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Author SHA1 Message Date
robert-hh 689476c576 mimxrt/machine_uart: Add the UART class to the machine module. 
The implementation uses the LPUARTx devices.  Up to 8 UARTs can be used,
given that the pins are accessible.  E.g. 8 on Teensy 4.1, 5 on
MIMXRT1020_EVK.

For Tennsy 4.0 and 4.1 the UART numbers are as printed on the pinout 1..N.
The MIMXRT10xx-EVK boards have only one UART named, which gets the number
1.  All other UART are assigned to different Pins:

MIMXRT1010-EVK:
    D0/D1   UART 1
    D6/D7   UART 2
    A0/D4   UART 3

MIMXRT1020-EVK:
    D0/D1   UART 1
    D6/D9   UART 2
    D10/D12 UART 3
    D14/D15 UART 4
    A0/A1   UART 5

MIMXRT1050-EVK, MIMXRT1060-EVK, MIMXRT1064-EVK:
    D0/D1   UART 1
    D7/D6   UART 2
    D8/D9   UART 3
    A1/A0   UART 4
 2021-06-16 01:21:15 +10:00
robert-hh 53fea8598e mimxrt/boards: Add board configuration files for Teensy 4.1. 
These are at the moment more or less identical to the Teensy 4.0 files,
except for the pins.csv file and the flash size.
 2021-06-04 01:00:39 +10:00