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labW4barnestr/Src/main.c

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+/*
+ * main.c
+ *	CE2812
+ *  Created on: January 7, 2022
+ *  Author: Trevor Barnes
+ *  Description: This program allows a user to interact with different memory operations through
+ *  a terminal connected to the serial port. Different operations include: reading memory at a
+ *  given address, writing an in value to a given address, and providing a memory dump of a certain
+ *  byte length at a given memory address.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "uart_driver.h"
+#include "led.h"
+#include "delay.h"
+
+#define F_CPU 16000000UL
+
+/**
+ * Reads and prints the memory value at address provided: "addr"
+ */
+void readMem(uint32_t addr) {
+	// Assign and casts a new int pointer the value of addr
+	uint32_t * memPtr = (uint32_t *)addr;
+	// Formatted print with both hex and decimal values
+	printf("Memory Value at %#08x\n\r"
+		   "Hex: %#08x\n\r"
+		   "Decimal: %d\n\r", addr, *memPtr, *memPtr);
+	return;
+}
+/**
+ * Writes the provided "data" value as an unsigned 32-bit word at the provided address: "addr"
+ */
+void writeMem(uint32_t addr, uint32_t data) {
+	// Assign and casts a new int pointer the value of addr
+	uint32_t * memPtr = (uint32_t *)addr;
+	// Write data
+	*memPtr = data;
+	// Confirmation printout showing the new value and address
+	printf("Value written at  %#08x: %u \n\r", addr, data);
+	return;
+}
+
+/**
+ * Prints out formatted, hexadecimal memory values in "byte-sized" chunks starting at the provided
+ * memory address: "addr". The length of the memory dump is provided by "length".
+ */
+void dumpMem(uint32_t addr, int length) {
+	// Set length to default value if length is negative
+	// (No limit or protection for large, overflow values yet)
+	if(length <= 0) {
+		length = 16;
+		printf("Length set to default! (16)\n\r");
+	}
+	// Assign and casts a new int pointer the value of addr
+	uint8_t * memPtr = (uint8_t *)addr;
+	// Loop that executes each read and print operation
+	for(int i=0 ; i < length ; i++) {
+		// Print newline and memory location every 16 bytes
+		if((i % 16) == 0) {
+			printf("\n\r%p:", memPtr);
+		}
+		// Print each byte
+		printf(" %02X", *memPtr);
+		// Iterate pointer to next byte
+		memPtr++;
+		}
+	printf("\n\r");
+	return;
+}
+
+/**
+ * Prints a help dialog that provides the user the list of available commands
+ */
+void printHelp() {
+	printf("*Commands*\n\r");
+	printf("'rmw {hex address}' - Reads mem at a given address\n\r");
+	printf("'wmw {hex address} {value}' - Writes the given value as a word to the given address\n\r");
+	printf("'dm {hex address} {length}' - Dumps the memory at a given address. Defaults to 16 B if no "
+			"length is given\n\r");
+}
+
+/**
+ * Main function that handles usart/led initialization and command input/parsing from the user
+ */
+int main(void) {
+	init_usart2(57600,F_CPU);
+	led_init();
+	char line[50];
+	char command[10];
+	uint32_t address;
+	uint32_t data;
+	int length;
+	for(;;) {
+		// Get command from user
+		fgets(line, 100, stdin);
+		// Parse only the command for strcmp
+		sscanf(line, "%s", command);
+		if (!strcmp(command, "help")) {
+			printHelp();
+		} else if (!strcmp(command,"rmw")) {
+			// Parse line again with expected format and values
+			sscanf(line, "%s %X", command, &address);
+			//printf("Command: %s Address: %x\n\r", command, address);
+			readMem(address);
+		} else if (!strcmp(command, "wmw")) {
+			// Parse line again with expected format and values
+			sscanf(line, "%s %X %u", command, &address, &data);
+			//printf("Command: %s Address: %x Data: %u\n\r", command, address, data);
+			writeMem(address, data);
+		} else if (!strcmp(command, "dm")) {
+			// Parse line again with expected format and values
+			sscanf(line, "%s %X %u", command, &address, &length);
+			//printf("Command: %s Address: %x Length: %d\n\r", command, address, length);
+			dumpMem(address, length);
+		} else {
+			printf("Invalid input, type 'help' for instructions\n\r");
+		}
+	}
+}