i.MX8QXP scfw: Issue on cpu's internal PULL pad SC_P_USDHC1_RESET_B, set pull disabled

[tommaso_merciai]

Hi all,

We are working on scfw 1.2.7.1 for i.MX8QXP rev B0. We need to read the value of GPIO4 19  pad SC_P_USDHC1_RESET_B  mux 4. To do that we use the following way:

/* GPIO configuration */

igpio_pin_config_t config_i;

config_i.direction = kIGPIO_DigitalInput;

/* Power up and mux pad as GPIO */

pm_force_resource_power_mode(SC_R_GPIO_4, SC_PM_PW_MODE_ON);

pad_force_mux(SC_P_USDHC1_RESET_B, 4, SC_PAD_CONFIG_OD_IN, SC_PAD_ISO_OFF);

/* Init GPIO */

IGPIO_PinInit(GPIO4, 19U, &config_i);

/* and read GPIO*/

val = IGPIO_PinRead(GPIO4, 19U);

debug_print(1, "\nVALUE --> 0x%x\n", val);

GPIO value is correctly read but we are not able to set PULL configuration,  pag 733 of Reference Manual.

6-5 Pull Down Pull Up

PULL

Pull Down Pull Up

00b - Prohibited

01b - pull up

10b - pull down

11b - pull disabled

We want set pull disabled mode from scfw sources. To do that we try to use the following functions, with negative result:

sc_pad_set_gp_28fdsoi(SC_PT, SC_P_USDHC1_RESET_B, SC_PAD_28FDSOI_DSE_DV_LOW, SC_PAD_28FDSOI_PS_NONE);

sc_pad_set_gp(SC_PT, SC_P_USDHC1_RESET_B, 0x24000077);

sc_pad_set(SC_PT, SC_P_USDHC1_RESET_B, 0x24000077);

After these functions have been used, we always see active the interna cpu pull-up .

Thanks in advance.

Tommaso

[tommaso_merciai]

Hi Aldo,

Thanks for your answer. In the previous thread I describe that we have just try this way without success.

"We want set pull disabled mode from scfw sources. To do that we try to use the following functions, with negative result:
 
sc_pad_set_gp_28fdsoi(SC_PT, SC_P_USDHC1_RESET_B, SC_PAD_28FDSOI_DSE_DV_LOW, SC_PAD_28FDSOI_PS_NONE);
sc_pad_set_gp(SC_PT, SC_P_USDHC1_RESET_B, 0x24000077);
sc_pad_set(SC_PT, SC_P_USDHC1_RESET_B, 0x24000077);
 
After these functions have been used, we always see active the interna cpu pull-up ."
https://community.nxp.com/t5/i-MX-Processors/i-MX8QXP-scfw-Issue-on-cpu-s-internal-PULL-pad-SC-P-USD....

Other ideas?

Thanks again.

Tommaso

[AldoG]

Hello,

Sorry I missed that part, please try without using the sc_ in the function:

pad_set_gp_28fdsoi(SC_PT, SC_P_USDHC1_RESET_B, SC_PAD_28FDSOI_DSE_DV_LOW, SC_PAD_28FDSOI_PS_NONE);

Also, if this does not work please check the return value of this function and share it.

BR,
Aldo.

[AldoG]

Hello,

For configuration like the pull select, please try with the following function:
sc_pad_set_gp_28fdsoi(ipc, SC_P_USDHC1_RESET_B, SC_PAD_28FDSOI_DSE_DV_LOW, SC_PAD_28FDSOI_PS_NONE);

Thanks,
Aldo.