[1.1.x] SERIAL_XON_XOFF not supported on USB-native AVR devices (#8653)
* SERIAL_XON_XOFF not supported on USB-native AVR devices User could enable SERIAL_XON_XOFF on USB-native devices and it would not be enabled without warning, but M115 would report the capability as available.
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@ -75,27 +75,26 @@
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#define BIN 2
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#define BYTE 0
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#ifndef USBCON
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// Define constants and variables for buffering incoming serial data. We're
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// using a ring buffer (I think), in which rx_buffer_head is the index of the
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// location to which to write the next incoming character and rx_buffer_tail
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// is the index of the location from which to read.
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// Use only powers of 2.
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// : [0, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, ...]
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#ifndef RX_BUFFER_SIZE
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// Define constants and variables for buffering serial data.
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// Use only 0 or powers of 2 greater than 1
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// : [0, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, ...]
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#ifndef RX_BUFFER_SIZE
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#define RX_BUFFER_SIZE 128
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#endif
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// 256 is the max TX buffer climit due to uint8_t head and tail.
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#ifndef TX_BUFFER_SIZE
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#endif
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// 256 is the max TX buffer limit due to uint8_t head and tail.
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#ifndef TX_BUFFER_SIZE
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#define TX_BUFFER_SIZE 32
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#endif
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#ifndef USBCON
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#if ENABLED(SERIAL_XON_XOFF) && RX_BUFFER_SIZE < 1024
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#error "SERIAL_XON_XOFF requires RX_BUFFER_SIZE >= 1024 for reliable transfers without drops."
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#endif
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#if ENABLED(SERIAL_XON_XOFF) && RX_BUFFER_SIZE < 1024
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#error "XON/XOFF requires RX_BUFFER_SIZE >= 1024 for reliable transfers without drops."
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#endif
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#if !IS_POWER_OF_2(RX_BUFFER_SIZE) || RX_BUFFER_SIZE < 2
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#error "RX_BUFFER_SIZE must be a power of 2 greater than 1."
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#endif
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#if TX_BUFFER_SIZE && (TX_BUFFER_SIZE < 2 || TX_BUFFER_SIZE > 256 || !IS_POWER_OF_2(TX_BUFFER_SIZE))
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#error "TX_BUFFER_SIZE must be 0, a power of 2 greater than 1, and no greater than 256."
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#endif
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@ -245,6 +245,13 @@
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#error "WEBSITE_URL must be specified."
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#endif
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/**
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* Serial
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*/
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#if defined(USBCON) && ENABLED(SERIAL_XON_XOFF)
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#error "SERIAL_XON_XOFF is not supported on USB-native AVR devices."
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#endif
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/**
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* Dual Stepper Drivers
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*/
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