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Printer interface to Samsung ARM-7

prasadAradhya prasadAradhya over 12 years ago

Note: This was originally posted on 25th June 2009 at http://forums.arm.com

Hi
I am interfacing the Dot matrix printer (EPSON 1000 series) to an Samsung processor which as ARM - 7 architecture, through Parallel port.
I wanted to print text and graphics. Now i am trying to send text to print and the same i am displaying on the display. On the display the data sent is displayed correctly,
but on the printer it is displaying 'PPPP' some junck even if i am not sending any data, If i press print button, then it self its printing junck characters.
I am not able to understand why its happening.
I am sending ASCII value of a character to printer.
I am writing program in Embedded C.
If any one know please help me.

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Simon Craske over 12 years ago

Note: This was originally posted on 26th June 2009 at http://forums.arm.com

Sounds like you're driving strobe incorrectly; either too fast, the wrong way around (it is active low), or electrically incorrect (either insufficient voltage, or signal grounds not connected). Note also that the control signals are open collector.

hth
s.
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Simon Craske over 12 years ago

Note: This was originally posted on 26th June 2009 at http://forums.arm.com

Sounds like you're driving strobe incorrectly; either too fast, the wrong way around (it is active low), or electrically incorrect (either insufficient voltage, or signal grounds not connected). Note also that the control signals are open collector.

hth
s.
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