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xMEMORY_REGION struct
Syntax
typedef struct xMEMORY_REGION
{
void *pvBaseAddress;
uint32_t ulLengthInBytes;
uint32_t ulParameters;
} MemoryRegion_t;
Fields
Field
Declared as
uint32_t
uint32_t
Related Functions
Found 4 other functions taking a xMEMORY_REGION
argument:
Function
Description
Memory regions are assigned to a restricted task when the task is created by a call to xTaskCreateRestricted(). These regions can be redefined using vTaskAllocateMPURegions(). Example usage:
// Define an array of MemoryRegion_t structures that configures an MPU region
// allowing read/write access for 1024 bytes starting at the beginning of the
// ucOneKByte array. The other two of the maximum 3 definable regions are
// unused so set to zero.
static const MemoryRegion_t xAltRegions[ portNUM_CONFIGURABLE_REGIONS ] =
{
// Base address Length Parameters
{ ucOneKByte, 1024, portMPU_REGION_READ_WRITE },
{ 0, 0, 0 },
{ 0, 0, 0 }
};
void vATask( void *pvParameters )
{
// This task was created such that it has access to certain regions of
// memory as defined by the MPU configuration. At some point it is
// desired that these MPU regions are replaced with that defined in the
// xAltRegions const struct above. Use a call to vTaskAllocateMPURegions()
// for this purpose. NULL is used as the task handle to indicate that this
// function should modify the MPU regions of the calling task.
vTaskAllocateMPURegions( NULL, xAltRegions );
// Now the task can continue its function, but from this point on can only
// access its stack and the ucOneKByte array (unless any other statically
// defined or shared regions have been declared elsewhere).
}
Memory regions are assigned to a restricted task when the task is created by a call to xTaskCreateRestricted(). These regions can be redefined using vTaskAllocateMPURegions(). Example usage:
// Define an array of MemoryRegion_t structures that configures an MPU region
// allowing read/write access for 1024 bytes starting at the beginning of the
// ucOneKByte array. The other two of the maximum 3 definable regions are
// unused so set to zero.
static const MemoryRegion_t xAltRegions[ portNUM_CONFIGURABLE_REGIONS ] =
{
// Base address Length Parameters
{ ucOneKByte, 1024, portMPU_REGION_READ_WRITE },
{ 0, 0, 0 },
{ 0, 0, 0 }
};
void vATask( void *pvParameters )
{
// This task was created such that it has access to certain regions of
// memory as defined by the MPU configuration. At some point it is
// desired that these MPU regions are replaced with that defined in the
// xAltRegions const struct above. Use a call to vTaskAllocateMPURegions()
// for this purpose. NULL is used as the task handle to indicate that this
// function should modify the MPU regions of the calling task.
vTaskAllocateMPURegions( NULL, xAltRegions );
// Now the task can continue its function, but from this point on can only
// access its stack and the ucOneKByte array (unless any other statically
// defined or shared regions have been declared elsewhere).
}