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why don't you try to use an oscilloscope to verify the output from the serial of your modem? rs232 is not really used by your modem, in fact its output can either be a cmos level or a ttl level, that is why I mentioned you need a ttl to rs232 converter to hook your modem to a computer, assuming...
there are two things you have to do, well as for the modem (sim900d), you have to test it via the hyperterminal, chances are it is not working properly, you need a ttl to rs232 converter to attach it to the serial port of the computer, then test if you can receive a response from the modem, then...
Thanks for the reply, apparently upon testing it several times I have already proven that it functions at 57600 baud rate so that means I'm definitely getting a 48MHz FOSC. I tested the config via hyperterminal. Thanks for the reply anyways. I also read in the datasheet of pic18f4550 that once...
Ah try this one, I learned a few tricks while abruptly testing my sim900d. Check your power source, if your using 5V 1.5A power supply, it might not be enough, during bootup and the sim900D is connecting to a network it consumes a lot of power as a result if you have insufficient power it will...
I have the following config for my pic18f4550 running on a 8MHz oscillator
#pragma config FOSC = HSPLL_HS //type of oscillator
#pragma config PLLDIV = 2
#pragma config WDT = OFF //disable watch dog timer
#pragma config LVP = OFF //disable low voltage programming
what I'm wondering is what my...
ah ok I'll send a code
#include <usart.h>
#include <p18f4550.h>
#pragma config FOSC = HSPLL_HS //HS oscillator, PLL enabled, HS used by USB
#pragma config PLLDIV = 2 //this is used to get 4Mhz out of a 8Mhz xtal and multiply it to 96Mhz
#pragma config WDT = OFF //disable watch dog timer...
how do I update the firmware of sim900d? i've got a broken ATE0, everytime I issue this command, my gsm stops from responding, and to think that I issue that using hyperterminal.
sir, actually it is possible to sync sim900d with hyperterminal just by inputting "A" at the window.
I have a question though.
This code works perfectly with sim340
void commitGSMSendMessage(char eventMessage[]){
initUSART();
delay(8000000);
sendUART_rom(gsmSendSMSMessage)...
actually the baudrate is not an issue especially in hyperterminal, so long as the gsm is set at AT+IPR=0, there will be no problem at all, anyways, does anybody here know why sim900d screws up everytime ATE0 is issued, my gsm sure does, I have to reset the gsm for it to function again.
just make sure that you haven't issued this command ATE0&W, my sim900d malfunctions every now and then I issue ATE0, anyways if ever you have, then there is a work around, during boot-up of the gsm there is at least 3 seconds to type this command ATE1, then wait for a response, OK should appear...
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