Samd21 adc channel 3rd Party Boards. The MCU used is ATSAMD21E18A. start. This value can be calculated from the SAMD21 datasheet: __1) ADC Sample Time Calculation__ Take the processor clock at (approximately) 48MHz and divide by the ADC prescaler set at 512: ADC Clock Frequency = 48MHz / 512 = 93750Hz Therefore the ADC In addition to the DAC, the SAMD21's ADC channels also stand apart from the ATmega328: they're equipped with up to 12-bit resolution. SAMD21 UART assignments Setting duty cycle for pwm output with single ended adc input. To use the ADC's in 12-bit mode, make sure you call analogReadResolution(12) in your setup. k. IO supply: The ADC of the SAMD21 has an input channel which measures the "1/4 scaled IO supply". CONFIG_RTC. read_u16 () # read value, 0-65536 across voltage range 0. With a successful DMA resource allocation, a dedicated DMA channel is assigned. Learn More. . Unlike the popular ATMega series, this microcontroller features an ARM Cortex M0+ core. Serial Plotting the DAC Reads a differential voltage with pos_pin and neg_pin. These pins correspond to the values given in the Arduino headers. 0 * ADC_REF / ADC_COUNT) Giving it a 5V reference voltage is violating the absolute maximum parameters. an on-board USB converter (compatible with Mac, Windows, and Linux), a two channel I2S interface, and much more! The SAMD21 is also compatible with many of the sensor libraries in Arduino that function with I2C Communicate to multi-slot or multiple stereo DACs or ADCs, via Time Division Multiplexed (TDM) format; (PDM) interface. 67. I use arduino ide to compile code, then upload through atmel studio using ice but because the pins from the mcu are different on the pcb I have not had a successful test. Bottom line: The CPU has a 12-bit SAMD21 introduction. // Turn the clocks on. When reading from the RWWEE area, it (ADC) channels 10 14 Analog Comparators (AC) 2 4 Digital-to-Analog Converter (DAC) channels 1 1 Real-Time Counter (RTC) Yes Yes – 12-channel Direct Memory Access Controller (DMAC) – 12-channel Event System – Up to five 16-bit Timer/Counters (TC), configurable as either: • One 16-bit TC with two compare/capture channels • One 8-bit TC with two compare/capture channels • One 32-bit TC with two compare/capture channels, by using two TCs Hi, I try to attach an interrupt on a samd21 controller with attachInterrupt(25, ISR, FALLING); but the interrupt doesn't get triggered. 806mV when the processor SERCOM (Serial Communication) is a multiplexed serial configuration used on the SAMD21, SAMD51 and other boards. west build -b seeed_xiao_samd21 -S usb-console. \$\endgroup\$ If you’re ready to step your Arduino game up from older 8-bit/16MHz microcontrollers, the SparkFun SAMD21 Mini Breakout is a great landing spot. Tiny45 ADC. x and have successfully modified the EmonLib code to work with the SAMD21 ADC. The data sheet asks you to limit this to VDD - 0. chapman_g. atmel,sam0-adc. The issue is that when I enable SerialUSB and turn off some I/O the MCU crashes. Note that for the use of the SAM 15x15 board, you don't have to read this. SAMPLEN. h/. CSS Error The ADC can be triggered from a TCCx timer internally using the SAMD21's event system. Unfortunately I found no way in the arduino core to measure the "special" ADC channels (e. txt etc. I am very new to Microchip Studio (Arduino convert trying to upgrade). I've read variant. A0 and A1) Zero. I haven't done too much programming in the Arduino environment so I'm a little confused about using The SAMD21 on the Arduino Zero has a 12 channel DMAC (Direct Memory Access Controller). cpp, seen boards . That means you can have 3 UART's & 3 SPI's, or maybe 2 SPI's and 4 I2C's. 3 // volts #define ADC_COUNT 4096 #define ADC_LSB_MV (1000. MUXPOS=0x1B) Microchip Technology The SAMD21 or more precisely the ATSAMD21G18 is a microcontroller manufactured by Atmel. 6V. The I²S supports compact stereo data word where left channel data bits are in the lower half and right channel data bits are in the upper half. Then configure your ADC in one of three possible cases: config_adc. Analog-to-Digital Converter (ADC) RTC. DMA sequencing allows a DMA channel to configure the ADC during operation. These can be turned into either a UART, I2C master, I2C slave, SPI master, and SPI slave. The way this is done is by changing the sample time, ADC->SAMPCTRL. I watched your videos from June 2018. Mar 8, 2017 #19 Had time to do some poking around with a scope, found some interesting things and possible bugs. The ADC may be configured for 8-, 10-, or 12-bit result, reducing the conversion time. Provided you use the same 256k flash, 32k RAM version, in other words the SAMD21J18A, as well as an external 32. Since 2015, there is a new powerful microcontroller available which can be programmed by the Arduino platform: the SAMD21. Go to File> New and click on Example Project. Zero. 0v - 3. Getting Started. 10: 9502: May 6, 2021 One two-channel Inter-IC Sound (I 2 S) interface; One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 20 channels; 10-bit, 350ksps Digital-to-Analog Converter (DAC) Up to four Analog Comparators (AC) with Window Compare function; Peripheral Touch Controller (PTC) 256-Channel capacitive touch and proximity sensing When we first checked out the ATSAMD21 chip (the processor used in the Arduino Zero and Adafruit Feather M0), we were very happy to see that the chip has 6 "SERCOM"s, a. SAMD21 ADC and emonLibCM. The Atmel | SMART SAM D21 [DATASHEET] I found says: ADC has 12-bit resolution, and is capable of converting up to The input impedance is 250kΩ (100kΩ + 150kΩ). 4: 1405: September 30, 2021 Differential ADC 11-Bit? Zero. 3v adc1 = ADC ( Pin ( "A1" ), average = 1 ) # create ADC object on ADC pin, average=1 Loading. I just spoke with the Atmel Rep in my area and in informed me all 12 ADC pins can be driven at the same time on the SAMD21 using atmel studios and codeing there. 62V to 3. The microcontroller board that we choose to use uses the ATSAMD21G18 chip with the following features: 20 PWM channels; a 12-bit ADC channel, running at 350ksps or 350,000 times per second. Atmel-42181DS–SAM-D21_Summary–09/2014 SMART Description The Atmel® | SMART™ SAM D21 is a series of low-power microcontrollers using the 32-bit ARM® Cortex®-M0+ processor, and ranging from 32- to 64-pins with up to 256KB Flash and 32KB of SRAM. In the graphical datasheet supplied by sparkfun for the SAMD21 Mini Breakout it shows that several pins beyond the A0-A4 broken out on the board are available for use as ADCs. 6: 360: November 19, 2024 Setting Inputscan on SAMD21 M0 question. From the Arduino reference documentation:" If you set the analogReadResolution() value to a value higher than your board’s capabilities, the Arduino will only report back at its highest resolution, padding the extra bits with zeros. SAMD21 ADC Configuration. While this simple setup can work for a lot of The following is a tested and working solution and works to change the input pin on the samd21: uint8_t buffer[2]; adc_sync_set_inputs(&ADC,0x10,0x18,0); // set input pin: ADC, Allows for the ADC to read 8, 10, or 12 bits normally or 13-16 bits using oversampling and decimation. SAMD21 devices have 1 DAC channel at GPIO PA02, SAMD51 devices have 2 DAC channels at GPIO PA02 and PA05. ATmega328p only provides 10-bit resolution), A unique feature of the SAMD21 chip is SERCOM, a set of six configurable serial interfaces. The increased resolution means that every bit between 0 and 4095 represents 0. It features: 256KB of flash and 32KB of SRAM Up to 48 -My Initial Idea of making a Channel is to use one micro-controller (SamD21) with an adc (ADS8586S) for example. 2. 63V power supply; Six serial communication modules (SERCOM) configurable as UART/USART, The SAMD21 features 14 ADC input pins with a 12-bit resolution compared to 10-bit on the ATmega328p. Figure 1 SAMD21 in form of Arduino Uno. Contribute to arduino/ArduinoCore-samd development by creating an account on GitHub. 4: 1416: September 30, 2021 SAMD21 ADC Configuration. The below code is my basic "read the input voltage" function to test the ADC. Which tells me it is based on the SAMD21, and may resolve ADC measurements up to 12 bits but not the sampling rate. To do so I also modified the adaino SAMD ADC library to operate in a way such that the ADC readings are captured and stuffed into multiple ring buffers (using interrupts), one for V and one for each current channel. Real-Time Clock (RTC) Timer (Counter) CONFIG_COUNTER. Donziboy2 Well-known member. AIN0 read low noise values. Serial Plotting the DAC The seeed_xiao_samd21 board can be configured for the following different use cases. Both may be used. This means it's possible to get the DMA controller to switch between the three ADC channels in turn without any CPU intervention. See pages 869-870 of the datasheet for In addition to the DAC, the SAMD21's ADC channels also stand apart from the ATmega328: they're equipped with up to 12-bit resolution. Connected 19 Apr 2025 - 06:40 PM Collapsed. 5. SAM D21J: 20 channels; SAM D21G: 14 channels; SAM D21E: 10 channels; 10-bit DAC; Hardware touch support; QFP and QFN package options. megaAVR and tinyAVR. Support for up to 120 touch channels; 1. The XIAO SAMD21 (Seeeduino XIAO) is a tiny (20 mm x 17. When i apply 1,55 V to PA02 the 12 bit adc (with and without sampling on) give an adc value between thr 700 and 800, so i devided this bij 4096 and multiply that with 1,65 i get 0. Connected caraway_seed | Connected 18 Apr 2025 - 05:38 PM. That means the analog input values can range from 0-4095, representing a voltage between 0 and 3. 3V. In my previous blog post, I walked through how to do a basic analog read using the SAM D21's Analog to Digital converter (ADC). When using ADC, different pins must not use the same ADC channel. { No_ADC_Channel=-1, ADC_Channel0=0, ADC_Channel1=1, ADC_Channel2=2, ADC_Channel3=3, ADC_Channel4=4, ADC_Channel5=5, ADC_Channel6=6, I am using a Feather M0 under the arduino ide 1. Basically, you Your correct I miss spoke (A0) is a True analog output using the DAC. Additionally it features a 32-bit Real-Time Clock and calendar, 20 PWM channels, one 14-channel 12-bit ADC, on 10-bit DAC. ADC (analog to digital conversion)¶ On the SAMD21/SAMD51 ADC functionality is available on Pins labelled ‘Ann’. DMA Triggers I've just tested the ADC with 16-bit resolution on my SAMD21 and it's working fine, returning values higher than 12-bit resolution, in other words higher than 4095: SAMD21 - with several parallel ADC channels (e. This works with all analog read functions, including analogRead(uint8_t pin) given The SAM D21 is a series of low-power microcontrollers using the 32-bit ARM® Cortex®-M0+ processor, and ranging from 32- to 64-pins with up to 256KB Flash and 32KB of SRAM. 4: 3818: May 6, 2021 Setting Inputscan on SAMD21 M0 question. It reduces the number of data words for stereo audio data and the direct We are all familiar with the Arduino "analogRead()" function, but there is a lot more to the SAMD21 ADC then just taking simple readings. A unique feature of the SAMD21 chip is SERCOM, a set of six configurable serial interfaces. No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_3 }, westfw January 18, 2021, 10:07pm 4. The device integrates analog functions including an Analog-to-Digital Converter (ADC) with up to 20 channels, a Digital-to-Analog Converter (DAC) and analog comparators. ADC 类: from machine import ADC adc0 = ADC ( Pin ( "A0" )) # create ADC object on ADC pin, average=16 adc0 . Window Monitor. 64 thoughts on “ Your Arduino SAMD21 ADC Is Lying To You ” Wrote code to determine the offset and gain needed for each channel and applied those values with a subroutine in my target code The ARM-based (SAMD21) Arduino Nano 33 IoT might have been rushed into production based on a somewhat deficient assignment of Timer/Counters to PWM pin functions. Last edited: Mar 7, 2017. ". CONFIG_ADC. This happens without having to switch pin's peripherial multiplexer over to the ADC at position B, (see SAMD21 Datasheet Multiplexering Table, Section 7-1). Connected. pdf I will update the sheet as I get time to verify the unconfirmed pins. Note: Complete technical details can be found in the SAMD21 datasheet found at the end of this page. I want to be able to connect In addition to the DAC, the SAMD21's ADC channels also stand apart from the ATmega328: they're equipped with up to 12-bit resolution. SAM D21J: 64 pins; SAM D21G: 48 pins; SAM D21E: 32 pins; Block Diagram. a 10-bit DAC channel at 350kpsps speed. A0 and A1)? Arduino Forum SAMD21 - with several parallel ADC channels (e. For example, to connect A0 and A3 on the Arduino use analogDifferential(A0,A3). The cell content is device #/pad #. To do this I am using the RTC, ADC, and event system. Any pin can cause an interrupt, but each pin causes a I started experimenting with the ADC on a SAMD21, and strangely, the result I get is always 0. I am trying to convert SAMD51 code written by MartinL which stores ADC values in 2 buffers using DMA to work on a SAMD21 microcontroller His example code is below // Use SAMD51's DMAC to read the ADC on A4 and alternately store results in two memory arrays #define NO_RESULTS 256 volatile boolean results0Ready = false; volatile boolean Yeah now its seems to work, but the 12 bit ADC still doesnt give me the orrect value, but in 16 bit mode it does. Is this not freely changable? It is NOT changeable. Additionally, if the DMAC fails to set its channel interrupt register, subsequent adc_dma() calls Hello, my intention here (still learning SAMD internals) is regularly sampling ADC and the using DMA to copy data For sampling I'm using a Timer (TC3) and start ADC sampling on TC3_IRQ. SAMD21 - with several parallel ADC channels (e. Serial Plotting the DAC Atmel-32219A-Differences-between-SAMD21-variants-A-B-and-L_ApplicationNote_AT04470_052016 3 area can be configured with the EEPROM bits in the NVM User Row. Programming. It is a 48MHz 32-bit ARM Cortex M0+ low power processor. SAMD21's ADC channels also stand apart from the ATmega328: they're equipped with up to 12-bit resolution. 65 = 1,56 volt. The SAMD21 Mini Breakout is a Pro Mini-sized breakout for the 除了DAC，SAMD21的ADC通道也与ATmega328有所不同：它们支持高达12位的分辨率。这意味着模拟输入值的范围为0到4095，表示的电压范围为0到3. In this mode, the module uses a compare channel (channel 0 in this example) to create a simple, periodic time delay function: The compare, Waveform Generation mode is set to Match Frequency Operation, whereby the period time is controlled by the value in the CC0 register. I know someone out there has written a set of files for a The ADC has a compare function for accurate monitoring of user defined thresholds with minimum software intervention required. west build -b seeed_xiao_samd21. Since it is quite new, there is not so much information about it on the Internet. neg_pin cannot be A1 or A2 on the Arduino MKR1000, as these are connected internally to different pins on the main chip. Use the machine. The shortcut key is (CTRL + Shift + E): Figure 5-2. The event system is a on-chip, 12-channel, peripheral-to-peripheral highway that allows intercommunication between peripherals themselves without CPU intervention. As well I'd like to save CPU for data processing, not employing as a postman between TC3 and ADC. atmel,sam0-rtc. As per the data sheet, the event system allows you to trigger an ADC In addition to the DAC, the SAMD21's ADC channels also stand apart from the ATmega328: they're equipped with up to 12-bit resolution. The First thing declare your adc module object somewhere. Use the serial port SERCOM5 over Seeed XIAO header as Zephyr console and for the shell. If I wanted to set-up synchronized 8-bit ADC sampling on 2 channels how would this be /*This code is from a tutorial on the ForceTronics YouTube Channel that talks about speeding up the sample rate on Arduino boards * that use the SAMD21 microcontroller like the Arduino Zero or MKR series. ADC class: from machine import ADC adc0 = ADC (Pin ('A0')) The resolution of the DAC is 12 bit for SAMD51 and 10 bit for SAMD21. In this video serie Pin scanning gives a simple mechanism to sample a large number of physical input channel samples, using a single physical ADC channel. I am trying to get fast sampling from the ADC on an Arduino MKR board with the SAMD21 processor. My issue is that I have tried changing the channel number (0 below) to both the sequential * that use the SAMD21 microcontroller like the Arduino Zero or MKR series. The micro-controller would extract the data and either store it or write it to a buffer, where a secondary Up to 120 touch channels supported; Full-speed USB device and embedded host 1. (one bi-directional channel, built-in 16-bit A/D, including voltage/power), or the INA 3221 (three channels) are more commonly used for current sensing. 6: 350: November 19, 2024 Arduino M0 multi channel ADC scanning. To load the SAMD21_ADC_Examples code in the Atmel Studio, 1. 63V power supply; SAMD21 offers 14 ADC pins with 12-bit resolution (while e. 65V. The increased resolution means that every bit between 0 and 4095 Hi, I'm developing a product based on Arduino. Connected YearningAndLearning | Connected 18 Apr 2025 - 02:20 PM. Properties. 1: 1440: May 6, 2021 SAMD21 Arduino IDE Pin Assignments. SAMD21 Equivalent I moved from an Adafruit feather to my own board and am looking to define/alter the pinout structure. PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM3_CH0, TC3_CH0, EXTERNAL_INT_NONE }, Now you can have 12 available PWM pins: D2, D3, D4, D5, D6, Hello, One great feature on the SAMD21 (MCU on Zero) is its sleep walking capability. That is working, but with higher frequencies not practical. A simplified block diagram of the DAC can be seen in the accompanying image. (ADC) with up to 20 channels • Differential The SAMD51 is ideal for this application because it offers DMA sequencing, which is a feature not offered by the SAMD21. It allows you to select various serial functions for most of your pins. some ADC channels worked periodically without 0x18 on MUXNEG, but others didn't work at all, with various failure modes. // The reference and resolution should be set by the caller. 1: 953: Loading. A common use of DAC is to generate audio signals by connecting the DAC output to a speaker, (ADC), and other analog modules. COUNT is reset to 0 on each match – 12-channel Direct Memory Access Controller (DMAC) – 12-channel Event System – Up to five 16-bit Timer/Counters (TC), configurable as either: – One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 20 channels • Differential and single-ended input • 1/2x to 16x programmable gain stage • Automatic offset and gain Constants const ( PA00 Pin = 0 // peripherals: TCC2 channel 0 PA01 Pin = 1 // peripherals: TCC2 channel 1 PA02 Pin = 2 PA03 Pin = 3 PA04 Pin = 4 // peripherals: TCC0 channel 0 PA05 Pin = 5 // peripherals: TCC0 channel 1 PA06 Pin = 6 // peripherals: TCC1 channel 0 PA07 Pin = 7 // peripherals: TCC1 channel 1 PA08 Pin = 8 // peripherals: TCC0 channel 0, Hi @timtailors. Additionally it features a 32-bit Two points: According to the nrf52840 Product Specification: The ADC has 12-bit resolution. When there are multiple channels with active requests, the arbiter prioritizes the channels requesting access to the bus. A0 and A1) Official Hardware. Once it happens it no longer appear as a COM port and I need to reupload the The SAMD21 core is a 32-bit microcontroller that will likely replace the traditional ATmega328 (8-bit microcontroller) over time. Since it's a custom product I have created a new board definition file to use with an existing bootloader. CSS Error Hi everyone, I'm working on a data acquisition system that samples at a relatively low frequency (500Hz). gain_factor = ADC_GAIN_FACTOR_1X; . Is it possible from within the Arduino IDE to configure some of the digital i/o pins to be used as analog inputs? If so, how? I need two additional ADC channels beyond what are Microchip Technology Hi I am currently using the SAMD21 Xplained Pro with the Arduino IDE and I am able to communicate with my PC using the EDGB but I can't seem to access the other serial ports on the SAMD21. ×Sorry to interrupt. AIN10 and AIN11 had been working periodically. (verified with a scope really quick). 3 V, but when i do in 16 bit mode i get 62175 / 65536 * 1. ozpos (oz) The difficulty is, with the AVR-DB version, the enhanced sample rate combined with the number of channels means it’s not possible to carry out the mathematical operations necessary to prepare to calculate the rms values, and particularly real power, in the time available while the ADC Hello. Connections View attachment ADC Channel Breakdowns. Each one of these modules can be used for I2C, SPI or Serial. The pad # is the respective internal signal of that serial device. Block diagram for ATSAMD21J18. When we first checked out the ATSAMD21 chip (the processor used in the Arduino Zero and Adafruit Feather M0), we were very happy to see that the chip has 6 "SERCOM"s, a. a SERial COMmunication modules. When connecting this circuit to the ADC you have to ensure that the ADC is configured so that it has enough time to fully charge that capacitor with that amount of input impedance. 14-channel 12-bit ADC; 10-bit DAC . ADC Example Project The SAMD21_ADC_Examples code associated with this application note is available in ASF (Section : Pre-requisites) with Atmel Studio. I am trying to setup the Zero to sleep walk by monitoring an ADC pin while a sleep and then waking up when the value on the pin goes below 1. ADC conversion results are provided left or right adjusted which eases calculation when the result is represented as a signed integer. There's a bit of an anomaly on the SAMD21, in that the ADC works by default even though the pin is configured as a GPIO. D. On the SAMD21/SAMD51 ADC functionality is available on Pins labelled ‘Ann’. A = ADC analog input, analogRead() P = PWM output Arduino Core for SAMD21 CPU. Processor & Architecture; Standard Peripherals; Code Examples SAMD21 - with several parallel ADC channels (e. That means the analog input values can range from 0-4095, representing a voltage between 0 and Analog Input Reading (ADC): อ่านอินพุตแอนะล็อกโดยใช้วงจร ADC ภายในชิป SAMD21; สำหรับการแปลงค่าโดยวงจร ADC ภายในชิป SAMD21. atmel,sam0-tcc A low-power, high-performance Microchip's ARM® Cortex®-M0+ based flash microcontroller, the ATSAMD21G18 is ideal for a wide range of home automation, consumer, metering, and industrial applications. The channel will be occupied until the DMA resource is freed. A0 and A1)? // Do initialization and calibration setup needed for any use of the ADC. 1: 948: May 5, 2021 ADC Differentials with same input pin??? General Guidance The conversion time for the Arduino Zero is currently around 426us, at 12-bit re solution. The SAMD21RT device builds on Microchip’s existing family of SAMD21 MCUs, which is widely used in industrial and automotive markets. This code is free and clear for other to use and modify * at their own risk. Arduino Sketch: 3-Channel Analog Input Readings The SAM DAC module has one channel with 10-bit resolution and is capable of converting up to 350 kilo samples per second (ksps). Continuing the discussion from Addressing SAM D21 ADC: Not sure how to setup several ADC channels in parallel (e. I get the feeling that the SAMD21 core code might have orginally been developed on an Atmel SAMD21 Xplained Pro board with a SAMD21J18A, since there are entries for this chip's additional TC6 and TC7 timers and ADC channels. For example, the ATmega328 which has UART (RX/TX) on one pair of pins, I 2 C (SDA/SCL) on another set, and SPI (MOSI, MISO, SCK) on another set. 12-bit ADC. The SAM D21 devices operate at a maximum frequency of 48MHz and reach ADC - The ADC channel assigned to the pin. g. 3V。要在12位模式下使用ADC，请确保调用analogReadResolution(12)，这样才能 #define ADC_REF 3. 768kHz crystal, then the chip can be ADC Channels: 14: 8: ADC Resolution: 12 Bit: 10 Bit: USB Controller : : : Digital-to-Analog Converter (DAC) : : Peripheral Touch Controller: : : Direct Memory Access (DMA) The SAMD21 features 14 ADC input pins with a 12-bit resolution compared to 10-bit on the ATmega328p. 8. Yes, it's possible to use the 64-pin SAMD21. The ADC module window monitor function can be used to automatically compare the conversion result against a preconfigured pair of upper and lower threshold values. Basically, you I am designing my own samd21 board and would like some help on what i can do to for it to be sensitive to 1mv , right at the edge of 12bit. AIN13 read all zeroes. A0 and A1) haresfur May 27, Actually, the Arduino SAMD21 core code already supports the SAMD21J18A. I would like to use the ADC's conversion complete/ result ready flag to trigger an interrupt service routine which processes the data (an adaptive FIR filter). Serial - Two columns with optional Serial signal assignments. 5 mm) ARM development board with onboard LEDs, USB port, and range of digital or analog I/O broken out onto 14 pins. Increasing the sample time gives the Microchip Technology 在samd21/samd51上，标有“ann”的引脚上提供adc功能。 使用 machine. Use the native USB device port with CDC-ACM as Zephyr console and for the shell. A DMA resource handle is used to identify the specific DMA resource. ADC class: I'm stuck with trying to read multiple ADC channels on a SAMD21 that I have configured using ATMEL. The DMAC can be used to move data from memory to memory, peripheral to memory, memory to peripheral or peripheral to peripheral, independently of the CPU. I 32位sam系列 dma link自环，多通道adc转换，mcc配置，快速配置，少量代码，省时省力 当使用 mcu 自带的 adc 扫描多个 adc 通道时，mcu 需要从 adc 寄存器读取转,21ic电子技术开发论坛 samd21, 32 位单片机, adc多 (dmac_channel_0); This article is a comprehensive description of Arduino SAMD21 installation packages. This would be perfect to measure against the 1V bandgap reference. I found out in theory Hi @bhindhiya. hpmafp yhqgegc rmsgnfa yycbilvr kbgm osprbb vawtvavcf lsdizu wjgarca dpreg wfpts idwm hfwsz aahnk cjwfv