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我正在家庭自動化系統上，包括阿爾杜伊諾Mega2560通過USB連接到一個樹莓派3模型B。 Arduino通過Pi的串行接收兩個簡短的命令;第一個命令設置led燈的「區域」，第二個命令設置前面所述區域的顏色。兩個命令的語法如下，其中括號內的項目是單個字節，len + off是3個ascii字節解釋爲base-10，r + g + b是2個ascii字節，每個解釋爲十六進制。顏色設置命令支持如圖所示的區域的可變數目：通過串行訪問時，Arduino全局數組未被修改？一個其中一部分
地區設置命令
!c[regionId][stripId][len2][len1][len0][off2][off1][off0]\r
顏色設置命令
!b[r1][r0][g1][g0][b1][b0][numRegions][regionId0]([regionId1]...)\r
每一個指令發送正/負確認，所以你會覺得我能夠告訴發生了什麼問題，但是當我嘗試使用第二個命令設置淺色時，我會發現意外的行爲，但是，儘管得到了預期的確認。 到目前爲止，我可以得出的唯一合理結論是，對於全球陣列區域丟棄更改並始終保持爲零。例如，在沒有燈光這種交換的結果亮起（註釋都沒有在實際的交換）
Pi sends: !c00144000\r // create regionId 0 on stripId 0; length 144 offset 0
Pi recieves: O // positive confirmation?
Pi sends: !b00009910\r // set regionId 0 to color 0x000099 (blue)
Pi recieves: O // positive confirmation, but no lights?
Pi sends: !x\r // invalid command; triggers default in switch
Pi recieves: X // as expected, all lights turn red
下面是Arduino的剝離下來來源：
#include "Arduino.h"
#include "FastLED.h"
#define WAIT while(!Serial.available()) ;;
// Forward Declarations
const int max_strips = 2;
const int max_strip_length = 300;
const int max_leds = max_strips * max_strip_length;
CRGB leds[max_strips][max_strip_length];
const int max_regions = 20;
int regions[max_regions][3];
const int baud_rate = 9600;
unsigned char buffer[64];
unsigned char currentByte = 0;
unsigned char incommingByte;
unsigned char startChar = '!';
unsigned char endChar = '\r';
bool store = false;
// Helper Functions
void set(CRGB c) {
for(int i = 0; i < max_strips; i++) {
for(int j = 0; j < max_strip_length; j++) {
leds[i][j] = c;
}
}
}
void set(int stripId, int length, int offset, CRGB c) {
for(int i = offset; i < offset+length; i++) {
leds[stripId][i] = c;
}
}
void setup() {
Serial.begin(baud_rate);
for(int i = 0; i < max_strips; i++) {
switch(i) {
case 0: {
FastLED.addLeds<WS2812B, 2, GRB>(leds[0], max_strip_length);
} break;
case 1: {
FastLED.addLeds<WS2812B, 3, GRB>(leds[1], max_strip_length);
} break;
}
}
set(CRGB::Black);
}
void loop() {
if(Serial.available() > 0) {
unsigned char incomingByte = Serial.read();
if(incomingByte == startChar) {
currentByte = 0;
store = true;
}
if(store) {
if(incomingByte == endChar) {
buffer[currentByte++] = incomingByte;
store = false;
switch(buffer[1]) {
case 'b': {
int red = (buffer[2] - '0')*16 + (buffer[3] - '0');
int green = (buffer[4] - '0')*16 + (buffer[5] - '0');
int blue = (buffer[6] - '0')*16 + (buffer[7] - '0');
int numRegions = buffer[8] - '0';
for(int i = 0; i < numRegions; i++) {
int regionId = buffer[9+i] - '0';
if(regionId >= max_regions) {
Serial.write('S');
return;
}
// Never sets anything
set(regions[regionId][0], regions[regionId][1], regions[regionId][2], CRGB(red, green, blue));
}
Serial.write('O');
} break;
case 'c': {
int regionId = buffer[2] - '0';
int stripId = buffer[3] - '0';
int length = (buffer[4] - '0')*100 + (buffer[5] - '0')*10 + (buffer[6] -'0');
int offset = (buffer[7] - '0')*100 + (buffer[8] - '0')*10 + (buffer[9] -'0');
if(regionId >= max_regions) {
Serial.write('R');
return;
}
if(stripId >= max_strips) {
Serial.write('S');
return;
}
regions[regionId][0] = stripId; // WE LOSE THESE VALUES??
regions[regionId][1] = length; // ??
regions[regionId][2] = offset; // ??
Serial.write('O');
} break;
default: {
set(CRGB::Red);
Serial.write('X');
} break;
}
currentByte = 0;
}else if(currentByte > 64){
store = false;
currentByte = 0;
} else {
buffer[currentByte++] = incomingByte;
}
}
}
FastLED.show();
}
我會很感激任何意見，到我在這裏想念的東西，無論如何，感謝您閱讀這些！