CRC checks and commands

neopixel-keiran.ino

@@ -40,6 +40,7 @@ void bluetooth_setup(){
   //ble.echo(false); // disable command echo
   //ble.verbose(false); // disable debug info
   ble.sendCommandCheckOK(F("AT+GAPDEVNAME=Suit LEDs")); // Change name displayed in bluetooth scans
+  ble.sendCommandCheckOK(F("AT+HWMODELED=2")); // Show TX/RX activity on LED
   
   //ble.info();
   ble.setConnectCallback(on_connect);
@@ -49,19 +50,61 @@ void bluetooth_setup(){
 }
 
 void on_connect(void){
+  // Status light will go solid blue because of AT+HWMODELED=2
   Serial.println(F("Bluetooth Connected"));
 }
 void on_disconnect(void){
+  // Blue status light will shut off because of AT+HWMODELED=2
   Serial.println(F("Bluetooth Disconnected"));
 }
 
-void BleUartRX(char data[], uint16_t len){
-  Serial.print( F("[RX] " ) );
-  Serial.write(data, len);
-  if (data[0] == 's' && len > 1){
-    setWait(data, len);
+void BleUartRX(char payload[], uint16_t payload_len){
+  // Red status light should flicker because of AT+HWMODELED=2
+  if (payload_len < 3){
+    Serial.print("packet length ");
+    Serial.print(payload_len);
+    Serial.println(" is too short");
+    return;
   }
+  // first byte is the command
+  uint8_t cmd_byte = payload[0];
+  // last byte is the CRC
+  uint8_t crc_byte = payload[payload_len-1];
+  // all other bytes are the data for that command
+  uint16_t data_len = payload_len-2;
+  uint8_t data[data_len];
+  uint16_t payload_index;
+  uint16_t data_index;
+  for (payload_index=1, data_index=0; payload_index<payload_len-1; payload_index++, data_index++){
+    data[data_index] = payload[payload_index];
+  }
+  // Print parts
+  Serial.print(F("[RX] cmd=" ));
+  Serial.print((char)cmd_byte);
+  Serial.print(F(" crc="));
+  Serial.print(crc_byte);
+  Serial.print(F(" data="));
+  Serial.write(data, data_len);
   Serial.println();
+  // check CRC
+  uint8_t crc = 0;
+  for (uint16_t i=0; i<payload_len-1; i++){
+    crc += payload[i];
+  }
+  crc = ~crc;
+  if (crc_byte != crc){
+    Serial.print("CRC mismatch; expected ");
+    Serial.println(crc);
+    return;
+  }
+  // run whichever command was requested
+  if (cmd_byte == 's'){
+    setWait(data, data_len);
+  } else if (cmd_byte == 'p') {
+    setPattern(data, data_len);
+  } else {
+    Serial.println(F("Unrecognized cmd"));
+  }
 }
 
 uint32_t pack_color(uint8_t r, uint8_t g, uint8_t b) {
@@ -81,8 +124,10 @@ class Strip {
 
   public:
   uint16_t wait;
+  char pattern;
 
   Strip(uint8_t led_pin, uint8_t strip_len) {
+    pattern = 'r';
     pin = led_pin;
     num_pixels = strip_len;
     wait = 0;
@@ -91,8 +136,7 @@ class Strip {
     pixel = Adafruit_NeoPixel(num_pixels, pin, NEO_GRBW + NEO_KHZ800);
   }
 
-  public:
-  void off(){
+  void off(void){
     Serial.println(F("off()"));
     pixel.begin();
     for(uint8_t i=0; i<num_pixels; i++){
@@ -102,7 +146,7 @@ class Strip {
   }
 
   private:
-  void rainbow(){
+  void rainbow(void){
     uint8_t r = 255;
     uint8_t g = 0;
     uint8_t b = 0;
@@ -151,7 +195,7 @@ class Strip {
   }
 
   public:
-  void update(){
+  void update(void){
     unsigned long now = millis();
     if (now - wait > last){
       last = now;
@@ -168,12 +212,27 @@ volatile Strip strip = Strip(6, 144);
 
 void setWait(char data[], uint16_t len){
   String wait = "";
-  for (uint16_t index=1; index<len; index++){
+  for (uint16_t index=0; index<len; index++){
     wait += (char)data[index];
   }
   uint16_t wait_int = wait.toInt();
-  if (wait_int >= 0 && wait_int < 10000){
-      strip.wait = wait_int;
+  if (wait_int > -1 && wait_int < 10000){
+    strip.wait = wait_int;
+    Serial.println(F("strip.wait set to "));
+    Serial.print(wait_int);
+  } else {
+    Serial.println(F("Speed is out of the allowed range"));
+  }
+}
+
+void setPattern(char data[], uint16_t len){
+  if (len != 1){
+    Serial.println(F("Invalid pattern"));
+  } else if (data[0] == 'r'){
+    Serial.println(F("pattern set to rainbow"));
+    strip.pattern = 'r';
+  } else {
+    Serial.println(F("Invalid pattern"));
   }
 }