From 9d82bf91e3de19bd502ff1f833990d5151e9c46b Mon Sep 17 00:00:00 2001
From: Matthias Ringwald <matthias@ringwald.ch>
Date: Wed, 27 Nov 2024 11:41:19 +0100
Subject: [PATCH] main: support for more gpios and timers

---
 src/main.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/src/main.c b/src/main.c
index 351c1a5..a3fdc0c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -31,6 +31,7 @@
 #include <zephyr/bluetooth/buf.h>
 #include <zephyr/bluetooth/hci_raw.h>
 
+#include <nrfx_timer.h>
 #include "audio_sync_timer.h"
 
 #define LOG_MODULE_NAME hci_uart
@@ -369,6 +370,9 @@ static const struct gpio_dt_spec timesync_pin = GPIO_DT_SPEC_GET(TIMESYNC_GPIO,
 #error "No timesync gpio available!"
 #endif
 
+#define ALTERNATE_TOGGLE_GPIO DT_NODELABEL(alternate_toggle)
+static const struct gpio_dt_spec alternate_toggle_pin = GPIO_DT_SPEC_GET(ALTERNATE_TOGGLE_GPIO, gpios);
+
 #define  HCI_CMD_ISO_TIMESYNC	(0x200)
 
 struct hci_cmd_iso_timestamp_response {
@@ -468,8 +472,48 @@ static uint32_t toggle_and_get_time(void) {
 
 #endif
 
+
+#define TIME_TO_WAIT_MS 1000
+#define SYNC_TOGGLE_TIMER_INSTANCE_NUMBER 2
+static const nrfx_timer_t sync_toggle_timer_instance =
+	NRFX_TIMER_INSTANCE(SYNC_TOGGLE_TIMER_INSTANCE_NUMBER);
+
+static nrfx_timer_config_t cfg = {.frequency = NRFX_MHZ_TO_HZ(1UL),
+				  .mode = NRF_TIMER_MODE_TIMER,
+				  .bit_width = NRF_TIMER_BIT_WIDTH_32,
+				  .interrupt_priority = NRFX_TIMER_DEFAULT_CONFIG_IRQ_PRIORITY,
+				  .p_context = NULL};
+
+static void sync_toggle_timer_isr_handler(nrf_timer_event_t event_type, void *p_context){
+	ARG_UNUSED(p_context);
+	if(event_type == NRF_TIMER_EVENT_COMPARE1)
+	{
+		uint32_t remainder_us = nrf_timer_cc_get(NRF_TIMER2, NRF_TIMER_CC_CHANNEL1);
+		gpio_pin_toggle_dt( &alternate_toggle_pin );
+
+		LOG_INF("HS Timer: %d", remainder_us );
+
+		uint32_t next_timeout_ticks = remainder_us + nrfx_timer_ms_to_ticks(&sync_toggle_timer_instance, TIME_TO_WAIT_MS);
+		nrfx_timer_compare(&sync_toggle_timer_instance, NRF_TIMER_CC_CHANNEL1, next_timeout_ticks, true);
+	}
+}
+
 int main(void)
 {
+	// timer setup
+	nrfx_err_t ret;
+	ret = nrfx_timer_init(&sync_toggle_timer_instance, &cfg, sync_toggle_timer_isr_handler);
+	if (ret - NRFX_ERROR_BASE_NUM) {
+		LOG_ERR("nrfx timer init error: %d", ret);
+		return -ENODEV;
+	}
+	uint32_t desired_ticks = nrfx_timer_ms_to_ticks(&sync_toggle_timer_instance, TIME_TO_WAIT_MS);
+	nrfx_timer_compare(&sync_toggle_timer_instance, NRF_TIMER_CC_CHANNEL1, desired_ticks, true);
+	IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_TIMER_INST_GET(SYNC_TOGGLE_TIMER_INSTANCE_NUMBER)), IRQ_PRIO_LOWEST,
+			NRFX_TIMER_INST_HANDLER_GET(SYNC_TOGGLE_TIMER_INSTANCE_NUMBER), 0, 0);
+	nrfx_timer_enable(&sync_toggle_timer_instance);
+
+
 	/* incoming events and data from the controller */
 	static K_FIFO_DEFINE(rx_queue);
 	int err;