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Merge pull request #20 from badgeteam/renze/ws2812-as-module

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Move WS2812 driver to it's own repository
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Renze Nicolai 2022-05-12 00:33:53 +02:00 committed by GitHub
parent aee7d06c97 4bf7a3c89b
commit 28123c8b62
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 4 additions and 163 deletions
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3
.gitmodules vendored
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@ -22,3 +22,6 @@
[submodule "components/mch2022-rp2040"]
path = components/mch2022-rp2040
url = https://github.com/badgeteam/esp32-component-mch2022-rp2040.git
[submodule "components/ws2812"]
path = components/ws2812
url = https://github.com/badgeteam/esp32-component-ws2812.git

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components/ws2812 Submodule

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Subproject commit c1c750d2ce0a487622fb311cce19ea899d49ffe6

4
components/ws2812/CMakeLists.txt
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idf_component_register(
SRCS "ws2812.c"
INCLUDE_DIRS include
)

35
components/ws2812/include/ws2812.h
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#pragma once
#include <stdint.h>
#include <esp_err.h>
#include <driver/gpio.h>
__BEGIN_DECLS
/**
* Initialize the leds driver. (configure SPI bus and GPIO pins)
* @return ESP_OK on success; any other value indicates an error
*/
extern esp_err_t ws2812_init(gpio_num_t aGpioPin);
/**
* Enable power to the leds bar.
* @return ESP_OK on success; any other value indicates an error
*/
extern esp_err_t ws2812_enable(int gpio_pin);
/**
* Disable power to the leds bar.
* @return ESP_OK on success; any other value indicates an error
*/
extern esp_err_t ws2812_disable(void);
/**
* Send color-data to the leds bus.
* @param data the data-bytes to send on the bus.
* @param len the data-length.
* @return ESP_OK on success; any other value indicates an error
*/
extern esp_err_t ws2812_send_data(uint8_t *data, int len);
__END_DECLS

124
components/ws2812/ws2812.c
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//This driver uses the ESP32 RMT peripheral to drive "Neopixel" compatible LEDs
//The usage of the RMT peripheral has been implemented using work by JSchaenzie:
//you can find his work at https://github.com/JSchaenzle/ESP32-NeoPixel-WS2812-RMT
#include <sdkconfig.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <esp_err.h>
#include <esp_log.h>
#include <driver/gpio.h>
#include <driver/rmt.h>
static const char *TAG = "ws2812";
#define WS2812_RMT_CHANNEL RMT_CHANNEL_0
#define T0H 14 // 0 bit high time
#define T1H 52 // 1 bit high time
#define TL 52 // low time for either bit
static bool gActive = false;
rmt_item32_t* gBuffer = NULL;
int gBufferLength = 0;
gpio_num_t gPin;
esp_err_t ws2812_init(gpio_num_t aGpioPin) {
if (gActive) return ESP_OK;
gpio_config_t io_conf = {
.intr_type = GPIO_INTR_DISABLE,
.mode = GPIO_MODE_OUTPUT,
.pin_bit_mask = 1LL << aGpioPin,
.pull_down_en = 0,
.pull_up_en = 0,
};
esp_err_t res = gpio_config(&io_conf);
if (res != ESP_OK) return res;
rmt_config_t config;
config.rmt_mode = RMT_MODE_TX;
config.channel = WS2812_RMT_CHANNEL;
config.gpio_num = aGpioPin;
config.mem_block_num = 3;
config.tx_config.loop_en = false;
config.tx_config.carrier_en = false;
config.tx_config.idle_output_en = true;
config.tx_config.idle_level = 0;
config.clk_div = 2;
res = rmt_config(&config);
if (res != ESP_OK) return res;
res = rmt_driver_install(config.channel, 0, 0);
if (res != ESP_OK) return res;
gActive = true;
gPin = aGpioPin;
return ESP_OK;
}
esp_err_t ws2812_deinit(void) {
if (!gActive) return ESP_OK;
esp_err_t res = rmt_driver_uninstall(WS2812_RMT_CHANNEL);
if (res != ESP_OK) return res;
gpio_config_t io_conf = {
.intr_type = GPIO_INTR_DISABLE,
.mode = GPIO_MODE_INPUT,
.pin_bit_mask = 1LL << gPin,
.pull_down_en = 0,
.pull_up_en = 0,
};
res = gpio_config(&io_conf);
if (res != ESP_OK) return res;
gActive = false;
return ESP_OK;
}
esp_err_t ws2812_prepare_data(uint8_t *data, int len)
{
if (gBuffer != NULL) return ESP_FAIL;
gBuffer = calloc(len * 8, sizeof(rmt_item32_t));
if (gBuffer == NULL) return ESP_FAIL;
gBufferLength = len * 8;
for (uint32_t pos = 0; pos < len; pos++) {
uint32_t mask = 1 << 7;
for (uint8_t i = 0; i < 8; i++) {
bool bit = data[pos] & mask;
gBuffer[pos*8 + i] = bit ?
(rmt_item32_t){{{T1H, 1, TL, 0}}} :
(rmt_item32_t){{{T0H, 1, TL, 0}}};
mask >>= 1;
}
}
return ESP_OK;
}
esp_err_t ws2812_free_data() {
if (!gBuffer) return ESP_FAIL;
free(gBuffer);
gBuffer = NULL;
gBufferLength = 0;
return ESP_OK;
}
esp_err_t ws2812_send_data(uint8_t *data, int len)
{
if (!gActive) return ESP_FAIL;
esp_err_t res = ws2812_prepare_data(data, len);
if (res != ESP_OK) return res;
res = rmt_write_items(WS2812_RMT_CHANNEL, gBuffer, gBufferLength, false);
if (res != ESP_OK) {
ws2812_free_data();
return res;
}
res = rmt_wait_tx_done(WS2812_RMT_CHANNEL, portMAX_DELAY);
if (res != ESP_OK) {
ws2812_free_data();
return res;
}
res = ws2812_free_data();
return res;
}