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Multiple reset causes at the same time?
I have a custom board with ATSAML21 and sometimes I detect a reset. The reset cause byte is 0x22   #define RSTC_RCAUSE_OFFSET 0x00 /**< \brief (...
Tuesday, 10 April 2018 - 12:48
Powering SAML21 from 3.6 battery and voltage drops
Hello! I'm creating a device where the battery replacement is an issue. The device is a temperature sensor, a SAML21 uC and a Sigfox module.   The uC wakes every n seconds,...
Wednesday, 14 March 2018 - 18:12
What are the best practices for WDT and BOD in low power mode?
Hello!  I have a low power project with a SAML21 powered by 2 AA cells. The mcu wakes up every 2 seconds to measure, and in case of a change of state, transmit data to my...
Tuesday, 20 February 2018 - 14:31
FATFS+AT45: at45dbx_mem.h no such file
I'm trying to mount a fat filesystem on a custom board with an AT45DBX memory chip. The uC is ATSAMR21E18   There is no example on FATFS+AT45DBX, only USB or MMC. If I open...
Tuesday, 2 May 2017 - 20:37
FatFS + Virtual Memory in RAM
Hi!   I'm trying to test the FatFS in a virtual memory disk with SAMD21 Xplained pro. I found no example on Virtual Memory ASF module but found FatFS with MMC. So I modified...
Tuesday, 25 April 2017 - 20:59
50 ohms using power plane instead of ground plane?
Hello!    I have several boards with 50 ohm traces in 4-layer pcbs. my stack layer is usually top, ground, power, bottom. The 50 ohms traces should be in the top layer...
Wednesday, 29 March 2017 - 20:59
how to choose wisely the interrupt priorities?
Hello!   I'm working on a project that uses lot of hardware: four serial ports, one spi, one i2c, 5 ADC inputs. What I want to know is the right way to choose the priority of...
Monday, 30 May 2016 - 00:30
Printing special characters in a terminal window
Hello!   I'm having some issues printing special characters via serial port. Same happens with tera term and putty. When I try to print special characters such as ñ, ¿,...
Wednesday, 13 April 2016 - 15:24
usart callback on RX not firing
Hello!   This is my first post in ARM. I have some experience with AVR and now I'm trying for the first time an ARM Cortex M0 (ATSAMD20J18).    I started a new...
Thursday, 10 March 2016 - 21:45
solderable micro-sd?
Hello!   I need to use some flash storage in a corte-m0 uC. I want to use ASF to create a filesystem and forget about designing the driver for a flash memory. ASF supports...
Thursday, 17 December 2015 - 22:18
Literature for state machines in GSM comm modules
Hello!   I'm working on several projects with simcom modules (AT commands, cell phone and TCP / UDP). They are all working fine, but I want to learn more about state machines...
Friday, 11 December 2015 - 15:26
designing my own SAMD20J18 board
Hi!    I'm about to explore this uC. I have the xplained pro board working and I was able to blink a led. I've also ordered some D20J18 chips to try to make my own board...
Tuesday, 15 September 2015 - 03:16

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