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Another potential XDMAC cache coherency issue
Hi,   It seems I'm up against yet another cache coherency issue on the SAME70, this time with a (relatively) simple UART RX transfer operation.   To summarise the setup...
Thursday, 29 July 2021 - 23:41
Constant Bus Errors
Hi,   I have an XDMAC RX operation on a SAME70 which receives UART data from a peripheral device. The length and format of the UART data is known and fixed, so parsing of the...
Tuesday, 6 July 2021 - 01:15
Unable to access XDMAC RX buffer data
Ok this is a weird one. Or I'm completely missing something, which is far more likely.   I have an XDMAC SPI RX operation setup for reading data from an ADC; the XDMAC...
Sunday, 27 June 2021 - 23:52
Fastest Linux user space GPIO access
Hi,   I've previously used sysfs for basic access to the GPIO from user space applications within Linux. The sysfs approach is now deprecated in favour of libgpiod, which I'...
Tuesday, 22 June 2021 - 23:25
XDMAC handler setting
Hi,   I'm using XDMAC functionality across a number of classes. E.g. for SPI TX in Class A, UART RX in Class B, etc. Is there any way to define the XDMAC interrupt handler...
Friday, 4 June 2021 - 00:22
SAM Timer Counter Inaccuracy
Hi,   I'm conducting some testing of a TC-based interrupt routine, whereby I'm looking to call a function at specific intervals ranging from 1Hz to over 1kHz.   I've...
Wednesday, 2 June 2021 - 00:27
SAME70 - Reducing consecutive SPI transfer delay with XDMAC
Hi,   I'm interfacing a SAME70 with an ADC with SPI. The ADC has a couple of different operating modes, the mode I'm using allows the ADC to cycle through and convert each of...
Tuesday, 25 May 2021 - 09:22
SAME70/SAMV71 GPIO pin source current
I feel like I've read through the datasheet multiple times now looking for this, but can anyone point me to the GPIO source/sink capabilities of the SAME70/SAMV71? I'm trying to...
Wednesday, 9 December 2020 - 23:08
2-wire potentiometer ADC input protection
Hi,   I'm working on an ADC circuit and am trying to account for user error when connecting sensors to the circuit. The inputs are designed to interface with 2-wire, passive...
Wednesday, 2 December 2020 - 09:59
SAME70 CAN - Clarifying watermark, put/get indexes and batch processing
Hi,   I've got an ASF3-based CAN framework working on a SAME70Q21. At the moment I trigger an interrupt on each 'new message' FIFO RX message receipt, which works as intended...
Thursday, 19 November 2020 - 22:48
Basic CAN FIFO clarification
Hi,   I'm looking to clarify MCAN operation on the SAME70 based on the example code I've reviewed and the CAN section in the datasheet. The datasheet specifies two FIFO...
Thursday, 29 October 2020 - 00:07
SAME70Q21 ASF CAN Example
Hi everyone,   I'm trying to get a very basic CAN setup working with a SAME70Q21. Unfortunately it seems that ASF doesn't have a basic CAN example for the SAME70 (although it...
Wednesday, 7 October 2020 - 21:25

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