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ATmega644: UART bootloder for a bus
I have a two-wires RS485 multi-slave bus. The slaves are ATmega644-based nodes. Each one has a different address (selected by jumpers) to communicate on the bus with a request/...
Friday, 14 April 2017 - 11:36
D20 and non-blocking Flash programming functions
What happens immediately after issuing an erase/write command to NVMCTRL? The only thing the datasheet says is: INTFLAG.READY will be zero while programming is in progress and...
Thursday, 13 April 2017 - 13:13
SAM D20: is Flash area dedicated to EEPROM emulation RWW?
It's not clear to me after reading SAM D20 datasheet. Is the Flash section that is configured as EEPROM memory (by fuses) of RWW (Read-While-Write) type? In other words, what...
Monday, 10 April 2017 - 11:52
Register syncronization: bus stall, sync loop and so on
I would like to discuss the Register Syncronization topic that is needed for SAM Cortex-M devices. I'm a poor programmer, so my goal is only to understand how to manage registers...
Wednesday, 22 March 2017 - 19:08
C21 Watchdog: syncing is too slow!
I'm trying to use the watchdog peripheral integrated in SAMC21 devices. I started from the example in ASF and I noticed that the function wdt_reset_count() is very, very slow! I...
Monday, 20 March 2017 - 16:45
SAMD21: from external SPI Flash to DAC (simple audio player)
I need to add a simple audio (mainly speech) player in SAM D21 MCU. 8kHz sampling frequency and 8bits for sample is good enough. The total length of audio is too much to use the...
Wednesday, 15 March 2017 - 23:51
IMHO SAM-BA applet for SAMD20 is wrong
I'm trying to reuse the UART SAM-BA Bootloader for Atmel SAM D20 MCU. It is based on a small bootloader stored in the non volatile Flash memory of the MCU and an applet...
Friday, 10 March 2017 - 12:14
SAM D20: OSC32K as the clock for RTC?
Somewhere in the datasheet, I read a typical usage is to configure the RTC to use the clock from OSC32K.   First of all, RTC in calendar mode needs a 1Hz clock, but the clock...
Wednesday, 15 February 2017 - 00:13
SAM D20 XOSC32K.EN32K bit
I'm trying to configure and use XOSC32K with an external 32.768kHz crystal. Its output is used as the source clock for GCLK generator 1. I also configured DFLL48M to use the clock...
Wednesday, 15 February 2017 - 00:02
How to flash Cortex-M0 MCUs, without Atmel Studio
I need to flash the internal memory of some Atmel Cortex-M0 devices (C21) with Atmel-ICE programmer. I would like to avoid installing the entire IDE Atmel Studio. Is there an...
Tuesday, 27 December 2016 - 09:15
Atmel SAM-BA 3.x for SAM Cortex-M
I have seen the new version Atmel SAM-BA 3.1.4 on Atmel web site. Many things have changed (for example, scripting language). I'm working on a new project that uses SAM C21...
Tuesday, 27 December 2016 - 09:03
Fix a broken JTAGICE3
I have one JTAGICE3 that is broken (I think).   Is the schematics and/or parts list avaiable?
Thursday, 20 October 2016 - 09:41

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