TDA4VM: TDA4VM

Prashant Kumthekar

Part Number: TDA4VM
Other Parts Discussed in Thread: SYSCONFIG

Hello TI Team,

we are configuring main spi1 with the following configuration for SPI Master. We are getting our tx signal on the rx line.

In sysconfig tool pin's are mentioned as D0 and D1 instead of MOSI(tx) and MISO(rx), what is the meaning of D0 and D1.

As per below configuration we are seeing tx data on Y2 pin

&main_pmx0 {
myspi1_pins_default: myspi1_pins_default {
pinctrl-single,pins = <
J721E_IOPAD(0x1dc, PIN_OUTPUT, 0) /* (Y1) SPI1_CLK */
J721E_IOPAD(0x1e0, PIN_OUTPUT, 0) /* (Y5) SPI1_D0 */
J721E_IOPAD(0x1e4, PIN_INPUT, 0) /* (Y2) SPI1_D1 */
J721E_IOPAD(0x1d4, PIN_OUTPUT, 0) /* (Y3) SPI1_CS0 */
>;
};

};

over 2 years ago

0 KB over 2 years ago

TI__Guru** 120721 points

Hi Prashant,

The naming convention hi-lited for above entry, reflects that of the Datasheet pin definition, where D0 / D1 I/O pins, could be read as Data0 or Data1.

Driver can configure MISO/MOSI using MCSPI_CHCONF_x registers. TI SDK may only use one configuration, so be aware that changing pin settings / register settings may require driver updates.

Regards,

0 Prashant Kumthekar over 2 years ago in reply to KB

Prodigy 50 points

Hi,

Thanks for the quick response.

We are using Yocto and we are using SPIDEV driver. My understanding is if we are giving direction of the pin then driver needs to take care about the direction right?

Could you please guide us to instruct driver for pin direction?

0 Keerthy J over 2 years ago in reply to Prashant Kumthekar

TI__Guru**** 162770 points

Hi Prashant,

&main_pmx0 {
myspi1_pins_default: myspi1_pins_default {
pinctrl-single,pins = <
J721E_IOPAD(0x1dc, PIN_OUTPUT, 0) /* (Y1) SPI1_CLK */
J721E_IOPAD(0x1e0, PIN_OUTPUT, 0) /* (Y5) SPI1_D0 */
J721E_IOPAD(0x1e4, PIN_INPUT, 0) /* (Y2) SPI1_D1 */
J721E_IOPAD(0x1d4, PIN_OUTPUT, 0) /* (Y3) SPI1_CS0 */
>;
};

Configure all the Pins as input. At a pinmux level configure all of them as INPUT.

Follow the FAQ: https://e2e.ti.com/support/processors/f/791/t/947437

Best Regards,
Keerthy

0 Prashant Kumthekar over 2 years ago in reply to Keerthy J

Prodigy 50 points

what is the reason behind this, could you please elaborate?

0 Keerthy J over 2 years ago in reply to Prashant Kumthekar

TI__Guru**** 162770 points

Hi Prashant,

CS and Data out lines can still disable INPUT. CLK Line must be input.

At a pad level PIN_INPUT gives bi-directional capabilities. So it is simpler to configure & avoid any confusion with D0/D1 line swaps etc.
So PIN_INPUT should suffice. Closing this thread.

- Keerthy

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TDA4VM: TDA4VM