From 968d545d6735cd5a5c41574248fd5aeaa81471e7 Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Tue, 30 Jan 2024 12:10:23 +1100
Subject: hand off the sd card to the samd properly, and remount when it's
 finished

---
 src/system_fsm/running.cpp | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

(limited to 'src/system_fsm/running.cpp')

diff --git a/src/system_fsm/running.cpp b/src/system_fsm/running.cpp
index ec448657..60103086 100644
--- a/src/system_fsm/running.cpp
+++ b/src/system_fsm/running.cpp
@@ -10,6 +10,7 @@
 #include "db_events.hpp"
 #include "file_gatherer.hpp"
 #include "freertos/projdefs.h"
+#include "gpios.hpp"
 #include "result.hpp"
 
 #include "audio_fsm.hpp"
@@ -55,6 +56,11 @@ void Running::react(const database::event::UpdateFinished&) {
 }
 
 void Running::react(const SdDetectChanged& ev) {
+  if (sServices->samd().UsbMassStorage()) {
+    // We don't currently control the sd card, so don't mess with it.
+    return;
+  }
+
   if (ev.has_sd_card) {
     if (!sStorage && mountStorage()) {
       events::Ui().Dispatch(StorageMounted{});
@@ -64,6 +70,42 @@ void Running::react(const SdDetectChanged& ev) {
   }
 }
 
+void Running::react(const SamdUsbMscChanged& ev) {
+  if (ev.en) {
+    // Stop using the sd card, and power it off.
+    unmountStorage();
+
+    // Set up the SD card for usage by the samd21.
+    auto& gpios = sServices->gpios();
+    gpios.WriteSync(drivers::IGpios::Pin::kSdPowerEnable, 1);
+    gpios.WriteSync(drivers::IGpios::Pin::kSdMuxSwitch,
+                    drivers::IGpios::SD_MUX_SAMD);
+    gpios.WriteSync(drivers::IGpios::Pin::kSdMuxDisable, 0);
+
+    // Off you go!
+    sServices->samd().UsbMassStorage(true);
+  } else {
+    // Make sure the samd knows that its access is going away, and give it time
+    // to finish up any remaining work.
+    sServices->samd().UsbMassStorage(false);
+    vTaskDelay(pdMS_TO_TICKS(250));
+
+    auto& gpios = sServices->gpios();
+    // No more writing, please!
+    gpios.WriteSync(drivers::IGpios::Pin::kSdMuxDisable, 1);
+    vTaskDelay(pdMS_TO_TICKS(100));
+
+    // Reboot the SD card so that it comes up in a consistent state.
+    // TODO: can we avoid doing this?
+    gpios.WriteSync(drivers::IGpios::Pin::kSdPowerEnable, 0);
+
+    // Now it's ready for us.
+    if (mountStorage()) {
+      events::Ui().Dispatch(StorageMounted{});
+    }
+  }
+}
+
 auto Running::mountStorage() -> bool {
   ESP_LOGI(kTag, "mounting sd card");
   auto storage_res = drivers::SdStorage::Create(sServices->gpios());
-- 
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