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Update CallbackExample9_UseCallbackDataInLoop.ino

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This commit is contained in:
PaulZC
2022-04-15 10:59:02 +01:00
parent 03802cb959
commit 5d06159a79
1 changed files with 12 additions and 55 deletions
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examples/Callbacks/CallbackExample9_UseCallbackDataInLoop/CallbackExample9_UseCallbackDataInLoop.ino
+12 -55
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@@ -7,10 +7,9 @@
basically do whatever you want with this code.
This example shows how to access the callback data from the main loop.
The simple way is to use a global flag: set it in the callback, check it and clear it in the main loop.
The simple way to check if new data is available is to use a global flag: set it in the callback, check it and clear it in the main loop.
Or, you can be more sophisticated and use the callback flags themselves.
Uncomment the #define useGlobalFlag below to use the simple method.
This example shows how to use the sophisticated method.
Feel like supporting open source hardware?
Buy a board from SparkFun!
@@ -24,12 +23,6 @@
Open the serial monitor at 115200 baud to see the output
*/
//#define useGlobalFlag // Uncomment this line to use a global flag to indicate that the callback data is valid
#ifdef useGlobalFlag
bool newPVTdata = false;
#endif
#include <Wire.h> //Needed for I2C to GPS
#include <SparkFun_u-blox_GNSS_Arduino_Library.h> //http://librarymanager/All#SparkFun_u-blox_GNSS
@@ -44,13 +37,7 @@ SFE_UBLOX_GNSS myGNSS;
// | | |
void callbackPVT(UBX_NAV_PVT_data_t *ubxDataStruct)
{
#ifdef useGlobalFlag // If we are using the global flag
newPVTdata = true;
#endif
Serial.println(F("Hey! The NAV PVT callback has been called!"));
}
void setup()
@@ -79,49 +66,17 @@ void setup()
void loop()
{
myGNSS.checkUblox(); // Check for the arrival of new data and process it.
// Check if new NAV PVT data has been received:
// If myGNSS.packetUBXNAVPVT->automaticFlags.flags.bits.callbackCopyValid is true, it indicates new PVT data has been received and has been copied.
// automaticFlags.flags.bits.callbackCopyValid will be cleared automatically when the callback is called.
#ifndef useGlobalFlag // If we are not using the global flag
static bool callbackDataValid = false; // Flag to show that fresh callback data is available
// Is the callback data valid?
// If automaticFlags.flags.bits.callbackCopyValid is true, it indicates new PVT data has been received and has been copied
// automaticFlags.flags.bits.callbackCopyValid will be cleared when the callback is called
if ((callbackDataValid == false) && (myGNSS.packetUBXNAVPVT->automaticFlags.flags.bits.callbackCopyValid == true))
if (myGNSS.packetUBXNAVPVT->automaticFlags.flags.bits.callbackCopyValid == true)
{
Serial.println(F("NAV PVT callback data is now valid"));
callbackDataValid = true; // Set the flag
}
#endif
myGNSS.checkCallbacks(); // Check if any callbacks are waiting to be processed.
// Check if new PVT data has been received
#ifdef useGlobalFlag
if (newPVTdata)
{
#else // If we are not using the global flag
// automaticFlags.flags.bits.callbackCopyValid will have been cleared after the callback was called
if ((callbackDataValid == true) && (myGNSS.packetUBXNAVPVT->automaticFlags.flags.bits.callbackCopyValid == false))
{
callbackDataValid = false; // Clear the flag
#endif
// But, we can manually clear the callback flag too. This will prevent the callback from being called!
myGNSS.packetUBXNAVPVT->automaticFlags.flags.bits.callbackCopyValid = false; // Comment this line if you still want the callback to be called
Serial.println();
@@ -158,6 +113,8 @@ void loop()
Serial.println(F(" (mm)"));
}
myGNSS.checkCallbacks(); // Check if any callbacks are waiting to be processed. There will not be any in this example, unless you commented the line above
Serial.print(".");
delay(50);
}