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Software/src/lib/adafruit-Adafruit_NeoPixel/esp.c Normal file
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// Implements the RMT peripheral on Espressif SoCs
// Copyright (c) 2020 Lucian Copeland for Adafruit Industries
/* 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.
*/
#if defined(ESP32)
#include <Arduino.h>
#include "driver/rmt.h"
#if defined(ESP_IDF_VERSION)
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0)
#define HAS_ESP_IDF_4
#endif
#endif
// 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)
#define WS2812_T0H_NS (400)
#define WS2812_T0L_NS (850)
#define WS2812_T1H_NS (800)
#define WS2812_T1L_NS (450)
#define WS2811_T0H_NS (500)
#define WS2811_T0L_NS (2000)
#define WS2811_T1H_NS (1200)
#define WS2811_T1L_NS (1300)
static uint32_t t0h_ticks = 0;
static uint32_t t1h_ticks = 0;
static uint32_t t0l_ticks = 0;
static uint32_t t1l_ticks = 0;
// 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
#define RMT_LL_HW_BASE (&RMT)
bool rmt_reserved_channels[ADAFRUIT_RMT_CHANNEL_MAX];
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;
}
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;
}
#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);
// Convert NS timings to ticks
uint32_t counter_clk_hz = 0;
#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
// NS to tick converter
float ratio = (float)counter_clk_hz / 1e9;
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);
}
// Initialize automatic timing translator
rmt_translator_init(config.channel, ws2812_rmt_adapter);
// 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));
// Free channel again
rmt_driver_uninstall(config.channel);
rmt_reserved_channels[channel] = false;
gpio_set_direction(pin, GPIO_MODE_OUTPUT);
}
#endif