SK-AM62A-LP: Wakeup from Partial I/O via CANUART

Chris Wu

Part Number: SK-AM62A-LP
Other Parts Discussed in Thread: CCSTUDIO

Tool/software:

Hi,

The PMIC has been designed with reference to the following link. In the Linux system, command settings can be made to enter Partial I/O mode, and the PMIC GPIO can be triggered to wake up using hardware.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1391295/sk-am62b-p1-partial-io-lpm-support?tisearch=e2e-sitesearch&keymatch=partial%2520IO#

1. The CANUART wake-up part has not been successful. The MCU SDK version is mcu_plus_sdk_am62ax_09_02_00_38. How can I configure the pinmux in CCStudio to allow the MCU CAN or MCU UART to wake up?Is it possible not to set the MCU GPIO status in Linux?
2. Do you have any hardware suggestions? Where should PMIC_LPM_EN0 be connected?
3. The attached configuration is for the wakeup system; is the wake-up setting done here?
Thank you.

11 months ago

0 Anshu Madwesh 11 months ago

TI__Mastermind 18715 points

Hello,

Chris Wu said:
How can I configure the pinmux in CCStudio to allow the MCU CAN or MCU UART to wake up

Only the Linux SDK support low power modes so the pinmuxing needs to be done in the Linux device tree.

Chris Wu said:
Is it possible not to set the MCU GPIO status in Linux?

If you don't want to use the MCU GPIO in Linux, then you can set the device tree node to reserved like shown here: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi?h=ti-linux-6.1.y#n580

Chris Wu said:
3. The attached configuration is for the wakeup system; is the wake-up setting done here?

See here for an example of wake up sources in the device tree: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62x-sk-lpm-wkup-sources.dtso?h=ti-linux-6.1.y

I will re-assign to the hardware team for item 2.

Best Regards,

Anshu

0 Kallikuppa Sreenivasa 11 months ago in reply to Anshu Madwesh

TI__Guru**** 195269 points

Hello Chris Wu,

Is this a custom board or are you testing on the SK ?

Regards,

Sreenivasa

0 Chris Wu 11 months ago in reply to Anshu Madwesh

Prodigy 30 points

Hi,

I have written the wake-up settings in the MCU R5 PINMUX. Currently, in Partial I/O mode, sending data to wake up causes the CAN RX voltage to low.

PMIC_LPM_EN0 still cannot be controlled. How can I wake up through PMIC_LPM_EN0 after entering Partial I/O mode? According to the documentation, PMIC_LPM_EN0 belongs to the wake-up domain. Can this be configured in the DM R5? Below is my example.syscfg configuration in DM R5, which I used to generate the DMR5 tispl.bin image.

thanks.

/* MCU_UART0_RXD -> MCU_UART0_RXD (D8) */
{
    PIN_MCU_UART0_RXD,
    ( PIN_MODE(0) | PIN_INPUT_ENABLE | PIN_PULL_DIRECTION | PIN_WAKEUP_ENABLE)
},
/* MCU_MCAN1_RX -> MCU_MCAN1_RX (B9) */
{
    PIN_MCU_MCAN1_RX,
    ( PIN_MODE(0) | PIN_INPUT_ENABLE | PIN_PULL_DISABLE | PIN_WAKEUP_ENABLE)
},
        /* MCU_MCAN0 pin config */
/* MCU_MCAN0_RX -> MCU_MCAN0_RX (E8) */
{
    PIN_MCU_MCAN0_RX,
    ( PIN_MODE(0) | PIN_INPUT_ENABLE | PIN_PULL_DISABLE | PIN_WAKEUP_ENABLE)
},

Pinmux_config(gPinMuxMcuDomainCfg, PINMUX_DOMAIN_ID_MCU);

/**
 * These are the reserved peripherals and settings in this configuration
 */
const iWKUP_SYSTEM1                = scripting.addPeripheral("WKUP_SYSTEM");
iWKUP_SYSTEM1.$name                = "MyWKUP_SYSTEM1";
iWKUP_SYSTEM1.$assign              = "WKUP_SYSTEM0";
iWKUP_SYSTEM1.WKUP_CLKOUT0.$assign = "WKUP_CLKOUT0";
iWKUP_SYSTEM1.PMIC_LPM_EN0.$assign = "PMIC_LPM_EN0";