iMX7 M4 8bit data using GPIO_WRITEPORTOUTPUT();

Technical Support
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1

Dear Community,
I want to send 8 bit data, from 8 PIN at once (single time) using GPIO_WritePortOutput(); function through M4.
To avoid conflict with A7, need to disable 8 gpio pins through (Linux) device tree.

3

hi @narayanamohan

So what is your question?
Which pins do you want to use?

Best regards, Jaski

4

Dear Jaski,
I want to GPIO pins in X16 Connection Header (13 to 20) on Iris Board which are SODIMM pins no. (98,133,103,101,97,85,70,45) respectively. as OUTPUT using GPIO_WRITEPORTOUTPUT(); function from M4 send 8Bit DATA at once.

5

Thanks for this Information. You just need to disable these pins in the device tree files, so you can use them with m4 core.

6

Dear Jaski,

1196-whatsapp-image-2018-09-18-at-13032-pm.jpeg
1196-whatsapp-image-2018-09-18-at-13032-pm.jpeg768×1280 49.4 KB

I tried to do this in device tree IOMUXC. I tried to other SODIMM Pins to pinctrl_hog_1.

&iomuxc {
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_hog_1 &pinctrl_hog_2 &pinctrl_hog_3
&pinctrl_hog_4 &pinctrl_hog_5 &pinctrl_hog_6
&pinctrl_hog_7>;

imx7d-colibri {
	pinctrl_hog_1: hoggrp-1 {
		fsl,pins = <

		MX7D_PAD_SD2_RESET_B__GPIO5_IO11	0x14 /* SODIMM 98 */
			MX7D_PAD_ECSPI1_SCLK__GPIO4_IO16	0x14 /* SODIMM 101 */
			MX7D_PAD_ECSPI1_MOSI__GPIO4_IO17	0x14 /* SODIMM 103 */
		>;
	};

	pinctrl_hog_2: hoggrp-2 { /* Camera */
		fsl,pins = <
			MX7D_PAD_SD1_CD_B__GPIO5_IO0		0x74 /* SODIMM 69 */
			MX7D_PAD_I2C4_SDA__GPIO4_IO15		0x14 /* SODIMM 75 */
			MX7D_PAD_ECSPI1_MISO__GPIO4_IO18	0x14 /* SODIMM 79 */
			MX7D_PAD_I2C3_SCL__GPIO4_IO12		0x14 /* SODIMM 81 */
			MX7D_PAD_ECSPI2_MISO__GPIO4_IO22	0x14 /* SODIMM 85 */
			MX7D_PAD_ECSPI1_SS0__GPIO4_IO19		0x14 /* SODIMM 97 */
		//	MX7D_PAD_ECSPI1_SCLK__GPIO4_IO16	0x14 /* SODIMM 101 */
		//	MX7D_PAD_ECSPI1_MOSI__GPIO4_IO17	0x14 /* SODIMM 103 */
			MX7D_PAD_I2C3_SDA__GPIO4_IO13		0x14 /* SODIMM 94 */
			MX7D_PAD_I2C4_SCL__GPIO4_IO14		0x14 /* SODIMM 96 */
		//	MX7D_PAD_SD2_RESET_B__GPIO5_IO11	0x14 /* SODIMM 98 */
		>;

Kindly find the image attached. I want to send data to all LED at ONCE. I am able to glow 1 LED.

7

Thanks for the image and the device tree files. Could you send also the code you are using to switch on/off the GPIOs? Thanks.

8

Dear Jaski,

Q1) Error in Eclipse IDE. IMAGE ATTACHED.

1201-screenshot-from-2018-09-19-11-23-14.png
1201-screenshot-from-2018-09-19-11-23-14.png1366×768 198 KB

While Using SODIMM PIN 45 as GPIO in Iris X16 Connector Pin 20.

Q2 ) Unable to get output at
SODIMM PIN 79 as GPIO in Iris X16 Connector Pin 19.
ALSO checked from GPIO TOOL and used GPIO ECHO command.

Kindly help.

10

Thanks @jaski.tx and @stefan.tx
The Pin configuration
IOMUXC_LPSR_SW_MUX_CTL_PAD_GPIO1_IO01 did the job.

Also thanks for IMX7DRM.pdf

Thanks for the help.

11

You are welcome.

12

Hi @narayanamohan

As the error states the name IOMUX_SW_MUX_CTL_PAD_GPIO1_IO1 does not exist. You find the possible names in the file platform/devices/MCIMX7D/include/MCIMX7D_M4.h. I think you want to use IOMUXC_LPSR_SW_MUX_CTL_PAD_GPIO1_IO01 instead?
Also please check IMX7DRM.pdf on page 1589.

Regards,
Stefan