Commit Graph

12 Commits

Author SHA1 Message Date
Peter Hinch d242a9b7f7 rp2/machine_uart: Use read/write mutex to prevent char duplication.
Duplication of characters is caused by re-entrant calls from separate cores
of uart_fill_tx_fifo().  This patch uses a mutex to ensure that a
re-entrant execution of the function returns without affecting the UART
FIFO.

Fixes issues #8344 and #8360.
2022-04-12 11:39:00 +10:00
YoungJoon Chun d8a7bf83cc rp2/machine_uart: Fix UART RTS behaviour so RTS is deasserted.
The UART hardware flow control was not working correctly, the receive FIFO
was always fetched and RTS was never deasserted.  This is not a problem
when hardware flow control is not used: normally, if the receive FIFO is
full, the UART receiver won't receive data into the FIFO anymore, but the
current implementation fetches from the FIFO and discards it instead.
The problem is that data is discarded even when RTS is enabled.

This commit fixes the issue by only taking from the FIFO if there is room
in the ring buffer to put the character.

Signed-off-by: YoungJoon Chun <yjchun@mac.com>
2022-02-09 16:29:53 +11:00
iabdalkader bef26d4e3f rp2/machine_uart: Add machine.UART init/deinit methods.
Without these methods a lot of existing "portable" scripts are broken.
This change improves portability by making rp2 machine.UART more compliant
with the documented machine UART interface.
2022-01-21 15:08:47 +11:00
iabdalkader f21c565583 rp2/machine_uart: Handle and clear UART RX timeout IRQ.
The pico-sdk 1.3.0 update in 97a7cc243b
introduced a change that broke RP2 Bluetooth UART, and possibly UART in
general, which stops working right after UART is initialized.  The commit
raspberrypi/pico-sdk@2622e9b enables the UART receive timeout (RTIM) IRQ,
which is asserted when the receive FIFO is not empty, and no more
characters are received for a period of time.

This commit makes sure the RTIM IRQ is handled and cleared in
uart_service_interrupt.
2021-12-14 14:59:39 +11:00
robert-hh ee49ae8f82 rp2/machine_uart: Fix read when FIFO has chars but ringbuf doesn't.
Prior to this fix, if the UART hardware FIFO had a few chars but still
below the FIFO trigger threshold, and the ringbuf was empty, the read
function would timeout if timeout==0 (the default timeout).

This fix follows the suggestion of @iabdalkader.
2021-07-25 17:48:50 +10:00
iabdalkader 2e62e13455 rp2/machine_uart: Fix poll ioctl to also check hardware FIFO.
The RX IRQ does not trigger if the FIFO is less than the trigger level, in
which case characters may be available in the FIFO, yet not in the ringbuf,
and the ioctl returns false.
2021-07-25 17:11:03 +10:00
iabdalkader 4f2a10bfc9 rp2/machine_uart: Allow overriding default machine UART pins. 2021-07-19 23:14:02 +10:00
iabdalkader 8599f7a68d rp2/machine_uart: Add hardware flow control support. 2021-07-19 23:13:57 +10:00
robert-hh 1be74b94b6 rp2/machine_uart: Add buffered transfer of data with rxbuf/txbuf kwargs.
Instantiation and init now support the rxbuf and txbuf keywords for setting
the buffer size.  The default size is 256 bytes.  The minimum and maximum
sizes are 32 and 32766 respectively.

uart.write() still includes checks for timeout, even if it is very unlikely
to happen due to a) lack of flow control support and b) the minimal timeout
values being longer than the time it needs to send a byte.
2021-04-12 21:31:08 +10:00
robert-hh da85cb014a rp2/machine_uart: Add support for inverted TX and RX lines.
Usage as in the other ports:

    keyword "invert"
    constants: INV_TX and INV_RX

Sample: uart = UART(1, invert=UART.INV_TX | UART.INV_RX)
2021-03-11 18:27:53 +11:00
robert-hh 8ade163fff rp2/machine_uart: Add timeout/timeout_char to read and write. 2021-03-11 18:19:15 +11:00
Damien George 469345e728 rp2: Add new port to Raspberry Pi RP2 microcontroller.
This commit adds a new port "rp2" which targets the new Raspberry Pi RP2040
microcontroller.

The build system uses pure cmake (with a small Makefile wrapper for
convenience).  The USB driver is TinyUSB, and there is a machine module
with most of the standard classes implemented.  Some examples are provided
in the examples/rp2/ directory.

Work done in collaboration with Graham Sanderson.

Signed-off-by: Damien George <damien@micropython.org>
2021-01-30 00:42:29 +11:00