Other Parts Discussed in Thread: TDA4VH
Tool/software:
Hi
SDK:10.00.08
Hardware:TDA4VH, custom board
My adc schematic diagram is
my devicetree of adc is
//k3-j784s4-evm.dts
mcu_adc0_pins_default: mcu-adc0-default-pins {
pinctrl-single,pins = <
J784S4_WKUP_IOPAD(0x0cc, PIN_INPUT, 0) /* (P36) MCU_ADC0_AIN0 */
J784S4_WKUP_IOPAD(0x0d0, PIN_INPUT, 0) /* (V36) MCU_ADC0_AIN1 */
J784S4_WKUP_IOPAD(0x0d4, PIN_INPUT, 0) /* (T34) MCU_ADC0_AIN2 */
J784S4_WKUP_IOPAD(0x0d8, PIN_INPUT, 0) /* (T36) MCU_ADC0_AIN3 */
J784S4_WKUP_IOPAD(0x0dc, PIN_INPUT, 0) /* (P34) MCU_ADC0_AIN4 */
J784S4_WKUP_IOPAD(0x0e0, PIN_INPUT, 0) /* (R37) MCU_ADC0_AIN5 */
J784S4_WKUP_IOPAD(0x0e4, PIN_INPUT, 0) /* (R33) MCU_ADC0_AIN6 */
J784S4_WKUP_IOPAD(0x0e8, PIN_INPUT, 0) /* (V38) MCU_ADC0_AIN7 */
>;
};
mcu_adc1_pins_default: mcu-adc1-default-pins {
pinctrl-single,pins = <
J784S4_WKUP_IOPAD(0x0ec, PIN_INPUT, 0) /* (Y38) MCU_ADC1_AIN0 */
J784S4_WKUP_IOPAD(0x0f0, PIN_INPUT, 0) /* (Y34) MCU_ADC1_AIN1 */
J784S4_WKUP_IOPAD(0x0f4, PIN_INPUT, 0) /* (V34) MCU_ADC1_AIN2 */
J784S4_WKUP_IOPAD(0x0f8, PIN_INPUT, 0) /* (W37) MCU_ADC1_AIN3 */
J784S4_WKUP_IOPAD(0x0fc, PIN_INPUT, 0) /* (AA37) MCU_ADC1_AIN4 */
J784S4_WKUP_IOPAD(0x100, PIN_INPUT, 0) /* (W33) MCU_ADC1_AIN5 */
J784S4_WKUP_IOPAD(0x104, PIN_INPUT, 0) /* (U33) MCU_ADC1_AIN6 */
J784S4_WKUP_IOPAD(0x108, PIN_INPUT, 0) /* (Y36) MCU_ADC1_AIN7 */
>;
};
&tscadc0 {
pinctrl-0 = <&mcu_adc0_pins_default>;
pinctrl-names = "default";
status = "okay";
adc {
ti,adc-channels = <0 1 2 3 4 5 6 7>;
};
};
&tscadc1 {
pinctrl-0 = <&mcu_adc1_pins_default>;
pinctrl-names = "default";
status = "okay";
adc {
ti,adc-channels = <0 1 2 3 4 5 6 7>;
};
};
I tested the voltage values of TP2937 and TP2941 with a multimeter and confirmed that there was input voltage at both test points. But when I use the command cat/sys/bus/iio/devices/iio: device1 / in_voltage * _raw, to check the adc value, found that all the value is 0.
Meanwhile, I would like to ask how to confirm whether the ADC module has received the voltage input? Is there a certain register value to represent the status value of GPIO Y38? Or could you offer suggestions for the next step of investigation
Could you take a look ?
Thanks
