Create CAN helper functions

Get / Set CAN filter ID
Get / Set CAN filter mask
Get latest valid CAN frame in `can_frame` struct

demo/Makefile

@@ -3,7 +3,7 @@ BUILD_DIR?=../build/
 include $(BUILD_DIR)/software/include/generated/variables.mak
 include $(SOC_DIRECTORY)/software/common.mak
 
-OBJECTS = crt0.o donut.o led.o main.o note.o
+OBJECTS = can.o crt0.o donut.o led.o main.o note.o
 CFLAGS += -DWITH_CXX
 
 

demo/can

@@ -0,0 +1,23 @@
+#include <generated/csr.h>
+#include <stdint.h>
+
+#pragma once
+
+// Struct Definition
+
+struct can_frame {
+	uint16_t id;
+	uint8_t data[8];
+};
+
+// Function Declarations
+
+uint32_t can_id_read(void);
+
+void can_id_write(uint32_t value);
+
+uint32_t can_mask_read(void);
+
+void can_mask_write(uint32_t value);
+
+can_frame can_read(void);

demo/can.cpp

@@ -0,0 +1,35 @@
+#include "can"
+#include <generated/csr.h>
+#include <stdint.h>
+
+#ifdef CSR_CAN_BASE
+uint32_t can_id_read(void) {
+	return can_can_id_read();
+}
+
+void can_id_write(uint32_t value) {
+	can_can_id_write(value);
+}
+
+uint32_t can_mask_read(void) {
+	return can_id_mask_read();
+}
+
+void can_mask_write(uint32_t value) {
+	can_id_mask_write(value);
+}
+
+can_frame can_read(void) {
+	can_frame frame;
+	frame.id = can_can_id_read();
+	frame.data[0] = can_rcv_data0_read();
+	frame.data[1] = can_rcv_data1_read();
+	frame.data[2] = can_rcv_data2_read();
+	frame.data[3] = can_rcv_data3_read();
+	frame.data[4] = can_rcv_data4_read();
+	frame.data[5] = can_rcv_data5_read();
+	frame.data[6] = can_rcv_data6_read();
+	frame.data[7] = can_rcv_data7_read();
+	return frame;
+}
+#endif