Espressif ESP32-S2 Programming Manual page 945

Chapter 2. API Reference
Clear bits within an event group. This function cannot be called from an interrupt.
Example usage:
#define BIT_0 ( 1 << 0 )
#define BIT_4 ( 1 << 4 )
void aFunction( EventGroupHandle_t xEventGroup )
{
EventBits_t uxBits;
// Clear bit
uxBits = xEventGroupClearBits(
if( ( uxBits
{
// Both bit
// called.
}
else if( ( uxBits
{
// Bit
// now be
}
else if( ( uxBits
{
// Bit
// now be
}
else
{
// Neither bit
}
}
Return The value of the event group before the specified bits were cleared.
Parameters
• xEventGroup: The event group in which the bits are to be cleared.
• uxBitsToClear: A bitwise value that indicates the bit or bits to clear in the event group. For
example, to clear bit 3 only, set uxBitsToClear to 0x08. To clear bit 3 and bit 0 set uxBitsToClear
to 0x09.
EventBits_t xEventGroupSetBits(EventGroupHandle_t
Set bits within an event group. This function cannot be called from an interrupt. xEventGroupSetBits-
FromISR() is a version that can be called from an interrupt.
Setting bits in an event group will automatically unblock tasks that are blocked waiting for the bits.
Example usage:
#define BIT_0 ( 1 << 0 )
#define BIT_4 ( 1 << 4 )
void aFunction( EventGroupHandle_t xEventGroup )
{
EventBits_t uxBits;
// Set bit
uxBits = xEventGroupSetBits(
Espressif Systems
0 and bit 4 in xEventGroup.
xEventGroup,
BIT_0 |
& ( BIT_0 | BIT_4 ) )
0 and bit 4 were
Both will now be clear
& BIT_0 ) !=
0 was set before xEventGroupClearBits() was
clear.
& BIT_4 ) !=
4 was set before xEventGroupClearBits() was
clear.
0 nor bit 4
0 and bit 4 in xEventGroup.
xEventGroup,
BIT_0 | BIT_4
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// The event group being
BIT_4 );// The bits being
== ( BIT_0 | BIT_4 ) )
set before xEventGroupClearBits() was
(not set).
0 )
0 )
were set in the first
xEventGroup, const
// The event group being
);// The bits being
934
updated.
cleared.
called. It will
called. It will
place.
EventBits_t uxBitsToSet)
updated.
set.
(continues on next page)
Release v4.4