Merge pull request #39 from adafruit/main

Merge from adafruit main for RP2040

3 files changed, 565 insertions, 0 deletions

diff --git a/ports/raspberrypi/bindings/rp2pio/StateMachine.c b/ports/raspberrypi/bindings/rp2pio/StateMachine.c
new file mode 100644
index 000000000..0f6f84a56
--- /dev/null
+++ b/ports/raspberrypi/bindings/rp2pio/StateMachine.c
@@ -0,0 +1,449 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// This file contains all of the Python API definitions for the
+// rp2pio.StateMachine class.
+
+#include <string.h>
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "bindings/rp2pio/StateMachine.h"
+#include "shared-bindings/util.h"
+
+#include "lib/utils/buffer_helper.h"
+#include "lib/utils/context_manager_helpers.h"
+#include "lib/utils/interrupt_char.h"
+#include "py/mperrno.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "supervisor/shared/translate.h"
+
+
+//| class StateMachine:
+//|     """A single PIO StateMachine
+//|
+//|     The programmable I/O peripheral on the RP2 series of microcontrollers is
+//|     unique. It is a collection of generic state machines that can be
+//|     used for a variety of protocols. State machines may be independent or
+//|     coordinated. Program memory and IRQs are shared between the state machines
+//|     in a particular PIO instance. They are independent otherwise.
+//|
+//|     This class is designed to facilitate sharing of PIO resources. By default,
+//|     it is assumed that the state machine is used on its own and can be placed
+//|     in either PIO. State machines with the same program will be placed in the
+//|     same PIO if possible. To ensure multiple state machines share a PIO use
+//|     the ``colocate`` kwarg during construction and create them one after another."""
+//|
+//|     def __init__(self,
+//|                  program: ReadableBuffer,
+//|                  frequency: int,
+//|                  *,
+//|                  init: Optional[ReadableBuffer] = None,
+//|                  first_out_pin: Optional[microcontroller.Pin] = None,
+//|                  out_pin_count: int = 1,
+//|                  first_in_pin: Optional[microcontroller.Pin] = None,
+//|                  in_pin_count: int = 1,
+//|                  first_set_pin: Optional[microcontroller.Pin] = None,
+//|                  set_pin_count: int = 1,
+//|                  first_sideset_pin: Optional[microcontroller.Pin] = None,
+//|                  sideset_pin_count: int = 1,
+//|                  exclusive_pin_use: bool = True,
+//|                  auto_pull: bool = False,
+//|                  pull_threshold : int = 32,
+//|                  out_shift_right : bool = True,
+//|                  auto_push: bool = False,
+//|                  push_threshold : int = 32,
+//|                  in_shift_right : bool = True) -> None:
+// //|                  colocate: Union[int, StateMachine, None] = None
+//|
+//|         """Construct a StateMachine object on the given pins with the given program.
+//|
+//|         :param ReadableBuffer program: the program to run with the state machine
+//|         :param int frequency: the target clock frequency of the state machine. Actual may be less.
+//|         :param ReadableBuffer init: a program to run once at start up. This is run after program
+//|              is started so instructions may be intermingled
+//|         :param ~microcontroller.Pin first_out_pin: the first pin to use with the OUT instruction
+//|         :param int out_pin_count: the count of consecutive pins to use with OUT starting at first_out_pin
+//|         :param ~microcontroller.Pin first_in_pin: the first pin to use with the IN instruction
+//|         :param int in_pin_count: the count of consecutive pins to use with IN starting at first_in_pin
+//|         :param ~microcontroller.Pin first_set_pin: the first pin to use with the SET instruction
+//|         :param int set_pin_count: the count of consecutive pins to use with SET starting at first_set_pin
+//|         :param ~microcontroller.Pin first_sideset_pin: the first pin to use with a side set
+//|         :param int sideset_pin_count: the count of consecutive pins to use with a side set starting at first_sideset_pin
+//|         :param bool exclusive_pin_use: When True, do not share any pins with other state machines. Pins are never shared with other peripherals
+//|         :param bool auto_pull: When True, automatically load data from the tx FIFO into the
+//|             output shift register (OSR) when an OUT instruction shifts more than pull_threshold bits
+//|         :param int pull_threshold: Number of bits to shift before loading a new value into the OSR from the tx FIFO
+//|         :param bool out_shift_right: When True, data is shifted out the right side (LSB) of the
+//|             OSR. It is shifted out the left (MSB) otherwise. NOTE! This impacts data alignment
+//|             when the number of bytes is not a power of two (1, 2 or 4 bytes).
+//|         :param bool auto_push: When True, automatically save data from input shift register
+//|              (ISR) into the rx FIFO when an IN instruction shifts more than push_threshold bits
+//|         :param int push_threshold: Number of bits to shift before saving the ISR value to the RX FIFO
+//|         :param bool in_shift_right: When True, data is shifted into the right side (LSB) of the
+//|             ISR. It is shifted into the left (MSB) otherwise. NOTE! This impacts data alignment
+//|             when the number of bytes is not a power of two (1, 2 or 4 bytes)."""
+//|         ...
+//|
+
+STATIC mp_obj_t rp2pio_statemachine_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    rp2pio_statemachine_obj_t *self = m_new_obj(rp2pio_statemachine_obj_t);
+    self->base.type = &rp2pio_statemachine_type;
+    enum { ARG_program, ARG_frequency, ARG_init,
+           ARG_first_out_pin, ARG_out_pin_count,
+           ARG_first_in_pin, ARG_in_pin_count,
+           ARG_first_set_pin, ARG_set_pin_count,
+           ARG_first_sideset_pin, ARG_sideset_pin_count,
+           ARG_exclusive_pin_use,
+           ARG_auto_pull, ARG_pull_threshold, ARG_out_shift_right,
+           ARG_auto_push, ARG_push_threshold, ARG_in_shift_right};
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_program, MP_ARG_REQUIRED | MP_ARG_OBJ },
+        { MP_QSTR_frequency, MP_ARG_REQUIRED | MP_ARG_INT },
+        { MP_QSTR_init, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_first_out_pin, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_out_pin_count, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
+        { MP_QSTR_first_in_pin, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_in_pin_count, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
+        { MP_QSTR_first_set_pin, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_set_pin_count, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
+        { MP_QSTR_first_sideset_pin, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_sideset_pin_count, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
+        { MP_QSTR_exclusive_pin_use, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
+        { MP_QSTR_auto_pull, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
+        { MP_QSTR_pull_threshold, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 32} },
+        { MP_QSTR_out_shift_right, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
+        { MP_QSTR_auto_push, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
+        { MP_QSTR_push_threshold, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 32} },
+        { MP_QSTR_in_shift_right, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(args[ARG_program].u_obj, &bufinfo, MP_BUFFER_READ);
+
+    mp_buffer_info_t init_bufinfo;
+    init_bufinfo.len = 0;
+    mp_get_buffer(args[ARG_init].u_obj, &init_bufinfo, MP_BUFFER_READ);
+
+    // We don't validate pin in use here because we may be ok sharing them within a PIO.
+    mcu_pin_obj_t *first_out_pin = validate_obj_is_pin_or_none(args[ARG_first_out_pin].u_obj);
+    if (args[ARG_out_pin_count].u_int < 1) {
+        mp_raise_ValueError(translate("Pin count must be at least 1"));
+    }
+    mcu_pin_obj_t *first_in_pin = validate_obj_is_pin_or_none(args[ARG_first_in_pin].u_obj);
+    if (args[ARG_in_pin_count].u_int < 1) {
+        mp_raise_ValueError(translate("Pin count must be at least 1"));
+    }
+    mcu_pin_obj_t *first_set_pin = validate_obj_is_pin_or_none(args[ARG_first_set_pin].u_obj);
+    if (args[ARG_set_pin_count].u_int < 1) {
+        mp_raise_ValueError(translate("Pin count must be at least 1"));
+    }
+    if (args[ARG_set_pin_count].u_int > 5) {
+        mp_raise_ValueError(translate("Set pin count must be between 1 and 5"));
+    }
+    mcu_pin_obj_t *first_sideset_pin = validate_obj_is_pin_or_none(args[ARG_first_sideset_pin].u_obj);
+    if (args[ARG_sideset_pin_count].u_int < 1) {
+        mp_raise_ValueError(translate("Pin count must be at least 1"));
+    }
+    if (args[ARG_sideset_pin_count].u_int > 5) {
+        mp_raise_ValueError(translate("Side set pin count must be between 1 and 5"));
+    }
+
+    mp_int_t pull_threshold = args[ARG_pull_threshold].u_int;
+    mp_int_t push_threshold = args[ARG_push_threshold].u_int;
+    if (pull_threshold < 1 || pull_threshold > 32) {
+        mp_raise_ValueError(translate("pull_threshold must be between 1 and 32"));
+    }
+    if (push_threshold < 1 || push_threshold > 32) {
+        mp_raise_ValueError(translate("push_threshold must be between 1 and 32"));
+    }
+
+    if (bufinfo.len < 2) {
+        mp_raise_ValueError(translate("Program must contain at least one 16-bit instruction."));
+    }
+    if (bufinfo.len % 2 != 0) {
+        mp_raise_ValueError(translate("Program size invalid"));
+    }
+    if (bufinfo.len > 32) {
+        mp_raise_ValueError(translate("Program too large"));
+    }
+
+    if (init_bufinfo.len % 2 != 0) {
+        mp_raise_ValueError(translate("Init program size invalid"));
+    }
+
+    common_hal_rp2pio_statemachine_construct(self,
+        bufinfo.buf, bufinfo.len / 2,
+        args[ARG_frequency].u_int,
+        init_bufinfo.buf, init_bufinfo.len / 2,
+        first_out_pin, args[ARG_out_pin_count].u_int,
+        first_in_pin, args[ARG_in_pin_count].u_int,
+        first_set_pin, args[ARG_set_pin_count].u_int,
+        first_sideset_pin, args[ARG_sideset_pin_count].u_int,
+        args[ARG_exclusive_pin_use].u_bool,
+        args[ARG_auto_pull].u_bool, pull_threshold, args[ARG_out_shift_right].u_bool,
+        args[ARG_auto_push].u_bool, push_threshold, args[ARG_in_shift_right].u_bool);
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|     def deinit(self) -> None:
+//|         """Turn off the state machine and release its resources."""
+//|         ...
+//|
+STATIC mp_obj_t rp2pio_statemachine_obj_deinit(mp_obj_t self_in) {
+    rp2pio_statemachine_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_rp2pio_statemachine_deinit(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(rp2pio_statemachine_deinit_obj, rp2pio_statemachine_obj_deinit);
+
+//|     def __enter__(self) -> StateMachine:
+//|         """No-op used by Context Managers.
+//|         Provided by context manager helper."""
+//|         ...
+//|
+
+//|     def __exit__(self) -> None:
+//|         """Automatically deinitializes the hardware when exiting a context. See
+//|         :ref:`lifetime-and-contextmanagers` for more info."""
+//|         ...
+//|
+STATIC mp_obj_t rp2pio_statemachine_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_rp2pio_statemachine_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(rp2pio_statemachine_obj___exit___obj, 4, 4, rp2pio_statemachine_obj___exit__);
+
+
+STATIC void check_for_deinit(rp2pio_statemachine_obj_t *self) {
+    if (common_hal_rp2pio_statemachine_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+// // |     def restart(self, *other_state_machines) -> None:
+// // |         """Restarts this state machine and any others given. They must share
+// // |            an underlying PIO. An exception will be raised otherwise."""
+// // |         ...
+// // |
+
+//|     def write(self, buffer: ReadableBuffer, *, start: int = 0, end: Optional[int] = None) -> None:
+//|         """Write the data contained in ``buffer`` to the state machine. If the buffer is empty, nothing happens.
+//|
+//|         :param ~_typing.ReadableBuffer buffer: Write out the data in this buffer
+//|         :param int start: Start of the slice of ``buffer`` to write out: ``buffer[start:end]``
+//|         :param int end: End of the slice; this index is not included. Defaults to ``len(buffer)``"""
+//|         ...
+//|
+
+STATIC mp_obj_t rp2pio_statemachine_write(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_buffer, ARG_start, ARG_end };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_buffer,     MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_start,      MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_end,        MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
+    };
+    rp2pio_statemachine_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    check_for_deinit(self);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ);
+    int32_t start = args[ARG_start].u_int;
+    size_t length = bufinfo.len;
+    normalize_buffer_bounds(&start, args[ARG_end].u_int, &length);
+
+    if (length == 0) {
+        return mp_const_none;
+    }
+
+    bool ok = common_hal_rp2pio_statemachine_write(self, ((uint8_t*)bufinfo.buf) + start, length);
+    if (mp_hal_is_interrupted()) {
+        return mp_const_none;
+    }
+    if (!ok) {
+        mp_raise_OSError(MP_EIO);
+    }
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(rp2pio_statemachine_write_obj, 2, rp2pio_statemachine_write);
+
+
+// // |     def readinto(self, buffer: WriteableBuffer, *, start: int = 0, end: Optional[int] = None) -> None:
+// // |         """Read into ``buffer``. If the number of bytes to read is 0, nothing happens.
+// // |
+// // |         :param ~_typing.WriteableBuffer buffer: Read data into this buffer
+// // |         :param int start: Start of the slice of ``buffer`` to read into: ``buffer[start:end]``
+// // |         :param int end: End of the slice; this index is not included. Defaults to ``len(buffer)``
+// // |         :param int write_value: Value to write while reading. (Usually ignored.)"""
+// // |         ...
+// // |
+
+// STATIC mp_obj_t rp2pio_statemachine_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+//     enum { ARG_buffer, ARG_start, ARG_end, ARG_write_value };
+//     static const mp_arg_t allowed_args[] = {
+//         { MP_QSTR_buffer,     MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+//         { MP_QSTR_start,      MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+//         { MP_QSTR_end,        MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
+//         { MP_QSTR_write_value,MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+//     };
+//     rp2pio_statemachine_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+//     check_for_deinit(self);
+//     check_lock(self);
+//     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+//     mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+//     mp_buffer_info_t bufinfo;
+//     mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_WRITE);
+//     int32_t start = args[ARG_start].u_int;
+//     size_t length = bufinfo.len;
+//     normalize_buffer_bounds(&start, args[ARG_end].u_int, &length);
+
+//     if (length == 0) {
+//         return mp_const_none;
+//     }
+
+//     bool ok = common_hal_rp2pio_statemachine_read(self, ((uint8_t*)bufinfo.buf) + start, length, args[ARG_write_value].u_int);
+//     if (!ok) {
+//         mp_raise_OSError(MP_EIO);
+//     }
+//     return mp_const_none;
+// }
+// MP_DEFINE_CONST_FUN_OBJ_KW(rp2pio_statemachine_readinto_obj, 2, rp2pio_statemachine_readinto);
+
+// //|     def write_readinto(self, buffer_out: ReadableBuffer, buffer_in: WriteableBuffer, *, out_start: int = 0, out_end: Optional[int] = None, in_start: int = 0, in_end: Optional[int] = None) -> None:
+// //|         """Write out the data in ``buffer_out`` while simultaneously reading data into ``buffer_in``.
+// //|         The SPI object must be locked.
+// //|         The lengths of the slices defined by ``buffer_out[out_start:out_end]`` and ``buffer_in[in_start:in_end]``
+// //|         must be equal.
+// //|         If buffer slice lengths are both 0, nothing happens.
+// //|
+// //|         :param ~_typing.ReadableBuffer buffer_out: Write out the data in this buffer
+// //|         :param ~_typing.WriteableBuffer buffer_in: Read data into this buffer
+// //|         :param int out_start: Start of the slice of buffer_out to write out: ``buffer_out[out_start:out_end]``
+// //|         :param int out_end: End of the slice; this index is not included. Defaults to ``len(buffer_out)``
+// //|         :param int in_start: Start of the slice of ``buffer_in`` to read into: ``buffer_in[in_start:in_end]``
+// //|         :param int in_end: End of the slice; this index is not included. Defaults to ``len(buffer_in)``"""
+// //|         ...
+// //|
+
+// STATIC mp_obj_t rp2pio_statemachine_write_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+//     enum { ARG_buffer_out, ARG_buffer_in, ARG_out_start, ARG_out_end, ARG_in_start, ARG_in_end };
+//     static const mp_arg_t allowed_args[] = {
+//         { MP_QSTR_buffer_out,    MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+//         { MP_QSTR_buffer_in,     MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+//         { MP_QSTR_out_start,     MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+//         { MP_QSTR_out_end,       MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
+//         { MP_QSTR_in_start,      MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+//         { MP_QSTR_in_end,        MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
+//     };
+//     rp2pio_statemachine_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+//     check_for_deinit(self);
+//     check_lock(self);
+//     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+//     mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+//     mp_buffer_info_t buf_out_info;
+//     mp_get_buffer_raise(args[ARG_buffer_out].u_obj, &buf_out_info, MP_BUFFER_READ);
+//     int32_t out_start = args[ARG_out_start].u_int;
+//     size_t out_length = buf_out_info.len;
+//     normalize_buffer_bounds(&out_start, args[ARG_out_end].u_int, &out_length);
+
+//     mp_buffer_info_t buf_in_info;
+//     mp_get_buffer_raise(args[ARG_buffer_in].u_obj, &buf_in_info, MP_BUFFER_WRITE);
+//     int32_t in_start = args[ARG_in_start].u_int;
+//     size_t in_length = buf_in_info.len;
+//     normalize_buffer_bounds(&in_start, args[ARG_in_end].u_int, &in_length);
+
+//     if (out_length != in_length) {
+//         mp_raise_ValueError(translate("buffer slices must be of equal length"));
+//     }
+
+//     if (out_length == 0) {
+//         return mp_const_none;
+//     }
+
+//     bool ok = common_hal_rp2pio_statemachine_transfer(self,
+//                                             ((uint8_t*)buf_out_info.buf) + out_start,
+//                                             ((uint8_t*)buf_in_info.buf) + in_start,
+//                                             out_length);
+//     if (!ok) {
+//         mp_raise_OSError(MP_EIO);
+//     }
+//     return mp_const_none;
+// }
+// MP_DEFINE_CONST_FUN_OBJ_KW(rp2pio_statemachine_write_readinto_obj, 2, rp2pio_statemachine_write_readinto);
+
+//|     frequency: int
+//|     """The actual state machine frequency. This may not match the frequency requested
+//|     due to internal limitations."""
+//|
+
+STATIC mp_obj_t rp2pio_statemachine_obj_get_frequency(mp_obj_t self_in) {
+    rp2pio_statemachine_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_rp2pio_statemachine_get_frequency(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(rp2pio_statemachine_get_frequency_obj, rp2pio_statemachine_obj_get_frequency);
+
+const mp_obj_property_t rp2pio_statemachine_frequency_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&rp2pio_statemachine_get_frequency_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+STATIC const mp_rom_map_elem_t rp2pio_statemachine_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&rp2pio_statemachine_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&rp2pio_statemachine_obj___exit___obj) },
+
+//    { MP_ROM_QSTR(MP_QSTR_restart), MP_ROM_PTR(&rp2pio_statemachine_configure_obj) },
+
+//    { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&rp2pio_statemachine_readinto_obj) },
+    { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&rp2pio_statemachine_write_obj) },
+//     { MP_ROM_QSTR(MP_QSTR_write_readinto), MP_ROM_PTR(&rp2pio_statemachine_write_readinto_obj) },
+    { MP_ROM_QSTR(MP_QSTR_frequency), MP_ROM_PTR(&rp2pio_statemachine_frequency_obj) }
+};
+STATIC MP_DEFINE_CONST_DICT(rp2pio_statemachine_locals_dict, rp2pio_statemachine_locals_dict_table);
+
+const mp_obj_type_t rp2pio_statemachine_type = {
+   { &mp_type_type },
+   .name = MP_QSTR_StateMachine,
+   .make_new = rp2pio_statemachine_make_new,
+   .locals_dict = (mp_obj_dict_t*)&rp2pio_statemachine_locals_dict,
+};
+
+rp2pio_statemachine_obj_t *validate_obj_is_statemachine(mp_obj_t obj) {
+    if (!MP_OBJ_IS_TYPE(obj, &rp2pio_statemachine_type)) {
+        mp_raise_TypeError_varg(translate("Expected a %q"), rp2pio_statemachine_type.name);
+    }
+    return MP_OBJ_TO_PTR(obj);
+}
diff --git a/ports/raspberrypi/bindings/rp2pio/StateMachine.h b/ports/raspberrypi/bindings/rp2pio/StateMachine.h
new file mode 100644
index 000000000..5ff20a75b
--- /dev/null
+++ b/ports/raspberrypi/bindings/rp2pio/StateMachine.h
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_RASPBERRYPI_BINDINGS_RP2PIO_STATEMACHINE_H
+#define MICROPY_INCLUDED_RASPBERRYPI_BINDINGS_RP2PIO_STATEMACHINE_H
+
+#include "py/obj.h"
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/rp2pio/StateMachine.h"
+
+// Type object used in Python. Should be shared between ports.
+extern const mp_obj_type_t rp2pio_statemachine_type;
+
+// Construct an underlying SPI object.
+extern void common_hal_rp2pio_statemachine_construct(rp2pio_statemachine_obj_t *self,
+    const uint16_t* program, size_t program_len,
+    size_t frequency,
+    const uint16_t* init, size_t init_len,
+    const mcu_pin_obj_t * first_out_pin, uint8_t out_pin_count,
+    const mcu_pin_obj_t * first_in_pin, uint8_t in_pin_count,
+    const mcu_pin_obj_t * first_set_pin, uint8_t set_pin_count,
+    const mcu_pin_obj_t * first_sideset_pin, uint8_t sideset_pin_count,
+    bool exclusive_pin_use,
+    bool auto_pull, uint8_t pull_threshold, bool out_shift_right,
+    bool auto_push, uint8_t push_threshold, bool in_shift_right);
+
+extern void common_hal_rp2pio_statemachine_deinit(rp2pio_statemachine_obj_t *self);
+extern bool common_hal_rp2pio_statemachine_deinited(rp2pio_statemachine_obj_t *self);
+
+// Writes out the given data.
+extern bool common_hal_rp2pio_statemachine_write(rp2pio_statemachine_obj_t *self, const uint8_t *data, size_t len);
+
+// // Reads in len bytes while outputting zeroes.
+// extern bool common_hal_rp2pio_statemachine_read(rp2pio_statemachine_obj_t *self, uint8_t *data, size_t len, uint8_t write_value);
+
+// // Reads and write len bytes simultaneously.
+// extern bool common_hal_rp2pio_statemachine_transfer(rp2pio_statemachine_obj_t *self,
+//                                           const uint8_t *data_out, size_t out_len,
+//                                           uint8_t *data_in, size_t in_len);
+
+// Return actual SPI bus frequency.
+uint32_t common_hal_rp2pio_statemachine_get_frequency(rp2pio_statemachine_obj_t* self);
+
+// This is used by the supervisor to claim SPI devices indefinitely.
+// extern void common_hal_rp2pio_statemachine_never_reset(rp2pio_statemachine_obj_t *self);
+
+#endif // MICROPY_INCLUDED_RASPBERRYPI_BINDINGS_RP2PIO_STATEMACHINE_H
diff --git a/ports/raspberrypi/bindings/rp2pio/__init__.c b/ports/raspberrypi/bindings/rp2pio/__init__.c
new file mode 100644
index 000000000..dd5808cd5
--- /dev/null
+++ b/ports/raspberrypi/bindings/rp2pio/__init__.c
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "bindings/rp2pio/StateMachine.h"
+
+//| """Hardware interface to RP2 series' programmable IO (PIO) peripheral."""
+//|
+
+STATIC const mp_rom_map_elem_t rp2pio_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_rp2pio) },
+    { MP_ROM_QSTR(MP_QSTR_StateMachine),  MP_ROM_PTR(&rp2pio_statemachine_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(rp2pio_module_globals, rp2pio_module_globals_table);
+
+const mp_obj_module_t rp2pio_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&rp2pio_module_globals,
+};