| ??? 01/02/05 15:31 Read: times |
#84227 - OS? Threads?! Responding to: ???'s previous message |
I think there must be some way to embedd operating syatem on mcu and use threads in it.Then it wont be a big problem. THEN it will be the REAL problem. I don't think you fully understand the performance of a '51 based system, and timing requirements of serial communication. A reasonable OS like Linux, on fast computers like P4 3GHZ still assures the longest delay between thread calls to be no longer than 0.1s. An OS on a 1MHZ MCU will create enough overhead to completely cripple all the timing issues.Software UART requires a very precise timing and there is no way it could achieve that in an OS environment. Only a standalone dedicated application can control the timing of subroutines precisely enough. A single switch to context of thread of the serial readout will take as long as transfer of several bits of the data - and you'd need switching several times during a single bit state to achieve the oversampling! An OS is a solution to some problems in '51. Not this one though. |
| Topic | Author | Date |
| Polling/Interrupt For Serial Input | 01/01/70 00:00 | |
| bible time | 01/01/70 00:00 | |
| Soft UART | 01/01/70 00:00 | |
| Hardware? | 01/01/70 00:00 | |
| SW UART is not a taboo! | 01/01/70 00:00 | |
| yes... | 01/01/70 00:00 | |
| think before you do | 01/01/70 00:00 | |
| Use oversampling | 01/01/70 00:00 | |
| soft UART | 01/01/70 00:00 | |
| Half bits | 01/01/70 00:00 | |
| Oversampling | 01/01/70 00:00 | |
| It's not so bad | 01/01/70 00:00 | |
| Oh yes it is! | 01/01/70 00:00 | |
| Haven't read it completely? | 01/01/70 00:00 | |
| neither have I | 01/01/70 00:00 | |
| Sure you did not! | 01/01/70 00:00 | |
| did I miss it | 01/01/70 00:00 | |
| Problem displaying posts? | 01/01/70 00:00 | |
| sure that will work | 01/01/70 00:00 | |
| NOT A PIC | 01/01/70 00:00 | |
| Just forget 89c51 then. | 01/01/70 00:00 | |
| @Erik | 01/01/70 00:00 | |
| ...all said already. | 01/01/70 00:00 | |
| OS? Threads?! | 01/01/70 00:00 | |
| Appnote to read | 01/01/70 00:00 | |
| threads | 01/01/70 00:00 | |
Problem Solved | 01/01/70 00:00 |