Optimize pow() function

Started by pozz in comp.arch.embedded23 hours ago 36 replies

I have to convert voltage measure (Volt) into power (Watt). As you know, the physics says I need to square the voltage measure. I have to...

I have to convert voltage measure (Volt) into power (Watt). As you know, the physics says I need to square the voltage measure. I have to calibrate the mathematical law and I have two points: 0W -> 0V -> That could be enough, but we noticed a different relation between volt and watt at intermediate points. I, as the software engineer, have to


Does GCC use single-precision FP hardware on Cortex-M4 parts?

Started by Dave Nadler in comp.arch.embedded1 day ago 7 replies

Hi - Can anybody tell me for what, if anything, does GCC use the single-precision hardware floating point units on some Cortex-M4 parts? At all?...

Hi - Can anybody tell me for what, if anything, does GCC use the single-precision hardware floating point units on some Cortex-M4 parts? At all? Single-precision float only? Presumably not double? The PIC32MZ EF series parts have hardware double precision; presumably GCC uses this for double? Thanks! Best Regards, Dave


Memleak in basic system

Started by wimpunk in comp.arch.embedded3 days ago 14 replies

Hi, I'm stuck with a nasty problem. I'm running an 4.4.13 based kernel with a busybox on an ARM-system but it seems to leak memory... during...

Hi, I'm stuck with a nasty problem. I'm running an 4.4.13 based kernel with a busybox on an ARM-system but it seems to leak memory... during the working hours. I know it is not the best way to do but I've monitoring the MemFree value from /proc/meminfo and I'm losing 2M/hour. It's not that big but having 100M memory free makes it crash after two days. Or at least what I think makes it...


Relay will not open (but will close)

Started by John Speth in comp.arch.embedded5 days ago 9 replies

Hi Folks- I'm hoping some experienced EEs in the group can help me with a problem I'm having with a circuit using Kemet EC2-12NU miniature...

Hi Folks- I'm hoping some experienced EEs in the group can help me with a problem I'm having with a circuit using Kemet EC2-12NU miniature signal relays, a low voltage relay. The switch will reliably close when the coil is energized. The switch will open about 50% of time when the coil is de-energized. There is no delay effect where it might open shortly after the coil is de-energi...


Looking for Xilinx HW-130/HW-120 Adapters

Started by Tim Regeant in comp.arch.embedded1 week ago 1 reply

Bump. Still looking for these adapters. Please contact me if you have any. Thanks. On 8/31/2016 12:10 AM, Tim Regeant wrote: > My...

Bump. Still looking for these adapters. Please contact me if you have any. Thanks. On 8/31/2016 12:10 AM, Tim Regeant wrote: > My project needs to program a Xilinx XC7336 44PLCC. > > I have the software now and the HW-130 programming unit. > > Also have the HW-137-PC44/VQ44 adapter which I assumed would work with > the XC7336, but as it turns out it does not. > > So I nee


XC8 novice question

Started by rwood in comp.arch.embedded2 weeks ago 52 replies

Novice question using MPLABx + XC8 If i define my_variable using; #define my_variable 0b10000000 And then I use it in a function...

Novice question using MPLABx + XC8 If i define my_variable using; #define my_variable 0b10000000 And then I use it in a function that expects a 'char'; void my_function(char i); I get a compiler warning; warning: (752) conversion to shorter data type By changing the function prototype to expect an 'int' the warning goes away so I think the defined my_variab...


USB device bootloader: which method do you prefer?

Started by pozz in comp.arch.embedded2 weeks ago 16 replies

I'm designing a small electronic gadget with a USB device port. Now I'm thinking about a good method to upgrade the firmware through the USB....

I'm designing a small electronic gadget with a USB device port. Now I'm thinking about a good method to upgrade the firmware through the USB. The process should be as simple as possible for the user. I think there are three main method, each one with pros and cons. In all of them, the user should only press a button while the device is connected to the host (so powered up). At startup, ...


Linux embedded plus small TFT: ready-to-use solution

Started by pozz in comp.arch.embedded2 weeks ago 15 replies

I need to develop a product based on Linux embedded (because I need to communicate with a 4G modem through USB and I have the drivers for...

I need to develop a product based on Linux embedded (because I need to communicate with a 4G modem through USB and I have the drivers for Linux). So I'm searching an almost ready-to-use solution for this product (I should minimize design cost even if this increases the price of a single product... I will produce only 10-20 pieces at the moment). The system should have only a USB host p...


Application processor with fast parallel I/O

Started by Theo Markettos in comp.arch.embedded2 weeks ago 25 replies

I'm looking for a Cortex-A class processor that has reasonably quick parallel I/O that might be hooked up to an FPGA. I'm aware of the...

I'm looking for a Cortex-A class processor that has reasonably quick parallel I/O that might be hooked up to an FPGA. I'm aware of the existing Zynq and Altera SoC FPGAs, but looking for something different. By 'parallel I/O' I mean ideally a memory interface - either bidirectional eg 64-bits or separate 32-bit tx and 32-bit rx. GPIO with data valid signals/strobes is another possibility....


SMB/CIFS for uTasker/Coldfire?

Started by Randy Yates in comp.arch.embedded2 weeks ago 21 replies

Hello Folks, I have a need for an SMB/CIFS client for uTasker on a Coldfire MCF52235. I've searched and it doesn't seem to exist. Can someone...

Hello Folks, I have a need for an SMB/CIFS client for uTasker on a Coldfire MCF52235. I've searched and it doesn't seem to exist. Can someone here either correct or confirm? While I'm here, I also would like to ask opinions on using ucLinux instead for this processor. Is it well-supported? It appears ucLinux does have a SMB/CIFS client available. I personally *think* I would MUCH pref...


Registering will allow you to participate to the forums on ALL the related sites and give you access to all pdf downloads.

Sign up
or Sign in