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编程入门教程（arduino-esp32c3）- SPI引脚设置 - wukong - 03-23-2024
根据esp32环境配置安装，打开默认文件目录如下
C:\Users\Administrator\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.0-alpha3\variants\esp32c3
上面目录中3.0.0-alpha3改成自己的版本，安装版本会有不同
修改内部的pins_arduino.h
#ifndef Pins_Arduino_h
#define Pins_Arduino_h
#include <stdint.h>
#include "soc/soc_caps.h"
#define PIN_NEOPIXEL 8
// BUILTIN_LED can be used in new Arduino API digitalWrite() like in Blink.ino
static const uint8_t LED_BUILTIN = SOC_GPIO_PIN_COUNT+PIN_NEOPIXEL;
#define BUILTIN_LED LED_BUILTIN // backward compatibility
#define LED_BUILTIN LED_BUILTIN // allow testing #ifdef LED_BUILTIN
// RGB_BUILTIN and RGB_BRIGHTNESS can be used in new Arduino API neopixelWrite()
#define RGB_BUILTIN LED_BUILTIN
#define RGB_BRIGHTNESS 64
static const uint8_t TX = 21;
static const uint8_t RX = 20;
static const uint8_t SDA = 8;
static const uint8_t SCL = 9;
static const uint8_t SS = 4;
static const uint8_t MOSI = 6;
static const uint8_t MISO = 7;
static const uint8_t SCK = 5;
static const uint8_t A0 = 0;
static const uint8_t A1 = 1;
static const uint8_t A2 = 2;
static const uint8_t A3 = 3;
static const uint8_t A4 = 4;
static const uint8_t A5 = 5;
#endif /* Pins_Arduino_h */