16c745 printf

[young]

In this 16c745 chip there is RX, TX as well as D+, D-, I think they all use printf, out, puts and getc, gets() to send and receive data from another computer or PIC, so how to separate them, I mean how can I know it is RS232 communication or USB communication? an dHow can specify to do RS232 communication and USB communication?

By the way, My best wishes for a Merry Christmas and Happy new year for every one in this forum, special thanks to Mark, PCM, SherpaDoug, rwyoung, dyeatman,ckielstra,Humberto, John Morley, rnielsen, Haplo, padamo, etc.......... Thank you for helping me when I was lost in my PIC advantures. I find a lot of fan to being with you! and Hope you guys continue to helping me in the coming new year!

[PCM programmer]

Look in the CCS manual for functions that work with the RS232 pins,
such as printf, putc, getc, kbhit, etc.

Look in the CCS example file, USB.C, for functions that work with
the USB pins, such as usb_puts, usb_gets, usb_kbhit, etc.

[hillcraft]

USB is not documented in the manuals. USB does not use the standard RS232 print and get functions.

Here is a code snippet that shows the difference.

while (true) {
cKey = 0;

if (kbhit(PORT_PC))
cKey = fgetc(PORT_PC);

usb_put_packet(1, USB_OUT_DATA, USB_EP1_TX_SIZE, TOGGLE);
....

You must take a look at the USB drivers and examples supplied with CCS.

Another thing to do to get going quickly is to study the HID USB implentation. All the documents are available for download at www.usb.org

[young]

usb_puts(int8 endpoint, int8 * ptr, int16 len,int8 packet_size,int8 timeout);
usb_gets(int8 endpoint, int8 * ptr, int8 max);
usb_put_packet(int8 endpoint, int8 * ptr, int8 len,PID_TOGGLE tg1);
usb_get_packet(int8 endpoint, int8 * ptr, int8 max);

I learn from the sample to send data as int8 and the function are defined as int8.

first of all, all data all define as int8 *ptr, this is good for int8 data, how about char string[length], if I want to send data as "this is a test for usb", how should I do it,

second what is the difference between usb_put_packet() and usb_puts();
usb_gets() and usb_get_packet(), please provide short examples

[Mark]

[young]

Thank you Mark:
usb_put_packet() sends one packet to the host, a packet is 8 byte maximum right, so if I send some string less that 8 byte, I should use usb_put_packet(), if I am sending some string large than 8 byte as "try usb123.9", I should use
char data[13]="try usb123.9"
usb_puts(EP1,(int8*)data,13,2,50);

because data has 13 byte include end of the string, and since it is 13, it will be in 2 packets, and timeout could be what ever? Am I right, please correct me?

[Mark]

I haven't used the CCS USB (or any other except the FTDI chip) so I will let someone else answer that.

[young]

Hi: hillcraft and PCM:

Would you please give some advice on this question? I really get confused by this four functions and the relationship between packet and message, and byte?

[young]

It looks like that packet_size is a number from 0-8
for the exmple I gaven it should be

usb_puts(EP1,data,packet_size,0); size could be any number from 1 to 8, right?