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DMAx_INT field descriptions (continued)
Field
Description
0
The interrupt request for corresponding channel is cleared
1
The interrupt request for corresponding channel is active
4
INT4
Interrupt Request 4
0
The interrupt request for corresponding channel is cleared
1
The interrupt request for corresponding channel is active
3
INT3
Interrupt Request 3
0
The interrupt request for corresponding channel is cleared
1
The interrupt request for corresponding channel is active
2
INT2
Interrupt Request 2
0
The interrupt request for corresponding channel is cleared
1
The interrupt request for corresponding channel is active
1
INT1
Interrupt Request 1
0
The interrupt request for corresponding channel is cleared
1
The interrupt request for corresponding channel is active
0
INT0
Interrupt Request 0
0
The interrupt request for corresponding channel is cleared
1
The interrupt request for corresponding channel is active
20.3.18 Error Register (DMAx_ERR)
The ERR provides a bit map for the channels, signaling the presence of an error for each
channel. The eDMA engine signals the occurrence of an error condition by setting the
appropriate bit in this register. The outputs of this register are enabled by the contents of
the EEI, and then routed to the interrupt controller. During the execution of the interrupt-
service routine associated with any DMA errors, it is software’s responsibility to clear the
appropriate bit, negating the error-interrupt request. Typically, a write to the CERR in the
interrupt-service routine is used for this purpose. The normal DMA channel completion
indicators (setting the transfer control descriptor DONE flag and the possible assertion of
an interrupt request) are not affected when an error is detected.
The contents of this register can also be polled because a non-zero value indicates the
presence of a channel error regardless of the state of the EEI. The state of any given
channel’s error indicators is affected by writes to this register; it is also affected by writes
to the CERR. On writes to the ERR, a one in any bit position clears the corresponding
channel’s error status. A zero in any bit position has no affect on the corresponding
channel’s current error status. The CERR is provided so the error indicator for a single
channel can easily be cleared.
Chapter 20 Enhanced Direct Memory Access (eDMA)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
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