usart rs232

[trigstig]

can some one help, i would like to send data from the terminal tool to the pic16f877a, when the pic receives the data
one byte at a time i need to write it to the eeprom similar to this

for x := 1 to 20
begin
Eeprom_write(x,Usart_read);
end;

all i am getting is one byte written to all addresses how do get "hello world"
split over the eeprom addresses
ie
address 1 = h
address 2 = e
address 3 = l
etc etc..

thanks in advance

[janni]

all i am getting is one byte written to all addresses

No wonder, your code does exactly this. What is Usart_read? A char, a string?

[trigstig]

usart_read is taken from the example given it started of recieved_byte := usart_read after data ready test

[janni]

usart_read is taken from the example given it started of recieved_byte := usart_read after data ready test

Then it's of byte type and your code writes the same byte to all EEPROM cells.

when the pic receives the data one byte at a time i need to write it to the eeprom

Unless you send single chars only, that's not possible as writing byte to EEPROM takes more time than receiving a byte (at least for reasonable serial communication speed).
You'd have to receive whole message first and collect it in a string or array of chars and only then store it in EEPROM.

You could try to use UARTx_Read_Text procedure which will wait for whole message.

[trigstig]

thats ok but the method you describe "UARTx_Read_Text" only allows 20 char i need to split 120 bytes
unless theres a way of increasing the size.

[Dany]

can some one help, i would like to send data from the terminal tool to the pic16f877a, when the pic receives the data
one byte at a time i need to write it to the eeprom similar to this

for x := 1 to 20
begin
Eeprom_write(x,Usart_read);
end;

all i am getting is one byte written to all addresses how do get "hello world"
split over the eeprom addresses
ie
address 1 = h
address 2 = e
address 3 = l
etc etc..

thanks in advance

You should check first (with e.g. function UARTx_Data_Ready) if a byte did come in via uart before writing it to eeprom.

[janni]

thats ok but the method you describe "UARTx_Read_Text" only allows 20 char i need to split 120 bytes unless theres a way of increasing the size.

Then you'll have to do it yourself, receiving and storing the message in a string or array of chars byte-by-byte. Only then you may store it in EEPROM.
And take into account that storing 120 bytes may take as long as one second

[trigstig]

i will try a few things let you know if i am succesfull. thanks for input.

[janni]

You could switch to the PRO version of mP. UARTx_Read_Text allows there for longer strings.