95 lines
3.0 KiB
C
95 lines
3.0 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 hathach 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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#include "py/mphal.h"
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#include "shared-bindings/neopixel_write/__init__.h"
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#include "csr.h"
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// ICE40 LED Driver hard macro.
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// See http://www.latticesemi.com/-/media/LatticeSemi/Documents/ApplicationNotes/IK/ICE40LEDDriverUsageGuide.ashx?document_id=50668
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enum led_registers {
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LEDDCR0 = 8,
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LEDDBR = 9,
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LEDDONR = 10,
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LEDDOFR = 11,
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LEDDBCRR = 5,
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LEDDBCFR = 6,
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LEDDPWRR = 1,
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LEDDPWRG = 2,
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LEDDPWRB = 3,
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};
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// Control register definitions
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#define LEDDCR0_LEDDEN (1 << 7)
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#define LEDDCR0_FR250 (1 << 6)
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#define LEDDCR0_OUTPOL (1 << 5)
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#define LEDDCR0_OUTSKEW (1 << 4)
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#define LEDDCR0_QUICKSTOP (1 << 3)
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#define LEDDCR0_PWM_MODE (1 << 2)
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#define LEDDCR0_BRMSBEXT (1 << 0)
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// Write a value into the LEDDA_IP register.
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static void ledda_write(uint8_t value, uint8_t addr) {
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rgb_addr_write(addr);
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rgb_dat_write(value);
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}
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static int ledda_init_done;
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static void ledda_init(void) {
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if (ledda_init_done) {
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return;
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}
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// Enable the driver
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rgb_ctrl_write((1 << CSR_RGB_CTRL_EXE_OFFSET) | (1 << CSR_RGB_CTRL_CURREN_OFFSET) | (1 << CSR_RGB_CTRL_RGBLEDEN_OFFSET));
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ledda_write(LEDDCR0_LEDDEN | LEDDCR0_FR250 | LEDDCR0_QUICKSTOP, LEDDCR0);
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// Set clock register to 12 MHz / 64 kHz - 1
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ledda_write((12000000 / 64000) - 1, LEDDBR);
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// Ensure LED "breathe" effect is diabled
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ledda_write(0, LEDDBCRR);
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ledda_write(0, LEDDBCFR);
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// Also disable the LED blink time
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ledda_write(0, LEDDONR);
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ledda_write(0, LEDDOFR);
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ledda_init_done = 1;
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}
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void common_hal_neopixel_write(const digitalio_digitalinout_obj_t *digitalinout, uint8_t *pixels, uint32_t numBytes) {
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(void)digitalinout;
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(void)numBytes;
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ledda_init();
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ledda_write(pixels[0], LEDDPWRR); // Red
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ledda_write(pixels[1], LEDDPWRG); // Green
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ledda_write(pixels[2], LEDDPWRB); // Blue
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}
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