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
In your opinion is better the raspberry pi or ch341a to reach my goal?
Should I buy a breadboard for create better connections ?
Can you draw a schematic that I can follow?
Il 6 mar 2018 21:55, "Nico Huber" nico.h@gmx.de 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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Luca Bacci Bonotti -
Nico Huber