| ??? 08/22/05 21:12 Read: times |
#99860 - this will be a mess when you do not have Responding to: ???'s previous message |
I've never written code for a software UART and currently not sure how to implement it for my situation. As you know, I'm already using the built in UART and I'm also using one timer for a simple scheduler (which currently just scans the keypad, but I might add more to this later) and the other timer for the built in UART
This will be a mess when you do not have a free timer. Yes, you can make a bitbanged UART with programmed delay loops, but that will fail miserably when either your timer or the UART interrupts. Use an external UART (IIC or SPI coupled with FIFO) = 2 or 3 pins. E.g. Philips has some with pretty deep FIFOs. Simce your display is input only and your scanner is output only, what hinder you using the UART for both. If they can be set to the same baudrate, that should work. Erik |
| Topic | Author | Date |
| Bit-banging/software UART on a AT89C2051 | 01/01/70 00:00 | |
| this will be a mess when you do not have | 01/01/70 00:00 | |
| Re: this will be a mess when you do not | 01/01/70 00:00 | |
| now it is 3 devices | 01/01/70 00:00 | |
| Re: now it is 3 devices | 01/01/70 00:00 | |
| SW UART | 01/01/70 00:00 | |
| Re: SW UART | 01/01/70 00:00 | |
| Use a second 89C2051 | 01/01/70 00:00 | |
| you will have to anyhow | 01/01/70 00:00 | |
| The max has 2+2 drivers | 01/01/70 00:00 | |
| Some other things to think about | 01/01/70 00:00 | |
| TL16C754 software flow control question | 01/01/70 00:00 | |
what does that have to do with bit-bangi | 01/01/70 00:00 | |
| nope, there are many external UARTs ava | 01/01/70 00:00 |