| ??? 04/20/10 19:39 Read: times |
#175192 - Your times seem quite long Responding to: ???'s previous message |
To fill a 256 byte page buffer via TWI interrupts will take ~ 256 x 9 x 2.5us on a 400kHz bus. i.e. 6ms.
A page-write on most 24Cxxx eeproms takes a maximum 5ms. So you are a lot slower than DataFlash or SD cards. But IMHO the 11ms total time is not unreasonable. Bear in mind that the ISR() will take a few cycles, as will filling an IRQ buffer that feeds the ISR(). However if your 8051 is sharing the work with other peripherals and foreground code the peripherals are all quietly working with occasional service from the cpu. David. |
| Topic | Author | Date |
| I2C page write and interrupts | 01/01/70 00:00 | |
| Some Important Things to Consider | 01/01/70 00:00 | |
| Re: Some Important Things to Consider | 01/01/70 00:00 | |
| You just buffer things | 01/01/70 00:00 | |
| ISR + superloop normally enough | 01/01/70 00:00 | |
| A Quick Reply | 01/01/70 00:00 | |
| Re: A Quick Reply | 01/01/70 00:00 | |
| Confirmation | 01/01/70 00:00 | |
| The Atmel Scheduler | 01/01/70 00:00 | |
| Re: The Atmel Scheduler | 01/01/70 00:00 | |
| Your times seem quite long | 01/01/70 00:00 | |
| Re: Your times seem quite long | 01/01/70 00:00 | |
| The problem seems to be different | 01/01/70 00:00 | |
| Time to closely read data sheet. | 01/01/70 00:00 | |
| Re: Time to closely read data sheet. | 01/01/70 00:00 | |
Write a generic function. | 01/01/70 00:00 | |
| Paged operation very common | 01/01/70 00:00 |