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ESP32-C3 upgrade for Standalone Edition: bringup of Wi-Fi, GNSS, SX12…
…xx radio, BMP280 sensor, LED ring, buzzer and BLE is complete
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Linar Yusupov
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Feb 9, 2023
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software/firmware/source/libraries/Adafruit_NeoPixel/esp.c
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| Original file line number | Diff line number | Diff line change |
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| // Implements the RMT peripheral on Espressif SoCs | ||
| // Copyright (c) 2020 Lucian Copeland for Adafruit Industries | ||
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| /* Uses code from Espressif RGB LED Strip demo and drivers | ||
| * Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| #if defined(ESP32) | ||
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| #include <Arduino.h> | ||
| #include "driver/rmt.h" | ||
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| #if defined(ESP_IDF_VERSION) | ||
| #if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0) | ||
| #define HAS_ESP_IDF_4 | ||
| #endif | ||
| #endif | ||
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| // This code is adapted from the ESP-IDF v3.4 RMT "led_strip" example, altered | ||
| // to work with the Arduino version of the ESP-IDF (3.2) | ||
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| #define WS2812_T0H_NS (400) | ||
| #define WS2812_T0L_NS (850) | ||
| #define WS2812_T1H_NS (800) | ||
| #define WS2812_T1L_NS (450) | ||
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| #define WS2811_T0H_NS (500) | ||
| #define WS2811_T0L_NS (2000) | ||
| #define WS2811_T1H_NS (1200) | ||
| #define WS2811_T1L_NS (1300) | ||
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| static uint32_t t0h_ticks = 0; | ||
| static uint32_t t1h_ticks = 0; | ||
| static uint32_t t0l_ticks = 0; | ||
| static uint32_t t1l_ticks = 0; | ||
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| // Limit the number of RMT channels available for the Neopixels. Defaults to all | ||
| // channels (8 on ESP32, 4 on ESP32-S2 and S3). Redefining this value will free | ||
| // any channels with a higher number for other uses, such as IR send-and-recieve | ||
| // libraries. Redefine as 1 to restrict Neopixels to only a single channel. | ||
| #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, | ||
| size_t wanted_num, size_t *translated_size, size_t *item_num) | ||
| { | ||
| if (src == NULL || dest == NULL) { | ||
| *translated_size = 0; | ||
| *item_num = 0; | ||
| return; | ||
| } | ||
| const rmt_item32_t bit0 = {{{ t0h_ticks, 1, t0l_ticks, 0 }}}; //Logical 0 | ||
| const rmt_item32_t bit1 = {{{ t1h_ticks, 1, t1l_ticks, 0 }}}; //Logical 1 | ||
| size_t size = 0; | ||
| size_t num = 0; | ||
| uint8_t *psrc = (uint8_t *)src; | ||
| rmt_item32_t *pdest = dest; | ||
| while (size < src_size && num < wanted_num) { | ||
| for (int i = 0; i < 8; i++) { | ||
| // MSB first | ||
| if (*psrc & (1 << (7 - i))) { | ||
| pdest->val = bit1.val; | ||
| } else { | ||
| pdest->val = bit0.val; | ||
| } | ||
| num++; | ||
| pdest++; | ||
| } | ||
| size++; | ||
| psrc++; | ||
| } | ||
| *translated_size = size; | ||
| *item_num = num; | ||
| } | ||
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| void espShow(uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) { | ||
| // Reserve channel | ||
| rmt_channel_t channel = ADAFRUIT_RMT_CHANNEL_MAX; | ||
| for (size_t i = 0; i < ADAFRUIT_RMT_CHANNEL_MAX; i++) { | ||
| if (!rmt_reserved_channels[i]) { | ||
| rmt_reserved_channels[i] = true; | ||
| channel = i; | ||
| break; | ||
| } | ||
| } | ||
| if (channel == ADAFRUIT_RMT_CHANNEL_MAX) { | ||
| // Ran out of channels! | ||
| return; | ||
| } | ||
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| #if defined(HAS_ESP_IDF_4) | ||
| rmt_config_t config = RMT_DEFAULT_CONFIG_TX(pin, channel); | ||
| config.clk_div = 2; | ||
| #else | ||
| // Match default TX config from ESP-IDF version 3.4 | ||
| rmt_config_t config = { | ||
| .rmt_mode = RMT_MODE_TX, | ||
| .channel = channel, | ||
| .gpio_num = pin, | ||
| .clk_div = 2, | ||
| .mem_block_num = 1, | ||
| .tx_config = { | ||
| .carrier_freq_hz = 38000, | ||
| .carrier_level = RMT_CARRIER_LEVEL_HIGH, | ||
| .idle_level = RMT_IDLE_LEVEL_LOW, | ||
| .carrier_duty_percent = 33, | ||
| .carrier_en = false, | ||
| .loop_en = false, | ||
| .idle_output_en = true, | ||
| } | ||
| }; | ||
| #endif | ||
| rmt_config(&config); | ||
| rmt_driver_install(config.channel, 0, 0); | ||
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| // Convert NS timings to ticks | ||
| uint32_t counter_clk_hz = 0; | ||
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| #if defined(HAS_ESP_IDF_4) | ||
| rmt_get_counter_clock(channel, &counter_clk_hz); | ||
| #else | ||
| // this emulates the rmt_get_counter_clock() function from ESP-IDF 3.4 | ||
| if (RMT_LL_HW_BASE->conf_ch[config.channel].conf1.ref_always_on == RMT_BASECLK_REF) { | ||
| uint32_t div_cnt = RMT_LL_HW_BASE->conf_ch[config.channel].conf0.div_cnt; | ||
| uint32_t div = div_cnt == 0 ? 256 : div_cnt; | ||
| counter_clk_hz = REF_CLK_FREQ / (div); | ||
| } else { | ||
| uint32_t div_cnt = RMT_LL_HW_BASE->conf_ch[config.channel].conf0.div_cnt; | ||
| uint32_t div = div_cnt == 0 ? 256 : div_cnt; | ||
| counter_clk_hz = APB_CLK_FREQ / (div); | ||
| } | ||
| #endif | ||
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| // NS to tick converter | ||
| float ratio = (float)counter_clk_hz / 1e9; | ||
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| if (is800KHz) { | ||
| t0h_ticks = (uint32_t)(ratio * WS2812_T0H_NS); | ||
| t0l_ticks = (uint32_t)(ratio * WS2812_T0L_NS); | ||
| t1h_ticks = (uint32_t)(ratio * WS2812_T1H_NS); | ||
| t1l_ticks = (uint32_t)(ratio * WS2812_T1L_NS); | ||
| } else { | ||
| t0h_ticks = (uint32_t)(ratio * WS2811_T0H_NS); | ||
| t0l_ticks = (uint32_t)(ratio * WS2811_T0L_NS); | ||
| t1h_ticks = (uint32_t)(ratio * WS2811_T1H_NS); | ||
| t1l_ticks = (uint32_t)(ratio * WS2811_T1L_NS); | ||
| } | ||
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| // Initialize automatic timing translator | ||
| rmt_translator_init(config.channel, ws2812_rmt_adapter); | ||
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| // Write and wait to finish | ||
| rmt_write_sample(config.channel, pixels, (size_t)numBytes, true); | ||
| rmt_wait_tx_done(config.channel, pdMS_TO_TICKS(100)); | ||
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| // Free channel again | ||
| rmt_driver_uninstall(config.channel); | ||
| rmt_reserved_channels[channel] = false; | ||
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| gpio_set_direction(pin, GPIO_MODE_OUTPUT); | ||
| } | ||
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| #endif |
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