Spi Serial Flash Programmer Schematic Design
A Simple Serial (I2C/SPI) EEPROM Programmer Posted on 23rd December 2014 Tagged in electronics, tools, tgl6502. This is a small ATtiny84 based device to program I2C and SPI EEPROM chips over a serial port. As usual all code and schematics are available in GitHub. This is called programming, and is typically done with a much higher voltage. It actually damages the material, and after 100k program cycles, the gate will fail. † Indirect SPI flash programming using the ISE Design Suite iMPACT tools. Memories use a 4-wire synchronous serial data bus. The SPI flash configuration.
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SPI Flash Microcontroller Programmer Ver 3.7 Introduction This SPI Flash Programmer can be used either for in-system programming or as a stand-alone serial flash programmer for the Atmel SPI programmable devices. The programmer hardware interface is controlled by the PC parallel port and the parallel port control signals are freely selectable by the user. The software supports both the 8051 and AVR series devices. Hardware Figure 1 shows the circuit diagram of the SPI Flash programmer hardware interface, the power to the interface is provided either by programmed device. The 74HCT541 IC buffer the parallel port signals. It is necessary to use the HCT type IC in order to make sure the programmer should also work with the 3V type parallel port. Shematic is given below and here is high quality shematics in PCB layout with component placement and here is high quality version in PCB tracks wor PCB development and here is high quality version in Software The SpiPgm37.zip file contains the main program and the io port driver.
Place all files in the same folder. The main view of the program is shown in figure 3. Also make sure do not program the RSTDISBL fuse in the AVR series devices, unless it is necessary otherwise further serial programming is disable, to restore the serial programming a high voltage parallel programmer is required. For the fuses setting consult the datasheet of the respective u-controller.
Designing with discrete flash is 1/10th the cost, uses a much smaller form factor, and requires significantly less specialized hardware than using SD flash cards. This Instructable will show you how to add 1MB of discrete external flash memory to your microcontroller project with what I believe to be the least amount of effort possible.
This is also a follow-on to my other two data-logging Instructables (an and a ) that explains how to download the data from the logger flash memory using age-old TTY command line applications found in Linux. Motivation Whenever I'm building an Atmel ATMega or Arduino project and I need to record data, I almost always reach for a single rather than an SD flash subsystem. Many reasons exist to choose a discrete flash chip over an SD subsystem, and vice versa, and you'll need to consider these tradeoffs for your design. The list below contains a few tradeoffs I think about when I need to decide if I want to use a single 8-pin DIP chip or a full-on SD solution: Hardware Complexity (Choose: Discrete) One way to add SD flash to an Arduino system is to use a shield, such as (three 'e's) I bought at my local Radio Shack for $15. While shields provide convenience for prototyping, the final production assembly might not have the budget or the space to include SD hardware. An 8-pin DIP package of a discrete flash chip is much easier to drop on a protoboard than an SD shield, assuming your development board even supports a shield.
Software Complexity (Choose: Discrete) The SD flash subsystem commonly relies on. While the devices are an SPI interface, it makes sense to use FAT since any PC/MAC can then read this card. These libraries are large and can take up precious EEPROM space on smaller embedded controllers. Compatibility and integration into your build environment may require significant debug. The software required to drive a discrete flash chip with an SPI interface is trivial and very small, as you will soon see.
Maybe this says more about me than the SDFat libraries, but I find them cumbersome to work with. Capacity & Portability (Choose: SD) SD flash wins big here, simply pop in a larger capacity SD card into the existing design with no modifications. Discrete SPI flash has lower density limits in the 8-pin DIP format. The SDFat library means any PC/MAC can read the files on the card.
Cost (Choose: Discrete) SD cards range in price dramatically, and with an SD flash shield, can set you back $20-$30. WinBond 1MB chips cost about $2 from Mouser or Digikey.
Power (Choose: Discrete) Energy requirements of flash depend on the manufacturer, production lot, device density, and process technology. SD cards are typically higher leakage power due to the higher densities, and higher dynamic power due to the higher access speeds. The WinBond chips I focus on in this Instructable require very little power, 6uW standby, 60mW page program, and 60mW chip erase. I wasn't able to find power data on the high-end super-fast SD cards, but the write speed is about 100x that of the WinBond. Since dynamic power is proportional to frequency, I can't imagine power would be less. Speed (Choose: SD) I haven't had any need for very fast flash memory write performance, but SD flash comes in many different product SKUs based on speed (mostly due to the demands of digital photography and the use of raw image formats).