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Questions tagged [samd21]

47 questions
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Error connecting DP: cannot read IDR-No connection could be made because target machine actively refused it

I could program and debug this project for the first time. But the problem is that I can't reprogram or debug it again. There is no bootloader on the chip. The only way to communicate with this chip is SWD. As a debugger, I am using Atmel ice. The…
Mary
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How to avoid issues with sleep mode after disconnecting device from PC?

I am having an issue with my satellite project. When I disconnect my device from the PC, sleep mode does not work - I suppose it is because somewhere in the code I have function if, that includes (Serial.available()). But I am not sure, so that is,…
Adaf Boka
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Atmel SAMD21 DMAC writeback failure?

I'm using multiple DMA channels in an Atmel SAMD21G18A (in an Arduino MKR1000), and I'm seeing some obviously incorrect behaviour. DMA channels 2 & 3 are servicing a SERCOM SPI channel, using single block transfers with a completion interrupt. DMA…
Jeremy
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Adafruit Trinket M0 (SAMD21) analog read rate slow

Why is the analog read rate seemingly slow (46 ksamples/s) when it should be fast (250 ksamples/s) for my Adafruit Trinket M0? See this simple Arduino code for details; why is PointCount only 46? //TrinketReadRateTest //27Nov2022 //Running on…
CrowMagnumMan
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Building Atmel START project to load with UF2 bootloader

I'm trying to build an Atmel START project using GCC such that it will load with the Adafruit UF2 bootloader on a SAMD21 chip. From prior research I've learned that I need to have the text section start at offset 0x2000, and I need to specify the…
Xavier Denis
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SAMD21 SPI configuration without ASF

I'm currently working on a project optimization based on SAMD21J18A µC. My code is working but it's based on ASF API an I'm trying to gradually get rid of it. I managed to do it for most of my code but I'm experiencing difficulties when I want to…
Fanch
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micropython and sys.implementation- different on XIAO SAMD21 and XIAO RP2040

I was working with micropython on a SEEED XIAO (SAMD21) using version 1.18, and wanted to use 'compiled' libraries (.mpy) to conserve space. I had mpy-cross for version 5 which worked okay for me. I also wanted to have floating point so I built a…
user1725445
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SAMD21 fault writing to Serial after reading I2C data asynchronously

Problem: As soon as I write to the USB serial port after accessing my I2C device asynchronously (polling it in main loop rather than a blocking loop), I get a CPU exception Background: I have an Arduino project running under Microchip studio (for…
N8allan
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How to change linker scripts from samd21j18a to samd21e16b for sam-ba?

I am trying to change the linker scripts that sam-ba (sam bootloader assistant) is using. The liner scripts are written for samd21j18a by Atmel Corporation (tcl_lib and applet). The samd21e16b Sram is 8 kB and the flash memory is 64 kB, based on the…
Mary
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what are the arduino IDE build steps for a sketch?

I'm trying to build my own, terminal based environment to build and upload programs to a custom board I Have with an SAMD21 (Like in the arduino MKRZERO) To do so I'm looking at the verbose output of the arduino IDE and trying to move the same…
hf98a6r7fayh
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Arduino MKR Wifi 1010 Serial Communication with Arduino Mega

I am writing a serial communication program between a mkr wifi 1010 and a mega in which the mkr sends either a H or L char to the mega, and the mega responds by reading the char and setting it's onboard LED to either high or low depending on the…
JGoss
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Why samd21 is reading modbus own response as a master request?

I'm adding slave MODBUS RTU communication over RS-485 (by chip ADM2587EBRWZ) into a SAMD21 existing program. Only Read holding register and Write single register commands implemented as I don't need more. To test it I use a PLC by Microcom as…
NKE-Mick
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SAMD21: how to set PWM using TCC?

I'm programming a SAMD21 and I need PWM. When I chose pin with F function TCC0 output: PA22 - TCC0/WO[4] PA23 - TCC0/WO[5] I successfully configured TCC0 base counter: // enable clock for TCC0 - disable clock masking PM->APBCMASK.reg |=…
EFK
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How to determine CRC16 initial checksum so resulting checksum is zero

Working on a SPI communication bus between an array of SAMD MCUs. I have an incoming packet which is something like { 0x00, 0xFF, 0x00, 0xFF }. The receiver chip performs CRC16 check on the incoming packet. Since I am expecting the exact same…
NikoDiYana
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How to achieve Adafruit Feather M0 Sleep & Wake on External Interrupt using any Pin?

I am currently working on a low-power project using the Adafruit Feather M0 microprocessor. A requirement of my project is to be able to sleep the CPU and wake it again using an external interrupt triggered from the MPU6050 accelerometer. I have…
Philip Crocker
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