etpu Automotive Function Set (Set 2)
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1 Freescale Semiconductor Application Note Document Number: AN3768 Rev. 0, 05/2009 etpu Automotive Function Set (Set 2) by: Geoff Emerson East Kilbride U.K. 1 Introduction This application note complements AN3768SW describing the enhanced time processing unit (etpu) automotive function set (set 2). Set 2 is a set of example functions that show how the etpu can be used in a typical engine management application. AN3768SW contains the binary image of the etpu code, source code, and the interface files for the function application programming interfaces (APIs). Set2 contains CRANK, CAM, KNOCK_WINDOW, FUEL, SPARK, and TOOTHGEN functions. These are discussed in this application note. AN3768SW is available to download at Freescale.com. 2 Function Set Overview The etpu Automotive Function Set consists of the following etpu functions. Dedicated application notes and API software are available for each function. Table 1. etpu Functions Contents 1 Introduction Function Set Overview CAM and CRANK Functions KNOCK_WINDOW FUEL SPARK TOOTHGEN Function Set Usage Files Included etpu Code CPU Interface Files Conclusion... 4 Function CAM & CRANK KNOCK_WINDOW FUEL SPARK TOOTHGEN Description Engine position functions Knock window function Fuel function Spark function Tooth generator function Related Application Note AN3769 AN3772 AN3770 AN3771 AN3801 The etpu functions are configurable and adjustable using various parameters and options, giving the user the ability to customize these functions to their specific application. Freescale Semiconductor, All rights reserved.
2 Function Set Usage To support the etpu functions, versions of the standard etpu header files etpuc.h (vesion 1.01) and etpuc_common.h (version 1.1) from ByteCraft were used. The following sections briefly describe the purpose of each etpu function. Refer to the application notes in the table for more details. 2.1 CAM and CRANK Functions The CAM and CRANK (engine position) functions measure the speed and position of a rotating engine. The CAM and CRANK together generate an angle counter. The angle counter is synchronized with the CRANK wheel angle and provides a counter representation of the instantaneous position of the engine. 2.2 KNOCK_WINDOW The KNOCK_WINDOW function outputs a number of angle-based knock windows with specified properties within a complete engine cycle and without CPU intervention. This function works in conjunction with CRANK and CAM etpu functions to produce pulses referenced to angles on the crankshaft. These pulses can be used to gate the analog to digital converter sampling of the knock sensor in a knock detection application. 2.3 FUEL The fuel function generates one or more fuel injection pulses controlling the amount of fuel in the intake manifold. Fuel injection pulses start at a defined engine angle and end at a specified time after start. Multiple additional injection pulses are allowed. The etpu synchronization functions CAM and CRANK provide angular information to the fuel function. 2.4 SPARK The spark function controls the generation of spark pulses synchronized to specific angular positions of a rotating engine, thus controlling the ignition timing of the engine. The etpu engine position functions CAM and CRANK provide angular information to the spark function. 2.5 TOOTHGEN The toothgen function generates signals for input to the engine postion functions (CAM and CRANK) for development and test purposes. This function generates a pair of output signals. The first one is a continuous output signal that mimics the pattern of a signal from a CRANK sensor on an automobile. The second signal is a single pulse CAM pulse per engine cycle. 3 Function Set Usage The etpu general function set release consists of the following items. etpu Function Source Code and Binary Image The etpu function source code and the compiled binary image are included in the following package, available on the Freescale website. AN3768SW Automotive Set Function Set (Set 2) source code and compiled binary image It is not necessary for the user to compile the etpu function source code. Only advanced etpu users can modify the etpu functions and then recompile using a suitable compiler. The CPU application needs to load the compiled etpu code into etpu shared code memory (SCM). The etpu code binary image is included together with other initialization items in the etpu_set2.h file. The etpu module initialization can be handled by the fs_etpu_init(...) function, this is one of the standard etpu utilities (etpu_util.c/.h). The etpu utilities are available on the Freescale website. See General C Functions for the etpu and AN2864SW. etpu Function APIs The etpu function APIs enable the use of etpu functions in applications. The etpu function API source code is included in the following packages available on the Freescale website. AN3769SW CAM and CRANK (Engine Position) etpu Functions API AN3772SW KNOCK_WINDOW etpu function API 2
3 Files Included AN3770SW FUEL etpu function API AN3771SW SPARK etpu function API AN3801SW TOOTHGEN etpu function API The etpu function APIs include CPU functions that demonstrate how to initialize, control, and monitor the etpu function. The CPU application does not need to access etpu channel registers and or function parameters directly. Instead, the CPU application can use the etpu function APIs. 4 Files Included The following files are included in AN3768SW: etpu_set2\etpu_set2.h etpu_set2\makefile etpu_set2\etpuc_set2.cod Image of etpu code for host CPU, generated by ByteCraft etpu compiler A makefile used to build the code Debug information for set2 functions 4.1 etpu Code etpu_set2\etpu_set2.c etpu_set2\etpuc.h etpu_set2\etpuc_common.h etpu_set2\etpuc_util.h etpu_set2\etpuc_cam.h etpu_set2\etpuc_cam.c etpu_set2\etpuc_crank.h etpu_set2\etpuc_crank.c etpu_set2\etpuc_knock_window.h etpu_set2\etpuc_knock_window.c etpu_set2\etpuc_fuel.c etpu_set2\etpuc_spark.c etpu_set2\etpuc_toothgen.c Top level file for set2 functions Standard, include file for etpu code Defines application-friendly macros and functions for common tasks Macros from Bytecraft used by some of the functions Header file for the etpu CAM function C source for the etpu CAM function Header file for the etpu CRANK function C source for the etpu CRANK function Header file for the etpu KNOCK_WINDOW function C source for the etpu KNOCK_WINDOW function C source for the FUEL function C source for the etpu SPARK function C source for the etpu SPARK function 4.2 CPU Interface Files These files are automatically generated by the etpu compiler and provide an interface between the etpu code and the CPU code. All references to the automotive set functions must be made with information in these files. This allows only symbolic information to be referenced allowing the etpu code to be optimized without effecting the CPU code. etpu_set2\cpu\etpu_cam_auto.h etpu_set2\cpu\etpu_cam_auto.h etpu_set2\cpu\etpu_knock_window_auto.h etpu_set2\cpu\etpu_fuel_auto.h CAM function interface information CRANK function interface information KNOCK_WINDOW function interface information FUEL function interface information 3
4 Conclusion etpu_set2\cpu\etpu_spark_auto.h etpu_set2\cpu\etpu_toothgen_auto.h SPARK function interface information TOOTHGEN function interface information 5 Conclusion This application note provides a description of the etpu Automotive Function Set (Set 2) and complements AN3768SW. AN3768SW contains the binary image of the etpu code and source code. 4
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