Example MPC5777C-SDADC_eTPU_triggered GHS714

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* Detailed Description:
* Example configures Sigma_Delta ADC and periodically converts ANA0_SDA0 input
* (EVB's potentiometer can be connected i.e. J53-1 --> PO15) and displays
* results in the terminal window (USBtoUART bridge J21). Terminal settings is
* 19200-8-no parity-1 stop bit-no flow control on eSCI_A.
* Example uses external ADC triggering from eTPU channels, that are for purpose
* of this example configured for eTPU GPIO function for all eTPU channels that
* can trigger start of SDADC conversion.
*
* ------------------------------------------------------------------------------
* Test HW:         MPC5777C-512DS Rev.A + MPC57xx MOTHER BOARD Rev.C
* MCU:             PPC5777CMM03 2N45H CTZZS1521A
* Fsys:            PLL1 = core_clk = 264MHz, PLL0 = 192MHz
* Debugger:        Lauterbach Trace32
* Target:          internal_FLASH
* Terminal:        19200-8-no parity-1 stop bit-no flow control on eSCI_A
*                  eSCI_A is USBtoUART bridge (connector J21)
* EVB connection:  For ADC: J53-1 (EVB pot's wiper) --> PO15 (header P22)
*
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