TDA4VM: TDA4VH Main SPI controller issue

ford zhou

Part Number: TDA4VM
Other Parts Discussed in Thread: TDA4VH,

Hi Ti Experts

Chip ： TDAVH

SDK082

In our TDA4VH platform, we used 2x MCU SPI and 1x Main SPI to control external SPI devices. when we use Linux SPI command to debug SPI devices ,e.g spidev_test -D /dev/spidev2.0 -v -p "\x2c\x00\x00\xf3"

MCU domian SPI works fine. But there is a glitch on Main domain SPI CS signal before the correct CS signal start. The glitch duration is about 170ns and 247us before normal CS signal. We try both main domain SPI2 and SPI5 , the glitch on different CS pin is same. So we think the issue is not related to individual main SPI channel and CS. The CS glitch will disappear when we continue issue SPI command.But if we stop issue SPI command for a while ,then issue SPI command ,the glitch on CS signal will occur on the first SPI command again.

If we wired two SPI peripherals on a single SPI controller by different CS, e.g CS0,CS1. The glitch will occur on both CS0 and CS1 at the same time when issue SPI command, even the CS pin is not the active CS pin.

That means if we issue CS0 SPI command, the glitch will occur on both CS0 and CS1.

Please advise how to fix.

Thanks!

over 3 years ago

0 Brijesh Jadav over 3 years ago

TI__Guru**** 497805 points

Hi,

SPI module are essentially same on MCU domain and main domain, just the domain is different. So i don't think the issue is coming from the SPI module..

Is there anything on the board that could affect the CS signal?

Also are you sure that there is no data during this time?

What's the baud rate you are using for SPI transfer?

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

Hi Brijesh

Because CS signal only connect to one external chip CS input pin, should not affect TDA4VH CS signal.

The glitch is only on CS signal. when CS glitch occur, no SPI CLK and SPI data.

SPI CLK we used is 500Khz.

BTW, we also tried same SPI command on TDA4VM chip . TDA4VM main domain SPI has no this issue.

Regards!

Ford

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi,

Any change in the pinmux setting for the CS pin? Can you please share the value of the pinmux register?

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

0 ford zhou over 3 years ago in reply to ford zhou

Prodigy 10 points

Hi Brijesh

Which command can be used to get the pinmux register value through Uart console?

Thanks!

Ford

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi,

You could use k3dump or devmem2 utilities to get the Pinmux register dump..

Can you please compare the this register value for mcu spi and main domain spi?

I will in parallel check with the HW team.

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

Hi Brijesh

Please review MCU SPI0_CS0 Pinmux register dump and SPI5_CS0 ,CS1 Pinmux register dump.

Thanks!

Ford

0 ford zhou over 3 years ago in reply to ford zhou

Prodigy 10 points

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi ford,

I am checking with out HW team..

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

Hi Brijesh

May I know any update?

Thanks!

Ford

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi Ford,

According to HW team also, there shouldn't be any difference. In this case, can you please read SPI registers and share them? I wanted to check module control and channel config registers.

Regards,

Brijesh

0 ford zhou over 3 years ago

Prodigy 10 points

Hi Brijesh

which SPI registers address should I use? I used devmem2 0x2100000, but can't get correct value.

Thanks!

Ford

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi Ford,

Yes, this is correct address, is McSPI powered on? Because then accessing this register can cause crash.. This is HWREV register, so should be accessible as soon as module is powered on.

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

Hi Brijesh

SPIDEV_test -D command can run , so I think McSPI should power on.

And I tried other registers ,e.g , can read GPIO0 register but can't read I2C0_CFG , crashed also.

Could you tell me how to dump SPI config registers in detail?

Thanks!

Ford

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi Ford,

But i don't see any entry for SPI module in the dts file, Have you updated dts file with node for spi? Also how do you map spidev2.0 to spi0 instance?

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

hi Brijesh

we add our SPI node in dts as below:

please review.

Thanks!

Ford

0 Keerthy J over 3 years ago in reply to ford zhou

TI__Guru**** 169720 points

Hi Ford,

Take a look at this FAQ for J721e the same should apply for TDA4VH as well: https://e2e.ti.com/support/processors/f/791/t/947437

It is preferred to configure all the pins as PIN_INPUT like in the FAQ:

+	spi6_pins_default: spi6_pins_default {
+		pinctrl-single,pins = <
+			J721E_IOPAD(0x9c, PIN_INPUT, 4) /* (AC22) PRG1_PRU1_GPO17.SPI6_CLK */
+			J721E_IOPAD(0x74, PIN_INPUT, 4) /* (AC21) PRG1_PRU1_GPO7.SPI6_CS0 */
+			J721E_IOPAD(0x28, PIN_INPUT, 4) /* (AG20) PRG1_PRU0_GPO9.SPI6_CS1 */
+			J721E_IOPAD(0x2c, PIN_INPUT, 4) /* (AD21) PRG1_PRU0_GPO10.SPI6_CS2 */
+			J721E_IOPAD(0x7c, PIN_INPUT, 4) /* (AF21) PRG1_PRU1_GPO9.SPI6_CS3 */
+			J721E_IOPAD(0xa0, PIN_INPUT, 4) /* (AJ22) PRG1_PRU1_GPO18.SPI6_D0 */
+			J721E_IOPAD(0xa4, PIN_INPUT, 4) /* (AH22) PRG1_PRU1_GPO19.SPI6_D1 */
+		>;
+	};
+

PIN_INPUT gives bidirectional capabilities. Please try the above configuration & let us know.

Best Regards,
Keerthy

0 ford zhou over 3 years ago in reply to Keerthy J

Prodigy 10 points

Hi Keerthy

The glitch on CS signal issue is still on there....

Please find out another solution.

Thanks!

Ford

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi Ford,

Above changes will allow accessing SPI register and will not solve glitch issue. So please make changes and read registers for further debug.

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

Hi Brijesh

Can't read SPI CFG registers still.

Regards!

Ford

root@j784s4-evm:~# spidev_test -D /dev/spidev2.0 -v -p "\x2c\x00\x00\xf3"
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)
TX | 2C 00 00 F3 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |,...|
RX | 2D AA 55 99 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |-.U.|
root@j784s4-evm:~#
root@j784s4-evm:~# spidev_test -D /dev/spidev2.0 -v -p "\x2c\x00\x00\xf3"
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)
TX | 2C 00 00 F3 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |,...|
RX | 2D AA 55 99 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |-.U.|
root@j784s4-evm:~# devmem2 0x02100000
/dev/mem opened.

ERROR: Unhandled External Abort received on 0x80000001 from S-EL1
ERROR: exception reason=0 syndrome=0xbf000000
Unhandled Exception from EL0
x0 = 0x0000ffffa23171e0
x1 = 0x0000000000000030
x2 = 0x0000000000000008
x3 = 0x0000000000000000
x4 = 0x0000000000000000
x5 = 0x00000000297c02c9
x6 = 0x000000000000002e
x7 = 0x000000000000000a
x8 = 0x0000000000000040
x9 = 0xffffff80ffffffc8
x10 = 0x0000000000000000
x11 = 0x0000ffffe6932400
x12 = 0x000000000000000c
x13 = 0x0000000000000010
x14 = 0x0000000000000001
x15 = 0x0000000000000000
x16 = 0x0000000000411ff8
x17 = 0x0000ffffa22f8e38
x18 = 0x0000000000000000
x19 = 0x0000ffffa230f000
x20 = 0x0000000000001000
x21 = 0x0000000002100000

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Unlocking this thread.

ford,

any further update on this issue? Were you able to read SPI registers?

Regards,

Brijesh

0 ford zhou over 3 years ago in reply to Brijesh Jadav

Prodigy 10 points

Hi Brijesh

Can not read SPI CFG registers still.

Regards!

Ford

0 Brijesh Jadav over 3 years ago in reply to ford zhou

TI__Guru**** 497805 points

Hi ford,

Are you using any firmware on R5F ie mcu2_0? If yes, can you please add below statement in the main API and see if SPI5 is accessible? or you can add it in ti-processor-sdk-rtos-j784s4-evm-08_05_00_11\vision_apps\utils\hwa\src\app_hwa.c, may be in appFvid2Init API.

This will power on McSPI5 from R5F and then you should access to the register of McSPI5.

SET_DEVICE_STATE_ON(TISCI_DEV_MCSPI5);

Regards,

Brijesh

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TDA4VM: TDA4VH Main SPI controller issue