225 lines
6.6 KiB
C
225 lines
6.6 KiB
C
|
// 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>
|
||
|
|
|
||
|
|
#if defined(ESP_IDF_VERSION)
|
||
|
|
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0)
|
||
|
|
#define HAS_ESP_IDF_4
|
||
|
|
#endif
|
||
|
|
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
|
||
|
|
#define HAS_ESP_IDF_5
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef HAS_ESP_IDF_5
|
||
|
|
|
||
|
|
void espShow(uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
|
||
|
|
rmt_data_t led_data[numBytes * 8];
|
||
|
|
|
||
|
|
if (!rmtInit(pin, RMT_TX_MODE, RMT_MEM_NUM_BLOCKS_1, 10000000)) {
|
||
|
|
log_e("Failed to init RMT TX mode on pin %d", pin);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
int i=0;
|
||
|
|
for (int b=0; b < numBytes; b++) {
|
||
|
|
for (int bit=0; bit<8; bit++){
|
||
|
|
if ( pixels[b] & (1<<(7-bit)) ) {
|
||
|
|
led_data[i].level0 = 1;
|
||
|
|
led_data[i].duration0 = 8;
|
||
|
|
led_data[i].level1 = 0;
|
||
|
|
led_data[i].duration1 = 4;
|
||
|
|
} else {
|
||
|
|
led_data[i].level0 = 1;
|
||
|
|
led_data[i].duration0 = 4;
|
||
|
|
led_data[i].level1 = 0;
|
||
|
|
led_data[i].duration1 = 8;
|
||
|
|
}
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//pinMode(pin, OUTPUT); // don't do this, will cause the rmt to disable!
|
||
|
|
rmtWrite(pin, led_data, numBytes * 8, RMT_WAIT_FOR_EVER);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#include "driver/rmt.h"
|
||
|
|
|
||
|
|
|
||
|
|
// 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 // ifndef IDF5
|
||
|
|
|
||
|
|
|
||
|
|
#endif // ifdef(ESP32)
|