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Diffstat (limited to 'circuitpython/shared-bindings/i2cperipheral/__init__.c')
| -rw-r--r-- | circuitpython/shared-bindings/i2cperipheral/__init__.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/circuitpython/shared-bindings/i2cperipheral/__init__.c b/circuitpython/shared-bindings/i2cperipheral/__init__.c new file mode 100644 index 0000000..fde7002 --- /dev/null +++ b/circuitpython/shared-bindings/i2cperipheral/__init__.c @@ -0,0 +1,108 @@ +/* + * This file is part of the MicroPython project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2018 Noralf Trønnes + * + * 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 <stdint.h> + +#include "py/obj.h" +#include "py/runtime.h" + +#include "shared-bindings/microcontroller/Pin.h" +// #include "shared-bindings/i2cperipheral/__init__.h" +#include "shared-bindings/i2cperipheral/I2CPeripheral.h" + +#include "py/runtime.h" + +//| """Two wire serial protocol peripheral +//| +//| The `i2cperipheral` module contains classes to support an I2C peripheral. +//| +//| Example emulating a peripheral with 2 addresses (read and write):: +//| +//| import board +//| from i2cperipheral import I2CPeripheral +//| +//| regs = [0] * 16 +//| index = 0 +//| +//| with I2CPeripheral(board.SCL, board.SDA, (0x40, 0x41)) as device: +//| while True: +//| r = device.request() +//| if not r: +//| # Maybe do some housekeeping +//| continue +//| with r: # Closes the transfer if necessary by sending a NACK or feeding dummy bytes +//| if r.address == 0x40: +//| if not r.is_read: # Main write which is Selected read +//| b = r.read(1) +//| if not b or b[0] > 15: +//| break +//| index = b[0] +//| b = r.read(1) +//| if b: +//| regs[index] = b[0] +//| elif r.is_restart: # Combined transfer: This is the Main read message +//| n = r.write(bytes([regs[index]])) +//| #else: +//| # A read transfer is not supported in this example +//| # If the microcontroller tries, it will get 0xff byte(s) by the ctx manager (r.close()) +//| elif r.address == 0x41: +//| if not r.is_read: +//| b = r.read(1) +//| if b and b[0] == 0xde: +//| # do something +//| pass +//| +//| This example sets up an I2C device that can be accessed from Linux like this:: +//| +//| $ i2cget -y 1 0x40 0x01 +//| 0x00 +//| $ i2cset -y 1 0x40 0x01 0xaa +//| $ i2cget -y 1 0x40 0x01 +//| 0xaa +//| +//| .. warning:: +//| I2CPeripheral makes use of clock stretching in order to slow down +//| the host. +//| Make sure the I2C host supports this. +//| +//| Raspberry Pi in particular does not support this with its I2C hw block. +//| This can be worked around by using the ``i2c-gpio`` bit banging driver. +//| Since the RPi firmware uses the hw i2c, it's not possible to emulate a HAT eeprom.""" +//| + +STATIC const mp_rom_map_elem_t i2cperipheral_module_globals_table[] = { + { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_i2cperipheral) }, + { MP_ROM_QSTR(MP_QSTR_I2CPeripheral), MP_ROM_PTR(&i2cperipheral_i2c_peripheral_type) }, +}; + +STATIC MP_DEFINE_CONST_DICT(i2cperipheral_module_globals, i2cperipheral_module_globals_table); + +const mp_obj_module_t i2cperipheral_module = { + .base = { &mp_type_module }, + .globals = (mp_obj_dict_t *)&i2cperipheral_module_globals, +}; + +MP_REGISTER_MODULE(MP_QSTR_i2cperipheral, i2cperipheral_module, CIRCUITPY_I2CPERIPHERAL); |