tmp: GPIOTE output

Signed-off-by: Marcin Szymczyk <[email protected]>

Author: masz-nordic

samples/subsys/usb/uac2_implicit_feedback/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -47,19 +47,25 @@ i2s_rxtx: &tdm130 {
 /* TDM130 PPI needs routing to TIMER131 through main APB */
 &dppic130 {
 	compatible = "nordic,nrf-dppic-global";
-	owned-channels = <0>;
-	sink-channels = <0>;
-	source-channels = <0>;
-	nonsecure-channels = <0>;
+	owned-channels = <0 2>;
+	sink-channels = <0 2>;
+	source-channels = <0 2>;
+	nonsecure-channels = <0 2>;
 	status = "okay";
 };
 
 /* TIMER131 PPI channel 1 is used for SOF */
 &dppic133 {
 	compatible = "nordic,nrf-dppic-global";
-	owned-channels = <0 1>;
+	owned-channels = <0 1 2>;
 	sink-channels = <0 1>;
+	source-channels = <2>;
+	status = "okay";
+};
+
+&gpiote130 {
 	status = "okay";
+	owned-channels = <0 2>;
 };
 
 &timer131 {

samples/subsys/usb/uac2_implicit_feedback/src/feedback_nrf.c

@@ -47,6 +47,48 @@ static inline void feedback_target_init(void)
 	*(volatile uint32_t *)0x5F9A3C80 = 0x00000082;
 }
 
+#include <nrfx_gpiote.h>
+#include <nrfx_timer.h>
+#include <helpers/nrfx_gppi.h>
+
+static const nrfx_gpiote_t gpiote = NRFX_GPIOTE_INSTANCE(130);
+
+#define GPIOTE_PPI_SOF_PIN    (9 * 32)
+#define GPIOTE_PPI_MAXCNT_PIN (9 * 32) + 1
+
+static uint32_t gpiote_setup(uint32_t pin)
+{
+	uint8_t gpiote_ch;
+	nrfx_err_t err;
+
+	err = nrfx_gpiote_channel_alloc(&gpiote, &gpiote_ch);
+	if (err != NRFX_SUCCESS) {
+		LOG_ERR("failed to allocate gpiote");
+		return 0;
+	}
+
+	nrfx_gpiote_task_config_t task_config = {
+		.task_ch = gpiote_ch,
+		.polarity = NRF_GPIOTE_POLARITY_TOGGLE,
+		.init_val = NRF_GPIOTE_INITIAL_VALUE_LOW
+	};
+	nrfx_gpiote_output_config_t out_config = {
+		.drive = NRF_GPIO_PIN_S0S1,
+		.input_connect = NRF_GPIO_PIN_INPUT_DISCONNECT,
+		.pull = NRF_GPIO_PIN_NOPULL
+	};
+
+	err = nrfx_gpiote_output_configure(&gpiote, pin, &out_config, &task_config);
+	if (err != NRFX_SUCCESS) {
+		LOG_ERR("failed to configure pin");
+		return 0;
+	}
+
+	nrfx_gpiote_out_task_enable(&gpiote, pin);
+
+	return nrfx_gpiote_out_task_address_get(&gpiote, pin);
+}
+
 #else
 #error "Unsupported target"
 #endif
@@ -106,8 +148,14 @@ struct feedback_ctx *feedback_init(void)
 		return &fb_ctx;
 	}
 
+	/* GPIOTE needs to hop through bridge, so we have to set it up first.
+	 * The "forks" are not hopping through, and the GPIOTE would fail if
+	 * setup was called with USB SOF to TIMER CAPTURE.
+	 */
 	nrfx_gppi_channel_endpoints_setup(usbd_sof_gppi_channel,
 		USB_SOF_EVENT_ADDRESS,
+		gpiote_setup(GPIOTE_PPI_SOF_PIN));
+	nrfx_gppi_fork_endpoint_setup(usbd_sof_gppi_channel,
 		nrfx_timer_capture_task_address_get(&feedback_timer_instance,
 			FEEDBACK_TIMER_USBD_SOF_CAPTURE));
 	nrfx_gppi_fork_endpoint_setup(usbd_sof_gppi_channel,
@@ -127,6 +175,8 @@ struct feedback_ctx *feedback_init(void)
 		I2S_FRAMESTART_EVENT_ADDRESS,
 		nrfx_timer_capture_task_address_get(&feedback_timer_instance,
 			FEEDBACK_TIMER_I2S_FRAMESTART_CAPTURE));
+	nrfx_gppi_fork_endpoint_setup(i2s_framestart_gppi_channel,
+		gpiote_setup(GPIOTE_PPI_MAXCNT_PIN));
 
 	nrfx_gppi_channels_enable(BIT(i2s_framestart_gppi_channel));