I have a program written in C++ on a Raspberry Pi 3. I mmap /dev/gpiomem to access the GPIO registers directly in user mode. Here is my function to write to output pins:
static uint32_t volatile *gpiopage; // initialized by mmap() of /dev/gpiomem
static uint32_t lastretries = 0;
void PhysLib::writegpio (uint32_t value)
{
uint32_t mask = 0xFFF000; // [11:00] input pins
// [23:12] output pins
// all the pins go through an inverter converting the 3.3V to 5V
gpiopage[GPIO_CLR0] = value;
gpiopage[GPIO_SET0] = ~ value;
// sometimes takes 1 or 2 retries to make sure signal gets out
uint32_t retries = 0;
while (true) {
uint32_t readback = ~ gpiopage[GPIO_LEV0];
uint32_t diff = (readback ^ value) & mask;
if (diff == 0) break;
if (++ retries > 1000) {
fprintf (stderr, "PhysLib::writegpio: wrote %08X mask %08X, readback %08X diff %08X\n",
value, mask, readback, diff);
abort ();
}
}
if (lastretries < retries) {
lastretries = retries;
printf ("PhysLib::writegpio: retries %u\n", retries);
}
}
Apparently there is some internal cache or something delaying the actual updating of the pins. So I'm wondering if there is some magic MRC or MCR or whatever that I can put so I don't have to read the pins to wait for the update to actually occur.
I'm quite sure this is happening because this code is part of a loop:
while (true) {
writegpio (0x800000); // set gpio pin 23
software timing loop for 1uS
writegpio (0); // clear gpio pin 23
software timing loop for 1uS
}
Sometimes Linux timeslices during the software timing loops on me and I get a delay longer than 1uS, which is ok for this project. Before I put in the code that loops until it reads the updated bit, sometimes the voltage on the pin stays high for longer than 1uS and is then low for correspondingly less than 1uS, or vice versa, implying that there is a total of 2uS delay for the two timing loops but the update of the actual pin is being delayed by the hardware. After inserting the corrective code, I always get at least 1uS of high voltage and 1uS of low voltage each time through the loop.
I am trying to make a countdown timer using an ATmega32 clocked at 8 MHz.
I want to use the ATmega timer to start a countdown for 8 minutes when the switch is pressed and the output should turn on for 8 minutes and when the countdown hits zero the output should turn off and the countdown returning back to zero. (All this I want to show on a 16*2 LCD). I know that I have to use a timer for that, but I am really not sure on how to do it. Any suggestions?
Is creating this much long delay from an AVR timer possible or not?
Please don't be angry with me(I don't want to disrespect you people by answering my own question).I had tried to solve my problem myself and I had achieved this, this code works thanks for your valuable time to answer my questions. I have posted the code so that new people can benefit from it. Thanks for your time.
volatile uint16_t second_count = 0;
void init_timer1(void);
void init_timer1()
{
TCCR1B |= (1<<WGM12);//CTC mode
TCNT1 = 0;//initializing timer
OCR1A = 31249;//preloading timer so that it can count with 1 sec
TIMSK |= (1<<OCIE1A);//Timer compare A Match interrupt
TCCR1B |= (1<<CS12);//Starting timer and clock prescaler(256)
}
ISR(TIMER1_COMPA_vect)
{
second_count++;
if(second_count == 180)//turing the output on for 180 seconds on power on
{
PORTD |= (1<<PD6);
}
else
{
PORTD &= ~(1<<PD6);
second_count = 0;
}
}
int main(void)
{
init_timer1();
sei();
DDRD = 0xff;
PORTD = 0x00;
DDRB = 0x00;
PORTB = 0xff;
while(1)
{
}
}
I'm currently trying to set up a fermentation specific gravity monitor, using a tilt sensor. The process can take several weeks, and must be contained in a sterile container, so must be battery powerered. I'm using a slightly modified ESP8266-01, which enters sleep mode then wakes once an hour to take a measurement, transmit the data, and return to sleep mode. I'm using an MPU6050 for the tilt sensor. Firstly, I can't seem to put the mpu into sleep mode when the esp is off, it always seems to take around 4mA, and secondly, I only need one axis, is it possible to disable everything else to limit power consumption further? I can't seem to find anything in the manual to disable axis, only to calibrate them. my code is below
experimenting with the registers below seem to make no difference, adding them, taking them out altogether, still takes around 4mA. Tried setting to 1 to put the mpu to sleep at the end of the cycle but makes no difference.
Wire.write(0x6B);
Wire.write(0);
I'm very new to this and im struggling to interpret the manual when it refers to bit6 in addr 6b, how do i set bit 6?
If i could restict the mpu to only 1 axis, no acceleration, and to deep sleep inbetween measurements I should be able to get the power consumption around 0.5mA which gives me agood battery life using a single 18650. Any advice would be greatly appreciated!
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "MPU6050.h"
#include "I2Cdev.h"
#include "Wire.h"
// Update these with values suitable for your network.
const char* ssid = "****";
const char* password = "******";
IPAddress server(192, 168, 1, 90);
WiFiClient espClient5;
PubSubClient client(espClient5);
long lastMsg = 0;
char msg[50];
const uint8_t scl = 5; //D1
const uint8_t sda = 4; //D2
int val;
int prevVal = 0;
String pubString;
char gravity[50];
MPU6050 mpu;
const int sleepTimeS = 10; //only 10 seconds for testing purposes, set to
1hr when operational
int counter=0;
int16_t ax, ay, az;
int16_t gx, gy, gz;
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) { //not
required in this application
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "test";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str())) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("AliveRegister", "FermentMon");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
#define ONE_WIRE_BUS 2 // D4 on physical board
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
float prevTemp = 0;
void setup() {
counter = 0;
Serial.begin(9600);
Wire.begin(0,2);
Wire.write(0x6B); //PWR_MGMT_1 register
Wire.write(0); // set to zero wakes teh 6050
Wire.endTransmission(true);
delay(100);
setup_wifi();
client.setServer(server, 1883);
client.setCallback(callback);
if (!client.connected()) {
reconnect();
}
Serial.println("Initialize MPU");
mpu.initialize();
Serial.println(mpu.testConnection() ? "Connected" : "Connection failed");
float temp;
DS18B20.requestTemperatures();
temp = DS18B20.getTempCByIndex(0); // first temperature sensor
char buff[100];
dtostrf(temp, 0, 2, buff);
temp = temp + 0.5;
int tRound = int(temp);
client.publish("Fermenter/temperature", buff);
Serial.print("Fermenter Temperature: ");
Serial.println(temp);
prevTemp = tRound;
mpu.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
val = map(ax, -17000, 17000, 0, 180);
pubString = String(val);
pubString.toCharArray(gravity, pubString.length() + 1);
client.publish("Fermenter/angle", gravity);
Serial.print("Gravity angle: ");
Serial.println(val);
delay(500);
// counter = counter+1;
Serial.println("sleep mode");
Wire.write(0x6B); //PWR_MGMT_1 register
Wire.write(1); // set to zero wakes teh 6050
// sleep
ESP.deepSleep(sleepTimeS * 1000000);
delay(2000);
}
void loop() {
client.loop();
}
I'm very new to this and im struggling to interpret the manual when it refers to bit6 in addr 6b, how do i set bit 6?
Setting a bit is simple.
Use the follow functions to avoid any brain storming.
// Write register bit
void writeRegisterBit(uint8_t reg, uint8_t pos, bool state)
{
uint8_t value;
value = readRegister8(reg);
if (state)
{
value |= (1 << pos);
}
else
{
value &= ~(1 << pos);
}
writeRegister8(reg, value);
}
// Write 8-bit to register
void writeRegister8(uint8_t reg, uint8_t value)
{
Wire.beginTransmission(MPU_addr);
#if ARDUINO >= 100
Wire.write(reg);
Wire.write(value);
#else
Wire.send(reg);
Wire.send(value);
#endif
Wire.endTransmission();
}
Example Usage: writeRegisterBit(MPU6050_REG_INT_PIN_CFG, 5, 1); //Register 37;Interrupt Latch Enable
For your application:
void acclSetSleepEnabled(bool state)
{
writeRegisterBit(MPU6050_REG_PWR_MGMT_1, 6, state);
}
If i could restict the mpu to only 1 axis, no acceleration, and to deep sleep inbetween measurements I should be able to get the power consumption around 0.5mA which gives me agood battery life using a single 18650
To enter low power accelerometer mode use the following function:
void lowPowerAccel(uint8_t frequency) {
uint8_t value;
value = readRegister8(MPU6050_REG_PWR_MGMT_2);
value &= 0b00111000;
value |= (frequency << 6) | 0b111;
writeRegister8(MPU6050_REG_PWR_MGMT_2, value);
value = readRegister8(MPU6050_REG_PWR_MGMT_1);
value &= 0b10010111;
value |= 0b00111000;
writeRegister8(MPU6050_REG_PWR_MGMT_1, value);
}
This lowPowerAccel function also puts the gyro to standy mode. The function needs a wake up frequency parameter.
This is defined as follows:
/*
* LP_WAKE_CTRL | Wake-up Frequency
* -------------+------------------
* 0 | 1.25 Hz
* 1 | 2.5 Hz
* 2 | 5 Hz
* 3 | 10 H
*/
#define LP_WAKE_CTRL_1_25 0x00
#define LP_WAKE_CTRL_2_5 0x01
#define LP_WAKE_CTRL_5 0x02
#define LP_WAKE_CTRL_10 0x03
I hope, I could answer some of your questions.
Good luck! :)
Are you using a breakout board for the MPU6050? e.g. GY-521. Often they use linear regulators and leds which will consume additional power. It may be necessary to remove these and run the IMU from a direct power source.
Each register in the MPU6050 is 8 bits wide. When setting an individual bit to a desired value you can either use bitwise manipulation (not practical here as we aren't directly interacting with the registers) or directly set all of the bits in the register to the register's new state e.g. 0b00100000 ~ 0x20. Instead of writing a 1 to 0x6B when attempting to put the MPU6050 to sleep you should be writing 0x20.
https://www.invensense.com/wp-content/uploads/2015/02/MPU-6000-Register-Map1.pdf
Referencing page 40-42, if you want to take things a step further you can disable the temperature sensor, accelerometers, and redundant gyroscope axes to save power while the device is active.
I need to interface to a PIC10 micro with some serial interface. Since these small devices lack hardware support for SPI I2C and UART a Software solution is inevitable.
However, since I need to preserve as much of the Programm memory to store (static) configuration and identify information to be retrieved via said interface, what would probably be the smallest solution?
I will need to program this in ASM since there seems no good C compiler for PIC10. However, this will be my first real encounter with ASM to speak of.
Try this download which contains code samples and says:
"Listed below are five PIC UART software routines to use with PIC microprocessors that have no hardware UART"
Link rot has broken the original link try this link.
In my opinion the xc8 compiler works pretty well, also for the PIC10.
Here is an example in C:
#include <xc.h>
#ifndef _XTAL_FREQ
#define _XTAL_FREQ 4000000
#endif
#define Baudrate 1200 //bps
#define OneBitDelay (1000000/Baudrate)
#define DataBitCount 8 // no parity, no flow control
#define UART_RX RA1 // UART RX pin
#define UART_TX RA0 // UART TX pin
#define UART_RX_DIR TRISA1 // UART RX pin direction register
#define UART_TX_DIR TRISA0 // UART TX pin direction register
//Function Declarations
void InitSoftUART(void);
unsigned char UART_Receive(void);
void UART_Transmit(const char);
__CONFIG(FOSC_INTOSC & MCLRE_OFF & WDTE_OFF & LVP_OFF & CP_OFF &
WRT_OFF & PWRTE_OFF & WRT_OFF & BOREN_ON & LPBOR_ON & BORV_LO);
void main()
{
unsigned char ch = 0;
ANSELA = 0x00; // Set ports as digital I/O, not analog input
ADCON = 0x00; // Shut off the A/D Converter
FVRCON = 0x00; // Shut off the Voltage Reference
PORTA = 0x00; // Make all pins 0
InitSoftUART(); // Intialize Soft UART
InitSoftUART(); // Intialize Soft UART
while(1)
{
ch = UART_Receive(); // Receive a character from UART
UART_Transmit(ch); // Echo back that character
}
}
void InitSoftUART(void) // Initialize UART pins to proper values
{
UART_TX = 1; // TX pin is high in idle state
UART_RX_DIR = 1; // Input
UART_TX_DIR = 0; // Output
}
unsigned char UART_Receive(void)
{
// Pin Configurations
// GP1 is UART RX Pin
unsigned char DataValue = 0;
//wait for start bit
while(UART_RX==1);
__delay_us(OneBitDelay);
__delay_us(OneBitDelay/2); // Take sample value in the mid of bit duration
for ( unsigned char i = 0; i < DataBitCount; i++ )
{
if ( UART_RX == 1 ) //if received bit is high
{
DataValue += (1<<i);
}
__delay_us(OneBitDelay);
}
// Check for stop bit
if ( UART_RX == 1 ) //Stop bit should be high
{
__delay_us(OneBitDelay/2);
return DataValue;
}
else //some error occurred !
{
__delay_us(OneBitDelay/2);
return 0x000;
}
}
void UART_Transmit(const char DataValue)
{
/* Basic Logic
TX pin is usually high. A high to low bit is the starting bit and
a low to high bit is the ending bit. No parity bit. No flow control.
BitCount is the number of bits to transmit. Data is transmitted LSB first.
*/
// Send Start Bit
UART_TX = 0;
__delay_us(OneBitDelay);
for ( unsigned char i = 0; i < DataBitCount; i++ )
{
//Set Data pin according to the DataValue
if( ((DataValue>>i)&0x1) == 0x1 ) //if Bit is high
{
UART_TX = 1;
}
else //if Bit is low
{
UART_TX = 0;
}
__delay_us(OneBitDelay);
}
//Send Stop Bit
UART_TX = 1;
__delay_us(OneBitDelay);
}
Source for this code is the :Microchip forum
I can't get my pic24f04kl100 to turn on an LED at all. The below code is as simple as possible and it still doesn't turn on the LED on pin 6.
Code
#include <xc.h>
#define LED LATBbits.LATB4
#define LEDans ANSBbits.ANSB4
#define LEDtris TRISBbits.TRISB4
/* Setting up configuration bits */
_FOSCSEL(FNOSC_FRCPLL & IESO_OFF); // FRC w/PLL and int./ext. switch disabled
_FOSC(POSCMD_XT & FCKSM_CSECMD); // Pri. OSC XT mode and clk. switch on, fail-safe off
_FWDT(FWDTEN_OFF); // Watchdog timer off
void initialise();
void delay(int i);
void main() { // Main program loop
initialise(); // Intialise PIC
while (1) { // Infinite loop
LED = 1; // Set LED high
LED = 0; // Set LED low
}
}
void initialise() { // Configures the PIC
OSCCONbits.NOSC = 0b111; // Fast RC Oscillator with Postscaler and PLL module
delay(100);
CLKDIVbits.RCDIV = 0b000; // Set clock div 1:1
delay(100);
LEDans = 0;
delay(100);
LEDtris = 0; // Make LED an output
delay(100);
LED = 0; // Set LED low
}
void delay(int i) {
while(i--);
}
PICkit 3 Output
*****************************************************
Connecting to MPLAB PICkit 3...
Firmware Suite Version.....01.27.04
Firmware type..............dsPIC33F/24F/24H
Target detected
Device ID Revision = 0
The following memory area(s) will be programmed:
program memory: start address = 0x0, end address = 0x3ff
configuration memory
Programming...
Programming/Verify complete
By default B4 pin is analog. Configure it as digital by clearing the ANSB register, bit4
NOTE: Although clearing the bit DID NOT fix the problem. Moving to another pin (with less features) did. So I (fossum) made the assumption that this was at least on some level the correct answer.
The LED is blinking, but it's blinking very fast, try to put some delay between LED turn on and LED turn off.
Try this:
void main() { // Main program loop
initialise(); // Intialise PIC
while (1) { // Infinite loop
LED = 1; // Set LED high
delay(50000); //wait LED on time
LED = 0; // Set LED low
delay(50000); //wait LED off time
}
}