Board

Waveshare ESP32-S3 zero

Device Description

Plain board only.

Hardware Configuration

Plain board only.

Version

github.com/espressif/arduino-esp32 as at 31May25

IDE Name

Adruino IDE v1.8.19

Operating System

Windows 10

Flash frequency

80MHz

PSRAM enabled

no

Upload speed

921600

Description

The following sketch/calculation gives a big (int32_t) number when it should give a small negative (int32_t) number.

A similar error occurs if doing a (uint32_t) divided by an (int32_t).

This error can be got around by limiting the (uint32_t) number to 0x7FFFFFFF and then casting it to an (int32_t).

However, I think it would be preferable if this was not necessary!?!

Sketch

void setup() {
  Serial.begin(115200);
  delay(3000);
  int32_t  x=-2000;
  uint32_t y= 1000;
  int32_t  z=x/y; // an (int32_t) divided by a (uint32_t)
  Serial.printf("Error: x=%li, y=%lu, x/y=z=%li\n",x,y,z); // Error: x=-2000, y=1000, x/y=z=4294965
  x=abs(x); z=x/y;
  Serial.printf("But:   x=%li, y=%lu, x/y=z=%li\n",x,y,z); // But:   x=2000, y=1000, x/y=z=2
}

void loop() {}

Debug Message

Error: x=-2000, y=1000, x/y=z=4294965
But:   x=2000, y=1000, x/y=z=2

Other Steps to Reproduce

None

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

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