I have a blackfin 533 and I connect it with external flash memory.   I have a software driver that erases a block, fills data, write to flash memory.  I'm using the following chip ST M29W800D.   How would I test and verify the flash that's working ?   Should I earse it, fill it with data and read it ? but how would I erase it, and I'm running the software that is checking the correctness of the flash eeprom ?
121118
I'm using blackfin533, and I would like to write a software for flash memory testing. How would I test the flash memory ? I know how to test an eeprom but how would I test the flash memory of the blackfin533?
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I have zero experience with flash and want to learn how to use it from zero, for example by following the Strobist blog.  What are the absolutely necessary specifications I should look for when shopping for a flash, and can I find something in a price range less than $200.00?  My camera is a Nikon DSLR.
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Most of the interface devices have various flag bits (that can also raise interrupts if that functionality is provided) used to check the status of the device/operation.  Usually they are cleared by writing a '1' to said bit.  Just some questions regarding this ...   Why are they cleared by writing a 1? I mean if the flag is already set to 1 by the device, won't it make sense to clear it by writing a 0 to it? Lets say i have a 8 bit status register with bits distributed as (picked from datasheet of NRF24L01+)     If bit 5 (TX_DS) gets set (ie. turns to 1) and I want to clear it by writing 1 to it, what value do I write to the register.
110297
I have a Canon 5DMk2 and have just bought 2 Yongnuo YN568EXII speed lights. I have an existing Yongnuo RF-603CII trigger, but I cannot get them to work together! Does anyone have any suggestions, as the manual is no use :( Thanks Steve
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I got the  in order to interface with an I2C peripheral through a USB port on my Windows 7 computer.  The VCP drivers seem to install correctly, and a COM port is assigned to the module, and can be opened by a terminal emulator. However, I cannot seem to get any signal in or out of the module. That is, I see no activity when I send data through the port, or receive any data when I connect an I2C device to it (this was debugged using a scope). I have also verified that the RESET isn't on.  I found very little helpful information out there on how to get this module to work, so if anyone has experience with it, or with similar FTDI modules, my question is: what are the steps that I need to take in order to get the module to communicate?
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I'm trying to protect whole flash from reading through ISP. It has bootloader, able to self program application section.   Setting lock byte to:   LB1/LB2 will not let user to use bootloader to upload new firmware.   BLB12/BLB11 and BLB01&amp;BLB02 will not prevent reading flash through ISP, if I am not mistaken.   So there is no way to let user update firmware by custom bootloader and protect flash from reading at the same time?
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I have a Sandisk Cruzer 16GB USB flash drive, but it started to show up as 16MB. And I can't use it, it tells me that I need to format the drive or Please insert a disk into drive X. What software do I need to check the flash drive?  I can't format it since the format fails, and it shows as 16MB instead of 16GB.
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The external Flash is not showing up in the configuration Menu when using Pixel TF-321 hot shoe. Is this the wrong adapter for that camera, as there is no X connection? I want to trigger a studio flash via sync connection. Can you recommend me a working hot shoe? Thanks!
99295
I'm trying to repair the logic board of an LCD monitor that died while giving off a burned smell.  It seems that an LCD driver chip and a MOSFET (I think) burned out. The chip was easy to identify () and order, but I can't unambiguously identify and find a replacement for the other part.  It is labeled "540N 88KFG" and I think its form factor is TO-252 / DPAK. Below is a photo, there are three of them in the middle of the picture.  A related question is what characteristics I have to make sure to match if I can't buy an exact replacement. Searching around for "540N" MOSFET, I found some in other packages whose main data points were   100V source-drain voltage 33A current rating.   If those do indeed apply to this component as well, what else needs to match in a replacement?  Update: After looking around a bit longer it appears that  might be a reasonable replacement.
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From :     BIOS software is stored on a non-volatile ROM chip on the motherboard. ... In modern computer systems, the BIOS contents are stored on a flash memory chip so that the contents can be rewritten without removing the chip from the motherboard. This allows BIOS software to be easily upgraded to add new features or fix bugs, but can make the computer vulnerable to BIOS rootkits.   Since ROM means Read-Only Memory,  why can the BIOS contents be rewritten?  Does the "flash memory chip"  mean the same as the "non-volatile ROM", both meaning where BIOS is stored?
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On Linux, given:    a device, for example /dev/sda,  and its major and minor numbers, for example 8, 0,    how can I know which module / driver is "driving" it?  Can I dig into /sys or /proc to discover that?
105463
I have problems transferring binary programs to a micro-controller prototype board when using ubuntu/kubuntu to mount the board via usb. With MacOS and Windows there are no problems. I have found the writing from Ubuntu definitely changes the written file. I suspect that the write caching is the problem. How can I disable it, or what else might be the problem.
23287
I've recently finished programming the STM32F429ZI DISC1 board. I'm fairly new to this and now want to move away from connecting it to the PC via USB and power it up via a power supply.   At present I have connected a 5V supply to the 5V pin. This seems to power the board fine in that the LCD screen comes on (blank white), the PWR LED(LD2) lights up. However my program fails to initialise and stays blank, the COM LED(LD1) also flashes red at 1hz approx.   Has anyone experience with powering this board or other STM32 boards without a USB connection? And if so which Pin did you connect to and with what voltage.
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When running Linux i am able to use SP flash tool to do a readback from my mediatek device and do a full backup of the rom images while the device is in preloader mode, without the use of any additional USB drivers. Yet this is not possible with Google Pixel. Is this perhaps due to Mediatek going out of their way and adding support for their devices during the development of the mainline linux kernel and Google dont?
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I am looking for an explanation what that component does inside of that circuit.  It can be found on page 3 of the Datasheet of ADP5091:   It would help me out a lot. Thank you in advance!
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I was reading about . How would this be done? The post talks about a 'looped mode' and comments suggest having a different controller to lie to the OS.  I went and bought one of these devices, tried it and it worked as advertized (overwriting data when it was full), although when I formatted it, it started showing its 'true' capacity.  How is this achieved?
122035
I have a problem with an I2C communication and want you to ask whether there is a better solution than mine.  I am programming an STM32F103 at the moment. There is one sensor (MPU6050) which is connected via I2C to the STM32. I recognized that if I reset the STM32 a few times, the STM32 gets stuck (or got an timeout error) during the initialization of the I2C. The timeout error was during the wait of the busy flag. So the I2C communication was "occupied". The MPU6050 is the only other I2C device (slave).  In my opinion there is an error, because I was reading a register from the MPU6050 when I reset the STM32. So the MPU6050 never gets the stop condition.   I do not know how to reset the I2C connection, when the bus is "occupied" (by the MPU6050). So my solution would be to do a hardware reset with a transmission gate of the MPU6050. Is there maybe a simpler software solution?  Thanks for the help.