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Forum Index : Microcontroller and PC projects : Serial test

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vk4tec

Senior Member

Joined: 24/03/2012
Location: Australia
Posts: 239
Posted: 05:37am 04 Jan 2013
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Interesting result

open "com2:4800" as #1
do
print loc(#1) ' print rx buffer size
loop

Gets up to "127" and maxes out

//

open "com2:4800,2048" as #1
do
print loc(#1) ' print rx buffer size
loop

Gets up to "255" and maxes out

- Andrew -
Andrew Rich VK4TEC
www.tech-software.net
 
CircuitGizmos

Guru

Joined: 08/09/2011
Location: United States
Posts: 1425
Posted: 05:46am 04 Jan 2013
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Which version of MMBasic is this? 4.2?
Micromites and Maximites! - Beginning Maximite
 
vk4tec

Senior Member

Joined: 24/03/2012
Location: Australia
Posts: 239
Posted: 06:00am 04 Jan 2013
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MMBasic Version 4.0B

I have something else intersting.

I am reading from a GPS.

I think the PIC is too fast ( if that is feasable )

If I read two bytes really quickly, sometimes they come out null.

Or one is populated and the second is not.

If I slow down the read with a pause 10, I can get 100% read rate from the com port.

I think I need to check if there are some characters to read first .

LOC(#1)

- Andrew -
Andrew Rich VK4TEC
www.tech-software.net
 
vk4tec

Senior Member

Joined: 24/03/2012
Location: Australia
Posts: 239
Posted: 06:05am 04 Jan 2013
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not quite sure how to code that one

do while loc(#1) = 0 : loop

- Andrew - Edited by vk4tec 2013-01-05
Andrew Rich VK4TEC
www.tech-software.net
 
CircuitGizmos

Guru

Joined: 08/09/2011
Location: United States
Posts: 1425
Posted: 06:37am 04 Jan 2013
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  vk4tec said  
open "com2:4800" as #1
do
print loc(#1) ' print rx buffer size
loop

Gets up to "127" and maxes out


I've duplicated these results on 4.2.
Micromites and Maximites! - Beginning Maximite
 
vk4tec

Senior Member

Joined: 24/03/2012
Location: Australia
Posts: 239
Posted: 07:35am 04 Jan 2013
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I did a dumb thing

Threw my GPS from 19200 to 38400 baud

And of course the PIC on this port does not do 38400

Out with the serial port PC

- Andrew -
Andrew Rich VK4TEC
www.tech-software.net
 
JohnS
Guru

Joined: 18/11/2011
Location: United Kingdom
Posts: 3802
Posted: 12:49pm 04 Jan 2013
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255 may be related to the max string size

(though it probably should not be)

John
 
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