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This provides improved support on rp2350 chips.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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A new version of can2040 is needed due to changes in the 2.0.0 release
of the pico-sdk.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Add support for can2040_stop()
Add data_state_go_error() helper
Add new can2040_get_statistics() API function
Call report_note_discarding() after setting MS_DISCARD state
Convert report_is_rx_eof_pending() to report_is_not_in_tx()
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Disable tx state machine before resetting it
Check for rx message with same id as tx but different payload
Do not use canrx line to alter bit timing of cantx line
Improve bit time synchronization with slow transmitters
Implement tx synchronization to faster transmitters
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Fix tx hang after error frame during tx
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Avoid some gcc warnings by using uint32_t for iterators
Better document the fallthough case statement in crc_bytes()
Fix txpending race from report_line_ackdone()
Make can2040_transmit() multi-cpu atomic
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Clear PIO irq flags in pio_sm_setup()
Set TXPENDING during pio_sm_setup()
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Fix PIO "sync" register overflow check
Reduce latency of tx scheduling
Clear ackdone irq from report_note_eof_success()
Defer ack inject until after rx fifo drained
Improve passive/dominant bit conflict check on tx reschedule
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Minor comment change to unstuf_pull_bits()
Introduce unstuf_get_raw() helper function
Move crc stuffed bit calculation to data_state_go_crc()
Restore stuffed_bits state on missing ack
Use a single pio_irq_set() function
Reschedule tx if previous tx unexpectedly finished transmit
Simplify report_state handling
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Fix gpio function selection for PIO1 usage.
Minor variable name changes.
Allow scheduling tx "matched" event after a crc match.
Allow for up to 5 passive bits after unstuf_clear_state().
Pause PIO "rx" bit reception after 10 passive bits.
Signal the CPU to process data every 10 read bits.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Simplify tx state tracking.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Rename to "match" state machine instead of "ack".
Minor simplification to tx_note_crc_start().
Call pio_match_clear() from report functions.
Add pio_match_calc_key() helper function.
Raise irq after 6 passive eof bits for faster rx message notification.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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The "can2040" project implements "software canbus" support on rp2040
micro-controllers.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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