| ??? 10/31/11 20:43 Read: times |
#184493 - SPI analysis is made, results? Responding to: ???'s previous message |
Since all this analysis is made, the solution is just before your eyes.
The time spent for this kind of excelent depth show of how SPI works brings the solution up. It is obvious that some of current members have the strength to write and present the ASM routines for the SPI slave for AT89S52. Since the OP mentioned that there are plenty of them available, the most possible is that SPI master will be also an AT89S52. This mcu does not have a hardware SPI either as master or slave. The only SPI interface available is for programming the internal code flash memory using a proprietary ISP prototol from Atmel. But it has INT0, INT1 and three timers with the most valuable T2 for this kind of operations. A case as such the OP asked for soft SPI slave using AT89S52 is just another enigma, can be solved for a particular case ? can be leveraged to more general solution ? Does anyone have spare time to scratch his head and solve another puzzle ? The case is not to use another microcontroller with H/W SPI peripheral, but how to teach this old one to do new tricks. |
| Topic | Author | Date |
| SPI Slave in 89S52 | 01/01/70 00:00 | |
| Get real processor | 01/01/70 00:00 | |
| Topic Author Date | 01/01/70 00:00 | |
| Big problem | 01/01/70 00:00 | |
| Look for a different model | 01/01/70 00:00 | |
| Try 8051 BASCOM | 01/01/70 00:00 | |
| at what speed | 01/01/70 00:00 | |
| Interpreters have an easier life. | 01/01/70 00:00 | |
| Soft SPI speed | 01/01/70 00:00 | |
| But how to combine that loop with a real program? | 01/01/70 00:00 | |
| and more | 01/01/70 00:00 | |
| Software master trivial - slave is not | 01/01/70 00:00 | |
| SPI analysis is made, results? | 01/01/70 00:00 | |
| There _may_ be a solution - but maybe not acceptable | 01/01/70 00:00 | |
| sure, and so what? | 01/01/70 00:00 | |
| SPI at 100Kbps | 01/01/70 00:00 | |
| Still gives puny transfer rate with significant limitations | 01/01/70 00:00 | |
| the answer is | 01/01/70 00:00 | |
| Fully Interlocked Handshaking. | 01/01/70 00:00 | |
Quite common | 01/01/70 00:00 |