LP-AM243: How to use ADC0_AIN as Digital Input

Tomoya Oyama

Intellectual 330 points

Part Number: LP-AM243
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi team,

I develop sdk of AM243x-LP,

I tried to use ADC0_AIN0(GPIO1_80) ~ ADC0_AIN7(GPIO1_87) as Digital Input.

In spite of other GPIO are worked, ADC0_AIN are not worked.

Please tell me what is different.

Best regard,

oyama

8 months ago

0 Meet Thakar 8 months ago

TI__Genius 13265 points

Hi Oyama-San,

Ideally this should work, could you please provide me more details on your test and how you are verifying that AIN0 is not working, I can try to test the same at my end to verify the same.

Best regards,

Meet.

0 Tomoya Oyama 8 months ago in reply to Meet Thakar

Intellectual 330 points

Hi Meet,

I use "gpio_input_interrupt", and change GPIO peripherals in the sysconfig,

and connect +3.3V and target pin by cable.

For example, changing to J3 pin, and plugging and unplugging a cable, it worked.

But, changing to ADC0_AIN0/H21 pin, it doesn't work.

Best regard,

oyama

0 Swargam Anil 8 months ago in reply to Tomoya Oyama

TI__Mastermind 48256 points

Hello oyama,

To configure ADC pins as GPI, then there is a procedure.

You can follow the link below, and please let us know still know if you face any issues.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1424673/am6442-where-are-adc0-related-ctrlmmr_padconfig-registers-specified-in-trm

Regards,

Anil.

0 Tomoya Oyama 8 months ago in reply to Swargam Anil

Intellectual 330 points

Hello Anil,

I tried to write GPI_MODE_EN after unlock write-protected Partition 1 registers.

I Confirmed the UNLOCKED bit set 1, but I can't write any value to CTRLMMR_ADC0_CTRL Register.

Do you know some reason of it?

    #define    CTRLMMR_LOCK1_KICK0  (0x04505008)
    #define    CTRLMMR_LOCK1_KICK1  (0x0450500C)
    #define    CTRLMMR_ADC0_CTRL    (0x43004710)
    #define    GPI_MODE_EN_BITMASK  (0x0001000)

    uint32_t   ctrlmmr_ADC0_ctrl_value = 0;
    uint32_t   KICK_KYE0 = 0x68EF3490;
    uint32_t   KICK_KYE1 = 0xD172BC5A;

    memcpy((void *)CTRLMMR_LOCK1_KICK0,(void *)&KICK_KYE0,4);
    memcpy((void *)CTRLMMR_LOCK1_KICK1,(void *)&KICK_KYE1,4);

    memcpy((void *)&ctrlmmr_ADC0_ctrl_value,(void *)CTRLMMR_ADC0_CTRL,4);
    ctrlmmr_ADC0_ctrl_value=ctrlmmr_ADC0_ctrl_value+GPI_MODE_EN_BITMASK;
    memcpy((void *)CTRLMMR_ADC0_CTRL,(void *)&ctrlmmr_ADC0_ctrl_value,4);

Best regard,

oyama

0 Meet Thakar 8 months ago in reply to Tomoya Oyama

TI__Genius 13265 points

Hi Oyama-San,

I am assigning this thread to the domain expert, please wait for their reply.

Best Regards,

Meet.

+1 Swargam Anil 8 months ago in reply to Meet Thakar

TI__Mastermind 48256 points

Hi Oyama-San,

Please use the code below and try it.

For me, it works fine, and I am able to make it high in the 16 bit position.

    /* set timer clock source */
    SOC_controlModuleUnlockMMR(SOC_DOMAIN_ID_MAIN, 1);
    *(volatile uint32_t*)(0x43004710) = (1U<<16U);
    SOC_controlModuleLockMMR(SOC_DOMAIN_ID_MAIN, 1);

Regards,

Anil.

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LP-AM243: How to use ADC0_AIN as Digital Input