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If you are planning to use any of the AVR mega devices, then you need the STK300 board. It is very similar to the STK200 but only supports ATmega603, ATmega603L, ATmega103m, and ATmega103L.
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8.4 ICE200 AVR Emulator
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Atmel has recently introduced a low-cost In-Circuit Emulator, the ICE200, priced at $200. An In-Circuit Emulator has a pod that is connected to the target controller socket during
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THE DEVICE PROGRAMMER 193
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FIGURE 8.8 Photograph of the STK200 evaluation board.
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development. The pod connects to the emulator, which has a special Super AVR chip. On the other end, the emulator connects to the PC and the user can single-step the program in the target, monitor I/O activity, register contents, set break points, etc. The ICE200 AVR Emulator is controlled through the AVR Studio.
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8.5 The Device Programmer
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Evaluation boards are great for developing your application as well as programming the AVR controller chip with the code. However, all the evaluation boards program the AVR chips in the so-called low-voltage serial programming mode. The low-voltage serial programming mode cannot program certain fuse bits like the SPIEN and RCEN fuse bits. To program or change these bits, the AVR chip must be programmed in the parallel programming mode (for AVR chips with more than 8 pins) or the high-voltage serial programming mode (for 8-pin AVR chips). A dedicated device programmer with parallel programming (or high-voltage serial programming) features is very useful to satisfy these needs. The Atmel Web page has a list of many programmer vendors: (http://www.atmel.com/atmel/products/prod205.htm). One of the programmer vendors, MITE (http://www.mite.cz/), offers one such programmer that has had good user response.
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194 AVR SYSTEM DEVELOPMENT TOOLS
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8.6 AVR System Design with Components off the Shelf (COTS)
8.6.1 The SimmStick magic
SimmStick is a 30-pin simm-socket-based Single Board Computer designed by Antti Lukats from Estonia, originally for the PIC16Cxx chips. The simm socket used is the common 30-pin one used for many years on PC motherboards. SimStick is now available for Atmel AVR processors for both 20- and 40-pin DIP packaging. The SimmStick system consists of a motherboard (the backplane). The motherboard (such as DT003) has space for up to four daughtercards such as the DT103/104 controller card, additional daughtercards such as DT201 (one-inch prototype board), DT202 (twoinch prototype board), DT203 (LEDs, switches, ULN2803 drivers board) or the DT205 (relay board for four relays).
SimmStick Bus Pinout PIN # NAME DESCRIPTION
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
A1 A2 A3 PWR CI CO VDD RES GND SCL SDA SI SO IO D0 D1 D2 D3 D4 D5 D6 D7
Special IO Special IO Special IO or Negative Supply Unregulated DC in or Clock Input or OSC1 Clock Output or OSC2 5 V In or Out Reset In or Out Digital Ground I2C Clock or I/O I2C Data or I/O Serial In or I/O Serial Out or I/O General-purpose I/O General I/O General I/O General I/O General I/O General I/O General I/O General I/O General I/O 12V or VPP
CODE DEVELOPMENT WITH A HIGH-LEVEL LANGUAGE 195
23 24 25 26 27 28 29 30
D8 D9 D10 D11 D12 D13 D14 D15
General I/O General I/O General I/O General I/O General I/O General I/O General I/O General I/O
The advantage of adopting the SimmStick approach is the great speed of system development. It is claimed (and rightly so) that a simple working AT90S1200 application can be wired on the DT104 board in under five minutes. Figure 8.9 illustrates the DT104 circuit schematic, Figure 8.10 illustrates the DT104 PCB component overlay, and Figure 8.11 illustrates a populated DT104 photograph. More details about the SimmStick boards are available at www.dontronics.com.
8.7 Code Development with a HighLevel Language
For larger AVR processors, using a high-level language for developing your application would be very useful and convenient. Currently, high-level language compilers for C as well as Basic are available. For the C language, IAR s C compiler (www.iar.com) is reported to be the best and also the most expensive. Many inexpensive or free compilers are available, and some of these are listed below.
C-AVR: A C COMPILER FOR AVR
C-AVR is a low-cost C compiler that I have used to develop code for the dual-channel voltmeter project in this book. The features of this compiler are:
1. Supports all members of the AVR family which have stack. e.g. 2313, 2323, 4414,
2. 3. 4. 5.
8515, 8535, etc., and ATmega603/103. (Also available is a low-cost version, C-AVRN, which has the same features but does not support mega devices.) Uses (and includes) Atmel s AVRASM assembler, so output of the compiler can be debugged with Atmel s AVR Studio debugger. Supported data types: char, unsigned char, int, unsigned int, long int, unsigned long int, float. Runs off Windows 95/98. Includes Visual Code Generator (VCG). Using the VCG, on-chip peripheral functions (such as a serial port) can be visually programmed. E.g., you may just enter the crystal frequency and the desired baud rate; the VCG generates C language statements such as UBRR 0x18 and UCR 0x20, etc.
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