Support changing the usb msc state

src/app_console/app_console.cpp

@@ -39,6 +39,7 @@
 #include "index.hpp"
 #include "lua_thread.hpp"
 #include "memory_resource.hpp"
+#include "samd.hpp"
 #include "service_locator.hpp"
 #include "system_events.hpp"
 #include "track.hpp"
@@ -414,14 +415,15 @@ int CmdSamd(int argc, char** argv) {
     std::cout << usage << std::endl;
     return 1;
   }
+  drivers::Samd& samd = AppConsole::sServices->samd();
 
   std::pmr::string cmd{argv[1]};
   if (cmd == "flash") {
     std::cout << "resetting samd..." << std::endl;
     vTaskDelay(pdMS_TO_TICKS(5));
-    AppConsole::sServices->samd().ResetToFlashSamd();
+    samd.ResetToFlashSamd();
   } else if (cmd == "charge") {
-    auto res = AppConsole::sServices->samd().GetChargeStatus();
+    auto res = samd.GetChargeStatus();
     if (res) {
       switch (res.value()) {
         case drivers::Samd::ChargeStatus::kNoBattery:
@@ -446,6 +448,10 @@ int CmdSamd(int argc, char** argv) {
     } else {
       std::cout << "unknown" << std::endl;
     }
+  } else if (cmd == "msc") {
+    bool current = samd.UsbMassStorage();
+    std::cout << "toggling to: " << !current << std::endl;
+    samd.UsbMassStorage(!current);
   } else if (cmd == "off") {
     std::cout << "bye !!!" << std::endl;
     vTaskDelay(pdMS_TO_TICKS(5));

src/drivers/include/samd.hpp

@@ -54,6 +54,9 @@ class Samd {
   auto ResetToFlashSamd() -> void;
   auto PowerDown() -> void;
 
+  auto UsbMassStorage(bool en) -> void;
+  auto UsbMassStorage() -> bool;
+
   // Not copyable or movable. There should usually only ever be once instance
   // of this class, and that instance will likely have a static lifetime.
   Samd(const Samd&) = delete;

src/drivers/samd.cpp

@@ -143,4 +143,30 @@ auto Samd::PowerDown() -> void {
   ESP_ERROR_CHECK(transaction.Execute(3));
 }
 
+auto Samd::UsbMassStorage(bool en) -> void {
+  I2CTransaction transaction;
+  transaction.start()
+      .write_addr(kAddress, I2C_MASTER_WRITE)
+      .write_ack(Registers::kUsbControl, en)
+      .stop();
+  ESP_ERROR_CHECK(transaction.Execute(3));
+}
+
+auto Samd::UsbMassStorage() -> bool {
+  uint8_t raw_res;
+  I2CTransaction transaction;
+  transaction.start()
+      .write_addr(kAddress, I2C_MASTER_WRITE)
+      .write_ack(Registers::kUsbControl)
+      .start()
+      .write_addr(kAddress, I2C_MASTER_READ)
+      .read(&raw_res, I2C_MASTER_NACK)
+      .stop();
+  esp_err_t res = transaction.Execute(1);
+  if (res != ESP_OK) {
+    return false;
+  }
+  return raw_res & 1;
+}
+
 }  // namespace drivers