I have definitions in *.dtsi file (see below)
pinmux_lpuart2: **pinmux_lpuart2** {
group0 {
pinmux = <&iomuxc_gpio_ad_b1_09_lpuart2_rx>,
<&iomuxc_gpio_ad_b1_08_lpuart2_tx>;
drive-strength = "r0-6";
slew-rate = "slow";
nxp,speed = "100-mhz";
};
};
/* conflicts with user led */
pinmux_lpuart2_sleep: pinmux_lpuart2_sleep {
group0 {
pinmux = <&iomuxc_gpio_ad_b1_09_gpio1_io25>;
drive-strength = "r0-6";
bias-pull-up;
bias-pull-up-value = "100k";
slew-rate = "slow";
nxp,speed = "100-mhz";
};
group1 {
pinmux = <&iomuxc_gpio_ad_b1_08_lpuart2_tx>;
drive-strength = "r0-6";
slew-rate = "slow";
nxp,speed = "100-mhz";
};
};
The binding code fails
const struct device * uart2_dev = device_get_binding("**pinmux_lpuart2**");
if (uart2_dev ==NULL) {
LOG_ERR ("Failed to bind to GPIO device");
}
// configure the LED pin as output
gpio_pin_configure(uart2_dev, UART2_PIN, GPIO_OUTPUT_ACTIVE | GPIO_OPEN_DRAIN | GPIO_ACTIVE_LOW);
gpio_pin_set(uart2_dev, UART2_PIN, GPIO_LOW);
k_msleep(2500); //sleep for 2.5 sec
uart_poll_out (uart2_dev, 0x60) ; // transmit after they got the pin low to get it going
//---------------------------
fd = setup_socket(tty2);
if (fd < 0) {
LOG_ERR("Cannot start UART2 application (%d)", fd);
return;
}
Evidently, "pinmux_lpuart2 is a wrong device to be binding to … What am I doing wrong ?
Thank you!
*************TX: Buffer read returned 0 *********
[00:00:05.514,000] <err> net_socket_can_sample: Failed to bind to GPIO device
[00:00:05.514,000] <err> os: ***** MPU FAULT *****
[00:00:05.514,000] <err> os: Instruction Access Violation
[00:00:05.514,000] <err> os: r0/a1: 0x00000000 r1/a2: 0x00000052 r2/a3: 0x00060007
[00:00:05.514,000] <err> os: r3/a4: 0xffffffff r12/ip: 0x0000158a r14/lr: 0x60004a09
[00:00:05.514,000] <err> os: xpsr: 0x01000000
[00:00:05.514,000] <err> os: Faulting instruction address (r15/pc): 0xfffffffe
[00:00:05.514,000] <err> os: >>> ZEPHYR FATAL ERROR 20: Unknown error on CPU 0
[00:00:05.515,000] <err> os: Current thread: 0x80000a20 (unknown)
[00:00:05.516,000] <err> os: Halting system
