PIN multiplexing and cpu frequency

Sinha S K

Other Parts Discussed in Thread: OMAP-L138

I am using DSP C6748 in ZOOM OMAP-L138 EVM board with OMAP L138 SOM-M1. I want to transmit some data from uart, by 9 pin connector on board. I have following query:

1) Can you tell me how the pin multiplexing will be configured for this application?

2) I also don't know at what frequency my microprocessor is working? How to find it out?

over 12 years ago

0 Rahul Prabhu over 12 years ago

TI__Guru** 116020 points

Hi Sinha,

For the pinmux configuration, we provide a pin mux configuration tool that allows you abilitiy to configure your platform. Please refer to the URL below:

http://www.ti.com/lit/an/sprab63b/sprab63b.pdf

If you are using the GEL file provided by Logic PD, you should have the device configured to run the DSP and ARM at 300Mhz and the mDDR at 133Mhz and the Pinmux settings to use UART on the EVM. Look into the schematics to find an appropriate test point. One point that I came across is pin 61 on J28 with the EMIFA clock pin configured. EMIFA would be the value of the SYSCLK5 which is configured either with DIV5 or DIV4.5(Refer device clocking and PLL controller chapters of the technical reference manual)

You can use the PLL calculator to compute the values of dividers and multipliers to change the configuration of the clocking of the device.

http://processors.wiki.ti.com/index.php/Programming_PLL_Controllers_on_OMAP-L1x8/C674x/AM18xx

If you are working in a non-OS environment. Please take a look at the UART example in the starterware package for the EVM.

http://processors.wiki.ti.com/index.php/StarterWare

Regards,

Rahul

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PIN multiplexing and cpu frequency