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modmachinewdt.c

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  • espapa102.c 3.94 KiB
    /*
     * This file is part of the MicroPython project, http://micropython.org/
     *
     * The MIT License (MIT)
     *
     * Copyright (c) 2016 Robert Foss, Daniel Busch
     *
     * 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 <stdio.h>
    #include "c_types.h"
    #include "eagle_soc.h"
    #include "user_interface.h"
    #include "espapa102.h"
    
    #define NOP asm volatile(" nop \n\t")
    
    static inline void _esp_apa102_send_byte(uint32_t clockPinMask, uint32_t dataPinMask, uint8_t byte) {
        for (uint32_t i = 0; i < 8; i++) {
            if (byte & 0x80) {
                // set data pin high
                GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, dataPinMask);
            } else {
                // set data pin low
                GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, dataPinMask);
            }
    
            // set clock pin high
            GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, clockPinMask);
            byte <<= 1;
            NOP;
            NOP;
    
            // set clock pin low
            GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, clockPinMask);
            NOP;
            NOP;
        }
    }
    
    static inline void _esp_apa102_send_colors(uint32_t clockPinMask, uint32_t dataPinMask, uint8_t *pixels, uint32_t numBytes) {
        for (uint32_t i = 0; i < numBytes / 4; i++) {
            _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 3] | 0xE0);
            _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 2]);
            _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 1]);
            _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4]);
        }
    }
    
    static inline void _esp_apa102_start_frame(uint32_t clockPinMask, uint32_t dataPinMask) {
        for (uint32_t i = 0; i < 4; i++) {
            _esp_apa102_send_byte(clockPinMask, dataPinMask, 0x00);
        }
    }
    
    static inline void _esp_apa102_append_additionial_cycles(uint32_t clockPinMask, uint32_t dataPinMask, uint32_t numBytes) {
        GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, dataPinMask);
    
        // we need to write some more clock cycles, because each led
        // delays the data by one edge after inverting the clock
        for (uint32_t i = 0; i < numBytes / 8 + ((numBytes / 4) % 2); i++) {
            GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, clockPinMask);
            NOP;
            NOP;
    
            GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, clockPinMask);
            NOP;
            NOP;
        }
    }
    
    static inline void _esp_apa102_end_frame(uint32_t clockPinMask, uint32_t dataPinMask) {
        for (uint32_t i = 0; i < 4; i++) {
            _esp_apa102_send_byte(clockPinMask, dataPinMask, 0xFF);
        }
    }
    
    void esp_apa102_write(uint8_t clockPin, uint8_t dataPin, uint8_t *pixels, uint32_t numBytes) {
        uint32_t clockPinMask, dataPinMask;
    
        clockPinMask = 1 << clockPin;
        dataPinMask = 1 << dataPin;
    
        // start the frame
        _esp_apa102_start_frame(clockPinMask, dataPinMask);
    
        // write pixels
        _esp_apa102_send_colors(clockPinMask, dataPinMask, pixels, numBytes);
    
        // end the frame
        _esp_apa102_append_additionial_cycles(clockPinMask, dataPinMask, numBytes);
        _esp_apa102_end_frame(clockPinMask, dataPinMask);
    }