4b41fdb586
with the i2c bus operating at 400kHz this achieves a 4.8kHz SPI clock
rate which could be worse.
It accepts the same style of init sequence as displayio.
tested by scoping the pins on the espressif lcd dev kit with a dummy init sequence:
```python
dotclockframebuffer.ioexpander_send_init_sequence(
bus=bus,
i2c_address=expander_addr,
gpio_address=1,
gpio_data_len=1,
gpio_data=0xff,
cs_bit=1,
mosi_bit=3,
clk_bit=2,
init_sequence=init_sequence)
```
57 lines
2.0 KiB
C
57 lines
2.0 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 Scott Shawcroft for Adafruit Industries
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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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#pragma once
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#include "py/obj.h"
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#include "shared-bindings/busio/I2C.h"
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typedef union {
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struct {
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uint8_t addr, data;
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} a8d8;
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struct {
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uint16_t addr, data; // in little endian
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} a16d16;
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struct {
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uint8_t addr;
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uint16_t data; // in little endian
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} __attribute__((packed)) a8d16;
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uint32_t u32;
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} dotclockframebuffer_ioexpander_addr_reg_t;
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typedef struct {
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busio_i2c_obj_t *bus;
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uint8_t i2c_device_address;
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uint8_t i2c_write_size;
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dotclockframebuffer_ioexpander_addr_reg_t addr_reg_shadow;
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uint32_t cs_mask;
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uint32_t mosi_mask;
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uint32_t clk_mask;
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} dotclockframebuffer_ioexpander_spi_bus;
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void dotclockframebuffer_ioexpander_send_init_sequence(dotclockframebuffer_ioexpander_spi_bus *bus, uint8_t *init_sequence, uint16_t init_sequence_len);
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