USB Serial Receive

[Rich]

I am new to Flowcode, so I appoligize this may be a dumb question.

I am attempting to create a program that uses Hyperterminal to program timing functions in a PIC18f2455. For the most part the functions are working well. I have menu options that are sent from the pic to the terminal and routine allows me to select single menu option using the USBGETSTRING function. It all works fine until I get to the enter time delay routine. Getstring only allows for one character to be entered even when I set the string length to 10. If I use the GETByte function I get the byte then can "see" when enter is pressed, however since the byte are all ascii I cannot assemble them as a string, to create a multidigit number. EX 500 which gives me 53484813. How can I either convert this back to 500, or get the GET STRING function to allow me to enter more then one character within the timeout period.

My latest attempt was to assemble the bytes into a string then figured I can convert the string to an integer.

instportconv = ToString$ (instportstrex[charcntassemble])
instportstr = instportstr + instportconv

Any suggestions.

[Benj]

Hello,

Can you do something like this.

First copy the numeric bytes from the incoming string to a new temp string.

idx = start position of number in incoming string
idx2 = 0

while (string[idx] >= '0' && string[idx] <= '9')
{
temp[idx2] = string[idx]
idx = idx + 1
idx2 = idx2 + 1
}

Then convert the Ascii string to a number using the StringToInt function.

variable = StringToInt$(temp)

[Spanish_dude]

Hi,

ASCII characters are just values. Read your value from USB, either in byte array or char/string format, it doens't really matter.
Once you have your string do as follows :

Code: Select all

int i = lenght_of_received_data;
int value;

while (received_data[i] >= '0' && received_data[i] <= '9')
{
    value = value * 10 + (received_data[i] - '0');
    i--;
}

If received_data is a string containing "518" it will do the following calculation:
1) value = 0 * 10 + (53 - 48) -> value = 5
2) value = 5 * 10 + (49 - 48) -> value = 51
3) value = 51 * 10 + (56 - 48) -> value = 518

Cheers,
Nicolas

PS: Don't forget that if you receive "518\n" you need to substract 1 from the length_of_received_data or it won't execute the loop.