436 lines
18 KiB
C
436 lines
18 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Noralf Trønnes
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/i2cperipheral/I2CPeripheral.h"
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#include "shared-bindings/time/__init__.h"
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#include "shared-bindings/util.h"
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#include "lib/utils/buffer_helper.h"
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#include "lib/utils/context_manager_helpers.h"
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#include "lib/utils/interrupt_char.h"
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#include "py/mperrno.h"
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#include "py/mphal.h"
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#include "py/obj.h"
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#include "py/objproperty.h"
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#include "py/runtime.h"
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STATIC mp_obj_t mp_obj_new_i2cperipheral_i2c_peripheral_request(i2cperipheral_i2c_peripheral_obj_t *peripheral, uint8_t address, bool is_read, bool is_restart) {
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i2cperipheral_i2c_peripheral_request_obj_t *self = m_new_obj(i2cperipheral_i2c_peripheral_request_obj_t);
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self->base.type = &i2cperipheral_i2c_peripheral_request_type;
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self->peripheral = peripheral;
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self->address = address;
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self->is_read = is_read;
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self->is_restart = is_restart;
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return (mp_obj_t)self;
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}
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//| class I2CPeripheral:
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//| """Two wire serial protocol peripheral"""
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//|
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//| def __init__(self, scl: microcontroller.Pin, sda: microcontroller.Pin, addresses: tuple, smbus: bool = False):
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//| """I2C is a two-wire protocol for communicating between devices.
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//| This implements the peripheral (sensor, secondary) side.
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//|
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//| :param ~microcontroller.Pin scl: The clock pin
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//| :param ~microcontroller.Pin sda: The data pin
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//| :param tuple addresses: The I2C addresses to respond to (how many is hw dependent).
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//| :param bool smbus: Use SMBUS timings if the hardware supports it"""
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//| ...
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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i2cperipheral_i2c_peripheral_obj_t *self = m_new_obj(i2cperipheral_i2c_peripheral_obj_t);
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self->base.type = &i2cperipheral_i2c_peripheral_type;
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enum { ARG_scl, ARG_sda, ARG_addresses, ARG_smbus };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_scl, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_sda, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_addresses, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_smbus, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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const mcu_pin_obj_t* scl = validate_obj_is_free_pin(args[ARG_scl].u_obj);
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const mcu_pin_obj_t* sda = validate_obj_is_free_pin(args[ARG_sda].u_obj);
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mp_obj_iter_buf_t iter_buf;
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mp_obj_t iterable = mp_getiter(args[ARG_addresses].u_obj, &iter_buf);
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mp_obj_t item;
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uint8_t *addresses = NULL;
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unsigned int i = 0;
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while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
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mp_int_t value;
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if (!mp_obj_get_int_maybe(item, &value)) {
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mp_raise_TypeError(translate("can't convert address to int"));
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}
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if (value < 0x00 || value > 0x7f) {
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mp_raise_ValueError(translate("address out of bounds"));
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}
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addresses = m_renew(uint8_t, addresses, i, i + 1);
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addresses[i++] = value;
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}
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if (i == 0) {
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mp_raise_ValueError(translate("addresses is empty"));
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}
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common_hal_i2cperipheral_i2c_peripheral_construct(self, scl, sda, addresses, i, args[ARG_smbus].u_bool);
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return (mp_obj_t)self;
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}
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//| def deinit(self) -> Any:
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//| """Releases control of the underlying hardware so other classes can use it."""
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//| ...
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_obj_deinit(mp_obj_t self_in) {
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mp_check_self(MP_OBJ_IS_TYPE(self_in, &i2cperipheral_i2c_peripheral_type));
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i2cperipheral_i2c_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_i2cperipheral_i2c_peripheral_deinit(self);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_1(i2cperipheral_i2c_peripheral_deinit_obj, i2cperipheral_i2c_peripheral_obj_deinit);
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//| def __enter__(self) -> Any:
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//| """No-op used in Context Managers."""
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//| ...
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//|
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// Provided by context manager helper.
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//| def __exit__(self) -> Any:
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//| """Automatically deinitializes the hardware on context exit. See
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//| :ref:`lifetime-and-contextmanagers` for more info."""
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//| ...
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_obj___exit__(size_t n_args, const mp_obj_t *args) {
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mp_check_self(MP_OBJ_IS_TYPE(args[0], &i2cperipheral_i2c_peripheral_type));
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i2cperipheral_i2c_peripheral_obj_t *self = MP_OBJ_TO_PTR(args[0]);
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common_hal_i2cperipheral_i2c_peripheral_deinit(self);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(i2cperipheral_i2c_peripheral___exit___obj, 4, 4, i2cperipheral_i2c_peripheral_obj___exit__);
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//| def request(self, timeout: float = -1) -> Any:
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//| """Wait for an I2C request.
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//|
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//| :param float timeout: Timeout in seconds. Zero means wait forever, a negative value means check once
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//| :return: I2C Slave Request or None if timeout=-1 and there's no request
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//| :rtype: ~i2cperipheral.I2CPeripheralRequest"""
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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mp_check_self(MP_OBJ_IS_TYPE(pos_args[0], &i2cperipheral_i2c_peripheral_type));
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i2cperipheral_i2c_peripheral_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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if(common_hal_i2cperipheral_i2c_peripheral_deinited(self)) {
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raise_deinited_error();
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}
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enum { ARG_timeout };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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#if MICROPY_PY_BUILTINS_FLOAT
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float f = mp_obj_get_float(args[ARG_timeout].u_obj) * 1000;
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int timeout_ms = (int)f;
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#else
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int timeout_ms = mp_obj_get_int(args[ARG_timeout].u_obj) * 1000;
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#endif
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bool forever = false;
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uint64_t timeout_end = 0;
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if (timeout_ms == 0) {
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forever = true;
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} else if (timeout_ms > 0) {
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timeout_end = common_hal_time_monotonic() + timeout_ms;
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}
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int last_error = 0;
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do {
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uint8_t address;
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bool is_read;
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bool is_restart;
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RUN_BACKGROUND_TASKS;
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if (mp_hal_is_interrupted()) {
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return mp_const_none;
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}
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int status = common_hal_i2cperipheral_i2c_peripheral_is_addressed(self, &address, &is_read, &is_restart);
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if (status < 0) {
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// On error try one more time before bailing out
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if (last_error) {
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mp_raise_OSError(last_error);
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}
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last_error = -status;
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mp_hal_delay_ms(10);
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continue;
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}
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last_error = 0;
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if (status == 0) {
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mp_hal_delay_us(10);
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continue;
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}
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return mp_obj_new_i2cperipheral_i2c_peripheral_request(self, address, is_read, is_restart);
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} while (forever || common_hal_time_monotonic() < timeout_end);
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if (timeout_ms > 0) {
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mp_raise_OSError(MP_ETIMEDOUT);
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(i2cperipheral_i2c_peripheral_request_obj, 1, i2cperipheral_i2c_peripheral_request);
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STATIC const mp_rom_map_elem_t i2cperipheral_i2c_peripheral_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
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{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&i2cperipheral_i2c_peripheral___exit___obj) },
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{ MP_ROM_QSTR(MP_QSTR_request), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(i2cperipheral_i2c_peripheral_locals_dict, i2cperipheral_i2c_peripheral_locals_dict_table);
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const mp_obj_type_t i2cperipheral_i2c_peripheral_type = {
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{ &mp_type_type },
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.name = MP_QSTR_I2CPeripheral,
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.make_new = i2cperipheral_i2c_peripheral_make_new,
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.locals_dict = (mp_obj_dict_t*)&i2cperipheral_i2c_peripheral_locals_dict,
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};
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//| class I2CPeripheralRequest:
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//|
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//| def __init__(self, peripheral: i2cperipheral.I2CPeripheral, address: int, is_read: bool, is_restart: bool):
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//| """Information about an I2C transfer request
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//| This cannot be instantiated directly, but is returned by :py:meth:`I2CPeripheral.request`.
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//|
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//| :param peripheral: The I2CPeripheral object receiving this request
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//| :param address: I2C address
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//| :param is_read: True if the main peripheral is requesting data
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//| :param is_restart: Repeated Start Condition"""
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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mp_arg_check_num(n_args, kw_args, 4, 4, false);
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return mp_obj_new_i2cperipheral_i2c_peripheral_request(args[0], mp_obj_get_int(args[1]), mp_obj_is_true(args[2]), mp_obj_is_true(args[3]));
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}
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//| def __enter__(self) -> Any:
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//| """No-op used in Context Managers."""
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//| ...
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//|
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// Provided by context manager helper.
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//| def __exit__(self) -> Any:
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//| """Close the request."""
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//| ...
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_obj___exit__(size_t n_args, const mp_obj_t *args) {
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mp_check_self(MP_OBJ_IS_TYPE(args[0], &i2cperipheral_i2c_peripheral_request_type));
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i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(args[0]);
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common_hal_i2cperipheral_i2c_peripheral_close(self->peripheral);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(i2cperipheral_i2c_peripheral_request___exit___obj, 4, 4, i2cperipheral_i2c_peripheral_request_obj___exit__);
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//| address: int = ...
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//| """The I2C address of the request."""
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_get_address(mp_obj_t self_in) {
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mp_check_self(MP_OBJ_IS_TYPE(self_in, &i2cperipheral_i2c_peripheral_request_type));
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i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return mp_obj_new_int(self->address);
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}
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MP_DEFINE_CONST_PROP_GET(i2cperipheral_i2c_peripheral_request_address_obj, i2cperipheral_i2c_peripheral_request_get_address);
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//| is_read: bool = ...
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//| """The I2C main controller is reading from this peripheral."""
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_get_is_read(mp_obj_t self_in) {
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mp_check_self(MP_OBJ_IS_TYPE(self_in, &i2cperipheral_i2c_peripheral_request_type));
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i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return mp_obj_new_bool(self->is_read);
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}
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MP_DEFINE_CONST_PROP_GET(i2cperipheral_i2c_peripheral_request_is_read_obj, i2cperipheral_i2c_peripheral_request_get_is_read);
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//| is_restart: bool = ...
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//| """Is Repeated Start Condition."""
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_get_is_restart(mp_obj_t self_in) {
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mp_check_self(MP_OBJ_IS_TYPE(self_in, &i2cperipheral_i2c_peripheral_request_type));
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i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return mp_obj_new_bool(self->is_restart);
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}
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MP_DEFINE_CONST_PROP_GET(i2cperipheral_i2c_peripheral_request_is_restart_obj, i2cperipheral_i2c_peripheral_request_get_is_restart);
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//| def read(self, n: int = -1, ack: bool = True) -> bytearray:
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//| """Read data.
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//| If ack=False, the caller is responsible for calling :py:meth:`I2CPeripheralRequest.ack`.
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//|
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//| :param n: Number of bytes to read (negative means all)
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//| :param ack: Whether or not to send an ACK after the n'th byte
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//| :return: Bytes read"""
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//| ...
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_read(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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mp_check_self(MP_OBJ_IS_TYPE(pos_args[0], &i2cperipheral_i2c_peripheral_request_type));
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i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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enum { ARG_n, ARG_ack };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_n, MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_ack, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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if (self->is_read) {
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mp_raise_OSError(MP_EACCES);
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}
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int n = args[ARG_n].u_int;
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if (n == 0) {
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return mp_obj_new_bytearray(0, NULL);
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}
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bool ack = args[ARG_ack].u_bool;
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int i = 0;
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uint8_t *buffer = NULL;
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uint64_t timeout_end = common_hal_time_monotonic() + 10 * 1000;
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while (common_hal_time_monotonic() < timeout_end) {
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RUN_BACKGROUND_TASKS;
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if (mp_hal_is_interrupted()) {
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break;
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}
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uint8_t data;
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int num = common_hal_i2cperipheral_i2c_peripheral_read_byte(self->peripheral, &data);
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if (num == 0) {
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break;
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}
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buffer = m_renew(uint8_t, buffer, i, i + 1);
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buffer[i++] = data;
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if (i == n) {
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if (ack) {
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common_hal_i2cperipheral_i2c_peripheral_ack(self->peripheral, true);
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}
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break;
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}
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common_hal_i2cperipheral_i2c_peripheral_ack(self->peripheral, true);
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}
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return mp_obj_new_bytearray(i, buffer);
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(i2cperipheral_i2c_peripheral_request_read_obj, 1, i2cperipheral_i2c_peripheral_request_read);
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//| def write(self, buffer: bytearray) -> int:
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//| """Write the data contained in buffer.
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//|
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//| :param buffer: Write out the data in this buffer
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//| :return: Number of bytes written"""
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//| ...
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//|
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STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_write(mp_obj_t self_in, mp_obj_t buf_in) {
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mp_check_self(MP_OBJ_IS_TYPE(self_in, &i2cperipheral_i2c_peripheral_request_type));
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i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(self_in);
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if (!self->is_read) {
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mp_raise_OSError(MP_EACCES);
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}
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
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for (size_t i = 0; i < bufinfo.len; i++) {
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RUN_BACKGROUND_TASKS;
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if (mp_hal_is_interrupted()) {
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break;
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}
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int num = common_hal_i2cperipheral_i2c_peripheral_write_byte(self->peripheral, ((uint8_t *)(bufinfo.buf))[i]);
|
|
if (num == 0) {
|
|
return mp_obj_new_int(i);
|
|
}
|
|
}
|
|
|
|
return mp_obj_new_int(bufinfo.len);
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_2(i2cperipheral_i2c_peripheral_request_write_obj, i2cperipheral_i2c_peripheral_request_write);
|
|
|
|
//| def ack(self, ack: bool = True) -> Any:
|
|
//| """Acknowledge or Not Acknowledge last byte received.
|
|
//| Use together with :py:meth:`I2CPeripheralRequest.read` ack=False.
|
|
//|
|
|
//| :param ack: Whether to send an ACK or NACK"""
|
|
//| ...
|
|
//|
|
|
STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_ack(uint n_args, const mp_obj_t *args) {
|
|
mp_check_self(MP_OBJ_IS_TYPE(args[0], &i2cperipheral_i2c_peripheral_request_type));
|
|
i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(args[0]);
|
|
bool ack = (n_args == 1) ? true : mp_obj_is_true(args[1]);
|
|
|
|
if (self->is_read) {
|
|
mp_raise_OSError(MP_EACCES);
|
|
}
|
|
|
|
common_hal_i2cperipheral_i2c_peripheral_ack(self->peripheral, ack);
|
|
return mp_const_none;
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(i2cperipheral_i2c_peripheral_request_ack_obj, 1, 2, i2cperipheral_i2c_peripheral_request_ack);
|
|
|
|
STATIC mp_obj_t i2cperipheral_i2c_peripheral_request_close(mp_obj_t self_in) {
|
|
mp_check_self(MP_OBJ_IS_TYPE(self_in, &i2cperipheral_i2c_peripheral_request_type));
|
|
i2cperipheral_i2c_peripheral_request_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
|
|
common_hal_i2cperipheral_i2c_peripheral_close(self->peripheral);
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_1(i2cperipheral_i2c_peripheral_request_close_obj, i2cperipheral_i2c_peripheral_request_close);
|
|
|
|
STATIC const mp_rom_map_elem_t i2cperipheral_i2c_peripheral_request_locals_dict_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request___exit___obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_address), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_address_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_is_read), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_is_read_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_is_restart), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_is_restart_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_read_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_write_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_ack), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_ack_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_request_close_obj) },
|
|
};
|
|
|
|
STATIC MP_DEFINE_CONST_DICT(i2cperipheral_i2c_peripheral_request_locals_dict, i2cperipheral_i2c_peripheral_request_locals_dict_table);
|
|
|
|
const mp_obj_type_t i2cperipheral_i2c_peripheral_request_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_I2CPeripheralRequest,
|
|
.make_new = i2cperipheral_i2c_peripheral_request_make_new,
|
|
.locals_dict = (mp_obj_dict_t*)&i2cperipheral_i2c_peripheral_request_locals_dict,
|
|
};
|