225 lines
6.6 KiB
C
225 lines
6.6 KiB
C
// Implements the RMT peripheral on Espressif SoCs
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// Copyright (c) 2020 Lucian Copeland for Adafruit Industries
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/* Uses code from Espressif RGB LED Strip demo and drivers
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* Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if defined(ESP32)
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#include <Arduino.h>
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#if defined(ESP_IDF_VERSION)
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#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0)
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#define HAS_ESP_IDF_4
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#endif
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#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
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#define HAS_ESP_IDF_5
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#endif
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#endif
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#ifdef HAS_ESP_IDF_5
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void espShow(uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
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rmt_data_t led_data[numBytes * 8];
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if (!rmtInit(pin, RMT_TX_MODE, RMT_MEM_NUM_BLOCKS_1, 10000000)) {
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log_e("Failed to init RMT TX mode on pin %d", pin);
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return;
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}
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int i=0;
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for (int b=0; b < numBytes; b++) {
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for (int bit=0; bit<8; bit++){
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if ( pixels[b] & (1<<(7-bit)) ) {
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led_data[i].level0 = 1;
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led_data[i].duration0 = 8;
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led_data[i].level1 = 0;
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led_data[i].duration1 = 4;
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} else {
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led_data[i].level0 = 1;
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led_data[i].duration0 = 4;
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led_data[i].level1 = 0;
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led_data[i].duration1 = 8;
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}
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i++;
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}
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}
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//pinMode(pin, OUTPUT); // don't do this, will cause the rmt to disable!
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rmtWrite(pin, led_data, numBytes * 8, RMT_WAIT_FOR_EVER);
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}
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#else
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#include "driver/rmt.h"
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// This code is adapted from the ESP-IDF v3.4 RMT "led_strip" example, altered
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// to work with the Arduino version of the ESP-IDF (3.2)
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#define WS2812_T0H_NS (400)
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#define WS2812_T0L_NS (850)
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#define WS2812_T1H_NS (800)
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#define WS2812_T1L_NS (450)
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#define WS2811_T0H_NS (500)
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#define WS2811_T0L_NS (2000)
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#define WS2811_T1H_NS (1200)
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#define WS2811_T1L_NS (1300)
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static uint32_t t0h_ticks = 0;
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static uint32_t t1h_ticks = 0;
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static uint32_t t0l_ticks = 0;
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static uint32_t t1l_ticks = 0;
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// Limit the number of RMT channels available for the Neopixels. Defaults to all
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// channels (8 on ESP32, 4 on ESP32-S2 and S3). Redefining this value will free
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// any channels with a higher number for other uses, such as IR send-and-recieve
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// libraries. Redefine as 1 to restrict Neopixels to only a single channel.
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#define ADAFRUIT_RMT_CHANNEL_MAX RMT_CHANNEL_MAX
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#define RMT_LL_HW_BASE (&RMT)
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bool rmt_reserved_channels[ADAFRUIT_RMT_CHANNEL_MAX];
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static void IRAM_ATTR ws2812_rmt_adapter(const void *src, rmt_item32_t *dest, size_t src_size,
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size_t wanted_num, size_t *translated_size, size_t *item_num)
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{
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if (src == NULL || dest == NULL) {
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*translated_size = 0;
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*item_num = 0;
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return;
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}
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const rmt_item32_t bit0 = {{{ t0h_ticks, 1, t0l_ticks, 0 }}}; //Logical 0
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const rmt_item32_t bit1 = {{{ t1h_ticks, 1, t1l_ticks, 0 }}}; //Logical 1
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size_t size = 0;
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size_t num = 0;
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uint8_t *psrc = (uint8_t *)src;
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rmt_item32_t *pdest = dest;
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while (size < src_size && num < wanted_num) {
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for (int i = 0; i < 8; i++) {
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// MSB first
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if (*psrc & (1 << (7 - i))) {
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pdest->val = bit1.val;
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} else {
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pdest->val = bit0.val;
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}
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num++;
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pdest++;
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}
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size++;
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psrc++;
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}
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*translated_size = size;
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*item_num = num;
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}
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void espShow(uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
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// Reserve channel
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rmt_channel_t channel = ADAFRUIT_RMT_CHANNEL_MAX;
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for (size_t i = 0; i < ADAFRUIT_RMT_CHANNEL_MAX; i++) {
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if (!rmt_reserved_channels[i]) {
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rmt_reserved_channels[i] = true;
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channel = i;
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break;
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}
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}
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if (channel == ADAFRUIT_RMT_CHANNEL_MAX) {
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// Ran out of channels!
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return;
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}
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#if defined(HAS_ESP_IDF_4)
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rmt_config_t config = RMT_DEFAULT_CONFIG_TX(pin, channel);
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config.clk_div = 2;
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#else
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// Match default TX config from ESP-IDF version 3.4
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rmt_config_t config = {
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.rmt_mode = RMT_MODE_TX,
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.channel = channel,
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.gpio_num = pin,
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.clk_div = 2,
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.mem_block_num = 1,
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.tx_config = {
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.carrier_freq_hz = 38000,
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.carrier_level = RMT_CARRIER_LEVEL_HIGH,
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.idle_level = RMT_IDLE_LEVEL_LOW,
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.carrier_duty_percent = 33,
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.carrier_en = false,
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.loop_en = false,
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.idle_output_en = true,
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}
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};
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#endif
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rmt_config(&config);
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rmt_driver_install(config.channel, 0, 0);
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// Convert NS timings to ticks
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uint32_t counter_clk_hz = 0;
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#if defined(HAS_ESP_IDF_4)
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rmt_get_counter_clock(channel, &counter_clk_hz);
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#else
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// this emulates the rmt_get_counter_clock() function from ESP-IDF 3.4
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if (RMT_LL_HW_BASE->conf_ch[config.channel].conf1.ref_always_on == RMT_BASECLK_REF) {
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uint32_t div_cnt = RMT_LL_HW_BASE->conf_ch[config.channel].conf0.div_cnt;
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uint32_t div = div_cnt == 0 ? 256 : div_cnt;
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counter_clk_hz = REF_CLK_FREQ / (div);
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} else {
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uint32_t div_cnt = RMT_LL_HW_BASE->conf_ch[config.channel].conf0.div_cnt;
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uint32_t div = div_cnt == 0 ? 256 : div_cnt;
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counter_clk_hz = APB_CLK_FREQ / (div);
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}
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#endif
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// NS to tick converter
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float ratio = (float)counter_clk_hz / 1e9;
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if (is800KHz) {
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t0h_ticks = (uint32_t)(ratio * WS2812_T0H_NS);
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t0l_ticks = (uint32_t)(ratio * WS2812_T0L_NS);
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t1h_ticks = (uint32_t)(ratio * WS2812_T1H_NS);
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t1l_ticks = (uint32_t)(ratio * WS2812_T1L_NS);
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} else {
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t0h_ticks = (uint32_t)(ratio * WS2811_T0H_NS);
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t0l_ticks = (uint32_t)(ratio * WS2811_T0L_NS);
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t1h_ticks = (uint32_t)(ratio * WS2811_T1H_NS);
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t1l_ticks = (uint32_t)(ratio * WS2811_T1L_NS);
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}
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// Initialize automatic timing translator
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rmt_translator_init(config.channel, ws2812_rmt_adapter);
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// Write and wait to finish
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rmt_write_sample(config.channel, pixels, (size_t)numBytes, true);
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rmt_wait_tx_done(config.channel, pdMS_TO_TICKS(100));
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// Free channel again
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rmt_driver_uninstall(config.channel);
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rmt_reserved_channels[channel] = false;
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gpio_set_direction(pin, GPIO_MODE_OUTPUT);
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}
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#endif // ifndef IDF5
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#endif // ifdef(ESP32)
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