| Erik Malund 06/16/09 08:55 Read: 245 times Mt Airy, Nc USA |
#166144 - oh boy what a load who wil have 10 minutes for this Responding to: David Prentice's previous message |
1. He has to calculate the TH and TL according to his F_CPU
2. He has to have a timer ISR() and IRQs enabled 3. He can then read the current time, add his delay, and poll for this time to be reached. Taking account of overflows, missing ticks and atomicity of reads etc. 1) in your misapplied compiler 'example' the delay loop must be calculated as well 2) a bits and 4 lines of code 3) no atomiticty issue use a char, if a char is not enough then a counter in the non IST that is decremented when the ISR time flags 'done' Erik |
| Topic | Author | Date |
| s/w delay function | Sandeep Gupta | 06/02/09 00:50 |
| Software loops can be optimized away | Per Westermark | 06/02/09 01:07 |
| lacks side-effects | Neil Kurzman | 06/02/09 01:07 |
| First time with LINT? | Andy Neil | 06/02/09 01:19 |
| lacks side-effects | Andy Neil | 06/02/09 01:07 |
| That does not mean it is an error. | Neil Kurzman | 06/02/09 01:12 |
| It also blocks | Jez Smith | 06/02/09 01:49 |
| How to post legible source code | Andy Neil | 06/02/09 01:13 |
| DELAY_0.1.ZIP Useful? | Murray R. Van Luyn | 06/14/09 22:11 |
| That doesn't help, and it won't work anyhow! | Andy Neil | 06/15/09 01:54 |
| I stand by it. | Murray R. Van Luyn | 06/15/09 19:21 |
| Yes a delay function is useful | David Prentice | 06/16/09 02:39 |
| wrong !!!! | Erik Malund | 06/16/09 08:46 |
| No, that's precisely where you're wrong | Andy Neil | 06/16/09 12:35 |
| How can you say that? | Andy Neil | 06/16/09 12:43 |
| I think you should read Murray's comments | David Prentice | 06/16/09 15:20 |
| I have seen ... | Erik Malund | 06/16/09 15:45 |
Timers usable without start/stop too  | Per Westermark | 06/16/09 16:30 |
| free-running counter/timer | Andy Peters | 06/18/09 17:30 |
| Unsigned integers | Per Westermark | 06/18/09 17:39 |
| re: unsigned | Andy Peters | 06/19/09 12:16 |
| Try unsigned subtraction with borrow | Per Westermark | 06/19/09 13:05 |
bug in second (improved!?) code block | Andy Peters | 06/19/09 16:38 |
| Delay Loops in 'C'..!!! NO | Mahesh Joshi | 06/16/09 05:44 |
| Go on. Suggest a SIMPLE alternative | David Prentice | 06/16/09 06:20 |
| My Methods | Mahesh Joshi | 06/16/09 07:21 |
| So he has a long list of constraints | David Prentice | 06/16/09 07:46 |
| oh boy what a load who wil have 10 minutes for this | Erik Malund | 06/16/09 08:55 |
| Ok. I was being naughty. | David Prentice | 06/16/09 10:28 |
| you forget the obvious ... | Erik Malund | 06/16/09 10:49 |