topic imx6ul adc driver in i.MX Processors

imx6ul adc driver

小辉哥 — Thu, 28 Jan 2016 07:10:41 GMT

Dear all,

I want to put the GPIO1_IO09 pin configured to adc function，I have modified the imx6ul-14x14-evk.dts and imx6ul.dtsi .

The following: (Red font is I modified in the imx6ul-14x14-evk.dts)

reg_sd1_vmmc: regulator@1 {

compatible = "regulator-fixed";

regulator-name = "VSD_3V3";

regulator-min-microvolt = <3300000>;

regulator-max-microvolt = <3300000>;

//gpio = <&gpio1 9 GPIO_ACTIVE_HIGH>;

//enable-active-high;

};

reg_vref_3v3: regulator@2 {

compatible = "regulator-fixed";

regulator-name = "vref-3v3";

regulator-min-microvolt = <3300000>;

regulator-max-microvolt = <3300000>;

};

&adc1 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_adc1>;

vref-supply = <&reg_vref_3v3>;

status = "okay";

};

pinctrl_hog_1: hoggrp-1 {

fsl,pins = <

MX6UL_PAD_LCD_RESET__WDOG1_WDOG_ANY 0x30b0

MX6UL_PAD_UART1_RTS_B__GPIO1_IO19 0x17059 /* SD1 CD */

MX6UL_PAD_GPIO1_IO05__USDHC1_VSELECT 0x17059 /* SD1 VSELECT */

//MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 0x17059 /* SD1 RESET */

};

pinctrl_adc1: adc1grp {

fsl,pins = <

MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 0xb0

};

imx6ul.dtsi file i modified :

adc1: adc@02198000 {

compatible = "fsl,imx6ul-adc", "fsl,vf610-adc";

reg = <0x02198000 0x4000>;

interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;

clocks = <&clks IMX6UL_CLK_ADC1>;

num-channels = <10>;

clock-names = "adc";

status = "disabled";

When I send this pin is connected to the different voltage(3.3V or 2.5V), found the adc values will not change,

root@imx_mfgtools_nogpu:/sys/bus/iio/devices/iio:device0# cat in_voltage9_raw

4080

root@imx_mfgtools_nogpu:/sys/bus/iio/devices/iio:device0# cat in_voltage9_raw

4077

root@imx_mfgtools_nogpu:/sys/bus/iio/devices/iio:device0# cat in_voltage9_raw

Can you tell me how to modify to get the right result?

Best Regards,

xiaohuige

Re: imx6ul adc driver

igorpadykov — Thu, 28 Jan 2016 08:29:07 GMT

Hi 小辉哥

this signal is used in uboot also, please try to set it as input with pull disabled,

iomux_v3_cfg_t const usdhc1_pads[]

uboot-imx.git - Freescale i.MX u-boot Tree

Best regards

igor

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Re: imx6ul adc driver

小辉哥 — Fri, 29 Jan 2016 03:16:32 GMT

hi igor

Thanks for your answers ，I modified the code as you suggest，but Is still the same result，I find it is only 3.3 V, and 0 V will change ，other voltage is about 4056.

Re: imx6ul adc driver

小辉哥 — Fri, 29 Jan 2016 03:48:34 GMT

sorry， I missed one place, don't set it to input ，now it is ok。

Re: imx6ul adc driver

goiatzmaser — Thu, 05 May 2016 11:39:03 GMT

Good morning,

I am trying to do the same with my custom board, only with the diference that I will use 10 gpios.

Using your example, i configure GPIO6 not GPIO9 like this example and I am reading ok a temperature sensor.

pinctrl_adc1: adc1grp {

fsl,pins = <

MX6UL_PAD_GPIO1_IO06__GPIO1_IO06 0xb0

};

But, i need to configure other 9gpios, started form GPIO1_IO1 to GPIO1_IO9 all ADC. What I don´t know is how I must configure on the device tree, all this gpios. Maybe:

pinctrl_adc1: adc1grp {

fsl,pins = <

MX6UL_PAD_GPIO1_IO00__GPIO1_IO00 0xb0

MX6UL_PAD_GPIO1_IO01__GPIO1_IO01 0xb0

MX6UL_PAD_GPIO1_IO02__GPIO1_IO02 0xb0

MX6UL_PAD_GPIO1_IO03__GPIO1_IO03 0xb0

MX6UL_PAD_GPIO1_IO04__GPIO1_IO04 0xb0

MX6UL_PAD_GPIO1_IO05__GPIO1_IO05 0xb0

MX6UL_PAD_GPIO1_IO06__GPIO1_IO06 0xb0

MX6UL_PAD_GPIO1_IO07__GPIO1_IO07 0xb0

MX6UL_PAD_GPIO1_IO08__GPIO1_IO08 0xb0

MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 0xb0

};

I can´t find any information on internet. Can you help me please?

Thanks for all, best regards,

Goiatz

Re: imx6ul adc driver

小辉哥 — Fri, 06 May 2016 08:23:58 GMT

Hi，Goiatz

yes，You this set is right，Note that other drivers didn't use these pins both uboot and linux。

Re: imx6ul adc driver

krzysztoflukasz — Mon, 11 Jul 2016 12:53:31 GMT

Good morning,

I am trying as well to set up the ADC on iMX6UL on my custom board.

I would like to run ADC on the following pins:

GPIO1_IO02 to GPIO1_IO07.

GPIO1_IO00 to GPIO1_IO01 I want to use as I2C pins.

GPIO1_IO08 to GPIO1_IO09 I want to use as output pins.

I understand that I need to modify in imx6ul.dtsi as follow:

num-channels = <6>;

But how to apply the offset to not start from channel 0 but 2?

Best Regards,

Krzysztof

Re: imx6ul adc driver

宗標廖 — Fri, 16 Sep 2016 11:14:10 GMT

Hi Krzysztof

You can refer to https://community.nxp.com/message/832380?commentID=832380&et=watches.email.thread#comment-832380

ZongbiaoLiao

Re: imx6ul adc driver

krzysztoflukasz — Fri, 16 Sep 2016 11:21:02 GMT

Thanks! :smileyhappy:

So I will need as well to change something in the driver code.

Krzysztof

Re: imx6ul adc driver

玉栋郭 — Fri, 24 Mar 2017 03:37:17 GMT

hi 小辉哥，

我也遇到这个问题，但是我修改完之后，cat in_voltage9_raw 一直是4095，我要怎样从uboot中禁用 pull?