add circuitpython code

1 files changed, 383 insertions, 0 deletions

diff --git a/circuitpython/shared-bindings/bitbangio/SPI.c b/circuitpython/shared-bindings/bitbangio/SPI.c
new file mode 100644
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--- /dev/null
+++ b/circuitpython/shared-bindings/bitbangio/SPI.c
@@ -0,0 +1,383 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ *
+ * 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
+// bitbangio.SPI class.
+
+#include <string.h>
+
+#include "shared-bindings/bitbangio/SPI.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/util.h"
+
+#include "shared/runtime/buffer_helper.h"
+#include "shared/runtime/context_manager_helpers.h"
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "supervisor/shared/translate.h"
+
+//| class SPI:
+//|     """A 3-4 wire serial protocol
+//|
+//|     SPI is a serial protocol that has exclusive pins for data in and out of the
+//|     main device.  It is typically faster than :py:class:`~bitbangio.I2C` because a
+//|     separate pin is used to select a device rather than a transmitted
+//|     address. This class only manages three of the four SPI lines: `!clock`,
+//|     `!MOSI`, `!MISO`. Its up to the client to manage the appropriate
+//|     select line, often abbreviated `!CS` or `!SS`. (This is common because
+//|     multiple secondaries can share the `!clock`, `!MOSI` and `!MISO` lines
+//|     and therefore the hardware.)"""
+//|
+//|     def __init__(self, clock: microcontroller.Pin, MOSI: Optional[microcontroller.Pin] = None, MISO: Optional[microcontroller.Pin] = None) -> None:
+//|         """Construct an SPI object on the given pins.
+//|
+//|         .. seealso:: Using this class directly requires careful lock management.
+//|             Instead, use :class:`~adafruit_bus_device.spi_device.SPIDevice` to
+//|             manage locks.
+//|
+//|         .. seealso:: Using this class to directly read registers requires manual
+//|             bit unpacking. Instead, use an existing driver or make one with
+//|             :ref:`Register <register-module-reference>` data descriptors.
+//|
+//|
+//|         :param ~microcontroller.Pin clock: the pin to use for the clock.
+//|         :param ~microcontroller.Pin MOSI: the Main Out Selected In pin.
+//|         :param ~microcontroller.Pin MISO: the Main In Selected Out pin."""
+//|         ...
+//|
+
+// TODO(tannewt): Support LSB SPI.
+STATIC mp_obj_t bitbangio_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
+    enum { ARG_clock, ARG_MOSI, ARG_MISO, ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits, ARG_firstbit };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_clock, MP_ARG_REQUIRED | MP_ARG_OBJ },
+        { MP_QSTR_MOSI, MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_MISO, MP_ARG_OBJ, {.u_obj = mp_const_none} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    const mcu_pin_obj_t *clock = validate_obj_is_free_pin(args[ARG_clock].u_obj);
+    const mcu_pin_obj_t *mosi = validate_obj_is_free_pin_or_none(args[ARG_MOSI].u_obj);
+    const mcu_pin_obj_t *miso = validate_obj_is_free_pin_or_none(args[ARG_MISO].u_obj);
+
+    bitbangio_spi_obj_t *self = m_new_obj(bitbangio_spi_obj_t);
+    self->base.type = &bitbangio_spi_type;
+    shared_module_bitbangio_spi_construct(self, clock, mosi, miso);
+    return (mp_obj_t)self;
+}
+
+//|     def deinit(self) -> None:
+//|         """Turn off the SPI bus."""
+//|         ...
+//|
+STATIC mp_obj_t bitbangio_spi_obj_deinit(mp_obj_t self_in) {
+    bitbangio_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    shared_module_bitbangio_spi_deinit(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(bitbangio_spi_deinit_obj, bitbangio_spi_obj_deinit);
+
+STATIC void check_for_deinit(bitbangio_spi_obj_t *self) {
+    if (shared_module_bitbangio_spi_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+//|     def __enter__(self) -> SPI:
+//|         """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 bitbangio_spi_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    shared_module_bitbangio_spi_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(bitbangio_spi_obj___exit___obj, 4, 4, bitbangio_spi_obj___exit__);
+
+
+static void check_lock(bitbangio_spi_obj_t *self) {
+    if (!shared_module_bitbangio_spi_has_lock(self)) {
+        mp_raise_RuntimeError(translate("Function requires lock"));
+    }
+}
+
+//|     def configure(self, *, baudrate: int = 100000, polarity: int = 0, phase: int = 0, bits: int = 8) -> None:
+//|         """Configures the SPI bus. Only valid when locked.
+//|
+//|         :param int baudrate: the clock rate in Hertz
+//|         :param int polarity: the base state of the clock line (0 or 1)
+//|         :param int phase: the edge of the clock that data is captured. First (0)
+//|           or second (1). Rising or falling depends on clock polarity.
+//|         :param int bits: the number of bits per word"""
+//|         ...
+//|
+STATIC mp_obj_t bitbangio_spi_configure(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_baudrate, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 100000} },
+        { MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
+    };
+    bitbangio_spi_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);
+
+    uint8_t polarity = args[ARG_polarity].u_int;
+    if (polarity != 0 && polarity != 1) {
+        mp_raise_ValueError(translate("Invalid polarity"));
+    }
+    uint8_t phase = args[ARG_phase].u_int;
+    if (phase != 0 && phase != 1) {
+        mp_raise_ValueError(translate("Invalid phase"));
+    }
+    uint8_t bits = args[ARG_bits].u_int;
+    if (bits != 8 && bits != 9) {
+        mp_raise_ValueError(translate("Invalid number of bits"));
+    }
+
+    shared_module_bitbangio_spi_configure(self, args[ARG_baudrate].u_int, polarity, phase, bits);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(bitbangio_spi_configure_obj, 1, bitbangio_spi_configure);
+
+//|     def try_lock(self) -> bool:
+//|         """Attempts to grab the SPI lock. Returns True on success.
+//|
+//|         :return: True when lock has been grabbed
+//|         :rtype: bool"""
+//|         ...
+//|
+STATIC mp_obj_t bitbangio_spi_obj_try_lock(mp_obj_t self_in) {
+    bitbangio_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return mp_obj_new_bool(shared_module_bitbangio_spi_try_lock(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(bitbangio_spi_try_lock_obj, bitbangio_spi_obj_try_lock);
+
+//|     def unlock(self) -> None:
+//|         """Releases the SPI lock."""
+//|         ...
+//|
+STATIC mp_obj_t bitbangio_spi_obj_unlock(mp_obj_t self_in) {
+    bitbangio_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    shared_module_bitbangio_spi_unlock(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(bitbangio_spi_unlock_obj, bitbangio_spi_obj_unlock);
+
+//|     def write(self, buf: ReadableBuffer) -> None:
+//|         """Write the data contained in ``buf``. Requires the SPI being locked.
+//|         If the buffer is empty, nothing happens."""
+//|         ...
+//|
+STATIC mp_obj_t bitbangio_spi_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} },
+    };
+    bitbangio_spi_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_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 = shared_module_bitbangio_spi_write(self, ((uint8_t *)bufinfo.buf) + start, length);
+    if (!ok) {
+        mp_raise_OSError(MP_EIO);
+    }
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(bitbangio_spi_write_obj, 1, bitbangio_spi_write);
+
+
+//|     import sys
+//|     def readinto(self, buffer: WriteableBuffer, *, start: int = 0, end: int = sys.maxsize, write_value: int = 0) -> None:
+//|         """Read into ``buffer`` while writing ``write_value`` for each byte read.
+//|         The SPI object must be locked.
+//|         If the number of bytes to read is 0, nothing happens.
+//|
+//|         If ``start`` or ``end`` is provided, then the buffer will be sliced
+//|         as if ``buffer[start:end]`` were passed.
+//|         The number of bytes read will be the length of ``buffer[start:end]``.
+//|
+//|         :param WriteableBuffer buffer: read bytes into this buffer
+//|         :param int start: beginning of buffer slice
+//|         :param int end: end of buffer slice; if not specified, use ``len(buffer)``
+//|         :param int write_value: value to write while reading
+//|         """
+//|         ...
+//|
+STATIC mp_obj_t bitbangio_spi_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} },
+    };
+    bitbangio_spi_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 = shared_module_bitbangio_spi_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(bitbangio_spi_readinto_obj, 1, bitbangio_spi_readinto);
+
+//|     import sys
+//|     def write_readinto(self, out_buffer: ReadableBuffer, in_buffer: WriteableBuffer, *, out_start: int = 0, out_end: int = sys.maxsize, in_start: int = 0, in_end: int = sys.maxsize) -> None:
+//|         """Write out the data in ``out_buffer`` while simultaneously reading data into ``in_buffer``.
+//|         The SPI object must be locked.
+//|
+//|         If ``out_start`` or ``out_end`` is provided, then the buffer will be sliced
+//|         as if ``out_buffer[out_start:out_end]`` were passed, but without copying the data.
+//|         The number of bytes written will be the length of ``out_buffer[out_start:out_end]``.
+//|
+//|         If ``in_start`` or ``in_end`` is provided, then the input buffer will be sliced
+//|         as if ``in_buffer[in_start:in_end]`` were passed,
+//|         The number of bytes read will be the length of ``out_buffer[in_start:in_end]``.
+//|
+//|         The lengths of the slices defined by ``out_buffer[out_start:out_end]``
+//|         and ``in_buffer[in_start:in_end]`` must be equal.
+//|         If buffer slice lengths are both 0, nothing happens.
+//|
+//|         :param ReadableBuffer out_buffer: write out bytes from this buffer
+//|         :param WriteableBuffer in_buffer: read bytes into this buffer
+//|         :param int out_start: beginning of ``out_buffer`` slice
+//|         :param int out_end: end of ``out_buffer`` slice; if not specified, use ``len(out_buffer)``
+//|         :param int in_start: beginning of ``in_buffer`` slice
+//|         :param int in_end: end of ``in_buffer slice``; if not specified, use ``len(in_buffer)``
+//|         """
+//|         ...
+//|
+STATIC mp_obj_t bitbangio_spi_write_readinto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_out_buffer, ARG_in_buffer, ARG_out_start, ARG_out_end, ARG_in_start, ARG_in_end };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_out_buffer,    MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_in_buffer,     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} },
+    };
+    bitbangio_spi_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_out_buffer].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_in_buffer].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 = shared_module_bitbangio_spi_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(bitbangio_spi_write_readinto_obj, 1, bitbangio_spi_write_readinto);
+
+STATIC const mp_rom_map_elem_t bitbangio_spi_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&bitbangio_spi_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&bitbangio_spi_obj___exit___obj) },
+
+    { MP_ROM_QSTR(MP_QSTR_configure), MP_ROM_PTR(&bitbangio_spi_configure_obj) },
+    { MP_ROM_QSTR(MP_QSTR_try_lock), MP_ROM_PTR(&bitbangio_spi_try_lock_obj) },
+    { MP_ROM_QSTR(MP_QSTR_unlock), MP_ROM_PTR(&bitbangio_spi_unlock_obj) },
+
+    { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&bitbangio_spi_readinto_obj) },
+    { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&bitbangio_spi_write_obj) },
+    { MP_ROM_QSTR(MP_QSTR_write_readinto), MP_ROM_PTR(&bitbangio_spi_write_readinto_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(bitbangio_spi_locals_dict, bitbangio_spi_locals_dict_table);
+
+const mp_obj_type_t bitbangio_spi_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_SPI,
+    .make_new = bitbangio_spi_make_new,
+    .locals_dict = (mp_obj_dict_t *)&bitbangio_spi_locals_dict,
+};