shithub: m8c

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Implement send_ping function for device communication (#213)

--- a/src/backends/m8_libserialport.c

+++ b/src/backends/m8_libserialport.c

@@ -273,6 +273,18 @@

   return initialize_serial_thread();

 }

+static int send_ping() {

+  SDL_LogDebug(SDL_LOG_CATEGORY_SYSTEM, "Sending ping");

+  const unsigned char buf[1] = {'X'};

+  const size_t nbytes = 1;

+  const int result = sp_blocking_write(m8_port, buf, nbytes, 5);

+  if (result != nbytes) {

+    SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Error sending ping, code %d", result);

+    return 0;

+  }

+  return 1;

+}

+

 int m8_send_msg_controller(const uint8_t input) {

   SDL_LogDebug(SDL_LOG_CATEGORY_SYSTEM, "Sending controller input %d", input);

   const unsigned char buf[2] = {'C', input};

@@ -399,6 +411,12 @@

     if (empty_cycles >= conf->wait_packets) {

       // try opening the serial port to check if it's alive

       if (serial_port_connected()) {

+        // check if the device responds to display reset

+        if (!send_ping()) {

+          SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Failed to ping device on reconnect");

+          disconnect();

+          return DEVICE_DISCONNECTED;

+        }

         // the device is still there, carry on

         empty_cycles = 0;

         return DEVICE_PROCESSING;

-- 

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