TDA4VM: TDA4VM-spi0回环测试

yk z

Prodigy 200 points

Part Number: TDA4VM

你好，

请问一下

我需要测试spi 0 spi1 spi 2总线的读写，

将spi0的d0 d1转接在一起，发现tx 有数据波形出来，但rx就是没有读到数据

对应的dts

main_spi0: spi@2100000 {
compatible = "ti,am654-mcspi","ti,omap4-mcspi";
reg = <0x0 0x2100000 0x0 0x400>;
interrupts = <GIC_SPI 184 IRQ_TYPE_LEVEL_HIGH>; //222-190 32
clocks = <&k3_clks 260 1>;
power-domains = <&k3_pds 260 TI_SCI_PD_EXCLUSIVE>;
#address-cells = <1>;
#size-cells = <0>;
};

&main_spi0 {
status="okay";
pinctrl-names = "default";
pinctrl-0 = <&spi0_pins_default>;
//ti,pindir-d0-out-d1-in;
//spi-slave;
spidev@0 {
spi-max-frequency = <24000000>;
reg = <0>;
compatible = "linux,spidev";
};
};

spi0_pins_default: spi0_pins_default {
pinctrl-single,pins = <
J721E_IOPAD(0x1cc, PIN_OUTPUT, 0) /* AB5 SPI0_D0*/
J721E_IOPAD(0x1d0, PIN_OUTPUT, 0) /* AA3 SPI0_D1*/
J721E_IOPAD(0x1c8, PIN_OUTPUT, 0) /* AA1 SPI0_Clk*/
J721E_IOPAD(0x1c0, PIN_OUTPUT, 0) /* AA2 SPI0_CS0*/
>;
};

1 年多前

0 yk z 1 年多前

Prodigy 200 points

root@j7-evm:~# spidev_test -D /dev/spidev5.0 -s 50000000 -v -p UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
spi mode: 0x0
bits per word: 8
max speed: 50000000 Hz (50000 KHz)
TX | 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 |UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU|
TX | 55 55 55 55 55 55 55 55 55 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |UUUUUUUUU|
RX | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................................|
RX | 00 00 00 00 00 00 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |.........|

0 Shine 1 年多前

TI__Guru**** 357097 points

yk z 说：
spi0_pins_default: spi0_pins_default {
pinctrl-single,pins = <
J721E_IOPAD(0x1cc, PIN_OUTPUT, 0) /* AB5 SPI0_D0*/
J721E_IOPAD(0x1d0, PIN_OUTPUT, 0) /* AA3 SPI0_D1*/
J721E_IOPAD(0x1c8, PIN_OUTPUT, 0) /* AA1 SPI0_Clk*/
J721E_IOPAD(0x1c0, PIN_OUTPUT, 0) /* AA2 SPI0_CS0*/

D0, D1都设成OUTPUT模式了，应该是一个输入，一个输出模式。

+1 yk z 1 年多前回复 Shine

Prodigy 200 points

谢谢，测试了一下，好像是那么回事，正常使用读取外设也是一个out,一个in要写明嘛

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TDA4VM: TDA4VM-spi0回环测试