UART with KEA8 micro

santhoshkumarsi — Sun, 18 Feb 2018 08:10:24 GMT

We want use UART for serial communication with GPS chip on KEA8 micro,Prot pins PTB0 and PTB1 are assigned for UART as ALT4,do we need to make any specific setting to use ALT4 functionality on port pins.

Thanks in Advance.

Re: UART with KEA8 micro

mjbcswitzerland — Thu, 22 Feb 2018 17:48:14 GMT

KEA8's UART0 is ALT2 on PTB port (not ALT4)

In the uTasker project this is set with:
_CONFIG_PERIPHERAL(B, 0, (PB_0_UART0_RX | UART_PULL_UPS)); // UART0_RX on PB0 (alt. function 2)
_CONFIG_PERIPHERAL(B, 1, (PB_1_UART0_TX | UART_PULL_UPS)); // UART0_TX on PB1 (alt. function 2)

To use the alternative pins on port A instead this would have to be selected with
SIM_PINSEL0 |= (SIM_PINSEL_UART0PS);
and then the pins with

_CONFIG_PERIPHERAL(A, 2, (PA_2_UART0_RX | UART_PULL_UPS)); // UART0_RX on PA2 (alt. function 2)
_CONFIG_PERIPHERAL(A, 3, (PA_3_UART0_TX | UART_PULL_UPS)); // UART0_TX on PA3 (alt. function 2)

Simulation below showing the Rx pin function being checked.

Regards

Mark

Kinetis: http://www.utasker.com/kinetis.html
Kinetis KEA8:
- http://www.utasker.com/kinetis/TRK-KEA8.html
S32 Design Studio: http://www.utasker.com/kinetis/compilers.html#S32

Free Open Source solution: https://github.com/uTasker/uTasker-Kinetis
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