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| daddesio | Does anyone know the proper timing to send an infinite stream of "AAAAA..." over uart to a pc? I'm sending "010000010101000001010100000101..." with a 9600Hz clock (9600 bits per second) -- I confirmed this in both gtkwave and the oscilloscope at my workplace -- but "sudo screen /dev/ttyUSB0 9600" is completely blank. | 18:25 |
|---|---|---|
| daddesio | And yes, I connected my fpga's output pin to the *receiver* pin on my usb uart (the white pin: https://www.amazon.com/JBtek-WINDOWS-Supported-Raspberry-Programming/dp/B00QT7LQ88/ref=pd_sim_23_1?_encoding=UTF8&pd_rd_i=B00QT7LQ88&pd_rd_r=QJP4C1ZQPZ0EFDHNJ3H7&pd_rd_w=RN35t&pd_rd_wg=ZIzwk&psc=1&refRID=QJP4C1ZQPZ0EFDHNJ3H7 ) | 18:26 |
| mazzoo | start and stop bits? | 18:27 |
| daddesio | I can insert more 1s in between characters, like "0100000101 1111111111 0100000101 1111111111", but it doesn't make a difference | 18:27 |
| daddesio | I'll see if I can output the same signal from my usb uart and compare with my fpga output. | 18:29 |
| mazzoo | perl -e "print 'A' x 9001" > /dev/ttyUSB0 | 18:30 |
| mazzoo | after setting the baud with stty | 18:30 |
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| daddesio | Figured it out! I was passing the 12MHz clock to my module by mistake instead of the 9600Hz clock that I calculated. | 19:32 |
| daddesio | so "I confirmed this on my oscilloscope" was wrong. | 19:32 |
| daddesio | I only confirmed the 9600Hz clock and 9600Hz square wave were right, not my new 9600 baud "A" generator. | 19:33 |
| daddesio | Aha, the issue is in my pcf file: set_io clk 21 | 19:34 |
| mazzoo | jfyi: FTDI USB UARTs work up to 3MHz | 19:34 |
| mazzoo | real world cable limits make 2MHz possible | 19:35 |
| daddesio | I renamed the variable recently, so it should say set_io clk_12mhz 21 now | 19:35 |
| awygle | or you can run Fast Serial at 50 MHz :p | 19:35 |
| mazzoo | awygle: what is Fast Serial? | 19:41 |
| awygle | mazzoo: http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT2232H.pdf page 51 | 19:41 |
| awygle | it's basically a UART+Clock | 19:42 |
| awygle | perhaps a USRT | 19:42 |
| awygle | or if you prefer, like SPI without the slave output | 19:42 |
| awygle | although that analogy's not as good | 19:42 |
| mazzoo | nice! never noticed that part of the datasheet... | 19:46 |
| awygle | credit goes to ZipCPU for pointing it out | 19:47 |
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| ZipCPU | awygle: Ever thought of trying it out? | 20:26 |
| awygle | ZipCPU: i think of lots of things :) | 20:39 |
| awygle | i haven't yet had occasion to though, no | 20:39 |
| ZipCPU | Yeah, me neither. | 20:40 |
| ZipCPU | I've wanted to though. | 20:40 |
| ZipCPU | It was a Pennsylvania engr who pointed the capability out to me. | 20:42 |
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