http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008 Rickey's World contact@nospam.com (Ajay Bhargav) contact@nospam.com (Ajay Bhargav) Thu, 08 Jan 2009 23:22:17 -0800 Thu, 08 Jan 2009 23:22:17 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php http://www.8051projects.net/forum-t11124.html Sat, 26 Jul 2008 12:12:08 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
Hi Lucky number,

what is the problem/s you are facing with them ?



Arun]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Jul 2008 18:41:33 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
Thank you very much for your reply. Currently I am trying to set the AT89C51ED2 Microcontroller into Bootloader Function in order to program it. But I keep prompting with "Timeout Error" everytime I am trying to interface MAX-232 with AT89C51ED2 using ATMEL Flip Program. Can I know why I keep getting the error message? What is the possible cause of this error? ]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Jul 2008 19:10:06 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html Hi Lucky,

this problem arises when the serial Programming Software ( here it is FLIP) sends a alert command to the On chip Boot loader and expects response from the boot loader.

the serial programming makes a number of attempts to evoke response from the boot loader and finally gives up saying " timeout error".


Possible causes of error:

1) micro doesn't "see" the incoming command - incorrect wiring of Max232

2) the software Transmits command but doesn't receive response from Micro - internal RS232 chip failure on the motherboard ( it happened to me - had to change the motherboard)

3) micro serial port pins damaged (externally or internally)

4) wrong wiring of DB9 serial cable



check for the above and hopefully your problem would be resolved !



Arun]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Jul 2008 19:37:19 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html Also tell us how you've wired the EA and PSEN pins.]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Jul 2008 20:12:30 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
Thank you for your helpful info. This is my Schematic layout for the MAX232 and AT89C51ED2. Another one is the schematic for MAX232 with diode. Can I know the difference between these two configuration? Which is better?




Basically these are the steps taken to set into Bootloader Function:

i. Set the PSEN to ground.
ii. Press the RESET button which will supply 5V to AT89C51ED2 RESET Pin.
iii. Set the PSEN to 5V.

Are these steps correct in order to triggered the chip into Bootloader Function?
]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Jul 2008 20:33:32 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
I set the EA pin to 5V as well.]]> contact@nospam.com (Ajay Bhargav) Sun, 27 Jul 2008 07:30:41 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
i feel the micro has not entered the ISP mode, that may the reason for error.

follow these steps:

1) switch off the supply to the board

2) wire the EA 31 pin to +5V

3) wire a push button switch between PSEN and GND also use a 1.5K resistor (pull down resistor) like this : PSEN-------Switch leg 1-------switch leg2----1.5k-----GND

4) Switch ON the supply

5) Press and hold down Reset button

6) Press and hold push button which connects PSEN to GND thru 1.5K resistor

7) release the Reset button ( while still holding down the PSEN Button)

8) release the PSEN button

9) the Chip will be in boot loader mode and then use Flip to communicate with the chip, also remember to use 11.0592 Mhz Xtal (this value works for all baudrates)



All the Best !


Arun

]]> contact@nospam.com (Ajay Bhargav) Sun, 27 Jul 2008 10:40:47 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
Thank for your help. l'll try the step.]]> contact@nospam.com (Ajay Bhargav) Sun, 27 Jul 2008 19:13:47 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html The 1st schematic you posted is horribly incorrect.Hope you haven't used that.
Make corrections according to this schematic which is taken from the serial tutorial at this very site...



]]> contact@nospam.com (Ajay Bhargav) Sun, 27 Jul 2008 20:13:03 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
Hey lucky,

Arun sir, has provided correct steps to bring the Micro into boot loader mode, i followed his steps and the micro was programmed using flip!

remember to press the thanks button for Arun sir]]> contact@nospam.com (Ajay Bhargav) Sun, 27 Jul 2008 23:39:05 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html Hello Lucky,

Congrats on successfully programming the micro !

you should select a micro which has Hardware SPI port, and large amount of RAM in KB.

SD card has several sectors divided as 512 byte pages or chunks. we have to access all the 512 bytes at a time, this task is hard with normal 8051 which has 128/256 bytes of RAM.

Not only that, the 16 bit or 32 bit file system on SD card requires lot of RAM and programming. there are several Libraries for AVRs and PICs to interface with SD card




Arun]]> contact@nospam.com (Ajay Bhargav) Sun, 03 Aug 2008 10:38:39 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
Thank you very much for your help. I have successfully bring my Micro controller into Boot Loader mode.
Can I know how to interface a SD Card with the Micro? I have problem in understanding the SPI Mode.]]> contact@nospam.com (Ajay Bhargav) Sun, 03 Aug 2008 07:32:32 -0700 http://www.8051projects.net/forum-t11124.html http://www.8051projects.net/forum-t11124.html
Thank you for you reply. I have to use 8051 micro controller for this project. I know that's the limitations to me. Do you have any idea to write a C Code to interface the 8051 with the SD Card. Can you explain more on SPI mode to me?
]]> contact@nospam.com (Ajay Bhargav) Mon, 04 Aug 2008 05:51:18 -0700 http://www.8051projects.net/forum-t11124.html