Neopixel的系列问题
Posted
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Neopixel的系列问题相关的知识,希望对你有一定的参考价值。
我正在寻找一些帮助;了解DMA,串行,管理中断和阻塞代码。
我有一个ESP32 DEVKITC v4,用于处理来自旋转编码器等硬件和wifi的用户输入。 ESP32还负责驱动20x4 LCD来显示菜单,供用户进行交互。
然后我有一个Teensy 3.5处理像素驱动。它负责生成像素帧,将其加载到缓冲区并输出信号。我正在运行Adafruit Neopixel Library的修改版来控制我的TM1814 LED。
目前,我遇到的麻烦是ESP32与Teensy之间的通信。新像素的代码需要阻塞,以便正确确定LED驱动器IC的时序。当ESP具有用于旋转编码器的中断以保持准确的计数时,这两种混乱都与串行通信有关。到目前为止,这是我的测试代码,它是最终项目代码的简化版本,可让您轻松识别问题并帮助缓慢构建复杂性。
ESP_Transmitter
#include <Rotary.h>
#define RTS_PIN 5
int previousArray;
int previousRGBW;
#define inPinA 35
//rotary acceleration variables
int rotaryTime;
volatile int counterA;
volatile int counterB;
byte enableAcceleration;
bool lockFlag = false;
Rotary rotaryA = Rotary(32, 33);
//teensy is expecting data <rgbwArrayToTeensy,rgbwToTeensy>
typedef struct ESPtransmit_t
char startMarker;
int rgbwArrayToTeensy;
char comma;
int rgbwToTeensy;
char endMarker;
;
typedef union Channel_Packet_t
ESPtransmit_t rgbwLED;
byte ChannelPacket[sizeof(ESPtransmit_t)];
;
Channel_Packet_t blueOn;
void setup()
Serial.begin(9600);
Serial2.begin(115200, SERIAL_8N1, 16, 17);
while (!Serial);
while (!Serial2);
pinMode(RTS_PIN, INPUT);
attachInterrupt(digitalPinToInterrupt(RTS_PIN), Transmit_Data, RISING);
attachInterrupt(digitalPinToInterrupt(32), rotateA, CHANGE);
attachInterrupt(digitalPinToInterrupt(33), rotateA, CHANGE);
void loop()
blueOn.rgbwLED = '<', 2, ',', counterA, '>';
void Transmit_Data()
noInterrupts();
if (previousRGBW != blueOn.rgbwLED.rgbwToTeensy)
Serial2.write(blueOn.ChannelPacket, sizeof(ESPtransmit_t));
Serial.println("send");
previousRGBW = blueOn.rgbwLED.rgbwToTeensy;
interrupts();
void rotateA()
int speedMultiplier = 1;
unsigned char result = rotaryA.process();
if (lockFlag == false)
if (result == DIR_CW)
if (millis() - rotaryTime <= 10 && enableAcceleration == 0x01)
speedMultiplier = 7;
else if (digitalRead(inPinA) == HIGH)
speedMultiplier = 700;
counterA += speedMultiplier;
rotaryTime = millis();
else if (result == DIR_CCW)
if (millis() - rotaryTime <= 10 && enableAcceleration == 0x01)
speedMultiplier = 7;
else if (digitalRead(inPinA) == HIGH)
speedMultiplier = 700;
counterA -= speedMultiplier;
rotaryTime = millis();
TEENSY3.5_RECEIVER
// include the library code:
#include <Adafruit_NeoPixel.h>
//number of LEDs in Strip
int NUM_LEDS = 52;
//data and clock pin RGB
#define DATA_PINA 11
#define RTR_PIN 28
uint32_t amp = ((uint32_t)63 << 24) | ((uint32_t)63 << 16) | ((uint32_t)63 << 8) | 63;
Adafruit_NeoPixel pixelsA(NUM_LEDS, DATA_PINA, NEO_WRGB + NEO_KHZ800);
struct Received_Data_t
char startMarker;
int rgbwArrayFromESP;
char comma;
int rgbwFromESP;
char endMarker;
;
union Channel_Packet_t
Received_Data_t rgbwLED;
byte ChannelPacket[sizeof(Received_Data_t)];
;
Channel_Packet_t LEDon;
//apeture controls
int apeture = NUM_LEDS;
int apeturePosition = NUM_LEDS / 2;
//RGB Sub Menu Variables
int rgbArraySelector;
uint8_t subRed;
uint8_t subGreen;
uint8_t subBlue;
uint8_t subWhite;
uint8_t rgbwArray [] = subRed, subGreen, subBlue, subWhite;
const byte numChars = sizeof(Received_Data_t);
char receivedChars[numChars];
int rgbwFromESP = 0;
boolean newData = false;
void setup()
Serial1.setTX(26);
Serial1.setRX(27);
Serial1.begin(115200);
Serial.begin(9600);
while (!Serial);
while (!Serial1);
pixelsA.begin(); // INITIALIZE NeoPixel strip object
//clear the LEDS
pixelsA.fill(amp, ~amp, pixelsA.Color(0, 0, 0, 0), 0, NUM_LEDS);
pixelsA.show();
pinMode(RTR_PIN, OUTPUT);
digitalWrite(RTR_PIN, LOW);
void loop()
Read_to_Receive(); //activate transmission
recvWithStartEndMarkers(); //read buffer
if (newData == true)
parseData();
showParsedData();
newData = false;
void LED_clear()
pixelsA.fill(amp, ~amp, pixelsA.Color(0, 0, 0, 0), 0, NUM_LEDS);
pixelsA.show();
void LED_RGBW()
pixelsA.fill(amp, ~amp, pixelsA.Color(0, 0, 0, 0), 0, NUM_LEDS);
pixelsA.fill(amp, ~amp, pixelsA.Color(rgbwArray[0], rgbwArray[1], rgbwArray[2], rgbwArray[3]), apeturePosition, apeture / 2);
pixelsA.fill(amp, ~amp, pixelsA.Color(rgbwArray[0], rgbwArray[1], rgbwArray[2], rgbwArray[3]), apeturePosition - (apeture / 2), apeture / 2);
pixelsA.show();
void recvWithStartEndMarkers()
static boolean recvInProgress = false;
static byte ndx = 0;
char startMarker = '<';
char endMarker = '>';
char rc;
while (Serial1.available() > 0 && newData == false)
rc = Serial1.read();
if (recvInProgress == true)
if (rc != endMarker)
receivedChars[ndx] = rc;
ndx++;
if (ndx >= numChars)
ndx = numChars - 1;
else
receivedChars[ndx] = rc; // terminate the string
recvInProgress = false;
ndx = 0;
newData = true;
else if (rc == startMarker)
receivedChars[ndx] = rc;
ndx++;
recvInProgress = true;
//============
void Read_to_Receive()
pixelsA.fill(amp, ~amp, pixelsA.Color(0, 0, 0, 0), 0, NUM_LEDS);
pixelsA.fill(amp, ~amp, pixelsA.Color(rgbwArray[0], rgbwArray[1], rgbwArray[2], rgbwArray[3]), apeturePosition, apeture / 2);
pixelsA.fill(amp, ~amp, pixelsA.Color(rgbwArray[0], rgbwArray[1], rgbwArray[2], rgbwArray[3]), apeturePosition - (apeture / 2), apeture / 2);
digitalWrite(RTR_PIN, LOW);
pixelsA.show();
digitalWrite(RTR_PIN, HIGH);
//wait for ESP to transmit
delay(1);
//============
void parseData() // split the data into its parts
for (uint8_t k = 0; k < sizeof(Received_Data_t); k++)
LEDon.ChannelPacket[k] = receivedChars[k];
rgbArraySelector = LEDon.rgbwLED.rgbwArrayFromESP;
rgbwFromESP = LEDon.rgbwLED.rgbwFromESP;
rgbwArray[rgbArraySelector] = rgbwFromESP;
//============
void showParsedData()
Serial.print("Array ");
Serial.println(rgbArraySelector);
Serial.print("Intensity ");
Serial.println(rgbwFromESP);
尽管此代码大部分有效,但在快速转动编码器时,我仍然在传输中遇到错误。这就是我希望DMA可以解决的地方。如果我正确理解DMA,则可以使用它和uart(串行)在两个MCU之间发送数据,而忽略阻塞代码和中断。然后在主循环中轮询DMA缓冲区并解析接收到的数据,但是我找不到使用DMA和Uart的可靠示例。有谁知道这是否行得通,如果有的话,您可以链接一些示例让我签出吗?
我更希望找到一个软件解决方案,但作为硬件解决方案,我还希望使用this或两个MCU都可以访问的外部SRAM。在适当时充当缓冲区存储用户生成的要轮询的变量。
我对所有这一切还很陌生,因此欢迎进一步提出任何问题,我想知道人们对此的想法。
目前,我遇到的麻烦是ESP32与Teensy之间的通信。
如果串行链接的两端都有问题,则应尝试简化测试设置以减少变量/未知数。使用ESP32传输数据,然后尝试使用终端或捕获程序(在PC上)验证该数据。或将罐装数据从PC传输到Teensy 3.5,然后分析响应。
尽管此代码大部分有效,但在快速转动编码器时,我仍然在传输中遇到错误。
我在您的ESP_Transmitter代码中发现了一个问题,该代码在[[Transmit_Data()过程中:
void Transmit_Data()
noInterrupts();
if (previousRGBW != blueOn.rgbwLED.rgbwToTeensy)
Serial2.write(blueOn.ChannelPacket, sizeof(ESPtransmit_t));
Serial.println("send");
previousRGBW = blueOn.rgbwLED.rgbwToTeensy;
interrupts();
在禁用中断的情况下执行I / O请求是有问题的。通常,您总是希望尽量减少禁用中断所花费的时间。实际上,我对Arduino一无所知,但是...看起来
previousRGBW
和/或blueOn
是必须保护的关键区域,并且串行填充可以在此代码段之外执行。要保护blueOn
,只需复制blueOn.ChannelPacket
即可进行串行传输。如下所示应该有所改进:
byte xmitPacket[sizeof(ESPtransmit_t)]; void Transmit_Data() noInterrupts(); if (previousRGBW != blueOn.rgbwLED.rgbwToTeensy) memcpy(xmitPacket, blueOn.ChannelPacket, sizeof(ESPtransmit_t)); previousRGBW = blueOn.rgbwLED.rgbwToTeensy; interrupts(); Serial2.write(xmitPacket, sizeof(ESPtransmit_t)); Serial.println("send"); else interrupts();
以上是关于Neopixel的系列问题的主要内容,如果未能解决你的问题,请参考以下文章
ATtiny85 + Adafruit_NeoPixel 不适用于数组