TDA4VM-Q1: mcspi1's Mosi/MISO has no data waveform

Ling ling

Intellectual 485 points

Part Number: TDA4VM-Q1
Other Parts Discussed in Thread: TDA4VM, SYSCONFIG

HI experts.

I use MCSPI1 (SPI1_CLK/SPI1_CS/SPI1_D0/SPI_D1) on tda4vm.

sdk:linux 08_04_00_11 ,rtos 08_04_00_06

I configured the device tree as follows. Also added in the kernel config file.

CONFIG_SPI_SPIDEV=y

CONFIG_SPI_OMAP24XX=y

So I have the SPIDEV node under dev, Once I boot Linux one should entries like below:

root@j7-evm:~# ls  -l /sys/class/spi*
/sys/class/spi_master:
total 0
lrwxrwxrwx 1 root root 0 Apr  3 08:41 spi0 -> ../../devices/platform/bus@100000/2110000.spi/spi_master/spi0

/sys/class/spidev:
total 0
lrwxrwxrwx 1 root root 0 Apr  3 08:41 spidev0.0 -> ../../devices/platform/bus@100000/2110000.spi/spi_master/spi0/spi0.0/spidev/spidev0.0

When I used spidev_test to send data, there is no data on mosi.

root@j7-evm:~# ./spidev_test -D /dev/spidev0.0 -v -H  -p 0x12345678 
TX | 30 78 31 32 33 34 35 36 37 38 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __  |0x12345678|
RX | 00 00 00 00 00 00 00 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ _

waveform1 (yellow) :cs

waveform2 (green) :mosi

waveform3 (purple) :miso

From the waveform I can see that the CS pin is being pulled down, but there is no data (0x12345678) being sent on Mosi.

What are the possible reasons for this?

over 2 years ago

0 Keerthy J over 2 years ago

TI__Guru**** 163360 points

Hi,

It seems like you have not done the pinmux configuration:

Please follow the reference FAQ:

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

Best Regards,
Keerthy

0 Ling ling over 2 years ago in reply to Keerthy J

Intellectual 485 points

hi,

I have set the pinctrl,

pinctrl-names = "default";
pinctrl-0 = < &spi1_pins_default &tja1105_pins_default>;

spi1_pins_default: spi1-pins-default {
pinctrl-single,pins = <
        J721E_IOPAD(0x1dc, PIN_INPUT, 0) /* (Y1) SPI1_CLK */
        J721E_IOPAD(0x1d4, PIN_INPUT, 0) /* (Y3) SPI1_CS0 */
        J721E_IOPAD(0x1e0, PIN_INPUT, 0) /* (Y5) SPI1_D0 */
        J721E_IOPAD(0x1e4, PIN_INPUT, 0) /* (Y2) SPI1_D1 */
		>;
	};

And dump the memory, it all has been set okay （0x00050000，）. But there's still no data on Mosi. Any other reasons?

devmem2 0x0011C1d4 
devmem2 0x0011C1dc 
devmem2 0x0011C1e0     
devmem2 0x0011C1e4

root@j7-evm:~# devmem2 0x0011C1d4 
/dev/mem opened.
Memory mapped at address 0xffffb478e000.
Read at address  0x0011C1D4 (0xffffb478e1d4): 0x00050000
devmem2 0x0011C1d8 
root@j7-evm:~# devmem2 0x0011C1dc 
devmem2 0x0011C1e4 /dev/mem opened.
Memory mapped at address 0xffffbcb7e000.
Read at address  0x0011C1DC (0xffffbcb7e1dc): 0x00050000
root@j7-evm:~# devmem2 0x0011C1e0     
/dev/mem opened.
Memory mapped at address 0xffff8d970000.
Read at address  0x0011C1E0 (0xffff8d9701e0): 0x00050000
root@j7-evm:~# devmem2 0x0011C1e4 
/dev/mem opened.
Memory mapped at address 0xffffa618e000.
Read at address  0x0011C1E4 (0xffffa618e1e4): 0x00050000

0 Keerthy J over 2 years ago in reply to Ling ling

TI__Guru**** 163360 points

Hi,

This is from the sysconfig:

&main_pmx0 {
	myspi1_pins_default: myspi1_pins_default {
		pinctrl-single,pins = <
			J721E_IOPAD(0x1dc, PIN_INPUT, 0) /* (Y1) SPI1_CLK */
			J721E_IOPAD(0x1d4, PIN_INPUT, 0) /* (Y3) SPI1_CS0 */
			J721E_IOPAD(0x1d8, PIN_INPUT, 0) /* (W4) SPI1_CS1 */
			J721E_IOPAD(0xa8, PIN_INPUT, 1) /* (AD19) PRG1_MDIO0_MDIO.SPI1_CS2 */
			J721E_IOPAD(0xac, PIN_INPUT, 1) /* (AD18) PRG1_MDIO0_MDC.SPI1_CS3 */
			J721E_IOPAD(0x1e0, PIN_INPUT, 0) /* (Y5) SPI1_D0 */
			J721E_IOPAD(0x1e4, PIN_INPUT, 0) /* (Y2) SPI1_D1 */
		>;
	};

Can you try with this pinmux?

- Keerthy

0 Ling ling over 2 years ago in reply to Keerthy J

Intellectual 485 points

Hi,

I have set the same pinctrl, the waveform is still the same. There is no data on mosi.

I'm very confused.

&main_pmx0 {
myspi1_pins_default: myspi1_pins_default {
pinctrl-single,pins = <
J721E_IOPAD(0x1dc, PIN_INPUT, 0) /* (Y1) SPI1_CLK */
J721E_IOPAD(0x1d4, PIN_INPUT, 0) /* (Y3) SPI1_CS0 */
J721E_IOPAD(0x1d8, PIN_INPUT, 0) /* (W4) SPI1_CS1 */
J721E_IOPAD(0xa8, PIN_INPUT, 1) /* (AD19) PRG1_MDIO0_MDIO.SPI1_CS2 */
J721E_IOPAD(0xac, PIN_INPUT, 1) /* (AD18) PRG1_MDIO0_MDC.SPI1_CS3 */
J721E_IOPAD(0x1e0, PIN_INPUT, 0) /* (Y5) SPI1_D0 */
J721E_IOPAD(0x1e4, PIN_INPUT, 0) /* (Y2) SPI1_D1 */
>;
};

0 Keerthy J over 2 years ago in reply to Ling ling

TI__Guru**** 163360 points

Hi,

Can you double confirm the SoC that you are using? Also can you probe the spi clock? Is that running?

Best Regards,

Keerthy

0 Ling ling over 2 years ago in reply to Keerthy J

Intellectual 485 points

hi,

I used XJ721EGALF, and this is the screen print I took.

root@j7-evm:~# ./spidev_test -D /dev/spidev0.0 -v -H  -p 0x12345678 
TX | 30 78 31 32 33 34 35 36 37 38 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __  |0x12345678|
RX | 00 00 00 00 00 00 00 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ _

yes, The clk seems to be running. CLK runs as CS pulls down. The Mosi has not changed and is not sure why it has been high level