Dummy questions from a newbie regarding how to use DMA

Started by pozz in comp.arch.embedded5 days ago 12 replies

Until now I never used a microcontroller with an embedded DMA controller, so I always use the CPU to move data from memory to memory, from...

Until now I never used a microcontroller with an embedded DMA controller, so I always use the CPU to move data from memory to memory, from memory to peripheral, from peripheral to memory. The micro usually have only a two-byte hardware FIFO (the byte currently shifting in and the previous completely received byte). So I often implement a sw FIFO buffer for receiving data from UART. In ...


IC-86 old C compiler for 8086 Intel target CPU

Started by Anonymous in comp.arch.embedded6 days ago

Hello, I am a professional software developer and I need to re-compile an old (> 24 years) C embedded safety critical application running on a...

Hello, I am a professional software developer and I need to re-compile an old (> 24 years) C embedded safety critical application running on a 80186 CPU from Intel and I need to get exactly the same binary code generated with the IC-86 Compiler V4.5 (to keep the validity of the product certification process). I have already found the IC-86 version V4.0 from year 1988, but I really need th


What is your strategy to save non volatile data?

Started by pozz in comp.arch.embedded6 days ago 45 replies

Many times I work on embedded projects where it is required to save some data in a non volatile way. Usualy I use external (to the main...

Many times I work on embedded projects where it is required to save some data in a non volatile way. Usualy I use external (to the main microcontroller) serial/parallel EEPROM or internal Flash memory (with a software layer for EEPROM emulation). However my goal isn't to discuss the hw alternatives, but the data format and strategy. I know there are many serialization data format (X...


DAA suggestions

Started by Don Y in comp.arch.embedded1 week ago 8 replies

Pointers to reference designs for v.90, FAX, etc. to get an idea of what the line interface should look like?

Pointers to reference designs for v.90, FAX, etc. to get an idea of what the line interface should look like?


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Linux and dmaengine - problem with checking the number of bytes transferred in a segment

Started by Anonymous in comp.arch.embedded2 weeks ago 1 reply

Hi, I'm writing a driver for the device, that transferrs data via AXI Stream interface in packets with variable length (however the maximum...

Hi, I'm writing a driver for the device, that transferrs data via AXI Stream interface in packets with variable length (however the maximum length of the packet is known). The data should be transferred to the buffers allocated in the application and accessed by the kernel via get_user_pages. The application allocates a buffer for each packet and submits it to the driver via ioct


Read-While-Write Flash memory

Started by pozz in comp.arch.embedded2 weeks ago 9 replies

Linked to my previous post, here I'd like to discuss another topic related to persistent variables. Some years ago I used microcontrollers...

Linked to my previous post, here I'd like to discuss another topic related to persistent variables. Some years ago I used microcontrollers with internal EEPROM memory or I used external serial I2C EEPROM to save persistent variables. It seems to me the scenario has recently changed. With new Cortex-M microcontrollers, internal EEPROM is typically absent, but the manufacturer explain...


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