Howto toggle a GPIO on EVM816x

Hi,

do you use the Spectrum Digital EVM. If yes, this link could help you

http://support.spectrumdigital.com/boards/evm816x/reve/

or

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/130602.aspx

Regards

Roman

This thread leads to some further hints:

• PSP User Guide
• GPIO Driver User Guide

Maybe it helps,
regards,

Joern.

HI

Yes it is the EVM from digital, and I have already tried with the BLS that they supply. 

It seems to me that the evm816x_gpio.h is not for the C6A8168 processor, since the GPIO controller base is defined to 

#define GPIO_BASE               ( 0x01c67000 )

but for the C6A8168 GPIO0 is at address 0x4803200

I have tried with a main function like this

EVM816X_GPIO_init         ( );
EVM816X_GPIO_setDirection (GPIO27,  GPIO_OUT);
EVM816X_GPIO_setOutput    (GPIO27,  1);

but it crashes when executing the first init function.

Jens

FYI

I have made some progress on making a GPIO toggle.

- I have modified the evm816x_gpio.h from Digital Spectrum, so it matches the C6A8168 (base address and register structure).

- I have updated the GEL file evm816x.gel to setup the pin that I want to toggle
   #define conf_gp0_io6 (CTRL_MODULE_BASE_ADDR + 0x0CA0)

Setup_PADCTRL( )
{
...

WR_MEM_32(conf_gp0_io6 , 2); // GPMC A23
...
} 

- Then I have made a program that runs on the ARM that toggels GP0[26] 

#include <stdio.h>
#include "evm816x.h"
#include "evm816x_gpio.h"

void main(void) 
{
 long int i, j;
 EVM816X_GPIO_setDirection(GPIO26, GPIO_OUT);
 while (1)
 {
 EVM816X_GPIO_setOutput(GPIO26, j);
 j ^= 1;
 }
}

This is obviously great, but it does not solve my problem, since I need to access the GPIO from the DSP.

I have read in the Reference manual that the GPIO is connected to the L4 interconnect, which the DSP can access through a System MMU, but I have absolutely no idea about how to do this.

So I would greatly appreciate it if somebody could point me in the right direction

Thanks

Jens Biltoft