I want to use UART2 to log something. I generated the code using Config Tools for i.MX Applications Processors. Then, on the Linux side, I used picocom -b 115200 /dev/ttymxc1, but ultimately nothing is coming through to the UART.
I also tried using a ready-made working example of hello_world which uses UART4 - that doesn't work either.
The iomuxc node in the .dts file looks approximately like this:
iomuxc {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hog>;
pinctrl_uart1: uart1grp {
fsl,pins = <
MX8MP_IOMUXC_SAI2_TXFS__UART1_DTE_RTS 0x00000106
MX8MP_IOMUXC_UART1_RXD__UART1_DCE_RX 0x00000140
MX8MP_IOMUXC_UART1_TXD__UART1_DCE_TX 0x00000140
>;
};
pinctrl_uart2: uart2grp {
fsl,pins = <
MX8MP_IOMUXC_UART2_RXD__UART2_DCE_RX 0x00000140
MX8MP_IOMUXC_UART2_TXD__UART2_DCE_TX 0x00000140
>;
};
pinctrl_uart3: uart3grp {
fsl,pins = <
MX8MP_IOMUXC_UART3_RXD__UART3_DCE_RX 0x00000140
MX8MP_IOMUXC_UART3_TXD__UART3_DCE_TX 0x00000140
>;
};
pinctrl_uart4: uart4grp {
fsl,pins = <
MX8MP_IOMUXC_ECSPI2_MISO__UART4_DTE_RTS 0x00000106
MX8MP_IOMUXC_ECSPI2_MOSI__UART4_DCE_TX 0x00000140
MX8MP_IOMUXC_ECSPI2_SCLK__UART4_DCE_RX 0x00000140
>;
};
};
Multiplexing code:
void BOARD_InitBootPins(void)
{
IOMUXC_SetPinMux(IOMUXC_UART2_RXD_UART2_RX, 0U);
IOMUXC_SetPinConfig(IOMUXC_UART2_RXD_UART2_RX,
IOMUXC_SW_PAD_CTL_PAD_DSE(2U) |
IOMUXC_SW_PAD_CTL_PAD_PUE_MASK |
IOMUXC_SW_PAD_CTL_PAD_PE_MASK);
IOMUXC_SetPinMux(IOMUXC_UART2_TXD_UART2_TX, 0U);
IOMUXC_SetPinConfig(IOMUXC_UART2_TXD_UART2_TX,
IOMUXC_SW_PAD_CTL_PAD_DSE(2U) |
IOMUXC_SW_PAD_CTL_PAD_PUE_MASK |
IOMUXC_SW_PAD_CTL_PAD_PE_MASK);
}
What could be the problem?
