我一直在开发一个伪随机生成祈使句的程序。该程序将随机选择的动词、所有格形容词和名词组合在一起,以显示最后一句话。我最近一直在尝试将代码从Processing翻译成Arduino,今天我遇到了一些奇怪的行为。这是我迄今为止的代码:
#include <SD.h>
int ByteReceived;
int stepToLoad = 1;
int endOfLineNumber = 0;
int stringIndex = 0;
int fileNumber = 0;
File configFile;
char inputString [20];
char inputChar;
String file [3] = {
"verb.txt","adject.txt","noun.txt"};
void setup() {
Serial.begin(9600);
char randSteps[3] = {
random(1,1041),random(1,7),random(1,979)};
pinMode(10, OUTPUT);
SD.begin(10);
for(fileNumber = 0; fileNumber < 3; fileNumber++){
char filename[file[fileNumber].length()+1];
file[fileNumber].toCharArray(filename, sizeof(filename));
if(!SD.exists('''+filename+'''))
{
stepToLoad = randSteps[fileNumber];
configFile = SD.open(filename);
getStepData();
Serial.print(inputString);
Serial.print(" ");
endOfLineNumber = 0;
stringIndex = 0;
inputString[0] = ' ';
configFile.close();
}
}
}
void loop() {
if (Serial.available() > 0)
{
ByteReceived = Serial.read();
if(ByteReceived == '1')
{
setup();
}
}
}
void getStepData(){
if (configFile) {
while (configFile.available()) {
inputChar = configFile.read();
if (inputChar != ' '){
inputString[stringIndex] = inputChar;
stringIndex++;
}
else {
endOfLineNumber++;
if (endOfLineNumber == stepToLoad){
inputString[stringIndex] = ' ';
break;
}
else {
stringIndex = 0;
}
}
}
}
}
我目前正在实现一些神奇的数字来代替文本文件的最大字数:char randSteps[3] = {random(1,1041/*Total words in verb.txt*/),random(1,7/*Total words in adject.txt*/),random(1,979/*total words in noun.txt*/)};
这只是为了在调试代码时加快启动时间。至于奇怪的行为,程序有时会打印一个完整的短语,比如:
"abide my arithmetic"
其他时候它会打印一些类似的东西:
"1oomylenddotde his 1oopergesstive"
这种行为可以只影响动词,也可以只影响名词,或者两者兼而有之。当它影响动词时,它总是读作"1oomylenddotde",当它影响名词时,它读作"1 operatgesstive"。只有当我强迫程序尝试阅读超过文本文件中的单词总数时,所有格形容词才会生效:char randSteps[3] = {1,9,1};
这时形容词读作"1海"。然而,当程序试图读取"verb.txt"或"noon.txt"上过去的200个单词时,问题通常会出现:char randSteps[3] = {200,1,200};
尽管我在"verb.txt"one_answers"noon.txt"中有200多个单词。这与SRAM有关吗,与endOfLineNumber
的大小有关吗,还是与某种缓冲区有关?
经过一些必要的休息,我发现了这个问题。我将随机整数存储为字符值。
char randSteps[3] = {
random(1,1041),random(1,7),random(1,979)};
我现在已将其更改为:
int randSteps[3] = {
random(1,1041),random(1,7),random(1,979)};
真傻。这是工作代码:
#include <SD.h>
int ByteReceived;
int stepToLoad = 1;
int endOfLineNumber = 0;
int stringIndex = 0;
int fileNumber = 0;
File configFile;
char inputString [20];
char inputChar;
String file [3] = {
"verb.txt","adject.txt","noun.txt"};
void setup() {
Serial.begin(9600);
pinMode(10, OUTPUT);
SD.begin(10);
int randSteps[3] = {random(1,1041),random(1,7),random(1,979)};
for(fileNumber = 0; fileNumber < 3; fileNumber++){
char filename[file[fileNumber].length()+1];
file[fileNumber].toCharArray(filename, sizeof(filename));
if(!SD.exists('''+filename+'''))
{
stepToLoad = randSteps[fileNumber];
configFile = SD.open(filename);
getStepData();
Serial.print(inputString);
Serial.print(" ");
stringIndex = 0;
endOfLineNumber = 0;
inputString[0] = ' ';
configFile.close();
}
}
}
void loop() {
if (Serial.available() > 0)
{
ByteReceived = Serial.read();
if(ByteReceived == '1')
{
setup();
}
}
}
void getStepData(){
if (configFile) {
while (configFile.available()) {
inputChar = configFile.read();
if (inputChar != ' '){
inputString[stringIndex] = inputChar;
stringIndex++;
}
else {
endOfLineNumber++;
if (endOfLineNumber == stepToLoad){
inputString[stringIndex] = ' ';
break;
}
else {
stringIndex = 0;
}
}
}
}
}