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Discussion Groups | BasicX | portA, Bit0-Bit7
Discussion forum for the BasicX family of microcontroller chips.
portA, Bit0-Bit7 - David Sousa Mendes - Jan 14 7:39:49 2008
Hello fellows
In Parallax BasicStamp one can define the logic state of 8 pins using something like: %11100111
Can we do something similar in BasicX?
Looking at the Hardware Reference Manual, pag 14 - "BX24 Pin Definitions", we see that pin 13-pin 20 have as Primary Function : portA, Bit0-Bit7
How can I use this function?
Thanx
David M.
[Non-text portions of this message have been removed]
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In Parallax BasicStamp one can define the logic state of 8 pins using something like: %11100111
Can we do something similar in BasicX?
Looking at the Hardware Reference Manual, pag 14 - "BX24 Pin Definitions", we see that pin 13-pin 20 have as Primary Function : portA, Bit0-Bit7
How can I use this function?
Thanx
David M.
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: portA, Bit0-Bit7 - Ian Casey - Jan 14 12:14:35 2008
David Sousa Mendes wrote:
> Hello fellows
> In Parallax BasicStamp one can define the logic state of 8 pins using something like: %11100111
>
> Can we do something similar in BasicX?
> Looking at the Hardware Reference Manual, pag 14 - "BX24 Pin Definitions", we see that pin 13-pin 20 have as Primary Function : portA, Bit0-Bit7
>
> How can I use this function?
> Thanx
>
> David M.
>
David,
See Special purpose registers in the Operating system reference.
You'll need to check with the device data sheet for the exact purpose of
each register.
PINA Input Pins, Port A
DDRA Data Direction Register, Port A
PORTA Data Register, Port A
from a previous post:
Register.DDRA = bx0000_0001 will set pin 20 high.
Ian
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
> Hello fellows
> In Parallax BasicStamp one can define the logic state of 8 pins using something like: %11100111
>
> Can we do something similar in BasicX?
> Looking at the Hardware Reference Manual, pag 14 - "BX24 Pin Definitions", we see that pin 13-pin 20 have as Primary Function : portA, Bit0-Bit7
>
> How can I use this function?
> Thanx
>
> David M.
>
David,
See Special purpose registers in the Operating system reference.
You'll need to check with the device data sheet for the exact purpose of
each register.
PINA Input Pins, Port A
DDRA Data Direction Register, Port A
PORTA Data Register, Port A
from a previous post:
Register.DDRA = bx0000_0001 will set pin 20 high.
Ian
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: portA, Bit0-Bit7 - Tom Becker - Jan 14 12:49:32 2008
> from a previous post:
> Register.DDRA = bx0000_0001 will set pin 20 high.
Well, that post is not correct. register.DDRn sets the port pin
directions, input or output - not the state of the pins, which can be
set with the corresponding register.PORTn.
To set port pins pin 5 through 12 (Port C) to input, use:
Register.DDRC = 0
or to set pins 17 through 20 as outputs (and pins 13 through 16 as
inputs), use:
Register.DDRA = bx0000_1111
Then, to actually set the output pin states, set register.PORTn (for
example,
Register.PORTA = bx0000_0101
sets pins 17 and 19 low, and pins 18 and 20 high).
Tom
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> Register.DDRA = bx0000_0001 will set pin 20 high.
Well, that post is not correct. register.DDRn sets the port pin
directions, input or output - not the state of the pins, which can be
set with the corresponding register.PORTn.
To set port pins pin 5 through 12 (Port C) to input, use:
Register.DDRC = 0
or to set pins 17 through 20 as outputs (and pins 13 through 16 as
inputs), use:
Register.DDRA = bx0000_1111
Then, to actually set the output pin states, set register.PORTn (for
example,
Register.PORTA = bx0000_0101
sets pins 17 and 19 low, and pins 18 and 20 high).
Tom
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Re: Re: portA, Bit0-Bit7 - David Sousa Mendes - Jan 14 16:28:32 2008
Thanx a lot!
BR
David M.
----- Original Message -----
From: Tom Becker
To: b...@yahoogroups.com
Sent: Monday, January 14, 2008 4:40 PM
Subject: [BasicX] Re: portA, Bit0-Bit7
> from a previous post:
> Register.DDRA = bx0000_0001 will set pin 20 high.
Well, that post is not correct. register.DDRn sets the port pin
directions, input or output - not the state of the pins, which can be
set with the corresponding register.PORTn.
To set port pins pin 5 through 12 (Port C) to input, use:
Register.DDRC = 0
or to set pins 17 through 20 as outputs (and pins 13 through 16 as
inputs), use:
Register.DDRA = bx0000_1111
Then, to actually set the output pin states, set register.PORTn (for
example,
Register.PORTA = bx0000_0101
sets pins 17 and 19 low, and pins 18 and 20 high).
Tom
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
BR
David M.
----- Original Message -----
From: Tom Becker
To: b...@yahoogroups.com
Sent: Monday, January 14, 2008 4:40 PM
Subject: [BasicX] Re: portA, Bit0-Bit7
> from a previous post:
> Register.DDRA = bx0000_0001 will set pin 20 high.
Well, that post is not correct. register.DDRn sets the port pin
directions, input or output - not the state of the pins, which can be
set with the corresponding register.PORTn.
To set port pins pin 5 through 12 (Port C) to input, use:
Register.DDRC = 0
or to set pins 17 through 20 as outputs (and pins 13 through 16 as
inputs), use:
Register.DDRA = bx0000_1111
Then, to actually set the output pin states, set register.PORTn (for
example,
Register.PORTA = bx0000_0101
sets pins 17 and 19 low, and pins 18 and 20 high).
Tom
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )