fix(sleep): Make sleep work again when BLE is disabled

In commit 4944aa48 ("fix(ble): Update to changes from new SDK")
a call to `BbDrvDisable()` was added to `sleep_deepsleep()`.  This
function must, however, only be called when BLE was previously
initialized, otherwise a wakeup from deepsleep will not be possible (if
it ever reaches it?).

Fix this by reworking the BLE enabled check to also be usable here, to
only call `BbDrvDisable()` when BLE is active.

Fixes: 4944aa48 ("fix(ble): Update to changes from new SDK")
Fixes: #231

epicardium/ble/ble.c

@@ -269,17 +269,26 @@ void RSV11_IRQHandler(void)
 	notify();
 }
 /*************************************************************************************************/
-bool ble_shall_start(void)
+bool ble_is_enabled(void)
 {
-	bool ble_enabled = config_get_boolean_with_default("ble_enable", false);
+	/*
+	 * 0 = unknown, check config
+	 * 1 = disabled
+	 * 2 = enabled
+	 */
+	static int ble_state = 0;
 
-	if (ble_enabled) {
+	if (ble_state == 0) {
+		if (config_get_boolean_with_default("ble_enable", false)) {
+			ble_state = 2;
 			LOG_INFO("ble", "BLE is enabled.");
 		} else {
+			ble_state = 1;
 			LOG_INFO("ble", "BLE is disabled.");
 		}
+	}
 
-	return ble_enabled;
+	return ble_state == 2;
 }
 /*************************************************************************************************/
 static void scheduleTimer(void)

epicardium/main.c

@@ -156,7 +156,7 @@ int main(void)
 	}
 
 	/* BLE */
-	if (ble_shall_start()) {
+	if (ble_is_enabled()) {
 		if (xTaskCreate(
 			    vBleTask,
 			    (const char *)"BLE",

epicardium/modules/modules.h

@@ -93,7 +93,7 @@ int pmic_read_amux(enum pmic_amux_signal sig, float *result);
 
 /* ---------- BLE ---------------------------------------------------------- */
 void vBleTask(void *pvParameters);
-bool ble_shall_start(void);
+bool ble_is_enabled(void);
 void ble_uart_write(uint8_t *pValue, uint8_t len);
 
 /* ---------- Hardware (Peripheral) Locks ---------------------------------- */

epicardium/modules/sleep.c

@@ -190,7 +190,9 @@ void sleep_deepsleep(void)
 	core1_stop();
 	MAX77650_getINT_GLBL();
 	gpio_low_power();
+	if (ble_is_enabled()) {
 		BbDrvDisable();
+	}
 	turnOffClocks();
 	old_clkcn = MXC_GCR->clkcn;
 	switchToHIRC();