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bmete
Joined: 13 Jul 2023
Posts: 37
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 Posted: Mon Jul 24, 2023 7:26 am |
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Hello friends, first of all thanks for your interests.
Ttelmah:
Actually, I was going to use the hardware RS232 pins to drive the LED, and the other RS485 pins that I defined as software (B5/B4) would be used to communicate with other boards. But I made a mistake. The code I shared above is completely wrong. The configuration I want to do is actually this:
| Code: |
#use delay(clock = 32M)
//port1
#use rs232(stream = LED_STREAM, baud = 8000000, xmit = PIN_C6, rcv = PIN_C7, bits = 8, parity = N, stop = 0, ERRORS, INVERT)
//port2
#define RS485_USE_EXT_INT FALSE
#define RS485_RX_PIN PIN_B5
#define RS485_TX_PIN PIN_B4
#define RS485_ID 0
#include <rs485.c>//NOTE: only one RS485 port is supported by the driver
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Configuration should be like that. After compiling the code without error, I was able to drive the LEDs, but I haven't done rs485 communication over the B5 and B4 pins yet. Thinking that I don't need a very high connection speed during RS485 communication, I allocated software pins to communication and hardware pins to drive LEDs.
temtronic:
Thank you, I searched the keyword and I found something useful, but I'm racing against time, so I need to run the system somehow in minimum time. If I don't get a result from the other method, I will switch to the bit banging method. Thanks for your support.
Last edited by bmete on Tue Jul 25, 2023 11:42 pm; edited 1 time in total |
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drolleman
Joined: 03 Feb 2011
Posts: 116
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| Posted: Tue Jul 25, 2023 3:17 pm |
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I wrote mine in assembly to make it work at 64mhz, 40mhz or less won't work, too slow. Also use #defines, it will make your life easier. 64 / 4 is 16m instructions / sec not very fast.
David |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19539
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| Posted: Wed Jul 26, 2023 1:11 am |
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Yes.
This is why cheating and using the SPI or UART to do the actual bit timing
is the way to go. Even doing this, you have to be quite careful on fetching
the bytes, to avoid gaps in the data stream. |
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