i.MX ProcessorsのトピックRe: Using GPIO's on IMX6 SLEVK

Using GPIO's on IMX6 SLEVK

praveendosapati — Thu, 25 Sep 2014 14:16:18 GMT

Hi,

I need two GPIO's on IMX6 SLEVK board. I have Identified one GPIO (LCD_DAT0) (GPIO_2_20). But When I am trying to toggle this GPIO I didn't observe any change in the output on Analyser. I have written the following code for toggling GPIO. Could some help me in toggling GPIO.

#define MX6_PAD_EIM_ADDR18_GPIO_2_20	IOMUX_PAD(0x04B8, 0x01B0,5, 0x0000, 0, NO_PAD_CTRL)

#define MX6SL_PAD_I2C1_SCL_GPIO_3_12

IOMUX_PAD(0x044C, 0x015C,5, 0x0000, 0, NO_PAD_CTRL)

#define GPIO2_20 (unsigned int)((1*32)+20)

#define GPIO3_12 (unsigned int)((2*32)+12)

int setup_imx_gpio(void);

int setup_imx_gpio()

{

// uint32 pad_gpio;

iomux_v3_cfg_t pad_gpio;

signed int res = 1;

// gpio code for I2C1_SCL U1 IC AC13

gpio_free(GPIO3_12);

res = gpio_request(GPIO3_12, "GPIO3_12");

if (res)

{

printk("Failed in Setup the GPIO3_12, error=%d\n", res);

return res;

}

pad_gpio = (iomux_v3_cfg_t) MX6SL_PAD_I2C1_SCL_GPIO_3_12;

mxc_iomux_v3_setup_pad(pad_gpio);

res = gpio_direction_output(GPIO3_12, 0);

// res = gpio_direction_input(GPIO3_12);

if (res)

{

printk("Failed in Setup Direction for the GPIO3_12, error=%d\n", res);

return res;

}

// gpio code for LCD_DAT0 J13-62

gpio_free(GPIO2_20);

res = gpio_request(GPIO2_20, "GPIO2_20");

if (res)

{

printk("Failed in Setup the GPIO2_20, error=%d\n", res);

return res;

}

pad_gpio = (iomux_v3_cfg_t) MX6_PAD_EIM_ADDR18_GPIO_2_20;

mxc_iomux_v3_setup_pad(pad_gpio);

// res = gpio_direction_input(GPIO2_20);

res = gpio_direction_output(GPIO2_20, 1); /* I need to Make this GPIO High by default*/

if (res)

{

printk("Failed in Setup Direction for the GPIO2_20, error=%d\n", res);

return res;

}

return 0;

}

#endif

Re: Using GPIO's on IMX6 SLEVK

CarlosCasillas — Fri, 03 Oct 2014 22:36:59 GMT

Hi,

Could you please specify which BSP are you using?

Have you checked/compared your configurations with the provided on the i.MX6 IOMUX_TOOL? It could be downloaded from here.

Additionally, you could check the solutions provided on the following threads:

Re: I.MX6 Multiplexer GPIO

Re: imx.6 GPIO

Hope this will be useful for you.
Best regards!
/Carlos

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Re: Using GPIO's on IMX6 SLEVK

fabio_estevam — Sat, 04 Oct 2014 11:24:25 GMT

I found one issue that prevented GPIO usage on mx6slevk board and I fixed it with this commit:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/arm/boot/dts/imx6sl-evk.dts?id=d2c3936ebe88c…