Can somebody help to explain why my code or setup not updating the ADC values of a 10K-potentiometer please?
I use MPLAB XPRESS PIC16F18877 board and MPLAB MCC to generate the code. The voltage result only gets updated once after resetting the board.
main.c
#include "mcc_generated_files/mcc.h"
void display_result(float v);
void main(void) {
adc_result_t convResult = 0;
float v = 0;
// initialize the device
SYSTEM_Initialize();
ADCC_StartConversion(POT);
while (1) {
// Convert ADC values
while (!ADCC_IsConversionDone());
convResult = ADCC_GetConversionResult();
v = convResult * 3.3 / 1023;
// send the value to display
display_result(v);
}
}
void display_result(float v) {
if (v > 1.65) {
LED_SetHigh();
} else {
LED_SetLow();
}
}
This question is solved by calling
ADCC_StartConversion(POT);
in the while(1) loop.
Related
Currently I am having issues with a program running a freertos program. The purpose of the program is to control a stepper motor as well as an led. Implementing the motor control without microstepping does not have any issues as the two tasks take no parameters and call no functions.
However, when I introduce microstepping which requires two nested functions to be called by the move_routine task, the program will not do anything (no led flashing, no motor turning) when it did before. Does anyone have any solutions for this or any reasons on why this shouldn't work? From what I can see it should be fine to call a function from a freertos task.
#include <Arduino.h>
#include <Stepper.h>
/*================PIN DEFINITIONS================*/
#define LEDC_CHANNEL_0 0
#define LEDC_CHANNEL_1 1
#define LEDC_CHANNEL_2 2
#define LEDC_CHANNEL_3 3
const int A1A = 14;
const int A1B = 27;
const int B1A = 26;
const int B2A = 25;
const int ledPin = 33;
/*================VARIABLE DEFINITIONS================*/
int stepnumber = 0;
int Pa; int Pb;
const int stepsPerRev = 200;
Stepper myStepper(stepsPerRev, 14,27,26,25);
/*================Function Definitions================*/
//Analogwrite using LEDC capabilities
void ledcAnalogWrite(uint8_t channel, uint32_t value, uint32_t valueMax = 255) {
//calculation of duty cycle
uint32_t duty = (4095/valueMax)*min(value, valueMax);
ledcWrite(channel,duty);
}
void move(int stepnumber, int MAXpower, int wait) {
Pa = (sin(stepnumber*0.098174)*MAXpower);
Pb = (cos(stepnumber*0.098174)*MAXpower);
if (Pa>0)
{
ledcAnalogWrite(LEDC_CHANNEL_0,Pa);
ledcAnalogWrite(LEDC_CHANNEL_1,0);
}
else
{
ledcAnalogWrite(LEDC_CHANNEL_0,0);
ledcAnalogWrite(LEDC_CHANNEL_1,abs(Pa));
}
if (Pb>0)
{
ledcAnalogWrite(LEDC_CHANNEL_2,Pb);
ledcAnalogWrite(LEDC_CHANNEL_3,0);
}
else
{
ledcAnalogWrite(LEDC_CHANNEL_2,0);
ledcAnalogWrite(LEDC_CHANNEL_3,abs(Pb));
}
}
void move_routine(void *parameters) {
while(1) {
for (int i=0; i<3199; i++)
{
stepnumber++;
move(stepnumber,255,250);
}
vTaskDelay(3000/portTICK_PERIOD_MS);
for (int i=0; i<1599; i++)
{
stepnumber--;
move(stepnumber,255,1000);
}
vTaskDelay(3000/portTICK_PERIOD_MS);
}
}
void led_task(void * parameters){
while(1){
digitalWrite(ledPin, HIGH);
vTaskDelay(500/portTICK_PERIOD_MS);
digitalWrite(ledPin, LOW);
vTaskDelay(500/portTICK_PERIOD_MS);
}
}
void setup(){
myStepper.setSpeed(60);
pinMode(ledPin, OUTPUT);
Serial.begin(115200);
xTaskCreatePinnedToCore(
move_routine,
"Move Routine",
8192,
NULL,
1,
NULL,
1
);
xTaskCreatePinnedToCore(
led_task,
"LED Task",
1024,
NULL,
1,
NULL,
1
);
}
void loop(){
}
Expected to see flashing led and motor turning but nothing witnessed
Your two tasks work as it were defined, the problem is your ledcAnalogWrite() function where you are calling ledcWrite() function with nowhere in your code initialise the LEDC with ledcSetup() and ledcAttachPin().
Read the documentation on LED Control(LEDC).
I am working on attiny85 for I2C communication. I have gone through different libraries already like Wire.h, TinyWire.h, tinyWireM.h, tinyWireS.h.
In the start I want to send some byte of data through I2C comm and tried to scope the pin with oscilloscope but its not giving me the appropriate results. Looking on the internet about different ways to make attiny85 work with I2c is really heartless and I could not achieve the task. Finally, I tried to make attiny85 as master and arduino Uno as slave as it was spare in my box.
I tried to make attiny85 as master and send data to arduino and looks the output on serial monitor but its showing zero.
For the reference, the master and slave codes are attached and my task is just simple to check on serial.
Attiny85 as Master
#include <TinyWireM.h>
void setup()
{
TinyWireM.begin();
}
void loop()
{
TinyWireM.begin();
TinyWireM.beginTransmission(0x08);
TinyWireM.send(0x99);
int Byte1 = TinyWireM.endTransmission();
delay(1000);
}
Arduino as Slave
#include <Wire.h>
const byte add = 0x08;
int byte1;
void setup()
{
Wire.begin(add);
Wire.onReceive(receiveEvent);
Serial.begin(9600);
}
void loop()
{
Serial.println ("Data receiving");
Serial.println(byte1);
delay(1000);
}
void receiveEvent(int bytes)
{
byte1 = Wire.read();
}
But I am not able to get the output on serial monitor of arduino.
What am i doing wrong here?
I have used Atiny85 as a slave using TinyWireS lib (https://github.com/nadavmatalon/TinyWireS) some time back and it worked fine.
Below were the pin configurations
ATtiny85 pin 5 with Arduino Uno A4 and
ATtiny85 pin 7 with Arduino Uno A5
Below are my codes
Atiny.
#include "TinyWireS.h"
const byte SLAVE_ADDR = 100;
const byte NUM_BYTES = 4;
volatile byte data = { 0, 1, 2, 3 };
void setup() {
TinyWireS.begin(SLAVE_ADDR);
TinyWireS.onRequest(requestISR);
}
void loop() {}
void requestISR() {
for (byte i=0; i<NUM_BYTES; i++) {
TinyWireS.write(data[i]);
data[i] += 1;
}
}
Uno.
#include <Wire.h>
const byte SLAVE_ADDR = 100;
const byte NUM_BYTES = 4;
byte data[NUM_BYTES] = { 0 };
byte bytesReceived = 0;
unsigned long timeNow = millis();
void setup() {
Serial.begin(9600);
Wire.begin();
Serial.print(F("\n\nSerial is Open\n\n"));
}
void loop() {
if (millis() - timeNow >= 750) { // trigger every 750mS
Wire.requestFrom(SLAVE_ADDR, NUM_BYTES); // request bytes from slave
bytesReceived = Wire.available(); // count how many bytes received
if (bytesReceived == NUM_BYTES) { // if received correct number of bytes...
for (byte i=0; i<NUM_BYTES; i++) data[i] = Wire.read(); // read and store each byte
printData(); // print the received data
} else { // if received wrong number of bytes...
Serial.print(F("\nRequested ")); // print message with how many bytes received
Serial.print(NUM_BYTES);
Serial.print(F(" bytes, but got "));
Serial.print(bytesReceived);
Serial.print(F(" bytes\n"));
}
timeNow = millis(); // mark preset time for next trigger
}
}
void printData() {
Serial.print(F("\n"));
for (byte i=0; i<NUM_BYTES; i++) {
Serial.print(F("Byte["));
Serial.print(i);
Serial.print(F("]: "));
Serial.print(data[i]);
Serial.print(F("\t"));
}
Serial.print(F("\n"));
}
I am trying to get a LED blinking on my pic18f25k80.
The LED is connected to pin: RC1.
I think that I might be missing some configuration.
BR
Fredrik
#include <p18f25k80.h>
void delay1s(void);
void main(void) {
TRISC = 0;
OSCCON = 0xF2;
while (1) {
delay1s();
LATC = 0xFF;
delay1s();
LATC = 0x00;
}
}
void delay1s(void) {
int m,n;
for (m=0;m<200;m++) {
for (n=0;n<200;n++);
}
}
update:
Found the actual problem, I needed this configuration:
# pragma config SOSCSEL = 0x2
I have my sketch(simplified version) as shown:
int sensorPin = 0; // select the input pin for the photocell
int ledPin = 11; // select the pin for the LED
int sensorValue = 0; // variable to store the value coming from the sensor
int auto = 0;
void setup() {
// declare the ledPin as an OUTPUT:
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
// read the value from the sensor:
sensorValue = analogRead(sensorPin);
Serial.print("Digital reading = ");
Serial.println(sensorValue); // the raw analog reading
// turn the ledPin on
if (auto > 1)
if (sensorValue < 700){
digitalWrite(ledPin, LOW);
}else{
digitalWrite(ledPin,HIGH);
}
// stop the program for <sensorValue> milliseconds:
delay(10);
}
however it shows the error shown and highlights this line. int auto = 0; I have tried everything in my power, such as moving it, and changing it to a Boolean, but i can't get it to work.
"auto" is a keyword meaning, that a variable is automatically given the data type of its initialiser. Replace it with a non-reserved work and it will compile.
This IDE does not syntax it. Where np++ and others does.
I'm fighting with this problem from a long time.
I can't get OpenCV to work, and I have follow a lot of tutorials about it and how to use in Qt, so I get tired and I want to avoid the use of OpenCV for this.
Now, my requirement or question... I need to show a webcam feed (real time video, without audio) in a Qt GUI application with only one button: "Take Snapshot" which, obviusly, take a picture from the current feed and store it.
That's all.
Is there anyway to get this done without using OpenCV ?
System specification:
Qt 4.8
Windows XP 32 bits
USB 2.0.1.3M UVC WebCam (the one I'm using now, it should support other models too)
Hope anybody can help me with this because I'm getting crazy.
Thanks in advance!
Ok, I finally did it, so I will post here my solution so we have something clear about this.
I used a library called 'ESCAPI': http://sol.gfxile.net/escapi/index.html
This provide a extremely easy way to capture frames from the device. With this raw data, I just create a QImage which later show in a QLabel.
I created a simple object to handle this.
#include <QDebug>
#include "camera.h"
Camera::Camera(int width, int height, QObject *parent) :
QObject(parent),
width_(width),
height_(height)
{
capture_.mWidth = width;
capture_.mHeight = height;
capture_.mTargetBuf = new int[width * height];
int devices = setupESCAPI();
if (devices == 0)
{
qDebug() << "[Camera] ESCAPI initialization failure or no devices found";
}
}
Camera::~Camera()
{
deinitCapture(0);
}
int Camera::initialize()
{
if (initCapture(0, &capture_) == 0)
{
qDebug() << "[Camera] Capture failed - device may already be in use";
return -2;
}
return 0;
}
void Camera::deinitialize()
{
deinitCapture(0);
}
int Camera::capture()
{
doCapture(0);
while(isCaptureDone(0) == 0);
image_ = QImage(width_, height_, QImage::Format_ARGB32);
for(int y(0); y < height_; ++y)
{
for(int x(0); x < width_; ++x)
{
int index(y * width_ + x);
image_.setPixel(x, y, capture_.mTargetBuf[index]);
}
}
return 1;
}
And the header file:
#ifndef CAMERA_H
#define CAMERA_H
#include <QObject>
#include <QImage>
#include "escapi.h"
class Camera : public QObject
{
Q_OBJECT
public:
explicit Camera(int width, int height, QObject *parent = 0);
~Camera();
int initialize();
void deinitialize();
int capture();
const QImage& getImage() const { return image_; }
const int* getImageRaw() const { return capture_.mTargetBuf; }
private:
int width_;
int height_;
struct SimpleCapParams capture_;
QImage image_;
};
#endif // CAMERA_H
It's so simple, but just for example purposes.
The use should be something like:
Camera cam(320, 240);
cam.initialize();
cam.capture();
QImage img(cam.getImage());
ui->label->setPixmap(QPixmap::fromImage(img));
Of course, you can use a QTimer and update the frame in QLabel and you will have video there...
Hope it help! and thanks Nicholas for your help!