topic IMX6UL Sim1 not working in i.MX Processors

IMX6UL Sim1 not working

asmaa — Wed, 21 Aug 2019 09:56:56 GMT

Hello All,

My company is planning to implement cardreader using SIM1 PORT1 of IMX6ul interfacing to TDA8035.

When I ran mxc_sim_test.out to test sim functionality, It is giving me following output.

atr[0]= 0x0
Receiving timeout
Error when tx/rx:-1

do you all have any idea,What can be wrong?

For more information, here is our implementation.

Pin configuration as shown in schematic here.

IMX6UL pin settings

I have couple of questions, Have I implemented device tree shown below correctly, according to schematic?

----------------------------------------------------------------------------------------------------------------------

pinctrl_sim1: sim1grp{
fsl,pins = <
MX6UL_PAD_CSI_DATA01__SIM1_PORT1_SVEN 0x0010    /* SVEN */
MX6UL_PAD_CSI_VSYNC__SIM1_PORT1_CLK 0x0031        /* CLK */
MX6UL_PAD_CSI_DATA00__SIM1_PORT1_RST_B 0x0010 /* RST_B*/
MX6UL_PAD_CSI_DATA02__SIM1_PORT1_TRXD 0xb809     /* IO */
MX6UL_PAD_CSI_HSYNC__SIM1_PORT1_PD 0x1B000       /* PD */
/*MX6UL_PAD_SD1_CMD__GPIO2_IO16 0x1B0B0*/       /* 5V3V */
>;
};

&sim1 {
pinctrl-names ="default";
pinctrl-0 = <&pinctrl_sim1>;
clocks = <&clks IMX6UL_CLK_SIM1>;
clock-names = "sim";
assigned-clocks = <&clks IMX6UL_CLK_SIM_PODF>;
assigned-clock-rates = <240000000>;
/* GPIO_ACTIVE_HIGH/LOW:sim card voltage control
* NCN8025:Vcc = ACTIVE_HIGH?5V:3V
* TDA8035:Vcc = ACTIVE_HIGH?5V:1.8V
*/
pinctrl-assert-gpios = <&gpio2 16 GPIO_ACTIVE_HIGH>;
port = <1>;
sven_low_active;
status = "okay";
};

----------------------------------------------------------------------------------------------

As we want to select 5v, I have asserted gpio high as (pinctrl-assert-gpios = <&gpio2 16 GPIO_ACTIVE_HIGH>;) and EN_1.8V as high through IO Expander.

2. Is the above dts setting for asserting gpio2 16 pin is correct?

This is urgent, Could someone help please?

Yuri‌, igorpadykov‌, joanxie‌

Regards,

Asma

Re: IMX6UL Sim1 not working

igorpadykov — Wed, 21 Aug 2019 11:14:27 GMT

Hi Asma

one can look at sim example on nxp linux: linux/arch/arm/boot/dts/imx6ul-14x14-evk.dts

imx6ul-14x14-evk.dts\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Pay attention to differencies in pad settings in pinctrl_sim2: sim2grp,

port number in "port = ", "assigned-clocks ..".

For gpio2 16 look at similar settings for "gpio4 23 GPIO_ACTIVE_HIGH".

Best regards
igor
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Re: IMX6UL Sim1 not working

asmaa — Wed, 21 Aug 2019 11:24:01 GMT

igorpadykov‌

I have taken reference from their only... But mxc_sim_test is not giving expected output...

Can you please verify if everything I have done above is correct?

Re: IMX6UL Sim1 not working

igorpadykov — Wed, 21 Aug 2019 11:28:05 GMT

>Can you please verify if everything I have done above is correct?

there are big differencies in your pad settings in pinctrl_sim2: sim2grp,

port number in "port = ", "assigned-clocks ..".

with sim example in nxp linux: linux/arch/arm/boot/dts/imx6ul-14x14-evk.dts

imx6ul-14x14-evk.dts\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor

Re: IMX6UL Sim1 not working

asmaa — Wed, 21 Aug 2019 12:51:18 GMT

Yes because I am using different pins and PORT1 of SIM 1.

Is there any difference in functionality of port0 and PORT1?

Re: IMX6UL Sim1 not working

igorpadykov — Wed, 21 Aug 2019 13:07:29 GMT

>Yes because I am using different pins and PORT1 of SIM 1.

it does not matter, check for example pad settings :pinctrl_sim1: sim1grp,

the same for clocks

Re: IMX6UL Sim1 not working

asmaa — Thu, 22 Aug 2019 01:40:23 GMT

Hi igorpadykov‌,

I made the changes as sim2grp

&sim1 {
pinctrl-names ="default";
pinctrl-0 = <&pinctrl_sim1>;
clocks = <&clks IMX6UL_CLK_SIM1>;
clock-names = "sim";
assigned-clocks = <&clks IMX6UL_CLK_SIM_SEL>;
assigned-clock-parents = <&clks IMX6UL_CLK_SIM_PODF>;
assigned-clock-rates = <240000000>;
/* GPIO_ACTIVE_HIGH/LOW:sim card voltage control
* NCN8025:Vcc = ACTIVE_HIGH?5V:3V
* TDA8035:Vcc = ACTIVE_HIGH?5V:1.8V
*/
/*pinctrl-assert-gpios = <&gpio2 16 GPIO_ACTIVE_HIGH>;*/
port = <1>;
sven_low_active;
status = "okay";
};

pinctrl_sim1: sim1grp{
fsl,pins = <
MX6UL_PAD_CSI_DATA01__SIM1_PORT1_SVEN 0xb810 /* SVEN */
MX6UL_PAD_CSI_VSYNC__SIM1_PORT1_CLK 0x0011 /* CLK */
MX6UL_PAD_CSI_DATA00__SIM1_PORT1_RST_B 0xb810 /* RST_B*/
MX6UL_PAD_CSI_DATA02__SIM1_PORT1_TRXD 0xb811 /* IO */
MX6UL_PAD_CSI_HSYNC__SIM1_PORT1_PD 0xB808 /* PD */
MX6UL_PAD_SD1_CMD__GPIO2_IO16 0x3008 /* 5V3V */
>;
};

Scenario How I am testing:

Sim1 Port1 is connected to TDA8035:

First scenario

I am inserting Smart Card into into Card reader module and running mxc_sim_test.out. Ouput is:

No cardsim_cold_reset

NO card ...

Second scenario

I am not inserting Smart Card into into Card reader module and running mxc_sim_test.out. Ouput is:

Receiving timeout
Error when tx/rx:-1

Re: IMX6UL Sim1 not working

igorpadykov — Thu, 22 Aug 2019 01:48:27 GMT

Hi Asma

one can check with oscilloscope if there any sim signals.

Best regards
igor