Thanks a lot. I'll try and I'll let you know. Il 6 mar 2018 23:13, "Nico Huber" <[email protected]> ha scritto:
> On 06.03.2018 22:13, Luca Bacci Bonotti wrote: > > In your opinion is better the raspberry pi or ch341a to reach my goal? > > I don't know. I doubt it makes much of a difference. If one fails, you > can try the other. Though, the RPi is much faster. > > > > > Should I buy a breadboard for create better connections ? > > Better than what? > > > > > Can you draw a schematic that I can follow? > > Sigh, I guess I can. > > Programmer SPI Flash > > /CS ------------ /CS > > MISO ---50-Ohm--- MISO > > GND ------------ GND > > MOSI ------------ MOSI > > CLK ------------ CLK > > VCC ------------ VCC > \ > `-10kOhm--- /WP > \ > `-10kOhm- /HOLD > > This is about the minimum setup I'd use for a plain (unsoldered) > chip. Resistor ratings may vary. > > Nico > > > > > Il 6 mar 2018 21:55, "Nico Huber" <[email protected]> ha scritto: > > > >> Hello Luca, > >> > >> On 06.03.2018 07:25, Luca Bacci Bonotti wrote: > >>> I tried with chip soldered and unsoldered. Same results. > >> > >> same results? probably due to very different problems. Especially when > >> the chip is not part of a circuitry (that might already take care), you > >> have to connect all input pins of the chip. Also, very often, a series > >> resistor at least on the MISO output is required. > >> > >>> I previously tried programming with raspberry PI but it was unable to > see > >>> my chip. > >>> I have both CH341A and Raspberry Pi. > >> > >> When you use the Raspberry Pi, make sure you set the `spispeed` parame- > >> ter of linux_spi to something reasonable (I'd start trying around 1000, > >> i.e. 1MHz), the default is OS dependent and often not reliable. > >> > >>> Where should i connect /HOLD /WP on the CH341A ? > >> > >> /HOLD should be pulled up towards VCC (i.e. using a series resistor, > >> 10kOhm maybe), state of /WP usually only matters when the chip has some > >> write-protection set up, so either pull up towards VCC or down towards > >> GND (if in doubt, up). > >> > >> Nico > >> > > > >
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