| Author |
Message |
|
|
 Posted: Mar 08, 2012 - 05:22 PM |
|
Joined: Jun 16, 2011
Posts: 5
|
|
Hi,
I'm trying to communicate with an LCD screen using GPIOs. Since the LCD I own had data bus working on 5V, I use GPIO PB01-02-10-19-20-23-27-28 because they are 5V tolerant. For the control (WR, RD, etc), I use GPIO PA00-04-08-12-16-20.
The board I use is the EVK1100 powered by USB (and of course no EXT power). The problem is the following: When I set the power switch to EXT, it seems the board still continue to operate. The PWR led is still on.
About my code, to deal with GPIOs, I don't use anything else then:
gpio_enable_gpio_pin();
gpio_clr_gpio_pin();
gpio_set_gpio_pin();
Is it possible that the EVK1100 get power from GPIO to operate, if yes, is there a way to avoid it ?
Regards
Thomls |
|
|
| |
|
|
|
|
|
|
Posted: Mar 14, 2012 - 05:08 PM |
|
Joined: Jun 16, 2011
Posts: 5
|
|
| Had to disable pull-up resistances... |
|
|
| |
|
|
|
|
|
|
|
FAQ
Search
Register
Log in to check your private messages
Log in
Maximize
RSS
