Thanks for the reply. So I take it I need to edit the mux.c file in the
PCM049(which is the one I use) board directory. I changed the lines as
below:
{I2C4_SDA, (PTU | IEN | M0)}, /* i2c4_sda */
{MCSPI1_CLK, (M3)}, /* gpio134 */
{MCSPI1_SOMI, (M3)}, /* gpio135 */
{MCSPI1_SIMO, (M3)}, /* gpio136 */
{MCSPI1_CS0, (M3)}, /* gpio137 */
{MCSPI1_CS1, (M3)}, /* gpio138 */
{MCSPI1_CS2, (M3)}, /* gpio139 */
{MCSPI1_CS3, (M3)}, /* gpio140 */
{UART3_CTS_RCTX, (PTU | IEN | M0)}, /* uart3_tx */
This still did not allow me to change pin conditions. So in the board.c
file for the PCM049, I also added these lines to force the config of the
pins:
omap_add_display(&pcm049_fb_data);
gpio_direction_output(135, 1);
gpio_direction_output(136, 1);
gpio_direction_output(137, 1);
gpio_direction_output(138, 1);
gpio_direction_output(139, 1);
gpio_direction_output(140, 1);
If I then do the gpiolib command inbarebox, the pins are indicated as gpio
as below:
gpio 133: false
gpio 134: false
gpio 135: true gpio
gpio 136: true gpio
gpio 137: true gpio
gpio 138: true gpio
gpio 139: true gpio
gpio 140: true gpio
gpio 141: false
gpio 142: false
gpio 143: false
BUT using the commands:
gpio_direction_output 135 0
And
gpio_direction_output 135 1
Still does not change the pin condition.
Is there something else I still need to do?
Thanks
Ivor
On 2014/03/17, 2:09 PM, "Sascha Hauer" <s.hauer@xxxxxxxxxxxxxx> wrote:
>On Mon, Mar 17, 2014 at 10:47:06AM +0200, Ivor Kruger wrote:
>> Hi, sure this is a quick and easy question for the group?
>>
>> On the OMAP4430, using the command from within barebox prompt to
>>configure
>> a GPIO for testing hardware:
>>
>> gpio_direction_output 140 0
>>
>> Should this be sufficient to set the gpio pin low, or is it required to
>> still do some pin muxing as well?
>
>The gpio functions only configure the gpio controller. If this pin is
>not gpio by default, you have to configure the pinmux controller aswell.
>There is no way to do that on the barebox commandline other than direct
>register
>writes to the pinmux controller.
>
>Sascha
>
>--
>Pengutronix e.K. | |
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