ColdFire/68K Microcontrollers and ProcessorsのトピックConfiguring PortE on 5282

Configuring PortE on 5282

SVC2 — Tue, 05 May 2009 04:43:17 GMT

Hi,

I am trying to configure portE on 5282 without success. I would like to have PE2 and PE3 configured as output. So I am setting:

#define MCF5282_GPIO_DDRE (*(vuint8 *)(void *)(&__IPSBAR[0x100018]))
#define MCF5282_GPIO_PEPAR (*(vuint16 *)(void *)(&__IPSBAR[0x100052]))

MCF5282_GPIO_DDRE = 0x8 | 0x4;
MCF5282_GPIO_PEPAR = 0;

I am trying to toggle the pin using:

MCF5282_GPIO_PORTE |= (0x8);// set 1
MCF5282_GPIO_PORTE &= ~(0x8);// set 0

It DOES NOT work.

What I am doing wrong?

Thanks,
S.

PS: I also tried:

#define MCF5282_GPIO_SETE (*(vuint8 *)(void *)(&__IPSBAR[0x10002C]))
#define MCF5282_GPIO_CLRE (*(vuint8 *)(void *)(&__IPSBAR[0x100040]))

MCF5282_GPIO_SETE |= 0x8;
MCF5282_GPIO_CLRE |= 0x8;

Re: Configuring PortE on 5282

bkatt — Tue, 05 May 2009 20:25:23 GMT

SVC2 wrote:
Hi,
I am trying to configure portE on 5282 without success. I would like to have PE2 and PE3 configured as output. So I am setting:

(snip)

MCF5282_GPIO_DDRE = 0x8 | 0x4;
MCF5282_GPIO_PEPAR = 0;

I am trying to toggle the pin using:

MCF5282_GPIO_PORTE |= (0x8);// set 1
MCF5282_GPIO_PORTE &= ~(0x8);// set 0

It DOES NOT work.
What I am doing wrong?
Thanks,
S.

PS: I also tried:
(snip)
MCF5282_GPIO_SETE |= 0x8;
MCF5282_GPIO_CLRE |= 0x8;

If your 5282 powers up in "master" mode (with an external bus), those pins are used for SIZ[1:0] and controlled by the CCR register. This is the default even if your program never writes the CCR, and the CCR setting prevents your write to the PEPAR from having the desired effect.

Once you get past the configuration issues, the SETE and CLRE registers should be used with simple assignments. The whole idea is to make bit output easier than |= or &=~ on the PORTE register:

MCF5282_GPIO_SETE = 0x8;
MCF5282_GPIO_CLRE = 0x8;

Message Edited by bkatt on 2009-05-05 02:27 PM

Message Edited by bkatt on 2009-05-05 02:28 PM

Re: Configuring PortE on 5282

SVC2 — Tue, 05 May 2009 20:47:08 GMT

I am using the external bus (master mode)!

Those this mean I cannot use PORTE bit 3 as Digital Output?

Thanks,

Re: Configuring PortE on 5282

RichTestardi — Wed, 06 May 2009 00:02:52 GMT

Just to be safe, I believe this:

> MCF5282_GPIO_CLRE = 0x8

Should actually be:

> MCF5282_GPIO_CLRE = ~0x8

Writing a 0 clears the corresponding bit; writing a 1 has no effect.

(I assumed you wanted to clear a single bit.)

-- Rich

Re: Configuring PortE on 5282

bkatt — Wed, 06 May 2009 04:38:51 GMT

SVC2 wrote:
I am using the external bus (master mode)!

Does this mean I cannot use PORTE bit 3 as Digital Output?

If you change the CCR port first, then your configuration of PORT E should work.

Re: Configuring PortE on 5282

dhar — Sat, 30 Jan 2010 01:36:25 GMT

hi there, have you already solved this problem? I also don't have any output on PORT A.

Re: Configuring PortE on 5282

SVC2 — Wed, 03 Feb 2010 00:39:13 GMT

I avoided using PortA as output.

Re: Configuring PortE on 5282

dhar — Wed, 03 Feb 2010 01:46:47 GMT

can you give us an example code in C language that would make any ports light up...

Re: Configuring PortE on 5282

dhar — Wed, 03 Feb 2010 02:36:09 GMT

hi there!

what i mean is that an example that would give a +5V or 1 in a certain port that is connected to an LED...

Re: Configuring PortE on 5282

SVC2 — Wed, 03 Feb 2010 02:45:05 GMT

   /* Pin assignments for port EH
           Pin(s) 0,5-7, are GPIO inputs
           Pin(s) 1-4 are GPIO outputs
    */
    MCF5282_GPIO_DDREH = MCF5282_GPIO_DDRx4 |
                                      MCF5282_GPIO_DDRx3 |
                                      MCF5282_GPIO_DDRx2 |
                                      MCF5282_GPIO_DDRx1;
    MCF5282_GPIO_PEHLPAR = 0;

#define TURN_GREEN_LED_ON() (MCF5282_GPIO_SETEH = MCF5282_GPIO_SETx3)
#define TURN_GREEN_LED_OFF() (MCF5282_GPIO_CLREH = (uint8)(~MCF5282_GPIO_SETx3))

Re: Configuring PortE on 5282

dhar — Thu, 04 Feb 2010 15:32:41 GMT

btw, where can i find portEH?

how about using other ports? i mean how can i send an output of +5 volts in other ports so that it will light up the LED connected to the port other than portEH?

thanks for your help!

Re: Configuring PortE on 5282

mjbcswitzerland — Fri, 30 Apr 2010 05:15:54 GMT

For an analysis fo the port properties on the M5282 (and family) see the following document:

http://www.utasker.com/docs/Coldfire/uTaskerM5282.PDF

Regards

Mark