Description
Hardware:
Board: ESP32-PICO-KIT Dev. Board
Core Installation/update date: 1 Aug 2018
IDE name: Arduino 1.8.5
Flash Frequency: 80MHz
Upload Speed: 921600
Description:
Blue tooth serial (Bluedroid) has memory leak. The sketch below is modified from serial to serial BT example.
The modification is as follows:
- set up timer for 1 sec timeout
- every sec turn on or off the bloe tooth serial.
- every time BTSerial is turned on or off print heap size
- observe that the heap size keeps diminishing, and eventually the core crashes.
Sketch: Modified serial to serial blue tooth example as follows:
//This example code is in the Public Domain (or CC0 licensed, at your option.)
//By Evandro Copercini - 2018
//
//This example creates a bridge between Serial and Classical Bluetooth (SPP)
//and also demonstrate that SerialBT have the same functionalities of a normal Serial
#include "BluetoothSerial.h"
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif
BluetoothSerial SerialBT;
volatile int switch_off_Bluetooth = 0;
// Timer set up
hw_timer_t * timer = NULL;
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;
#define PRESCALER 50000
#define NUM_TO_COUNT_UP_TO_1_SEC 1600
#define COUNT_OF_SECS 1
#define TIME_OUT COUNT_OF_SECS*NUM_TO_COUNT_UP_TO_1_SEC
volatile int timeout_occured=0;
void IRAM_ATTR onTimer() {
portENTER_CRITICAL_ISR(&timerMux);
timeout_occured = 1;
portEXIT_CRITICAL_ISR(&timerMux);
}
void setup_timer() {
timer = timerBegin(0, PRESCALER, true);
timerAttachInterrupt(timer, &onTimer, true);
timerAlarmWrite(timer, TIME_OUT, true);
timerAlarmEnable(timer);
}
void reset_timeout() {
portENTER_CRITICAL(&timerMux);
timeout_occured = 0;
portEXIT_CRITICAL(&timerMux);
}
void setup() {
Serial.begin(115200);
SerialBT.begin("ESP32test"); //Bluetooth device name
Serial.println("The device started, now you can pair it with bluetooth!");
setup_timer();
Serial.printf("Timer for a count of %d seconds of BTserial ON/OFF started",COUNT_OF_SECS);
Serial.println(" --> ");
}
void loop() {
if(timeout_occured) { // Turn on or off blue tooth based on timer time-out of COUNT_OF_SECS
reset_timeout(); // first reset time out flag
if (switch_off_Bluetooth) { // check if the BT serial needs to be turned off
switch_off_Bluetooth = 0;
SerialBT.flush();
SerialBT.end();
Serial.print("@ ");
Serial.print(millis()/1000);
Serial.printf(" secs > BTserial OFF Heap Size: %d ",ESP.getFreeHeap());
Serial.println(" ");
} else { // else switch on Bluetooth serial
switch_off_Bluetooth = 1;
SerialBT.begin("ESP32test"); //Bluetooth device name
Serial.print("@ ");
Serial.print(millis()/1000);
Serial.printf(" secs > BTserial ON Heap Size: %d ",ESP.getFreeHeap());
Serial.println(" ");
}
}
}Debug Messages:
The device started, now you can pair it with bluetooth!
Timer for a count of 1 seconds of BTserial ON/OFF started -->
@ 1 secs > BTserial ON Heap Size: 100308
@ 2 secs > BTserial OFF Heap Size: 169984
@ 3 secs > BTserial ON Heap Size: 95212
@ 4 secs > BTserial OFF Heap Size: 165340
@ 5 secs > BTserial ON Heap Size: 90616
@ 6 secs > BTserial OFF Heap Size: 160696
@ 7 secs > BTserial ON Heap Size: 86028
@ 8 secs > BTserial OFF Heap Size: 156060
@ 9 secs > BTserial ON Heap Size: 81340
@ 10 secs > BTserial OFF Heap Size: 152332
@ 11 secs > BTserial ON Heap Size: 77612
@ 12 secs > BTserial OFF Heap Size: 148608
@ 13 secs > BTserial ON Heap Size: 73912
@ 14 secs > BTserial OFF Heap Size: 144884
@ 15 secs > BTserial ON Heap Size: 70180
@ 16 secs > BTserial OFF Heap Size: 141160
@ 17 secs > BTserial ON Heap Size: 66508
@ 18 secs > BTserial OFF Heap Size: 137436
@ 19 secs > BTserial ON Heap Size: 62740
@ 20 secs > BTserial OFF Heap Size: 133708
@ 21 secs > BTserial ON Heap Size: 59036
@ 22 secs > BTserial OFF Heap Size: 129984
@ 23 secs > BTserial ON Heap Size: 55296
@ 24 secs > BTserial OFF Heap Size: 126264
@ 25 secs > BTserial ON Heap Size: 51552
@ 26 secs > BTserial OFF Heap Size: 122536
@ 27 secs > BTserial ON Heap Size: 47884
@ 28 secs > BTserial OFF Heap Size: 118816
@ 29 secs > BTserial ON Heap Size: 44172
@ 30 secs > BTserial OFF Heap Size: 115092
@ 31 secs > BTserial ON Heap Size: 40404
@ 32 secs > BTserial OFF Heap Size: 111368
@ 33 secs > BTserial ON Heap Size: 36664
@ 34 secs > BTserial OFF Heap Size: 107644
@ 35 secs > BTserial ON Heap Size: 32948
@ 36 secs > BTserial OFF Heap Size: 103920
@ 37 secs > BTserial ON Heap Size: 29224
@ 38 secs > BTserial OFF Heap Size: 100196
@ 39 secs > BTserial ON Heap Size: 25504
@ 40 secs > BTserial OFF Heap Size: 96472
@ 41 secs > BTserial ON Heap Size: 21804
@ 42 secs > BTserial OFF Heap Size: 92748
@ 43 secs > BTserial ON Heap Size: 18076
@ 44 secs > BTserial OFF Heap Size: 89024
@ 45 secs > BTserial ON Heap Size: 14384
@ 46 secs > BTserial OFF Heap Size: 85300
@ 47 secs > BTserial ON Heap Size: 10696
@ 48 secs > BTserial OFF Heap Size: 81576
@ 49 secs > BTserial ON Heap Size: 6928
@ 50 secs > BTserial OFF Heap Size: 77852
@ 53 secs > BTserial ON Heap Size: 3112
@ 53 secs > BTserial OFF Heap Size: 74132
Guru Meditation Error: Core 0 panic'ed (StoreProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x4000c46c PS : 0x00060e30 A0 : 0x801139de A1 : 0x3ffdaf90
A2 : 0x00000000 A3 : 0x00000000 A4 : 0x0000001c A5 : 0x00000000
A6 : 0x40179f3c A7 : 0x00000001 A8 : 0x800d70bd A9 : 0x3ffdaf50
A10 : 0x3ffe8ca8 A11 : 0x00000000 A12 : 0x00000001 A13 : 0x3ffe7370
A14 : 0x3ffe15f4 A15 : 0x00000084 SAR : 0x00000008 EXCCAUSE: 0x0000001d
EXCVADDR: 0x00000000 LBEG : 0x4000c46c LEND : 0x4000c477 LCOUNT : 0x00000000
Backtrace: 0x4000c46c:0x3ffdaf90 0x401139db:0x3ffdafa0 0x401142b1:0x3ffdafc0
0x400ef8f5:0x3ffdafe0 0x400ef92f:0x3ffdb000
Rebooting...
ets Jun 8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 188777542, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:808
load:0x40078000,len:6084
load:0x40080000,len:6696
entry 0x400802e4