command Flowchart Examples Application Note History Micronas Feb. 2, 2010; APN000056_001EN 3

4 HAL 3625 APPLICATION NOTE 1. Introduction 1.1. Certification Micronas GmbH fulfills the requirements of the international automotive standard ISO/TS and is certified according to ISO 9001:2000. this ISO standard is a worldwide accepted quality standard Support In case of questions or problems you can contact the Micronas Application Support for Sensors by calling In addition, we advise you to register on in order to obtain access to the workgroups for our various product families. Then you will receive notifications on software and Application Notes updates. Micronas GmbH - Application Support Sensors Hans-Bunte-Strasse 19 D Freiburg im Breisgau support_sensor@micronas.com 4 Feb. 2, 2010; APN000056_001EN Micronas

5 APPLICATION NOTE HAL Hardware Installation 2.1. General Information This manual guides you through the setup of the hardware and the software of the HAL 3625 Programming Environment for the Application Board HAL-APB V1.3. For further details on the Application Board please see the Application Note Application Board HAL-APB V System Requirements For a properly working programming environment you need a Windows PC with Windows 2000/XP/Vista/7. You can either use a USB cable or a serial cable for connecting the programming board to the COM port of your PC Setup Hardware Setup The hardware package delivered includes: Programming Board HAL-APB V1.3 (optional: housing and rubber stops) Switching Power Supply (AC V 50/60 Hz ; 18 V / 650 ma) High-speed USB 2.0 cable Sensor connector PCB Connector PCB to Programming Board cable Installation CD (or download via Fig. 2 1: Hardware delivery Micronas Feb. 2, 2010; APN000056_001EN 5

6 HAL 3625 APPLICATION NOTE For connecting the HAL-APB V1.3 to the PC please follow these steps: 1. Boot your PC 2. Set the switch at the backside of the HAL-APB V1.3 to the needed position USB 2.0 switch to lower position RS232 switch to upper position 3. Connect the power supply with the programming board and afterwards with the main supply. Note: When connecting, the red ERROR LED and green HAL_ON will flash, then the READY LED turns on 4. Now connect the board via USB 2.0 / RS232 cable with the COM port of your PC. Fig. 2 2: HAL-APB V1.3 backside view (COM port switch) Application Board Software Setup Please insert the installation CD or locate the folder downloaded from on your hard drive. Note: For detailed information please refer to the Application Note Application Board HAL-APB V1.3 6 Feb. 2, 2010; APN000056_001EN Micronas

7 APPLICATION NOTE HAL Software Installation 3.1. Installing HAL 3625 Programming Environment Note: You can get the latest software release and driver or firmware updates when registering on To install the program HAL 3625 Programming Environment for the Application Board HAL-APB V1.3 you need to run the file Setup.exe on the Installation CD or from the downloaded folder. Then please follow the instructions Running HAL 3625 Programming Environment Overview The HAL 3625 Programming Environment is a LabVIEW application which needs Lab- VIEW Runtime Environment 2009 for execution. Each functionality itself is also available as LabView SubVI and can easily be modified or adapted to the individual requirements of customers application. The Runtime Environment 2009 and these SubVIs are also downloadable on The HAL 3625 Programming Environment application shows 5 Index pages. These pages are for faster access to the different functions like modifying register contents, visualizing characteristics and calibrating the device HAL Running the Application After successful installation of the Application Board the application can be started by clicking START >> All Programs >> Micronas >> When starting the application out of the Windows Start Menu the following window (see Fig. 3 3) will appear. This is the Main Window of HAL 3625 Programming Environment from which all important functions can be controlled. The General Sheet enables the user to handle all of the most recent functions. The Calibration Sheet is for doing a 2-point calibration of the HAL 3625 device. The EEPROM Sheet is useful when being interested in the register contents as raw values. Additional Sheet features very low-level communication with the HAL 3625 device as write and read access to an address. On the Info Sheet you find information about hardware and software revisions. In the following sections these tabs will be explained in detail. Micronas Feb. 2, 2010; APN000056_001EN 7

8 HAL 3625 APPLICATION NOTE Fig. 3 3: HAL 3625 programming environment Main Window To run the application press the white arrow in the menu bar (normally application is already running after starting). By pressing the red circle button the application will be stopped. Fig. 3 4: Start / stop execution 8 Feb. 2, 2010; APN000056_001EN Micronas

9 APPLICATION NOTE HAL Description of the Sheets The General Tab Fig. 3 5: HAL 3625 programming environment General Sheet Note: By moving the mouse over an element on the Application Window a popup display appears which explains the function of the element. HAL-APB port After having started the application the correct COM-Port (keep in mind the switch on the backside of the Application Board: down=usb 2.0 / up=rs232) where the Application Board is connected to your PC needs to be selected. Micronas Feb. 2, 2010; APN000056_001EN 9

10 HAL 3625 APPLICATION NOTE Select Mode With the select mode pull-down menu different modes of HAL 3625 communication (optional) can be chosen. Power After that the Power switch on the General Tab must be switched to upper position to supply the HAL device, connected to the Application Board, with power. VBoard LED The VBoard LED indicates the status of the V HAL_SUP. Error LED The Error LED indicates if an error in communication between Application Board and sensor has happened. Characteristics Graph In the characteristics display the sensitivity, offset and clamping levels of the analog output voltage are shown. It represents the behavior of the output when storing the selected parameters into EEPROM. After changing the signalpath parameters it is possible to update the display by clicking on the button update. Status Line In the Board Status display all communication commands and important board settings are displayed. ID Fields The four ID Fields show the values stored in the Customer ID and Micronas ID registers. Signalpath Field The signalpath field contains all parameters which can be changed by customer in the order they apply to the signal path of the sensor. The range of possible input values is displayed when the arrow of the pointer device is located over a certain field. For details on the registers please refer to the data sheet of HAL Data Field The lower neighbor field displays data and angle information which are the calculated values of the signalpath and the measured angle. For details please have a look at the HAL 3625 data sheet. Clamping LEDs The Clamp low and Clamp high LEDs flash if the analog output voltage run into the clamping levels DAC Clamp high / low. Calculated Vout [V] This value is calculated by the HAL 3625 Programming Environment Software it can vary with supply voltage variation and is only for a rough overview of the analog output. For exact values it is necessary to measure with professional measurement equipment like an oscilloscope. 10 Feb. 2, 2010; APN000056_001EN Micronas

11 APPLICATION NOTE HAL Command Buttons READ By clicking this button signalpath parameters and actual signalpath values are read once from the sensor. When setting the switch to continuos Read = on, the reading will continue until the switch is set back to continuos Read = off. WRITE & STORE By clicking this button all parameters shown on the General Page are stored to the sensors memory. REFERENCE By clicking this button the actual angle position is set as new reference point for measuring angle. Restore Default By clicking this button all signalpath parameters are set back to default values. Micronas Feb. 2, 2010; APN000056_001EN 11

12 HAL 3625 APPLICATION NOTE The Calibration Sheet Fig. 3 6: HAL 3625 programming environment Calibration Sheet 12 Feb. 2, 2010; APN000056_001EN Micronas

13 APPLICATION NOTE HAL 3625 This page supports a two-point calibration of the HAL A detailed description on the calculation algorithm of the two-point calibration is given in Section Follow these steps for doing a successful two-point calibration. 1. Restore the default signal path parameters on the General Sheet and store them to the memory. Switch back to Calibration Sheet. 2. Enter the Clamp-low and Clamp-high values as % of V DD (e.g. if V DD = 5V and Clamp-low[%VDD] = 10% than this results in a Clamp-low voltage of 0.5V) into the fields Clamp-low[%VDD] and Clamp-high [%VDD]. 3. Enter the used supply voltage of the sensor into the field VDD [V]. Note: The clamping levels of the sensor are also ratiometric! 4. Move the application to the first calibration point (where 0 angle position is wanted) and press the Reference button. 5. Enter the target output voltage at this 0 angle position into the field Vout min calib. 6. Now turn your application to the second calibration point and click on the button Setpoint2. In the field degrees max calib the corresponding angle will be shown. Specify the target output voltage for this position in the field Vout max calib. By clicking on the button Calculate the best fitting values will be calculated and if the copy values to General field is marked the values are copied to the General page characteristics graph and signalpath displays. Vout min [%VDD] Vout range [%VDD] sensitivity [mv/ ] is the offset (V out at 0 ) of the characteristic line is the range of V out [V] passed when turning the application shows the variation of V out per degree By clicking the button WRITE & STORE all values will be stored to the sensors memory. Micronas Feb. 2, 2010; APN000056_001EN 13

14 HAL 3625 APPLICATION NOTE The EEPROM Sheet Fig. 3 7: HAL 3625 programming environment - EEPROM Dump Sheet This tab is for getting an quick overview on the register values stored in the EEPROM. By clicking the button EEPROM Dump all registers will be read out. In addition this values can be stored to a file. This is helpful for analysis when contacting the technical support. 14 Feb. 2, 2010; APN000056_001EN Micronas

15 APPLICATION NOTE HAL The Additional Sheet Fig. 3 8: HAL 3625 programming environment - Additional Sheet Note: This sheet is for detailed analysis and communication with the device on low level. Handle with care, otherwise the sensor can be damaged! When clicking the button Development Mode the functionalities of read, write and store will appear. On the General Sheet the activation of Development Mode is displayed by a blinking status line. As long as Development Mode is active all other functions are disabled. Set Base Address By clicking this button the register value set as 2-digit hex number in the addr 0x[00-FF] sb field will be set as base address. Read By clicking this button the register value of the address (and the already set base address) specified as 2-digit hex number in addr 0x[00-FF] r will be read out and displayed as decimal and hexadecimal value. In addition the CRC value of the read string is displayed as well. Micronas Feb. 2, 2010; APN000056_001EN 15

16 HAL 3625 APPLICATION NOTE Write & Store The value specified as 4-digit hex number in the field data 0x[xxxx] w will be stored to the register address specified as 2-digit hex number in the field addr 0x[00-FF] w and the as 2-digit hex number specified set base address value addr 0x[00-FF] sb. Further details can be found in section Section The Info Sheet Fig. 3 9: HAL 3625 programming environment Info Sheet This sheet contains release information about the Application Board firmware which is read after switching on power supply. For technical support you can find the contact data here. 16 Feb. 2, 2010; APN000056_001EN Micronas

17 APPLICATION NOTE HAL Programming HAL 3625 Sensor with Own Software 4.1. Serial Command Interpreter The Application Board HAL-APB V1.3 provides a serial command interpreter for the interaction with a PC connected via USB or RS232. The serial communication protocol applies a software handshake: The PC acts as a master, the HAL-APB V1.3 as slave The HAL-APB V1.3 responds to each master COMMAND frame with a RESPONSE frame Serial Interface Configuration The easiest way to set up a communication with the HAL-APB V1.3 is to use the Windows software Hyperterminal. Start the software and specify a connection name, then click OK. Fig. 4 10: Hyperterminal specify connection name Micronas Feb. 2, 2010; APN000056_001EN 17

18 HAL 3625 APPLICATION NOTE Choose the COM port to which the board is connected and confirm again by clicking OK. Fig. 4 11: Hyperterminal choose COM port Change the port settings to the parameters shown in Table 4 1 and click OK. Fig. 4 12: Hyperterminal port settings When setting up a serial interface connection (e.g. with Hyperterminal), you need to set the following parameters. Table 4 1: Parameter COM port parameters Value Bits per second 9600 Data bits 8 Parity even Stop bits 1 Flow control none 18 Feb. 2, 2010; APN000056_001EN Micronas

19 APPLICATION NOTE HAL 3625 Afterwards, open the Hyperterminal properties by clicking File > Properties in the menu bar. Fig. 4 13: Hyperterminal properties In the dialog, switch to the register page Settings and click on the button ASCII Setup. Fig. 4 14: Hyperterminal ASCII Setup In the ASCII setup you need to enable the options, Send line ends... and Echo typed characters... by checking them, to see the data while communication in the hyperterminal window. After successful setup, you will see the return value of F: when typing the return key. Micronas Feb. 2, 2010; APN000056_001EN 19

20 HAL 3625 APPLICATION NOTE 5. HAL 3625 Memory Table Table 5 2: HAL 3625 Memory Table Bank Address High Byte [15:8] Low Byte [7:0] Type Explanation 0x00 0x00 Customer ID 1 Read/ Write 0x00 0x01 Customer ID 2 Read/ Write 0x00 0x02 Gain XY Read/ Write 0x00 0x03 Gain Y Read/ Write 0x00 0x04 Gain X Read/ Write 0x00 0x05 Offset X Read/ Write 0x00 0x06 Offset Y Read/ Write 0x00 0x07 DAC Zero Read/ Write 0x00 0x08 DAC Gain DAC Offset Read/ Write 0x00 0x09 DAC Clamp High DAC Clamp Low Read/ Write free programmable value Range: 0x xFFFF free programmable value Range: 0x xFFFF Phase correction Range: 0x x7FFF (2ths complement) y-gain correction Range: 0x x7FFF (2ths complement) x-gain correction Range: 0x x7FFF (2ths complement) x-offset correction Range: 0x x7FFF (2ths complement) y-offset correction Range: 0x x7FFF (2ths complement) Zero angle adjustment Range: 0x x7FFF (2ths complement) Gain and Offset of Output DAC DAC Gain Range: 0x F DAC Offset Range: 0x x7F (both 2ths complement) Clamping levels of DAC value DAC Clamp high Range: 0x F DAC Clamp low Range: 0x x7F (both 2ths complement) 0x00 0x0A Magnetic Amplitude Low Magnetic Amplitude High Read/ Write Magnetic Compare Level mag. Amplitude low Range: 0x F mag. Amplitude high Range: 0x x7F (both 2ths complement) 0x01 0x04 X Comp Read/ Write 0x01 0x05 Y Comp Read/ Write 0x01 0x06 Cordic X Read/ Write 0x01 0x07 Cordic Y Read/ Write 0x01 0x08 Cordic Angle Read/ Write 0x01 0x09 Cordic Magnitude Read/ Write Compensated x-value Range: 0x x7FFF (2ths complement) Compensated y-value Range: 0x x7FFF (2ths complement) x input value of Cordic Range: 0x x7FFF (2ths complement) y input value of Cordic Range: 0x x7FFF (2ths complement) Cordic output angle Range: 0x x7FFF (2ths complement) Cordic output magnitude Range: 0x x7FFF (2ths complement) 20 Feb. 2, 2010; APN000056_001EN Micronas

21 APPLICATION NOTE HAL Programming Interface 6.1. Bit Definition In Biphase-M Programming Mode the sensor is addressed by modulating a serial telegram on the output voltage. The sensor answers with a modulation of the output voltage. A logical 0 is coded as no level change within the bit time. A logical 1 is coded as a level change of typically 50% of the bit time. After each bit, a level change occurs (see Fig. 6 15). The serial telegram is used to transmit the EEPROM content, error codes and digital values of the magnetic field from and to the sensor. Fig. 6 15: Biphase-M bit definition Definition of the COMMAND frame The command frame is of variable length. There are basically two types of commands: 1. for board configuration 2. for communication with a connected Hall sensor The command string has to end with <CR> (ascii character 0x0D), optionally with <CR><LF> (ascii character 0x0D, 0x0A). Table 6 3: HAL3625 Biphase-M commands Command Code Explanation READ 1 read a register SET BASE ADDRESS 3 set a base address WRITE 6 write a register Micronas Feb. 2, 2010; APN000056_001EN 21

22 HAL 3625 APPLICATION NOTE Fig. 6 16: HAL3625 3wire command structure bidirectional on Vout For further details on the Biphase-M characteristics please refer to the Application Note Application Board HAL-APB V Definition of the RESPONSE Frame The response frame consists of characters plus 1 finishing <LF> <ST>:<R9><R8>...<R2><R1><R0> <LF> ST is non-zero hex character in case of errors (see Table 6 4). This error has to be evaluated in an own software to guarantee correct communication and functionality of the sensor. The Rx-characters contain the received data depending on the command. Please have a look on Table for the command syntax Analog Measurements In case of measuring analog voltages, which are represented as hexadecimal characters, the voltage values need to be calculated like this: V OUT = DATA / 1024 x 5V V DD = DATA / 1024 x 3 x 5V For detailed information about analog measurements please see the Application Note Application Board HAL-APB V Feb. 2, 2010; APN000056_001EN Micronas

23 APPLICATION NOTE HAL Error Codes Table 6 4: Error codes STATUS (hex) Error 0 no error 1 Biphase-M: ACK error 2 Biphase-M: data read error 3 Biphase-M: CAPCOM 4 Biphase-M TPROG select error 5 ADC error: supply voltage level out of spec 6 clock off error 7 Biphase-M: PROG ACK error 8 reserved 9 reserved A B C D E F division by zero error reserved CRC check error data format error unspecified system error invalid command 6.2. General Application Board Commands For detailed information about General Application Board commands please see the Application Note Application Board HAL-APB V HAL 3625-Specific Commands For communication with the HAL 3625 sensor, the following three commands are necessary. Micronas Feb. 2, 2010; APN000056_001EN 23

24 HAL 3625 APPLICATION NOTE Table 6 5: HAL 3625 command syntax Action Command Parameter Remarks write data to address xxwstr STR = ADR1 ADR0 DAT3 DAT2 DAT1 DAT0 CRC address as 2-digit hex No. data as 4-digit hex No. CRC checksum as 1-digit hex No. Example => xxw <= <ST>:<DAT3><DAT2><DAT1><DAT0 ><CRC> <ST> = Status of Board (see Table 6 4 for details) <DAT3-0> = Register data as 4-digit hex value <CRC> = checksum as Table 6 4 hex value see HAL3625 data sheet for register details read data from address xxrstr STR =<ADR1><ADR0> address as 2-digit hex No. Example => xxr10 <= <ST>:<DAT3><DAT2><DAT1><DAT0 ><CRC> <ST> = Status of Board (see Table 6 4 for details) <DAT3-0> = Register data as 4-digit hex value <CRC> = checksum as 1-digit hex value see HAL3625 data sheet for register details set base address xxsbstr STR = <X><X><ADR3><ADR2><ADR1><ADR0><CRC> Example => xxsb111234a <= <ST>:<DAT3><DAT2><DAT1><DAT0 ><CRC> <ST> = Status of Board (see Table 6 4 for details) <DAT3-0> = Acknowledge time as 4- digit hex value <CRC> = checksum as 1-digit hex value 24 Feb. 2, 2010; APN000056_001EN Micronas

25 APPLICATION NOTE HAL Set Base Address The set base address telegram functions as preparation for the write telegram and the read telegram. It uses the write data frame. The base address is defined by WD[15:0] and saved at the register BADR. Bit [15:2] are don t care bit 0 and bit1 are concatenated to the address.the sensor transmits an acknowledge if a communication error has not been detected Read The read telegram uses the read data frame. The sensor transmits the data of the effective address after the header has been successfully received and the effective address is permitted. Otherwise, the sensor does not respond. The effective address is calculated by the base address (register BADR) plus offset address. The offset address is defined by the address bits of the header (A b[4:0]) Write The write telegram uses the write data frame. The sensor saves the received address to the calculated effective address and transmits an acknowledge after the header and body has been successfully received and the effective address is permitted. Otherwise, the command is discarded and the sensor transmits no acknowledge. A write telegram is also discarded while EEPROM programming. During the NVPROM programming sequence, a write command is discarded. Micronas Feb. 2, 2010; APN000056_001EN 25

26 HAL 3625 APPLICATION NOTE 7. Protocol Error Handling 7.1. General Information The sensor detects the following errors: Invalid parity Invalid checksum (CRC) Command error A command error occurs when the command is either unknown or the execution has failed. Note: In case of an error, the sensor transmits no acknowledge and no body. To allow data transmission in rough environments, two separate check mechanisms are implemented. 1. The command and address bits are followed by a common parity bit (see Fig. 7 17). 2. The data bits are always followed by 4 CRC bits. For all commands but read, the CRC result is calculated of all protocol bits, including command, address, parity, and data bits. Note: For a read command, the CRC result is calculated of the data bits only Programming Information For production and qualification tests, it is mandatory to set the LOCK bit after final adjustment and programming of HAL The LOCK function is active after the next power-up of the sensor. The success of the LOCK process should be checked by reading the status of the LOCK bit after locking and/or by an check of the sensors output characteristic via measuring the analog voltage. Electrostatic discharges (ESD) may disturb the programming pulses. Please take precautions against ESD Parity Check For the command and address bits, an odd parity check is used. In the case of an even number of 1 s, the parity bit has to be 1. In the case of an odd number of 1 s, the parity bit has to be 0. With the parity bit, the global parity over the whole protocol is always even. 26 Feb. 2, 2010; APN000056_001EN Micronas

27 APPLICATION NOTE HAL HAL CRC Implementation CRC means cyclic redundancy check which is a method for calculating a test value for detecting errors in transferring or storing data. The HAL 3625 provides this method so customers are able to control communication between PC and sensor very well. The polynomial for the CRC calculation is always X 4 +X+1. The generator block is shown in Fig Note: A C-code DLL library is available for download on service.micronas.com. Also LabView VIs for handling parity and CRC are available. In case of questions please contact the Application Support. In case of correct command detection (parity, CRC and command address if applicable), the Acknowledge bit is sent. Disrupted transfers can be retried by the master. clk bit stream =1 D Q D Q D Q =1 D Q b0 b1 b2 b3 Fig. 7 17: CRC Generator Block Table 7 6: Source code of header file crc.h /* crc.h */ int stdcall calculate_crc(int ndata, int nsize); /* ndata: 16 Bit Bit binary */ /* nsize: */ int stdcall calculate_parity(int CmdAdrField); Micronas Feb. 2, 2010; APN000056_001EN 27

28 HAL 3625 APPLICATION NOTE Table 7 7: sourcecode crc.c #include "crc.h" int stdcall calculate_crc(int ndata, int nsize) { unsigned short bit_in, bit_out, bit_comp, crc; int i; crc = 0; /* initialize crc */ for (i=nsize-1; i>-1; i--) { bit_in = (ndata >> i) & 0x1; /* extract input bit */ bit_out = (crc >> 3) & 0x1; /* extract bit b3 of crc */ bit_comp = (bit_out ^ bit_in) & 0x1; crc = (crc << 1) + bit_comp; /* calculate interrim value of crc */ crc = crc ^ (bit_comp << 1); } crc &= 0xf; return crc; } int stdcall calculate_parity(int CmdAdrField) { int parity = 1; int i; for(i=0;i<8;i++) { parity^=((cmdadrfield&(1<<i))>>i); /* XOR */ } return (int) parity & 0x1; } 28 Feb. 2, 2010; APN000056_001EN Micronas

29 APPLICATION NOTE HAL HAL 3625 LabView SubVIs The following LabView SubVIs are available in Micronas HAL 3625 workgroup ( Calculation of CRC Value for Set Base Address Command This SubVI calculates the CRC value for a set base address command. As input you need to specify the base address as a decimal value which you want to set (e.g. bank0=0, bank1=1). When running this VI the parity bit (as decimal string) and the CRC value (as hexadecimal string) will be calculated and displayed. The calculated CRC value needs to be attached to the set base address command as last character for successful setting a new base address of the HAL Fig. 8 18: Front-panel view of calculate_crc_set_base.vi Fig. 8 19: Block diagram view of calculate_crc_set_base.vi Micronas Feb. 2, 2010; APN000056_001EN 29

30 HAL 3625 APPLICATION NOTE Calculation of CRC Value for Read Address Command This SubVI calculates the CRC value for a read address command. When reading data from an address the last character in return string is the CRC value generated by the sensor. To check wether the data is correct you need to calculate the CRC out of the data send back. Therefor, as input for the SubVI you need to specify the data as a decimal value which was read back (e.g. 0xA324=41764). When running this VI the CRC value (as decimal string) will be calculated and displayed. If the calculated CRC and the returned CRC are not equal there has been an error in transmission of data. Fig. 8 20: Front-panel view of calculate_crc_read.vi Fig. 8 21: Block diagram view of calculate_crc_read.vi 30 Feb. 2, 2010; APN000056_001EN Micronas

31 APPLICATION NOTE HAL Calculation of CRC Value for Write To Address Command This SubVI calculates the CRC value for a write to address command. When writing data to an address the CRC value needs to be send as last character of the send string. This value will be internally compared to the CRC value calculated by the sensor out of the received data. As input for this SubVI you need to specify the address as a decimal value to which you want to write (e.g. 0x0A=10) and the data as a decimal value which you want to send (e.g. 0x1111=4369). When running this VI the parity bit (as decimal string) and the CRC value (as hexadecimal string) will be calculated and displayed. Fig. 8 22: Front-panel view of calculate_crc_write.vi Fig. 8 23: Block diagram view of calculate_crc_write.vi Micronas Feb. 2, 2010; APN000056_001EN 31

32 HAL 3625 APPLICATION NOTE 9.6. Flowchart Examples BEGIN see section 4 setup COM port Tx: sma Rx: 0:0000A Set board mode to HAL 3625 Biphase-M 3-wire Tx: vho1 Rx: 0:00001 switch V DD_HAL ON END Fig. 9 24: Flowchart HAL 3625 Initializing Application Board 32 Feb. 2, 2010; APN000056_001EN Micronas

33 APPLICATION NOTE HAL 3625 BEGIN Tx: xxsb000001d Rx: 0: set base address 0x0001 calculated CRC = D (for base address 0x0000 calculated CRC = E) Boardstatus equal to 0? no ERROR repeat command! yes END Fig. 9 25: Flowchart HAL 3625 setting base address to 0x0001 (or 0x0000) Micronas Feb. 2, 2010; APN000056_001EN 33

34 HAL 3625 APPLICATION NOTE BEGIN set base address to 0x0000 Tx: xxr08 Rx: 0:3D0D5 read register 0x08 (= DAC Gain & DAC Offset) Note: Rx-value may differ Boardstatus equal to 0? no ERROR repeat reading yes evaluate Rx-string calculate CRC of 0x3D0D and compare with last character in Rx-string (0x5) equal? yes no CRC ERROR repeat reading DAC Gain: 0x3D = 61 DAC Offset: 0x0D = 13 END Fig. 9 26: Flowchart HAL 3625 reading from address 0x08 34 Feb. 2, 2010; APN000056_001EN Micronas

35 APPLICATION NOTE HAL 3625 BEGIN set base address to 0x0000 calculate CRC value of address 0x08 and data 0x3820 (CRC=0xE) DAC-Gain = 50% -> 0x38 DAC-Offset = 25% -> 0x20 Tx: xxw083820e Rx: 0: write data 0x3820 and CRC=0xE to address 0x08 Boardstatus equal to 0? no ERROR repeat writing yes END Fig. 9 27: Flowchart HAL 3625 writing to address 0x08 Micronas Feb. 2, 2010; APN000056_001EN 35

36 HAL 3625 APPLICATION NOTE BEGIN set base address to 0x0003 Boardstatus equal to 0? no ERROR set base address yes write 0x001E and CRC to address 0x0B Boardstatus equal to 0? no ERROR repeat writing yes write 0x0015 and CRC to address 0x0B Boardstatus equal to 0? no ERROR repeat writing yes write 0x0001 and CRC to address 0x0B END Fig. 9 28: Flowchart HAL 3625 store data in NVRAM (only base address 0x03) 36 Feb. 2, 2010; APN000056_001EN Micronas

37 HAL 3625 APPLICATION NOTE 10. Application Note History 1. HAL 3625, Feb. 2, 2010; APN000056_001EN. First release of the application note. Micronas GmbH Hans-Bunte-Strasse 19 D Freiburg P.O. Box 840 D Freiburg, Germany Tel Fax Internet: 37 Feb. 2, 2010; APN000056_001EN Micronas

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