topic UART in M4 Core1 IMX8QM in i.MX Processors

UART in M4 Core1 IMX8QM

vinothkumars — Mon, 03 May 2021 18:33:45 GMT

Hi All,

I configured M40 UART in M4 MCU. But, there is no log from M4 UART

by default rear_view_camera application used core1 not core0

But, I configured SC_P_M40_I2C0_SDA as uart in Core1 as per the hardware

+ err = sc_pad_set_all(ipc, SC_P_M40_I2C0_SDA , 2U, SC_PAD_CONFIG_NORMAL, SC_PAD_ISO_OFF, 0x0 ,SC_PAD_WAKEUP_OFF);/* IOMUXD_M40_I2C0_SDA register modification value */
+ if (SC_ERR_NONE != err)
+ {
+ assert(false);
+ }

Will you please verify my configuration proper or not.

I need clarification -> M4 core0 UART will run or not in M4 core1.

BSP: L4.14.98 + Android 9 Automotive + MCU SDK

Re: UART in M4 Core1 IMX8QM

igorpadykov — Tue, 04 May 2021 00:32:12 GMT

Hi Vinothkumar

for that case except iomux settings one should consider proper resource allocation as described on

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/System-Controller-Firmware-101-Resource-management-service/ta-p/1123227

Best regards
igor

Re: UART in M4 Core1 IMX8QM

vinothkumars — Tue, 04 May 2021 01:54:01 GMT

Thank you @igorpadykov for the quick reply.

But, Unable to find how to use the core0 resource to core1. Will you please give some more details.

Re: UART in M4 Core1 IMX8QM

igorpadykov — Tue, 04 May 2021 05:26:53 GMT

please look at sect."Modifying default configuration" suggested link.

Best regards
igor

Re: UART in M4 Core1 IMX8QM

vinothkumars — Tue, 04 May 2021 05:39:54 GMT

Thank you @igorpadykov

Yes I checked it. But, I have to use the Cortex-M4 Core0 uart resource to Cortex-M4 Core1 for debug console.

These things I unable to find out

Re: UART in M4 Core1 IMX8QM

igorpadykov — Tue, 04 May 2021 10:42:56 GMT

>I have to use the Cortex-M4 Core0 uart resource to Cortex-M4 Core1 for debug console.

may be suggested to assign Core0 uart resource to Core1 partition, use flexcan example from suggested link.

Best regards
igor

Re: UART in M4 Core1 IMX8QM

vinothkumars — Tue, 04 May 2021 13:52:19 GMT

Thank you @igorpadykov for the reply,

/* set as movable */

sc_rm_set_resource_movable(ipc, SC_P_M40_I2C0_SDA, SC_P_M40_I2C0_SDA, SC_TRUE);

SCFW to M4_1

Partition 0 --> SCFW (M40_I2C0_SDA)

Partition 4 --> M4_1

Is it the right way ?

Re: UART in M4 Core1 IMX8QM

vinothkumars — Sat, 15 May 2021 08:06:32 GMT

Hi @igorpadykov ,

Still I unable to achieve this,

SC_P_M40_I2C0_SDA for MIMX8QM_CM4_CORE1

I tried almost all API but there is no luck,

ipc = SystemGetScfwIpcHandle();

sc_rm_get_partition(ipc,&pt_m4);

sc_rm_set_pad_movable(ipc, SC_P_M40_I2C0_SCL, SC_P_M40_I2C0_SDA, SC_TRUE);
sc_rm_assign_pad(ipc, pt_m4, SC_P_M40_I2C0_SDA);

#if defined(MIMX8QM_CM4_CORE0)

#define BOARD_INITPINS_TX SC_P_M40_I2C0_SDA /*!< Pin function id */

#define BOARD_INITPINS_RX SC_P_M40_I2C0_SCL /*!< Pin function id */

#elif defined(MIMX8QM_CM4_CORE1)

#define BOARD_INITPINS_TX SC_P_M41_I2C0_SDA /*!< Pin function id */

#define BOARD_INITPINS_RX SC_P_M41_I2C0_SCL /*!< Pin function id */

#else

#error pin config not set

#endif