PROCESSOR-SDK-AM62X: i2c test on EVM

Part Number: PROCESSOR-SDK-AM62X

Hi,

I would like to test the i2c read and write using EEPROM on AM62x-EVM.

But I was not able write using the following.

Here is the code that i am trying.

/*
 * Copyright 2006-2009 Freescale Semiconductor, Inc. All rights reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include "mxc_test.h"

int main(int argc, char **argv)
{
        i2c_test i2c_test;
        int i2c_file;
        char reg[1];
        char buf[2];
        int fail = 0;

        printf("\nTest: I2C Test With EEPROM!\n");

        i2c_file = open("/dev/i2c-0", O_RDWR);
        if (i2c_file < 0) {
                printf("Open failed\n");
                exit(-1);
        }

        /* Enable the CSI clock */
        ioctl(i2c_file, 3, &i2c_test);

        i2c_test.bus = 0;
        i2c_test.slave_addr = 0x51;

        printf("Slave address=0x%x\n\n", i2c_test.slave_addr);

        reg[0] = 0x00;
        buf[1] = 0x4;
        buf[0] = 0x0;
        i2c_test.reg = reg;
        i2c_test.reg_size = 1;
        i2c_test.buf = buf;
        i2c_test.buf_size = 2;

        printf("Data write: buf[0]=%x, buf[1]=%x to reg=%x\n", buf[0], buf[1], reg[0]);
        ioctl(i2c_file, 2, &i2c_test);

        buf[0] = 0;
        buf[1] = 0;
        i2c_test.buf = buf;
        ioctl(i2c_file, 1, &i2c_test);

        if (i2c_test.buf[0] != 0x0) {
                fail = 1;
        }

        if ((i2c_test.buf[1] & 0x4)!= 0x4) {
                fail = 1;
        }
        printf("Data read: buf[0]=%x, buf[1]=%x from reg=%x\n", buf[0], buf[1], reg[0]);

        if (fail == 1) {
                printf("\nI2C TEST FAILED\n\n");
        } else {
                printf("\nI2C TEST PASSED\n\n");
        }

        /* Disable the CSI clock */
        ioctl(i2c_file, 4, &i2c_test);

        close(i2c_file);

        return 0;
}

But as you can see here, it is not working.

Test: I2C Test With EEPROM!
Slave address=0x51

Data write: buf[0]=0, buf[1]=4 to reg=0
Data read: buf[0]=0, buf[1]=0 from reg=0

I2C TEST FAILED

And this is the dts file. I configured the pin 21 and 24 of J9(MCU header pins) and pin 27 and 28 of J3(IO expansion pins).

Bus number is 0 and address is 0x51.

10a11
> 		serial5 = &main_uart5;
23c24
< 		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
---
> 		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02850000";
231a233,246
> 	led1 {
> 		compatible = "gpio-leds";
> 		pinctrl-names = "default";
> 		pinctrl-0 = <&usr_led_pins_test>;
> 
> 		led-0 {
> 			label = "test";
> 			gpios = <&main_gpio0 42 GPIO_ACTIVE_HIGH>;
> 			linux,default-trigger = "heartbeat";
> 			function = LED_FUNCTION_HEARTBEAT;
> 			default-state = "on";
> 		};
> 	};
> 
257a273,280
> 	main_uart5_pins_default: main-uart5-pins-default {
> 		pinctrl-single,pins = <
> 			AM62X_IOPAD(0x1d8, PIN_INPUT, 1) /* (C15) MCAN0_TX.UART5_RXD */
> 			AM62X_IOPAD(0x1dc, PIN_OUTPUT, 1) /* (E15) MCAN0_RX.UART5_TXD */
> 		>;
> 	};
> 
> // this is connected to EEPROM
335a359,364
> 	usr_led_pins_test: usr-led-pins-test {
> 		pinctrl-single,pins = <
> 			AM62X_IOPAD(0x00ac, PIN_OUTPUT, 7) /* (L21) GPMC0_CSn1.GPIO0_42 */
> 		>;
> 	};
> 
453a483,491
> &mcu_pmx0 {
> 	mymcui2c1_pins_default: mymcui2c1-pins-default {
> 		pinctrl-single,pins = <
> 			AM62X_MCU_IOPAD(0x0044, PIN_INPUT, 0) /* (A8) MCU_I2C0_SCL */
> 			AM62X_MCU_IOPAD(0x0048, PIN_INPUT, 0) /* (D10) MCU_I2C0_SDA */
> 		>;
> 	};
> };
> 
486c524,525
< 	status = "disabled";
---
> 	pinctrl-names = "default";
> 	pinctrl-0 = <&main_uart5_pins_default>;

And this is from dtsi file. (no changes was made to this)

&main_i2c0 {
	pinctrl-names = "default";
	pinctrl-0 = <&main_i2c0_pins_default>;
	clock-frequency = <400000>;

	typec_pd: usb-pd@3f {
		compatible = "ti,tps6598x";
		reg = <0x3f>;

		connector {
			ports {
				#address-cells = <1>;
				#size-cells = <0>;

				port@1 {
					reg = <1>;

					usb_con_hs: endpoint {
						remote-endpoint = <&typec_hs>;
					};
				};
			};
		};
	};
};


// this is connected to EEPROM
	main_i2c0_pins_default: main-i2c0-pins-default {
		pinctrl-single,pins = <
			AM62X_IOPAD(0x1e0, PIN_INPUT_PULLUP, 0) /* (B16) I2C0_SCL */
			AM62X_IOPAD(0x1e4, PIN_INPUT_PULLUP, 0) /* (A16) I2C0_SDA */
		>;
	};