SWCU192 User guide

SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7

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11. 993
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997

26.3.2.2 Command Status

After a command is issued, the CMDSTA register is updated by the radio CPU, causing an RFCMDACK interrupt to be sent back to the system CPU. This update occurs after the command finishes for immediate and direct commands and after the command is scheduled for radio operation commands. No new command may be issued until this interrupt is received. The CMDSTA register consists of 32 bits; the 8 LSBs give the result, while the upper 24 bits may be used for specific signaling in each command. Figure 26-5 shows this format.

Figure 26-5 Format of CMDSTA Register

In the result byte, bit 7 indicates whether an error occurred or not. The result byte of 0x00, meaning pending, is produced automatically by the radio doorbell hardware when a command is issued, and the other bits in the CMDSTA register also become 0, which is the value of CMDSTA before the RF_CMD_ACK interrupt is raised.

Table 26-2 lists the values of the result byte in the CMDSTA register.

Table 26-2 Values of the Result Byte in the CMDSTA Register

Value	Name	Description
No Error
0x00	Pending	The command has not been parsed.
0x01	Done	Immediate command: The command finished successfully. Radio operation command: The command was successfully submitted for execution.
Error
0x81	IllegalPointer	The pointer signaled in CMDR is not valid.
0x82	UnknownCommand	The command ID number in the command structure is unknown.
0x83	UnknownDirCommand	The command number for a direct command is unknown, or the command is not a direct command.
0x85	ContextError	An immediate or direct command was issued in a context where it is not supported.
0x86	SchedulingError	A radio operation command was attempted to be scheduled while another operation was already running in the RF core. The new command is rejected, while the command already running is not impacted.
0x87	ParError	There were errors in the command parameters that are parsed on submission. For radio operation commands, errors in parameters parsed after start of the command are signaled by the command ending, and an error is indicated in the status field of that command structure.
0x88	QueueError	An operation on a data entry queue was attempted, but the operation was not supported by the queue in its current state.
0x89	QueueBusy	An operation on a data entry was attempted while that entry was busy.

In addition to the command status register, each radio operation command contains a status field (see Table 26-9). This field may have values in the following categories.

Idle: The command has not started.
Pending: The command is parsed, but the start trigger has not yet occurred.
Active: The command is running.
Suspended: The command was active, and may become active again. The command is supported only by certain IEEE 802.15.4 commands.
Finished: The command is finished, and the system CPU is free to modify the command structure or free memory.
Skipped: The command was skipped and never executed.

Table 26-3 lists the status codes for common commands and when parsing any command before starting.

Table 26-3 Common Radio Operation Status Codes

Number	Name	Description
Operation Not Finished
0x0000	IDLE	Operation has not started.
0x0001	PENDING	Waiting for start trigger.
0x0002	ACTIVE	Running operation.
0x0003	SKIPPED	Operation skipped due to condition in another command.
Operation Finished Normally
0x0400	DONE_OK	Operation ended normally.
0x0401	DONE_COUNTDOWN	Counter reached zero.
0x0402	DONE_RXERR	Operation ended with CRC error.
0x0403	DONE_TIMEOUT	Operation ended with time-out.
0x0404	DONE_STOPPED	Operation stopped after CMD_STOP command.
0x0405	DONE_ABORT	Operation aborted by CMD_ABORT command.
Operation Finished With Error
0x0800	ERROR_PAST_START	The start trigger occurred in the past.
0x0801	ERROR_START_TRIG	Illegal start trigger parameter.
0x0802	ERROR_CONDITION	Illegal condition for next operation.
0x0803	ERROR_PAR	Error in a command specific parameter.
0x0804	ERROR_POINTER	Invalid pointer to next operation.
0x0805	ERROR_CMDID	Next operation has a command ID that is undefined or not a radio operation command.
0x0807	ERROR_NO_SETUP	Operation using RX, TX or synthesizer attempted without CMD_RADIO_SETUP.
0x0808	ERROR_NO_FS	Operation using RX or TX attempted without the synthesizer being programmed or powered on.
0x0809	ERROR_SYNTH_PROG	Synthesizer programming failed.
0x080A	ERROR_TXUNF	Modem TX underflow observed.
0x080B	ERROR_RXOVF	Modem RX overflow observed.
0x080C	ERROR_NO_RX	Data requested from last RX when no such data exists.

When the system CPU prepares a command structure, the CPU should initialize the status field to IDLE. Commands may be set up in a loop. If so, the system CPU must not modify command structures until the radio CPU becomes idle (the system CPU receives a LAST_COMMAND_DONE interrupt, even if the status is finished or skipped (see Section 26.11.2).