ESP_I2S.h: error: 'int read' redeclared as different kind of entity

[kowyo]

Board

XIAOESP32S3

Device Description

Hardware Configuration

USB connected to Mac

Version

v3.0.1

IDE Name

Arduino IDE

Operating System

macOS 14.5

Flash frequency

80Mhz

PSRAM enabled

yes

Upload speed

115200

Description

@lucasssvaz @me-no-dev I ran the example code in https://docs.espressif.com/projects/arduino-esp32/en/latest/api/i2s.html?highlight=i2s and the output reported error

Sketch

#include <ESP_I2S.h>

const int buff_size = 128;
int available, read;
uint8_t buffer[buff_size];
I2SClass I2S;

void setup() {
  I2S.setPins(5, 25, 26, 35, 0); //SCK, WS, SDOUT, SDIN, MCLK
  I2S.begin(I2S_MODE_STD, 16000, I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_STEREO);
  I2S.read();
  available = I2S.available();
  if(available < buff_size) {
    read = I2S.read(buffer, available);
  } else {
    read = I2S.read(buffer, buff_size);
  }
  I2S.write(buffer, read);
  I2S.end();
}

void loop() {}

Debug Message

/Users/kowyo/Library/CloudStorage/OneDrive-Personal/Projects/OpenGlass/firmware/firmware.ino:4:16: error: 'int read' redeclared as different kind of entity
    4 | int available, read;
      |                ^~~~
In file included from /Users/kowyo/Library/Arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-442a798083/esp32s3/include/newlib/platform_include/sys/unistd.h:11,
                 from /Users/kowyo/Library/Arduino15/packages/esp32/tools/esp-xs3/2302/xtensa-esp32s3-elf/sys-include/unistd.h:4,
                 from /Users/kowyo/Library/Arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-442a798083/esp32s3/include/lwip/port/include/lwipopts.h:14,
                 from /Users/kowyo/Library/Arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-442a798083/esp32s3/include/lwip/lwip/src/include/lwip/opt.h:51,
                 from /Users/kowyo/Library/Arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-442a798083/esp32s3/include/lwip/lwip/src/include/lwip/ip_addr.h:40,
                 from /Users/kowyo/Library/Arduino15/packages/esp32/hardware/esp32/3.0.1/cores/esp32/IPAddress.h:25,
                 from /Users/kowyo/Library/Arduino15/packages/esp32/hardware/esp32/3.0.1/cores/esp32/Arduino.h:196,
                 from /private/var/folders/6r/s6_mxzqs2nq3vp6jb2hh8xpr0000gn/T/arduino/sketches/A17C809F49E99F211DA5F2057498F7E6/sketch/firmware.ino.cpp:1:
/Users/kowyo/Library/Arduino15/packages/esp32/tools/esp-xs3/2302/xtensa-esp32s3-elf/sys-include/sys/unistd.h:189:25: note: previous declaration 'int read(int, void*, size_t)'
  189 | _READ_WRITE_RETURN_TYPE read (int __fd, void *__buf, size_t __nbyte);
      |                         ^~~~
/Users/kowyo/Library/CloudStorage/OneDrive-Personal/Projects/OpenGlass/firmware/firmware.ino: In function 'void setup()':
/Users/kowyo/Library/CloudStorage/OneDrive-Personal/Projects/OpenGlass/firmware/firmware.ino:14:20: error: no matching function for call to 'I2SClass::read(uint8_t [128], int&)'
   14 |     read = I2S.read(buffer, available);
      |            ~~~~~~~~^~~~~~~~~~~~~~~~~~~
In file included from /Users/kowyo/Library/CloudStorage/OneDrive-Personal/Projects/OpenGlass/firmware/firmware.ino:1:
/Users/kowyo/Library/Arduino15/packages/esp32/hardware/esp32/3.0.1/libraries/ESP_I2S/src/ESP_I2S.h:81:7: note: candidate: 'virtual int I2SClass::read()'
   81 |   int read();
      |       ^~~~
/Users/kowyo/Library/Arduino15/packages/esp32/hardware/esp32/3.0.1/libraries/ESP_I2S/src/ESP_I2S.h:81:7: note:   candidate expects 0 arguments, 2 provided
/Users/kowyo/Library/CloudStorage/OneDrive-Personal/Projects/OpenGlass/firmware/firmware.ino:16:20: error: no matching function for call to 'I2SClass::read(uint8_t [128], const int&)'
   16 |     read = I2S.read(buffer, buff_size);
      |            ~~~~~~~~^~~~~~~~~~~~~~~~~~~
/Users/kowyo/Library/Arduino15/packages/esp32/hardware/esp32/3.0.1/libraries/ESP_I2S/src/ESP_I2S.h:81:7: note: candidate: 'virtual int I2SClass::read()'
   81 |   int read();
      |       ^~~~
/Users/kowyo/Library/Arduino15/packages/esp32/hardware/esp32/3.0.1/libraries/ESP_I2S/src/ESP_I2S.h:81:7: note:   candidate expects 0 arguments, 2 provided
/Users/kowyo/Library/CloudStorage/OneDrive-Personal/Projects/OpenGlass/firmware/firmware.ino:18:21: error: invalid conversion from 'int (*)(int, void*, size_t)' {aka 'int (*)(int, void*, unsigned int)'} to 'size_t' {aka 'unsigned int'} [-fpermissive]
   18 |   I2S.write(buffer, read);
      |                     ^~~~
      |                     |
      |                     int (*)(int, void*, size_t) {aka int (*)(int, void*, unsigned int)}
/Users/kowyo/Library/Arduino15/packages/esp32/hardware/esp32/3.0.1/libraries/ESP_I2S/src/ESP_I2S.h:65:40: note:   initializing argument 2 of 'size_t I2SClass::write(uint8_t*, size_t)'
   65 |   size_t write(uint8_t *buffer, size_t size);
      |                                 ~~~~~~~^~~~

exit status 1

Compilation error: 'int read' redeclared as different kind of entity

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[lucasssvaz]

I'll update the example but for now you can just rename the read variable to byte_read and available to bytes_available and it should work fine