OT: plug and pray webcam on windows xp

Started by Dimiter_Popoff in comp.arch.embedded2 weeks ago 2 replies

Moments ago I posted this only to SED, then remembered the chances someone could help here are perhaps higher (unless the groups...

Moments ago I posted this only to SED, then remembered the chances someone could help here are perhaps higher (unless the groups overlapp completely nowadays....). Anyway, separate post but same, here it goes: A somewhat moronic question but well, perhaps someone has been there and done it. My old (also external) webcam which I use in order to look at my lab when I am not there (USB connec...


4 Bit MCUs, Still Alive and Kicking?

Started by Rick C in comp.arch.embedded2 weeks ago 28 replies

I'm not sure which group it was in, but someone who designs toys talked about the extremes they would go to for cost reduction, removing useful,...

I'm not sure which group it was in, but someone who designs toys talked about the extremes they would go to for cost reduction, removing useful, but not essential resistors because they were $0.001 each. I'm trying to find out if there are still 4 bit MCUs used in new products. I see a number of companies who make them, but I have no pricing. I have found 8 bit MCUs that are a


LWM2M C Language Implementation for the Small Embedded IoT Devices

Started by Anonymous in comp.arch.embedded3 weeks ago 5 replies

Hi group! As a n00b in the IoT domain I have had trouble finding a suitable open source implementation in C for the LWM2M protocol with DTLS...

Hi group! As a n00b in the IoT domain I have had trouble finding a suitable open source implementation in C for the LWM2M protocol with DTLS support. What I have found so far are following implementations: - Contiki lwm2m: https://github.com/sics-iot/lwm2m-contiki - Wakaama LWM2M: https://github.com/eclipse/wakaama - Awa LWM2M: https://github.com/FlowM2M/AwaLWM2M - Anjay: https://gi


4-bit MCUs

Started by Rick C in comp.arch.embedded3 weeks ago 10 replies

Wow! This group seems to have all but died. It used to be very vibrant. I'm trying to determine how prevalent 4-bit MCUs are in the world. ...

Wow! This group seems to have all but died. It used to be very vibrant. I'm trying to determine how prevalent 4-bit MCUs are in the world. I know lots of products have used 4-bit devices in the past, coffee-makers, remote controls, microwave ovens, etc. I believe at one time, in terms of raw quantity, they outnumbered every other sector. But I don't find very many at mai


eMMC CSD Register ECC field

Started by Buzz McCool in comp.arch.embedded4 weeks ago 1 reply

Anyone here knowledgeable about eMMC memory? I have a high reliability application where there is concern about memory corruption. What would...

Anyone here knowledgeable about eMMC memory? I have a high reliability application where there is concern about memory corruption. What would happen if I changed the ECC field in the eMMC's Card Specific Data (CSD) register from the default no ECC to the optional BCH(542,512) encoding? Would I still be able to write/read new values to the eMMC normally with the eMMC internally protectin...


USART interrupt on transmission

Started by pozz in comp.arch.embedded2 months ago 4 replies

The UART/USART peripheral usually available in many microcontrollers triggers a few interrupts. Two of them are DRE (data register empty, as...

The UART/USART peripheral usually available in many microcontrollers triggers a few interrupts. Two of them are DRE (data register empty, as named in AVR documentation) and TXC (transmitter complete). The first can be used to feed the TX FIFO even during shifting out the last pushed data. Documentation usually lacks details on these interrupts, for example exactly WHEN they are trigg...


First CFP: 18th International Conference on Information Assurance and Security (IAS 22) - Online - Springer Publication

Started by Anu Bajaj in comp.arch.embedded3 months ago

** First Call for Papers - please circulate this CFP to your colleagues and networks ** -- 18th International Conference on Information...

** First Call for Papers - please circulate this CFP to your colleagues and networks ** -- 18th International Conference on Information Assurance and Security (IAS 2022) -- http://www.mirlabs.org/ias22 http://www.mirlabs.net/ias22 * On the World Wide Web * December 13-15, 2022 Proceedings of IAS'22 will be published with Springer Verlag in their Lecture Notes in Networks and...


MCU reset and internal SRAM starting values

Started by pozz in comp.arch.embedded3 months ago 2 replies

I often use with success a simple way to implement a bootloader: #define START_MAGIC 0xAA55AA55 uint32_t start_application...

I often use with success a simple way to implement a bootloader: #define START_MAGIC 0xAA55AA55 uint32_t start_application __attribute__((section=".noinit")); void main(void) { ... if (start_application == START_MAGIC) { start_application = ~START_MAGIC; launch_application(); } /* Stay in bootloader and wait for new application from * USART, SPI, USB, wha...


gcc: NOLOAD and .noinit

Started by pozz in comp.arch.embedded3 months ago 7 replies

I usually don't touch linker script of my development system, sincerely I can't read every details of a linker script, so I'm in trouble...

I usually don't touch linker script of my development system, sincerely I can't read every details of a linker script, so I'm in trouble now. As explained in my previous post, I need to avoid zeroing a static big variable, because it is allocated in SDRAM and SDRAM isn't available when zeroing of bss sections (and initialization of data sections) occurs. My development system allows me...


gcc ld and bss sections on SDRAM

Started by pozz in comp.arch.embedded4 months ago 4 replies

My platform is LPC546xx, Cortex-M4 by NXP, and the build environment is based on GCC ARM toolchain (MCUXpresso IDE). However the question is...

My platform is LPC546xx, Cortex-M4 by NXP, and the build environment is based on GCC ARM toolchain (MCUXpresso IDE). However the question is generic. The default linker script instructs linker to put bss sections (zero initialized data) in internal RAM. During startup, before main, bss sections, described in a table on Flash, are reset to zero: __attribute__ ((section(".after_vecto...


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