Add a lock around the SPI bus

This seems to have been the cause of recurring deadlocks that have been
difficult to repo.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/drivers/display.cpp b/src/drivers/display.cpp
index 48310074..a06320f4 100644
--- a/src/drivers/display.cpp
+++ b/src/drivers/display.cpp
@@ -34,6 +34,7 @@
 #include "gpios.hpp"
 #include "misc/lv_color.h"
 #include "soc/soc.h"
+#include "spi.hpp"
 #include "tasks.hpp"
 
 static const char* kTag = "DISPLAY";
@@ -267,8 +268,12 @@ void Display::SendTransaction(TransactionType type,
 
   gpio_set_level(kDisplayDr, type);
 
-  // TODO(jacqueline): Handle these errors.
-  esp_err_t ret = spi_device_transmit(handle_, &sTransaction);
+  esp_err_t ret;
+  {
+    auto lock = drivers::acquire_spi();
+    // TODO(jacqueline): Handle these errors.
+    ret = spi_device_transmit(handle_, &sTransaction);
+  }
   ESP_ERROR_CHECK(ret);
 }