C5545 RTC clock out pin - GPIO

Lucian Darie

Prodigy 150 points

Other Parts Discussed in Thread: CC2564, CC2650

Hello,

C5545 doesnt have an RTC clock out pin like C5535.

Is it possible to map this to a GPIO pin and get out the oscillator clock ?

I didnt get how to do it from technical manual.

Thank you,

Lucian

over 9 years ago

0 Mark M over 9 years ago

TI__Mastermind 30631 points

Hi Lucian,

C5545 does not have the RTC_CLKOUT pin that was available on C5535 - the package is smaller and has fewer pins.

You cannot map RTC_CLKOUT to a GPIO with pin muxing.

I think the closest you could come is to use a timer interrupt to toggle a GPIO. Then set the SYSCLK and timer clock divider appropriately to achieve 32768Hz clock frequency.

Maybe with some engineering, you can tap into the RTC_XI signal with a high impedance input to get 32768 Hz without affecting the crystal performance.

Hope this helps,
Mark

0 Lucian Darie over 9 years ago

Prodigy 150 points

Hello Mark,

The dsp x45 has the bluetooth cc2564 attached which needs the 32k7 clock, hoping I could get it from dsp. But finally I decided to add an external clock chip to drive the bt.

Thank you for your support,
Lucian

0 Lucian Darie over 9 years ago in reply to Lucian Darie

Prodigy 150 points

One question if you please so,

Does the x45 booster pack www.ti.com/.../boost5545ulp have the software source/code used public available ?
I dont see it also and I am aware about the chip support library.
But would be helpful to guide myself using already the software demo of the bp if available.

Thank you,
Lucian

0 Lalindra Jayatilleke over 9 years ago in reply to Lucian Darie

TI__Mastermind 30365 points

Lucian,

The software package is teed up to be published very soon. I will update this thread as soon as it's available.
Please bump this thread if you don't hear back from me in a week and I will provide an update.

Lali

0 Lucian Darie over 9 years ago in reply to Lalindra Jayatilleke

Prodigy 150 points

Hello Lali,

Ok. I will beep you.

Is any Bluetooth SDK available for CC5545 ? Like for MSP http://www.ti.com/tool/tibluetoothstack-sdk.

Or at least, a version with source available enough easy to port for x45 dsp ?

Thank you,

Lucian

0 Lalindra Jayatilleke over 9 years ago in reply to Lucian Darie

TI__Mastermind 30365 points

Lucian,

The source code for the OOB demos are posted at www.ti.com/.../sprcae7.
There isn't a BT SDK for the C5545. Please check out the BT source for the CC2650 in the software package.

Regards,

Lali

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C5545 RTC clock out pin - GPIO