NRF9160-SICA-R7 datasheet(202/400 Pages) NORDIC

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Peripherals

(…)

CH[2] 1st result

CH[1] 1st result

RESULT.PTR

16 15

RESULT.PTR + 4

CH[1] 2nd result

CH[5] 1st result

CH[5] 2nd result

CH[2] 2nd result

RESULT.PTR + 8

CH[5] last result

CH[2] last result

RESULT.PTR +

2*(RESULT.MAXCNT – 2)

Figure 66: Example of RAM placement (even RESULT.MAXCNT), channels 1, 2 and 5 enabled

The figure below provides an example of results placement in Data RAM, with an odd RESULT.MAXCNT. In

this example, channels 1, 2 and 5 are enabled, all others are disabled. The last 32-bit word is populated

only with one 16-bit result.

(…)

CH[2] 1st result

CH[1] 1st result

RESULT.PTR

16 15

RESULT.PTR + 4

CH[1] 2nd result

CH[5] 1st result

CH[5] 2nd result

CH[2] 2nd result

RESULT.PTR + 8

CH[5] last result

RESULT.PTR +

2*(RESULT.MAXCNT – 1)

Figure 67: Example of RAM placement (odd RESULT.MAXCNT), channels 1, 2 and 5 enabled

6.12.5 EasyDMA

After configuring RESULT.PTR and RESULT.MAXCNT, the ADC resources are started by triggering the START

task. The ADC is using EasyDMA to store results in a Result buffer in RAM.

The Result buffer is located at the address specified in the RESULT.PTR register. The RESULT.PTR register

is double-buffered and it can be updated and prepared for the next START task immediately after the

STARTED event is generated. The size of the Result buffer is specified in the RESULT.MAXCNT register

and the ADC will generate an END event when it has filled up the Result buffer, see ADC on page 203.

Results are stored in little-endian byte order in Data RAM. Every sample will be sign extended to 16 bit

before stored in the Result buffer.

The ADC is stopped by triggering the STOP task. The STOP task will terminate an ongoing sampling. The

ADC will generate a STOPPED event when it has stopped. If the ADC is already stopped when the STOP task

is triggered, the STOPPED event will still be generated.

4418_1315 v2.0

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