RE: nrf PDM driver : broken on migration NCS2.6 to NCS2.8

Amanda Hsieh — Wed, 08 Jan 2025 20:36:40 GMT

Hi,

Try to eanble the CONFIG_PM_DEVICE in the prj.conf.

Regards,
Amanda H.

BrianW — Wed, 08 Jan 2025 11:08:33 GMT

I have found the correct macro for getting the interrupt routine:

IRQ_CONNECT(DT_IRQN(PDM_NL), IRQ_PRIO_LOWEST, NRFX_PDM_INST_HANDLER_GET(0), 0, 0);

This now works ok.

However, when I attempt to deinit the pdm driver and set the pins to 'sleep' like this:

if ((errcode = pinctrl_apply_state(PINCTRL_DT_DEV_CONFIG_GET(PDM_NL), PINCTRL_STATE_SLEEP))!=0) {

log_warn("pdmmgr : PDM set to sleep fails, errcode %d",errcode);

}

I get error -2 ie ENOENT. This means that it cannot find the config for the "sleep" case.

The same call used to setup the pins before use is fine:

int errcode = pinctrl_apply_state(PINCTRL_DT_DEV_CONFIG_GET(PDM_NL), PINCTRL_STATE_DEFAULT);

if (errcode!=0) {

log_warn("pdmmgr : PDM pin setup from DTS fails, errcode %d",errcode);

return false;

}

In the DTS I have defined both sets of pinctls:

&pdm0 {

status = "okay";

compatible = "nordic,nrf-pdm";

// label="PDM micro in";

pinctrl-0 = <&pdm0_default>;

pinctrl-1 = <&pdm0_sleep>;

pinctrl-names = "default", "sleep";

clock-source = "ACLK";

};

&pinctrl {

pdm0_default: pdm0_default {

group1 {

psels = <NRF_PSEL(PDM_CLK, 0, 5)>,

<NRF_PSEL(PDM_DIN, 0, 6)>;

};

pdm0_sleep: pdm0_sleep {

group1 {

psels = <NRF_PSEL(PDM_CLK, 0, 5)>,

<NRF_PSEL(PDM_DIN, 0, 6)>;

low-power-enable;

};

Why can't it find the 'sleep' pinctrl set?

(freely admitting the whole DTS thing is still largely opaque and overly complex for me)