111 lines
3.9 KiB
C
111 lines
3.9 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) 2016 Robert Foss, Daniel Busch
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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 <stdio.h>
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#include "c_types.h"
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#include "eagle_soc.h"
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#include "user_interface.h"
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#include "espapa102.h"
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#define NOP asm volatile(" nop \n\t")
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static inline void _esp_apa102_send_byte(uint32_t clockPinMask, uint32_t dataPinMask, uint8_t byte) {
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for (uint32_t i = 0; i < 8; i++) {
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if (byte & 0x80) {
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// set data pin high
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GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, dataPinMask);
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} else {
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// set data pin low
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GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, dataPinMask);
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}
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// set clock pin high
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GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, clockPinMask);
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byte <<= 1;
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NOP;
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NOP;
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// set clock pin low
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GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, clockPinMask);
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NOP;
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NOP;
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}
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}
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static inline void _esp_apa102_send_colors(uint32_t clockPinMask, uint32_t dataPinMask, uint8_t *pixels, uint32_t numBytes) {
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for (uint32_t i = 0; i < numBytes / 4; i++) {
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_esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 3] | 0xE0);
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_esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 2]);
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_esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 1]);
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_esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4]);
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}
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}
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static inline void _esp_apa102_start_frame(uint32_t clockPinMask, uint32_t dataPinMask) {
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for (uint32_t i = 0; i < 4; i++) {
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_esp_apa102_send_byte(clockPinMask, dataPinMask, 0x00);
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}
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}
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static inline void _esp_apa102_append_additionial_cycles(uint32_t clockPinMask, uint32_t dataPinMask, uint32_t numBytes) {
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GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, dataPinMask);
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// we need to write some more clock cycles, because each led
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// delays the data by one edge after inverting the clock
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for (uint32_t i = 0; i < numBytes / 8 + ((numBytes / 4) % 2); i++) {
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GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, clockPinMask);
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NOP;
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NOP;
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GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, clockPinMask);
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NOP;
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NOP;
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}
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}
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static inline void _esp_apa102_end_frame(uint32_t clockPinMask, uint32_t dataPinMask) {
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for (uint32_t i = 0; i < 4; i++) {
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_esp_apa102_send_byte(clockPinMask, dataPinMask, 0xFF);
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}
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}
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void esp_apa102_write(uint8_t clockPin, uint8_t dataPin, uint8_t *pixels, uint32_t numBytes) {
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uint32_t clockPinMask, dataPinMask;
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clockPinMask = 1 << clockPin;
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dataPinMask = 1 << dataPin;
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// start the frame
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_esp_apa102_start_frame(clockPinMask, dataPinMask);
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// write pixels
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_esp_apa102_send_colors(clockPinMask, dataPinMask, pixels, numBytes);
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// end the frame
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_esp_apa102_append_additionial_cycles(clockPinMask, dataPinMask, numBytes);
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_esp_apa102_end_frame(clockPinMask, dataPinMask);
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}
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