Hi,
I am trying to use GPIO 14 for controlling a LED.
The issue is that i cannot change the state of the GPIO.
This is the dummy-code i use to try to set the pin low:
unsigned short *reg_EBSR = (unsigned short*) 0x1C00;
unsigned short *reg_IODIR1 = (unsigned short*) 0x1C06;
unsigned short *reg_IODATAOUT1 = (unsigned short*) 0x1C08;
unsigned short *reg_PCGCR1 = (unsigned short*) 0x1C02;
unsigned short *reg_PCGCR2 = (unsigned short*) 0x1C03;
LOG_printf(&trace, "hello world!");
*reg_PCGCR1 = 0;
*reg_PCGCR2 = 0;
*reg_EBSR |= 0x6000;
*reg_EBSR &= 0xEFFF;
*reg_IODIR1 |= 0x4000;
*reg_IODATAOUT1 |= 0x4000;
I have hooked up an osciliscope so i can monitor the state of the GPIO but the state remains low whatever i do.
The datasheet (http://focus.ti.com/lit/ds/symlink/tms320c5505.pdf) mention that i must configure PPMODE in the EBSR-register.
But the documentation for the EBSR register does not mention GPIO 14. The PPMODE-configuration claims to controll mulitplexing for "GP[31:27, 20:18]".
I have tried the same code on the eZDSP-stick but without being able to change the state of GPIO 14.
Also, this line is very confusing: "After the boot process is complete, the external bus selection register must be modified only once, during device configuration. Continuously switching the EBSR configuration is not supported."
Does it mean that changes after boot are ignored?
Anyone had any luck with this GPIO?
Regards
Mats Soderhall
