Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
06/25/09 12:54
Read: times


 		 #166455 - Hasn't Maarten already explained this?
Responding to: ???'s previous message
See: http://www.8052.com/forum/read/166431

Giang Ho said:
I have tried to send the data (unsigned char)...

What is the size of an unsigned char, in bytes?



I found out that if I send the data value in between:

a. 256 to 32767, I will get correct result on the PC's terminal.

b. 255 and less than, I will get garbage on the terminal (e.g. if 255, get 65535, or if 254 get 512)

c. 32768 and more than, I get 0 on the terminal.

What is the maximum range of values that a variable of type unsigned char can hold?

Note that I am using Keil uVsion3.

Note that the Keil Documentation contains specific notes & guidance about using printf with single-byte values...




List of 44 messages in thread
TopicAuthorDate
CMP-10 thermal printer & 8051            01/01/70 00:00      
   Printer settings            01/01/70 00:00      
   Some hints/advice..            01/01/70 00:00      
   I sent commands like "BEL", or "ESC RS"            01/01/70 00:00      
      ASCII table            01/01/70 00:00      
      HyperTerminal & ASCII code            01/01/70 00:00      
         Would it be realistic....            01/01/70 00:00      
         Not text,            01/01/70 00:00      
            Not text,            01/01/70 00:00      
               Spend more time with the ASCII table.            01/01/70 00:00      
                  Still fail to test the printer            01/01/70 00:00      
                     The printer is working            01/01/70 00:00      
                     ASCII char on HyperTerminal            01/01/70 00:00      
                        Re: ASCII char on HyperTerminal            01/01/70 00:00      
                     ASCII char on HyperTerminal            01/01/70 00:00      
                        Is that guaranteed?            01/01/70 00:00      
                           I use it that way            01/01/70 00:00      
   XOn/XOff set on MCU side            01/01/70 00:00      
      You have to do it yourself            01/01/70 00:00      
         Re:You have to do it yourself            01/01/70 00:00      
            Intern? [edited]            01/01/70 00:00      
   HyperTerminal and microcontroller - please help!            01/01/70 00:00      
      HyperTerminal and microcontroller - please help!            01/01/70 00:00      
         May be I need to use cross over serial cable            01/01/70 00:00      
   Use printf to output to UART, but receive incorrect data            01/01/70 00:00      
      Re: Use printf to output to UART, but receive incorrect dat            01/01/70 00:00      
         printf only can output value from 256 to 32767 correctly            01/01/70 00:00      
            Hasn't Maarten already explained this?            01/01/70 00:00      
               Re: Hasn't Maarten already explained this?            01/01/70 00:00      
                  Show it!            01/01/70 00:00      
                     Re: Show it            01/01/70 00:00      
      use a cast            01/01/70 00:00      
         or RTFM            01/01/70 00:00      
            Re: RTFM            01/01/70 00:00      
            I found the solution. Thanks            01/01/70 00:00      
               Direct Memory?            01/01/70 00:00      
                  Re: Direct memory            01/01/70 00:00      
                     Definitely a BAD Idea!            01/01/70 00:00      
                        Re:Definitely a BAD Idea!            01/01/70 00:00      
                           Could you please suggest?            01/01/70 00:00      
                              Re: Do not call from ISR            01/01/70 00:00      
                                 I didn't say that            01/01/70 00:00      
                                    Thanks!            01/01/70 00:00      
         Re: use a cast            01/01/70 00:00      

Back to Subject List