Chapter 3: HCS12 Hardware and Software Development Tools. The HCS12 Microcontroller. Han-Way Huang. Minnesota State University, Mankato
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1 Chapter 3: HCS12 Hardware and Software Development Tools The HCS12 Microcontroller Han-Way Huang Minnesota State University, Mankato September 2009 H. Huang Transparency No.3-1
2 Development Tools Software Development Tools Text editor: for entering source code using a PC Terminal program: allows a PC to communicate with the demo board Cross assembler: running on a PC to assemble programs written in an assembly language Cross compiler: running on a PC to compile programs written in a high-level language Simulator: running on a PC and allows to user to verify the logic of user programs Source-level debugger: running on a PC and allows the user to verify programs by using breakpoints, watch list, run-to-cursor, and so options to verify the correctness of programs Integrated development environment (IDE): a software running on the PC that combines a text editor, terminal program, cross assembler, cross compiler, and source-debugger and allows the user to switch from one tool to another without quitting any of them. H. Huang Transparency No.3-2
3 Software Tools Used in this Book MiniIDE: consisting of a text editor, a cross assembler, a terminal program, and a simple project manager (a freeware) asmide: consisting of a text editor, a cross assembler, a terminal program, and a simple project manager (a freeware) ICC12: consisting of a text editor, a cross C compiler, a terminal program, and a simple project manager (demo version of ImageCraft product 8 kb size limit) CodeWarrior: consisting of a text editor, a cross assembler, a cross C compiler, driver programs for serial monitor and several BDM adaptors, and a source-level debugger (demo version of Freescale product 32 kb size limit) EGNU and GNU C compiler: consisting of a text editor, a C compiler, a terminal program, and a simple project manager (a freeware) H. Huang Transparency No.3-3
4 Hardware Development Tools BDM-based Debug Adapter The HCS12 provides a background debug module that allows the user to perform software debug activities (set break-point, trace program, execute program to a breakpoint or a certain location, etc) via the serial interface. In-Circuit Emulator (ICE) ICE is an expensive hardware that allows the developer to perform program debug activities before their hardware has been constructed. Demo Board A demo board allows the user to test their programs using the target microcontroller before their final hardware has been constructed. Digital or ordinal Oscilloscope A oscilloscope allows the user to observe the waveform generated from the microcontroller And hence enables the user to verify their program logic. Only demo boards will be discussed. H. Huang Transparency No.3-4
5 Types of Demo Boards Demo Boards with the D-Bug12 Monitor Wytec Dragon12-Plus Wytec Mini-Dragon Demo Boards with the Serial Monitor Wytec Dragon12-Plus Wytec Mini-Dragon Demo Boards with the BDM Adaptor Freescale Project boards with a HCS12DT256 module and a P&E BDM interface Axiom Manufacturing CMD-12DP512 with the Turbo BDM Light (TBDML) interface H. Huang Transparency No.3-5
6 The Dragon12-Plus Demo Board - 24 MHz bus speed (generated from a 4-MHz crystal). - D-Bug12 or serial monitor - 16 x 2 LCD kit (4-bit interface) - Eight LEDs - Four seven-segment displays - Keypad connector - Four buttons for input - DIP switches for input - Buzzer for playing siren and songs (wired to the PT5 pin) - Potentiometer for testing A/D function (wired to PAD7 pin) - Infrared transceiver - CAN transceiver (Philips PCA82C250) - A small breadboard - BDM IN and BDM OUT connectors - Two RS232 connector - LTC bit D/A converter chip with SPI interface - 24LC16 serial EEPROM with I 2 C interface - A DIP switch - A Temperature sensor H. Huang Transparency No.3-6
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8 The Mini-Dragon Demo Board H. Huang Transparency No.3-8
9 The D-Bug12 Monitor - Supports most HCS12 devices with 128KB and 256 KB flash memory - Used in many demo boards - Requires a host terminal program that supports the Xon/Xoff software handshake for proper operation - The HyperTerminal bundled with Windows and the terminal program bundled with asmide, miniide, ICC12, and EGNU IDE can work with D-Bug12 monitor - Supports four operating modes: EVB mode, Jump to EEPROM mode, POD mode, and Serial Bootloader mode - After reset, the D-Bug12 reads the logic levels on the PAD1 and PAD0 pins to decide which of the four D-Bug12 modes to enter. Table 3.1 D-Bug12 operating modes PAD1 PAD0 Operating mode D-Bug12; EVB Jump to internal EEPROM D-Bug12; POD SerialBootloader H. Huang Transparency No.3-9
10 EVB Mode - The D-Bug12 monitor operates from the flash memory - The users are restricted to use SRAM (from $1000 to $3BFF) or EEPROM to run application programs. - The user runs a terminal program on the PC to communicate with the D-Bug12 monitor on the demo board. - EVB operation model is shown in Figure 3.4. HCS12 demo board target system low-level interface routines D-Bug12 PC running a terminal program User Figure 3.4 EVB model conceptual model - When the demo board is powered up and the baud rate is set properly, the message as shown in Figure 3.5 will appear on the terminal screen. D-Bug b24 Copyright Motorola Semiconductor For Commands type "Help" Figure 3.5 D-Bug12 EVB mode sign on message H. Huang Transparency No.3-10
11 - The D-Bug12 monitor displays the character to indicate it is ready for operation. - When a command issued to D-Bug12 is successfully executed, the monitor displays the execution result and a new character on a new line. - If a command is not successfully executed, one can press the reset button to get out. - An alternative to get out of the unsuccessful command is to press the abort key. - The abort key is connected to the XIRQ signal. - The Dragon12-Plus demo board uses the MC9S12DG256 as their MCU. - The memory maps for these two demo boards are shown in Table 3.2. Table 3.2 D-Bug12 memory map for HCS12Dx256 Address range $0000-$03FF $0400-$0FFF $1000-$3BFF $3C00-$3FFF $4000-$EE7F $EE80-$EEBF $EEC0-$EEFF $EF00-$EF8B $EF8C-$EFFF $F000-$FFFF Description I/O registers on-chip EEPROM on-chip SRAM (available to user) on-chip SRAM (D-Bug12) D-Bug12 code User accessable function table Customization data D-Bug12 startup code Secondary reset/interrupt table Bootloader H. Huang Transparency No.3-11
12 Using the MiniIDE Step 1. Invoke MiniIDE by double clicking the icon of MiniIDE. Step 2. Communicating with the Demo Board. - Press the Terminal menu (shown in Figure C.2) and select Show Terminal Window. - Press the reset button on the demo board and the screen will change to Figure C.3. H. Huang Transparency No.3-12
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15 Step 3. Setting Options. - Set Options can be found under the Build menu and Terminal menu. H. Huang Transparency No.3-15
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17 Options in General Category H. Huang Transparency No.3-17
18 Options in the Terminal Category H. Huang Transparency No.3-18
19 Options in the Tools Category H. Huang Transparency No.3-19
20 Options in the Assembler Category H. Huang Transparency No.3-20
21 Step 4. Open a new file for entering an assembler program - Press the File menu and select New and the screen is changed to Figure C Enter the program as shown in Figure C Save the file after the whole program is entered. Press the File menu and select Save as shown in Figure C.12 H. Huang Transparency No.3-21
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24 Step 5. Assemble the program. - Press the Build menu and select Build siren.asm as shown in Figure C After a successful assembly, the status window will display the corresponding message as shown in Figure C.14. H. Huang Transparency No.3-24
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26 Step 6. Download the program onto the demo board. - Type the load command followed by the enter key in the terminal window. - Press the Terminal menu and select Download File (shown in Figure C.15). - A dialog box as shown in Figure C.16 appears. - Enter the name of the file to be downloaded and click on Open. - After a successful download, the screen is changed to Figure C.17. H. Huang Transparency No.3-26
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29 Step 7. Running and debugging the program. - Type g 2000 followed by enter key. - This program will generate a two-tone siren Using the D-Bug12 Commands BF <StartAddress <EndAddress [<Data] - Fill a block of memory locations with the value of <Data. - To fill the memory locations from $1000 to $1FFF with 0, enter the following command: bf FFF 0 MD <StartAddress [< EndAddress ] - Display memory contents from < StartAddress to < EndAddress bytes are displayed on each line. - The <StartAddress is rounded down to the next lower multiple of The <EndAddress is rounded up to the next higher multiple of Only one line is displayed if the EndAddress is not specified. H. Huang Transparency No.3-29
30 md AA C - D7 98 9A 61 - DF BE BC E9-03 AE D0 3D...a...= md AA C - D7 98 9A 61 - DF BE BC E9-03 AE D0 3D...a...= DA DF 39-3F 34 BD A9-2A CA FA DB - AC DA u..9?4..* D 5B 48 BA - B2 F7 B6 1B E5 E4 - A5 E9 01 9F M[H... MDW <StartAddress [<EndAddress] mdw AA85 060C - D798 9A61 - DFBE BCE9-03AE D03D...a...= mdw AA85 060C - D798 9A61 - DFBE BCE9-03AE D03D...a...= DA DF39-3F34 BDA9-2ACA FADB - ACDA 1897 u..9?4..* D5B 48BA - B2F7 B61B E5E4 - A5E9 019F M[H... H. Huang Transparency No.3-30
31 MM <Address [<Data] - Used to examine and modify the contents of memory locations one byte at a time. - If the 8-bit data parameter is present on the command line, the byte at memory location <Address is replaced with <Data and the command is terminated. - If no data is provided, then D-Bug12 enters the interactive memory modify mode. - In the interactive mode, each byte is displayed on a separate line following the address of data. - Single-character sub-commands are used for the modification and verification of memory contents in interactive mode. - The available sub-commands are as follows: [<Data] <CR [<Data] </ or <= [<Data] <^ or <- [<Data] <. Optionally update current location and display the next location. Optionally update current location and redisplay the same location. Optionally update current location and display the previous location. Optionally update current location and exit Memory Modify. H. Huang Transparency No.3-31
32 Example of MM Command mm FF ^ 1001 FF / MMW <Address [<Data] - Allows the contents of memory to be examined and/or modified as 16-bit hex data. - If the 16-bit data is present on the command line, the word at memory location <Address is replaced with <Data and the command is terminated. - If no data is provided, then D-Bug12 enters the interactive memory modify mode. - MMW supports the same set of sub-commands as does the MM command. H. Huang Transparency No.3-32
33 mmw F AA ^ aabb Move <StartAddress <EndAddress <DestAddress - The number of bytes moved is one more than <EndAddress - <StartAddress move ff 1100 RD register display rd PP PC SP X Y D = A:B CCR = SXHI NZVC C E: xx:1521 9C42 CPD $0042 H. Huang Transparency No.3-33
34 RM register modification This command is used to examine or modify the contents of CPU registers. rm PC= SP=0A00 IX= IY=0000 A=00 B=00 ff CCR=90 d1 PC=1500. <RegisterName <RegisterValue - Allow one to change the value of any CPU register. - Each bit of the CCR register can be changed by specifying its name. H. Huang Transparency No.3-34
35 pc 2000 PC SP X Y D = A:B CCR = SXHI NZVC A :FF x 800 PC SP X Y D = A:B CCR = SXHI NZVC A :FF c 0 PC SP X Y D = A:B CCR = SXHI NZVC A :FF z 1 PC SP X Y D = A:B CCR = SXHI NZVC A :FF d 2010 PC SP X Y D = A:B CCR = SXHI NZVC A : H. Huang Transparency No.3-35
36 Table 3.4 Condition code register bits CCR bit name Description Legal Values S H N Z V C IM XM STOP enable Half carry Negative flag Zero flag Two's complement over flg Carry flag IRQ interrupt mask XIRQ interrupt mask 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 ASM <Address - Invokes the one-line assembler/disassembler. - Allows memory contents to be viewed and altered using assembly language mnemonics. - When displaying instructions, each instruction is displayed in its mnemonic form. - The assembly/disassembly process can be terminated by a period. - The one-line assembler displays the current instruction and allows the user to enter new instruction. - User can skip the current instruction by pressing the Enter key. H. Huang Transparency No.3-36
37 The following example displays instruction starting from $2000: asm FC0800 LDD $ CD0900 LDY #$ CE000A LDX #$000A IDIV 200B CB30 ADDB #$30 200D 6B44 STAB 4,Y 200F B7C5 XGDX 2011 CE000A LDX #$000A. The following example enters three instructions (in bold face) starting from $1500: asm FC0800 LDD $ F30802 ADDD $ C0900 STD $ E78C TST 12,SP. H. Huang Transparency No.3-37
38 BR [<Address ] Setting or examine breakpoints - A breakpoint halts the program execution when the CPU reaches the breakpoint address. - When a breakpoint is encountered, the D-Bug12 monitor displays the contents of CPU registers and the instruction at the breakpoint (not executed yet). - Breakpoints are set by typing the breakpoint command followed by one or more breakpoint addresses. - Entering the breakpoint command without any breakpoint addresses will display all the currently set breakpoints. - A maximum of two user breakpoints may be set at one time. br Breakpoints: Breakpoint Table Full ; set three breakpoints H. Huang Transparency No.3-38
39 NOBR [<Address <Address] - Delete one or more previously defined breakpoints - All breakpoints will be deleted if no addresses are specified. br Breakpoints: Breakpoint Table Full nobr 2000 Breakpoints: 2010 ; set four breakpoints ; delete one breakpoints G [<Address] - Begin execution of user code at the specified address. - If no address is specified, CPU starts execution of the instruction at the current PC address. g 1500 User Bkpt Encountered PP PC SP X Y D = A:B CCR = SXHI NZVC C 3C00 7B :E xx:150c 911E CMPA $001E H. Huang Transparency No.3-39
40 GT <Address - Execute instruction until the given address and stop. - User usually needs to specify where the program execution should start before issuing this command. pc 1500 PP PC SP X Y D = A:B CCR = SXHI NZVC C : xx:1500 CF1500 LDS #$1500 gt 1540 Temporary Breakpoint Encountered PP PC SP X Y D = A:B CCR = SXHI NZVC E: xx:1510 3B PSHD H. Huang Transparency No.3-40
41 T [<count] - Used to execute one or multiple instructions starting from the current PC address. - As each program instruction is executed, the CPU register contents and the next instruction to be executed are displayed. - Only one instruction will be executed when no count is specified. pc 1500 PP PC SP X Y D = A:B CCR = SXHI NZVC E: xx:1500 CF1500 LDS #$1500 t PP PC SP X Y D = A:B CCR = SXHI NZVC E: xx:1503 CE1000 LDX #$1000 t 2 PP PC SP X Y D = A:B CCR = SXHI NZVC E: xx: PSHX PP PC SP X Y D = A:B CCR = SXHI NZVC FE E: xx: E LDAA #$1E H. Huang Transparency No.3-41
42 CALL [<Address] - Used to execute a subroutine and returns to the D-Bug12 monitor program. - All CPU registers contain the values at the time the final RTS instruction was executed, with the exception of the program counter. - The program counter contains the starting address of the subroutine when returning from the subroutine. call 1600 Subroutine Call Returned pp PC SP X Y D = A:B CCR = SXHI NZVC A : xx:1600 FC1000 LDD $1000 H. Huang Transparency No.3-42
43 The Pod Mode - This mode is intended to run the demo board as a BDM host to control a target board. - The arrangement is shown in Figure your demo board User Terminal (or PC) D-Bug12 Low-level interface routine Background debug command HCS12 microcontroller Target system Figure 3.19 D-Bug12's POD mode conceptual model H. Huang Transparency No.3-43
44 The Jump-to-EEPROM Mode - Execute a small program from the on-chip EEPROM whenever the EVB is powered up or reset. - This mode provides a way to execute a program in a standalone manner without having to erase and program the on-chip flash memory using the bootloader. The Bootloader Mode - The Bootloader resides from $F000 to $FFFF. - Bootloader can be used to erase and reprogram the remainder of on-chip flash memory or erase the on-chip EEPROM. - Bootloader utilizes the SCI port for communication. - The only required host program is a terminal program that can communicate at 9600 to 115,200 baud and supports XON/XOFF handshaking. - The bootloader mode prompt is as follows: HCS912DP256 Bootloader a) Erase Flash b) Program Flash c) Set Baud Rate d) Erase EEPROM? Figure 3.20 Serial bootloader prompt H. Huang Transparency No.3-44
45 Tips for Assembly Program Debugging Syntax Errors - Misspelling of instruction mnemonics. - Starting instruction mnemonic at column 1. The mnemonic is treated as a label whereas the operands are treated as mnemonic. - Missing operands - Will be highlighted by the assembler and are easy to fix. Logic Errors 1. Using extended (or direct) mode instead of immediate mode - A program with this type of addressing mode error is on the next page. H. Huang Transparency No.3-45
46 N equ 20 ; array count org $1000 array dc.b 2,4,6,8,10,12,14,16,18,20 dc.b 22,24,26,28,30,32,34,36,38,40 sum ds.w 1 org $1500 ldx array ; place the starting address of array in X movw 0,sum ; initialize sum to 0 ldy N ; initialize loop count to N loop ldab 1,x+ ; place one number in B and move array pointer sex B,D ; sign-extend the 8-bit number to 16-bit addd sum ; add to sum std sum ; update the sum dbne y,loop ; add all numbers to sum yet? swi ; return to monitor end - Assemble and download this program onto the demo board. load... done H. Huang Transparency No.3-46
47 - Use the asm command to make sure that the program is downloaded correctly. asm 1500 xx:1500 FE1000 LDX $1000 xx: MOVW $0000,$1014 xx:1509 DD14 LDY $0014 xx:150b E630 LDAB 1,X+ xx:150d B714 SEX B,D xx:150f F31014 ADDD $1014 xx:1512 7C1014 STD $1014 xx: F3 DBNE Y,$150B xx:1518 3F SWI. - Make sure that program data is downloaded correctly. Use the md command: md A 0C 0E A 1C 1E B9 A9-2A CA FA DB - AC DA "$&(...*... H. Huang Transparency No.3-47
48 Run the Program g 1500 User Bkpt Encountered PP PC SP X Y D = A:B CCR = SXHI NZVC C FF: xx: F4 EORA #$F4 Examine the execution result incorrect!! md FF 07 B9 A9-2A CA FA DB - AC DA The program is short. - Errors can be found by tracing. - Set PC to the start of the program (at $1500) pc 1500 PP PC SP X Y D = A:B CCR = SXHI NZVC C FF: xx:1500 FE1000 LDX $1000 H. Huang Transparency No.3-48
49 Trace One Instruction at a time t 1 PP PC SP X Y D = A:B CCR = SXHI NZVC C FF: xx: MOVW $0000,$ The executed instruction is ldx $1000 which should place the start address of the array in X. - The instruction trace result shows that X receives $0104 not $ This is due to addressing mode error. - Change the instruction to ldx #$1000 and rerun the program. - Reload the program and trace the program. - Trace two instruction this time. H. Huang Transparency No.3-49
50 t 2 PP PC SP X Y D = A:B CCR = SXHI NZVC C FF:F xx: MOVW $0000,$1014 PP PC SP X Y D = A:B CCR = SXHI NZVC C FF:F xx:1509 DD14 LDY $0014 md 1010 ; examine sum at $1014~$ FF 00 B9 A9-2A CA FA DB - AC DA We expect the variable sum (at $1014 and $1015) to receive $0000. But it didn t. - The error is again caused by incorrect use of the addressing mode. - The movm 0,sum instruction copies the contents of memory location 0 to sum. - Change the second instruction to movw #0,sum. Rerun the program and examine the memory contents. It is still incorrect!! H. Huang Transparency No.3-50
51 load * g 1500 User Bkpt Encountered PP PC SP X Y D = A:B CCR = SXHI NZVC C00 100F :F xx: F4 EORA #$F4 md F0 B9 A9-2A CA FA DB - AC DA Trace the program up to the third instruction: H. Huang Transparency No.3-51
52 pc 1500 PP PC SP X Y D = A:B CCR = SXHI NZVC C00 100F :F xx:1500 CE1000 LDX #$1000 ; 1 st instruction t 3 PP PC SP X Y D = A:B CCR = SXHI NZVC C :F xx: MOVW #$0000,$1014 ; 2 nd instruction PP PC SP X Y D = A:B CCR = SXHI NZVC C :F xx:1509 DD14 LDY $0014 ; 3 rd instruction PP PC SP X Y D = A:B CCR = SXHI NZVC B 3C F 00:F xx:150b E630 LDAB 1,X+ - The program intends to load 20 into Y with the third instruction and expect Y to be set to 20. But Y did not get 20. It receives F instead. - This is due to the incorrect use of the addressing mode. - Change the instruction to ldy #20 and rerun the program. H. Huang Transparency No.3-52
53 g 1500 User Bkpt Encountered PP PC SP X Y D = A:B CCR = SXHI NZVC A 3C :A xx:151a F421BD ANDB $21BD md A4 B9 A9-2A CA FA DB - AC DA After this correction, sum receives the correct value $1A4 (420). H. Huang Transparency No.3-53
54 Mismatch of Operand Size Example Program Finding the sum of elements of an array N equ 20 ; array count org $1000 array dc.b 2,4,6,8,10,12,14,16,18,20 dc.b 22,24,26,28,30,32,34,36,38,40 sum ds.w 1 org $1500 ldx #array ; place the starting address of array in X movw #0,sum ; initialize sum to 0 ldy #N ; initialize loop count to N loop ldd 1,x+ ; place one number in D and move array pointer addd sum ; add to sum std sum ; update the sum dbne y,loop ; add all numbers to sum yet? swi ; return to monitor end H. Huang Transparency No.3-54
55 The value of sum is incorrect after running the program: md A6 1F B9 A9-2A CA FA DB - AC DA This program can be debugged by tracing: pc 1500 PP PC SP X Y D = A:B CCR = SXHI NZVC C A6:1F xx:1500 CE1000 LDX #$1000 t PP PC SP X Y D = A:B CCR = SXHI NZVC C A6:1F xx: MOVW #$0000,$1014 t PP PC SP X Y D = A:B CCR = SXHI NZVC C A6:1F xx:1509 CD0014 LDY #$0014 t PP PC SP X Y D = A:B CCR = SXHI NZVC C 3C A6:1F xx:150c EC30 LDD 1,X+ H. Huang Transparency No.3-55
56 t PP PC SP X Y D = A:B CCR = SXHI NZVC E 3C : xx:150e F31014 ADDD $1014 The 4th instruction should place the value 2 in D rather than $0204. This is due to the incorrect use of the instruction of ldd 1,x+. This instruction should be replaced by the following two instructions: ldab 1,x+ clra Other logic errors 1. Inappropriate Use of Index Addressing Mode - Indexed addressing mode is often used to step through array elements. - After accessing each element, the index register must be incremented or decremented. - Program execution can t be correct if index register is incremented or decremented incorrectly. - This error can be found after performing computation in the first one or two elements by program tracing. H. Huang Transparency No.3-56
57 2. Stack frame errors This error will be discussed in Chapter Incorrect algorithm - This type of error can be detected by tracing the program. - The user needs to read the program carefully in order to find out the errors. Using CodeWarrior Has a built-in simulator. Supports debugging using the serial monitor resident on the demo board. Has drivers with several BDM-based debug adapters: 1. P&E Multilink/CyclonePro BDM adaptor 2. TBDML adaptor 3. Abatron BDI adaptor 4. Softec s indart debugger H. Huang Transparency No.3-57
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