Questions tagged [port-mapping]
Port-mapping refers to directly accessing the hardware registers (ports), in particular the input/output ports. Use this tag for discussing direct port access.
78 questions
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Can't upload to nano esp32
Recently bought a nano esp32 to play around with the small size and wifi module. However I'm plagued by the No DFU capable USB device available message.
My efforts and deductions:
I can connect to ...
- 21
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USB-C to USB-C cable Arduino is not responding even not powered by this cable
Hi I want to connect arduino NANO to my laptop with Type-C (USB-C) ports (on below image left side [4] and other side 3). Now I bought a USB-C to USB-C cable, because it appeared to be the right tool, ...
- 297
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341
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Is there a definitive reference for the Arduino DUE?
I am looking for a reference document or documentation system that concretely relates at minimum:
Screen printed pin name/number
SAM3X8E pin number
Register number
Channel number
Port name
In my ...
- 295
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105
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SparkFun RedBoard PTH Kit wrongly configured hardware
I have a SparkFun RedBoard PTH Kit. It's not made by SparkFun, but by https://inmotion.pt (that doesn't exist anymore). I soldered it, and bought a FTDI adapter, but when I try to upload the blink ...
- 121
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Atmega2560 PWM on PH4
I am trying to convert the following code to output to pin 7 (PH4, OC4B) on an Arduino Mega. The code outputs to pin 6. This code is from a GitHub for the GRBL on the Mega "https://github.com/...
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Unable to use rising edge interrupt for external clock Arduino 2650
I'm messing about with an Arduino Mega2560r3 and failing to get timer 4 to trigger on the rising edge of an external clock. It only ever triggers on the falling edge.
I've tried
TCCR4B = (1 <&...
- 11
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About Corrupted LM35 IC and Arduino port problem
I have one Arduino Uno which was working fine by below circuit(link):
But when I have connected the new bought the LM35 Ic by the below connection:
The Arduino UNO don't be recognized by the my ...
- 201
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Why my arduino board does not blink properly?
I have two files
blink1.cpp
typedef unsigned char int8_t;
typedef volatile int8_t * volatile port_type;
port_type portB = (port_type) 0x25;
port_type ddrB = (port_type) 0x24;
void delay_500ms()
{
...
- 173
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1
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1k
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Configure input pullup through registers
I can set pin mode to input or output through the DDRx registers. How can I enable the internal pullup resister through a register?
- 127
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539
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Valid options for output port on Mega 2560
I would like to adopt this library on an Arduino Mega2560:
https://github.com/gueei/DShot-Arduino
However, the macro DSHOT_PORT needs defined for the Mega2560 here:
https://github.com/gueei/DShot-...
- 103
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Can't upload code to Arduino board on Mac
I'm using a MacBook Pro with 10.13.6, an Official Arduino Uno Board and Arduino 1.8.13 IDE.
I'm having troubles uploading code to the Arduino Board.
I have 5 ports available:
dev/cu.-AvnetaSPPPort
...
-1
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1
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255
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Port manipulation
My UNO having some stability issues because of heavy memory use, I'm now optimizing the code
now looking to reduce the digital read memory use with the help of port manipulation. I got the code for ...
- 41
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4
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Why do we use bitwise operators to assign PORTx, DDRx and Pinx?
I have come accross a lot of examples using ways similar to the ones shown below to assign values to the pins.
PORTB |= (1<<PORTB2); //set bit 2
PORTB &= ~(1<<PORTB1); //clear bit 1
...
- 23
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343
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problems with Blue Pill (stm32f103c8t6) direct register manipulation
I'm trying to access registers but I keep getting the "was not declared in this scope" error message.
I'm currently using the STM32F1xx boards from http://dan.drown.org/stm32duino/...
- 123
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3
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343
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ATMega328 functions, but will not output to any pins
Problem:
ATMega328 Refuses to digitalWrite() to any pins, I can upload and run sketches using the board UNO from the ide on the 328 and can confirm it is working using the serial monitor (see code).
I ...
