| Andy Neil 06/27/09 03:02 Read: 217 times Basingstoke Uk |
#166518 - I didn't say that Responding to: Giang Ho's previous message |
Giang Ho said:
Thanks Andy, I only call from ISR during testing because it can provide delay time between sending. Take a look at this thread for an example of doing a "software" delay timer: http://www.8052.com/forum/read/166323 why I can not call printf in any where rather than in main() or interrupt ??? I didn't say that. I said you can't call it from an ISR and any other part of your program - there is no particular restriction to calling only within main. The point is that printf is not reentrant; therefore it must not be called simultaneously from multiple places. In fact, unlike "normal" 'C' compilers, functions in Keil C51 are inherently not reentrant - so you can't call any C51 function simultaneously from multiple places. |
| Topic | Author | Date |
| CMP-10 thermal printer & 8051 | Giang Ho | 06/13/09 08:47 |
| Printer settings | Hal Albach | 06/13/09 10:27 |
| Some hints/advice.. | Valentin Angelovski | 06/13/09 11:11 |
| I sent commands like "BEL", or "ESC RS" | Andy Neil | 06/13/09 11:14 |
| ASCII table | Per Westermark | 06/13/09 13:58 |
| HyperTerminal & ASCII code | Giang Ho | 06/13/09 18:56 |
| Would it be realistic.... | Michael Karas | 06/13/09 21:45 |
| Not text, | Per Westermark | 06/14/09 01:54 |
| Not text, | Giang Ho | 06/14/09 03:08 |
| Spend more time with the ASCII table. | Per Westermark | 06/14/09 03:35 |
| Still fail to test the printer | Giang Ho | 06/18/09 07:37 |
| The printer is working | Giang Ho | 06/18/09 09:04 |
| ASCII char on HyperTerminal | Mahesh Joshi | 06/20/09 07:11 |
| Re: ASCII char on HyperTerminal | Giang Ho | 06/21/09 09:16 |
| ASCII char on HyperTerminal | Mahesh Joshi | 06/20/09 07:11 |
| Is that guaranteed? | Andy Neil | 06/20/09 13:15 |
| I use it that way | Mahesh Joshi | 06/22/09 01:28 |
| XOn/XOff set on MCU side | Giang Ho | 06/18/09 22:08 |
| You have to do it yourself | Andy Neil | 06/19/09 01:36 |
| Re:You have to do it yourself | Giang Ho | 06/21/09 08:57 |
| Intern? [edited] | Andy Neil | 06/24/09 03:00 |
| HyperTerminal and microcontroller - please help! | Giang Ho | 06/23/09 10:36 |
| HyperTerminal and microcontroller - please help! | Giang Ho | 06/23/09 19:07 |
| May be I need to use cross over serial cable | Andy Neil | 06/24/09 03:03 |
| Use printf to output to UART, but receive incorrect data | Giang Ho | 06/24/09 10:09 |
| Re: Use printf to output to UART, but receive incorrect dat | Giang Ho | 06/24/09 10:13 |
| printf only can output value from 256 to 32767 correctly | Giang Ho | 06/25/09 07:42 |
| Hasn't Maarten already explained this? | Andy Neil | 06/25/09 07:54 |
| Re: Hasn't Maarten already explained this? | Giang Ho | 06/25/09 08:31 |
| Show it! | Andy Neil | 06/25/09 09:08 |
| Re: Show it | Giang Ho | 06/25/09 19:48 |
| use a cast | Maarten Brock | 06/24/09 16:11 |
| or RTFM | Andy Neil | 06/24/09 17:06 |
| Re: RTFM | Giang Ho | 06/25/09 19:55 |
| I found the solution. Thanks | Giang Ho | 06/26/09 08:46 |
Direct Memory?  | Andy Neil | 06/26/09 09:03 |
| Re: Direct memory | Giang Ho | 06/26/09 09:21 |
| Definitely a BAD Idea! | Andy Neil | 06/26/09 09:43 |
| Re:Definitely a BAD Idea! | Giang Ho | 06/26/09 10:01 |
| Could you please suggest? | Andy Neil | 06/26/09 10:25 |
| Re: Do not call from ISR | Giang Ho | 06/26/09 18:19 |
| I didn't say that | Andy Neil | 06/27/09 03:02 |
Thanks! | Giang Ho | 06/27/09 09:10 |
| Re: use a cast | Giang Ho | 06/24/09 19:47 |