micropython/ports/mimxrt/boards/MIMXRT1050_EVK/pins.csv
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

545 B

1D0GPIO_AD_B1_07
2D1GPIO_AD_B1_06
3D2GPIO_AD_B0_11
4D3GPIO_AD_B1_08
5D4GPIO_AD_B0_09
6D5GPIO_AD_B0_10
7D6GPIO_AD_B1_02
8D7GPIO_AD_B1_03
9D8GPIO_AD_B0_03
10D9GPIO_AD_B0_02
11D10GPIO_SD_B0_01
12D11GPIO_SD_B0_02
13D12GPIO_SD_B0_03
14D13GPIO_SD_B0_00
15D14GPIO_AD_B1_01
16D15GPIO_AD_B1_00
17A0GPIO_AD_B1_10
18A1GPIO_AD_B1_11
19A2GPIO_AD_B1_04
20A3GPIO_AD_B1_05
21A4GPIO_AD_B1_01
22A5GPIO_AD_B1_00
23RXGPIO_AD_B1_07
24TXGPIO_AD_B1_06
25SCLGPIO_AD_B1_00
26SDAGPIO_AD_B1_01
27SCKGPIO_SD_B0_00
28SDIGPIO_SD_B0_03
29SDOGPIO_SD_B0_02
30CSGPIO_SD_B0_01
31LED_GREENGPIO_AD_B0_09