feat: unoq: add can support

Add FDCAN on pins 4/5. Tested with code from zephyrproject-rtos/zephyr#94973
Need to integrate with RPC subsystem and a mix of slcan and socat

Author: facchinm

loader/llext_exports.c

@@ -60,6 +60,9 @@ EXPORT_SYMBOL(sqrtf);
 EXPORT_SYMBOL(k_sched_lock);
 EXPORT_SYMBOL(k_sched_unlock);
 
+EXPORT_SYMBOL(bin2hex);
+EXPORT_SYMBOL(hex2bin);
+
 #if defined(CONFIG_USB_DEVICE_STACK)
 EXPORT_SYMBOL(usb_enable);
 EXPORT_SYMBOL(usb_disable);
@@ -308,3 +311,7 @@ FORCE_EXPORT_SYM(fs_mkfs);
 FORCE_EXPORT_SYM(fs_register);
 FORCE_EXPORT_SYM(fs_unregister);
 #endif
+
+#if defined(CONFIG_CAN)
+#include <zephyr/drivers/can.h>
+#endif

variants/arduino_uno_q_stm32u585xx/arduino_uno_q_stm32u585xx.conf

@@ -37,6 +37,12 @@ CONFIG_DYNAMIC_THREAD=y
 CONFIG_DYNAMIC_THREAD_POOL_SIZE=2
 CONFIG_DYNAMIC_THREAD_ALLOC=y
 
+CONFIG_CAN=y
+CONFIG_CAN_FD_MODE=y
+CONFIG_CAN_MAX_FILTER=8
+CONFIG_CAN_ACCEPT_RTR=y
+CONFIG_CAN_STM32_FDCAN=y
+
 #CONFIG_VIDEO=y
 #CONFIG_VIDEO_LOG_LEVEL_DBG=y
 #CONFIG_VIDEO_STM32_DCMI=y

variants/arduino_uno_q_stm32u585xx/arduino_uno_q_stm32u585xx.overlay

@@ -1,3 +1,9 @@
+/{
+	chosen {
+		zephyr,canbus = &fdcan1;
+	};
+};
+
 &i2c4 {
 	status = "okay";
 	pinctrl-0 = <&i2c4_scl_pd12 &i2c4_sda_pd13>;
@@ -22,6 +28,12 @@
 */
 };
 
+&fdcan1 {
+	pinctrl-0 = <&fdcan1_rx_pa11 &fdcan1_tx_pa12>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
 /* clock from HSI48 */
 &mco1 {
 	status = "okay";