SIM900 stm32 interfacing problem.

erayurtseven · ‎2014-03-27

Posted on March 27, 2014 at 23:29

I am working on SIM900 stm32 interfacing.

Firstly, I communicated SIM900 with computer, using hyperterminal. It is succesfull, so GSM module is OK. I removed echo messages permamently, and setted baudrate to 9600, It is also permamently. I saved this setting with AT&W command

now. I want to communicate with stm32. It is also working, but receiving data writen false on LCD. I think, This is delay problem. I tried all combination of delay, but still same problem

My GSM modem is http://gsmkontrol.blogspot.com.tr/

MY board is STM3210Ceval board

they are communicating via rs232

some part of my codes.

while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

USART_SendData(USART2, 65); // A

while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

USART_SendData(USART2, 84); // T

while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

USART_SendData(USART2, 13); // CR

while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);

re[0] = USART_ReceiveData(USART2);

while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);

re[1] = USART_ReceiveData(USART2);

LCD_DisplayStringLine(Line5,re);

#think!

Andrew Neil · ‎2014-03-27

Posted on March 28, 2014 at 01:26

''data writen false on LCD''

What, exactly, do you mean by that?

''I think, This is delay problem''

On what basis do you think that?

''I tried all combination of delay, but still same problem''

Doesn't that tend to suggest, then, that it is not a delay problem...?!

''LCD_Display

String

Line( Line5, re );''

I think there's a clue in the name here - does re constitute a valid

string

in the 'C' programming language...?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.