ELEKTOR FORUMS

Hi Landi,

I have been wanting to do this myself, so would appreciate you publishing exact details on how to do this.

many thanks

Hello,


Here is the method to programm AN0-7 as GPIO:
- Initialisation sequence
#define MASK_BITS 0x0F // AN0-3 as GPIO and AN4-7 as analog inputs (4 example...)
MCF_GPIO_PANPAR &= ~(MASK_BITS); // Port Assignment Register (0=GPIO, 1=Primary function)
MCF_GPIO_DDRAN = MASK_BITS; // Data Direction Register (0=input, 1=output)
- Set Reset Bits
MCF_GPIO_PORTAN = 1; // set bit0 and reset others (example...)

Now you can use to port AN MCF_GPIO_PORTAN as MCF_GPIO_PORTTA for GPT0-3.

You can find what you want in doc Freescale:"MCF52235RM"
(MCF52235 ColdFire Integrated Microcontroller Reference Manual)


Greetings, Henri

Hello Henri and others.

I understand the concept you've explained, but I have trouble fiding the correct place for the statements. So far I have done the following:

1. In the file freescale_http_server.h in the section "Mains Control" I have added #define MASK_BITS 0x00 (I did not add 0x0F as suggested, since I would want all ANx to be outputs).
In the section of the same file I have added
#define SSA0_ON MCF_GPIO_PORTTA = (uint8)(MCF_GPIO_PORTTA| MCF_GPIO_PORTAN_PORTAN1);
I have tried different combinations, since I do not know the syntax.

2. In the file freescale_static_fss_utils.c I have created function

void form_SSA0_function( char *data )
{
UINT32 *flag = &html_vars[15];
char *str;
if (str = strchr(data, '&')) *str = 0x0; /* clear & character */
if (!(strcmp(data,"LIGHT_ON"))){
MCF_GPIO_PANPAR &= ~(MASK_BITS);
MCF_GPIO_DDRAN = MASK_BITS;
SSA0_ON;
*flag = 1;
// disable interrupt on the RTC
//MCF_RTC_IER &= ~MCF_RTC_IER_ALM;
//MCF_INTC0_IMRH |= MCF_INTC_IMRH_MASK63;
return;
}
}

which is heavily based on existing code. The code compiles and I am able to flash the DigiButler.

In the browser I enter
http://192.168.0.152/index.htm?SSA0=LIGHT_ON

where I expect AN1 to change state. That does not happen, nor it does for any other ANx. I can see that there is som kind of reaction, since the page apparently is reloaded.

Any ideas of what's wrong?

Regards

Lande

Hello.

Thanks Henri for the code sample. It works just fine now. I am able to switch pin 4 og J7 (AN0) on and off just by entering http://192.168.0.152/index.htm?SSA0=LIGHT_ON or http://192.168.0.152/index.htm?SSA0=LIGHT_OFF in the browser. Now it should be easy to control the other outputs.

If anyone would like more details, I would be pleased to post, otherwise the correspondence might speak for itself.

Lande