| ??? 02/15/05 13:03 Read: times |
#87502 - The problem may be.... Responding to: ???'s previous message |
SENDSPI: ; sends the value in ACC out the SPI port. also ; receives simultaneously into SPIDAT. SPI interrupt ; is triggered when transfer is complete. CLR SS ; must pull slave's SS pin low first MOV SPIDAT,OUTPUT ; trigger data transfer ; ; you must wait for the transfer to complete! ; I don't have the datasheet handy, so I can't give a ; complete answer! ; SETB SS ;this gets set AFTER the transfer has completed! RET With SPI, the SS (or CS) signal must be active for the whole transaction. Since you have hardware SPI to shift the data bits out, you must poll a status bit for this hardware to tell you when the data has actually been sent, then put SS high. I think this might go some way to solving your problem |
| Topic | Author | Date |
| acdu812 and spi. program question | 01/01/70 00:00 | |
| Try | 01/01/70 00:00 | |
| CS in SPI | 01/01/70 00:00 | |
| thanks.. but.... | 01/01/70 00:00 | |
| Sorry | 01/01/70 00:00 | |
| The problem may be.... | 01/01/70 00:00 | |
re:SPI on ADuC812 | 01/01/70 00:00 |