16Mhz xtal output via a PORT PIN

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Last post
Fri, 2017-05-12 17:55
#1
Shashk
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加入:2015-01-05 19:07
16Mhz xtal output via a PORT PIN

Hi,
I would like to have the 16Mhz xtal output via a PORT PIN for accurate measurement of crystal frequency without loading using a oscilloscope probe. Is there a way to do that in software?

Part : DA14585

Thanks
Shashi

Device:
DA14585
Mon, 2017-05-15 17:02
MT_dialog
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Last seen:1 week 2 days ago
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加入:2015-06-08 11:34
Hi Shashk,

Hi Shashk,

There is the possibility to output the XTAL16 on the P05 of the when the device is in test mode, just use the below commands:

SetWord32 (TEST_CTRL_REG, 1);/ /这will put the device is test mode
SetWord32(P05_MODE_REG, 0x300); // This will configure the mode of the P05 as output

Usually for trimming the XTAL 16 the prod_test fw is used that communicates via UART with the Smart Snippets and the RF master tool and through a frequency counter connected to the P05 pin the trimming value is calculated. Regarding doing this via sw the PLT tool has a method of calibrating the XTAL16 automatically but without using the XTAL pulse on a pin, just by applying a 500msec pulse and checking a counter.

Regarding calculating the trimming value by sw, as i ve mentioned the PLT tool applies a special algorithm in order to aquire the trimming value of the XTAL, you will be able to check the code in the prod_test project in the dialog_commands.c file, check the dialog_commands_xtal_trim_handler() function.

Thanks MT_dialog