c0ec94e4c9
Needs major refactoring to split out the _actual_ arch dependent pieces. Needs parity and more complete baud rate support. Needs rs485 support.
21 lines
1,002 B
Text
21 lines
1,002 B
Text
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README
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This implements a USB CDC-ACM device, connected to USART2 (PA2-tx/PA3-rx)
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An interrupt driven tx ring buffer is used for usb->serial, and a similar
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interrupt driven rx ring buffer is used for serial->usb.
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Baud rates from 2400-460800 are tested with zmodem transfers in both directions.
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Parity not yet finished, and baudrates below 1200 need fiddling with clock prescalers.
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When it's finished, rs485 support should be available via the TC interrupt.
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A GPIO is toggled around USART transmissions to control an RS485 line
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transceiver, following ST's app note. The RS485 driver enable line is,
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by default, just the onboard red LEDs.
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The orange/blue LEDs indicate tx/rx activity, but especially for the rx line,
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you won't really see it without heavy data rates.
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This example is heavily based on the existing usb_cdcacm and usart demos.
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