Easy-Downloader V1.1 with SDCC

文章摘要： Figure 4: Component placment layout.Bill Of Materials The component list is shown in Figure 5. U1 the master chip must be programmed with writer1.hex before the programmer board can run properly. Q2 and Q3 are TO92 plastic package! With a CAN package, pin positions may differ on the layout. You can

Easy-Downloader V1.1 with SDCC,标签：电路图讲解,电路图练习,http://www.88dzw.com

Figure 4: Component placment layout.

Bill Of Materials

The component list is shown in Figure 5. U1 the master chip must be programmed with writer1.hex before the programmer board can run properly. Q2 and Q3 are TO92 plastic package! With a CAN package, pin positions may differ on the layout. You can use any small signal transistors to replace them. VB1 is male type!  All resistors can be 1/4W or 1/8W 5%.
 

Bill Of Materials        January 4,2004      10:44:35 Page1 Item Quantity Reference Part ______________________________________________ 1 2 C1,C2 30pF disceramic 2 2 C8,C3 10uF 16V electrolytic 3 1 C4 10uF 10V electrolytic 4 5 C5,C6,C7,C12,C13 10uF electrolytic 5 1 C9 470uF 25V electrolytic 6 2 C10,C11 0.1uF multilayer 7 2 C14,C15 0.1uF multilayer 8 1 D1 POWER small red LED for power indicator 9 1 D2 1N4007 silicon rectifier diode 10 1 J1 DC jack  11 1 Q1 11.0592MHz low profile crystal 12 1 Q2 2N2907 PNP small signal transistor 13 1 Q3 2N2222A NPN small signal transistor 14 5 R1,R3,R6,R10,R11 10K 15 1 R2 250 16 1 R4 1150 17 1 R5 2150 18 1 R7 4.7k 19 1 R8 1k 20 1 R9 2k 21 1 U1 AT89C2051 20-pin DIP Microcontroller with 2kB Flash 22 1 U2 74LS373 D-type FF 23 1 U3 20-pin ZIF (Zero-Insertion-Force) socket 24 1 U4 LM317/TO adjustable regulator 25 1 U5 MAX232A 16-pin DIP RS232 level converter 26 1 U6 LM7805/TO fix +5V voltage regulator 27 1 VB1 SUB-D 9 (male) for NULL CABLE    DB9 connector

Figure 5: Component list.

Software

sdcc has the header file that declares bit variables and we can use them in program directly. We can define the specified bits as below,
 

#define LM317 P3_5 #define LE P3_7 #define prog P3_2 #define rdy P3_3 #define xtal P3_4 #define p10 P1_0 #define p11 P1_1 #define p12 P1_2 #define p13 P1_3 #define p14 P1_4

In c program, we can use assignment statement to set or clear them directly. For instance, function that makes low to high transition at P3.2,
 

pulseProg() {  prog = 0;  prog = 0;  prog = 0;  prog = 1; }

The ASCII strings were defined with modifier, 'code', so the compiled code will place them in code memory space.

char code title[] = '\n\r Easy-Downloader V1.3 for ATMEL 89C2051/4051 (sdcc version)';
char code prompt[] = '\n\r >';
char code ok[] = '\n\r ok';

I have built function that print string to terminal, to make it compatible with the old version with Micro-C. Look at the source cod here,
 

putstr(char *s) {  char i=0;  char c;  while((c=*(s+(i++)))!= 0) putchar(c); // while byte is not terminator, keep sending }

The pointer s points to the start address of string. It will send character to serial port with function putchar while the character is not the terminator byte!

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Tag:单片机电路图，电路图讲解,电路图练习，电子电路图 - 单片机电路图