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boards: mimxrt1020_evk: Enable lpuart2 for bluetooth hci

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Enables instance 2 of the lpuart driver and configures pinmuxes to use
bluetooth hci on the mimxrt1020_evk board. Updates board documentation
accordingly.

Tested with samples/bluetooth/peripheral_hr, with frdm_kw41z attached as
an arduino shield running the nxp hci controller application.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
This commit is contained in:
Maureen Helm 2019-01-14 15:14:37 -06:00
commit 2ec2ac16d5
4 changed files with 27 additions and 1 deletions
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3
boards/arm/mimxrt1020_evk/Kconfig.defconfig
View file

@ -25,6 +25,9 @@ if UART_MCUX_LPUART
config UART_MCUX_LPUART_1
default y
config UART_MCUX_LPUART_2
default y if BT_UART
endif # UART_MCUX_LPUART
endif # BOARD_MIMXRT1020_EVK

7
boards/arm/mimxrt1020_evk/doc/mimxrt1020_evk.rst
View file

@ -98,6 +98,10 @@ The MIMXRT1020 SoC has five pairs of pinmux/gpio controllers.
+---------------+-----------------+---------------------------+
| GPIO_AD_B0_07 | LPUART1_RX | UART Console |
+---------------+-----------------+---------------------------+
| GPIO_AD_B1_08 | LPUART2_TX | UART BT HCI |
+---------------+-----------------+---------------------------+
| GPIO_AD_B1_09 | LPUART2_RX | UART BT HCI |
+---------------+-----------------+---------------------------+
| WAKEUP | GPIO | SW0 |
+---------------+-----------------+---------------------------+
@ -110,7 +114,8 @@ board with the on-chip PLL to generate a 500 MHz core clock.
Serial Port
===========
The MIMXRT1020 SoC has eight UARTs. One is configured for the console and the
The MIMXRT1020 SoC has eight UARTs. ``LPUART1`` is configured for the console,
``LPUART2`` for the Bluetooth Host Controller Interface (BT HCI), and the
remaining are not used.
Programming and Debugging

2
boards/arm/mimxrt1020_evk/mimxrt1020_evk.dts
View file

@ -57,6 +57,8 @@
};
};
arduino_serial: &uart2 {};
&flexspi0 {
reg = <0x402a8000 0x4000>, <0x60000000 0x800000>;
is25wp064: is25wp064@0 {

16
boards/arm/mimxrt1020_evk/pinmux.c
View file

@ -41,6 +41,22 @@ static int mimxrt1020_evk_init(struct device *dev)
IOMUXC_SW_PAD_CTL_PAD_DSE(6));
#endif
#ifdef CONFIG_UART_MCUX_LPUART_2
/* LPUART2 TX/RX */
IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_08_LPUART2_TX, 0);
IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_09_LPUART2_RX, 0);
IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_08_LPUART2_TX,
IOMUXC_SW_PAD_CTL_PAD_PKE_MASK |
IOMUXC_SW_PAD_CTL_PAD_SPEED(2) |
IOMUXC_SW_PAD_CTL_PAD_DSE(6));
IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_09_LPUART2_RX,
IOMUXC_SW_PAD_CTL_PAD_PKE_MASK |
IOMUXC_SW_PAD_CTL_PAD_SPEED(2) |
IOMUXC_SW_PAD_CTL_PAD_DSE(6));
#endif
return 0;
}