Hello.
I'm using an esp32 (esp32 pico-mini-02, to be exact). When I try to use the SPI it results in Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled. Using the esp32exceptiondecoder, I was some what able to narrow down the problem but am unable to solve it.
If anyone has any idea what is going on, please share you thoughts.
Thank you.
The full error message
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 271414342, 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:1044
load:0x40078000,len:10124
load:0x40080400,len:5856
entry 0x400806a8
Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC : 0x40080f31 PS : 0x00060730 A0 : 0x800d0f3d A1 : 0x3ffb1f30
A2 : 0x0000000e A3 : 0x00000002 A4 : 0x3ffb8364 A5 : 0x00000001
A6 : 0x00000000 A7 : 0x00000004 A8 : 0x3f400674 A9 : 0xaaaaaaaa
A10 : 0xaaaaaaaa A11 : 0x00000030 A12 : 0x3ffb82cc A13 : 0x00000000
A14 : 0x00000000 A15 : 0x00000000 SAR : 0x00000009 EXCCAUSE: 0x0000001c
EXCVADDR: 0xaaaaaaaa LBEG : 0x400d1258 LEND : 0x400d1265 LCOUNT : 0x00000000
ELF file SHA256: 0000000000000000
Backtrace: 0x40080f31:0x3ffb1f30 0x400d0f3a:0x3ffb1f50 0x400d0db2:0x3ffb1f70 0x400d0c2b:0x3ffb1f90 0x400d190a:0x3ffb1fb0 0x40085fa5:0x3ffb1fd0
Rebooting...
ets Jul 29 2019 12:21:46
The decoded backtrace
0x40080f31: __pinMode at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\cores\esp32\esp32-hal-gpio.c line 115
0x400d0f3a: spiAttachSCK at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\cores\esp32\esp32-hal-spi.c line 87
0x400d0db2: SPIClass::begin(signed char, signed char, signed char, signed char) at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\libraries\SPI\src\SPI.cpp line 57
0x400d0c2b: setup() at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\libraries\SPI\examples\SPI_Multiple_Buses/SPI_Multiple_Buses.ino line 67
0x400d190a: loopTask(void*) at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\cores\esp32\main.cpp line 32
0x40085fa5: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143
The example sketch
/* The ESP32 has four SPi buses, however as of right now only two of
* them are available to use, HSPI and VSPI. Simply using the SPI API
* as illustrated in Arduino examples will use VSPI, leaving HSPI unused.
*
* However if we simply intialise two instance of the SPI class for both
* of these buses both can be used. However when just using these the Arduino
* way only will actually be outputting at a time.
*
* Logic analyser capture is in the same folder as this example as
* "multiple_bus_output.png"
*
* created 30/04/2018 by Alistair Symonds
*/
#include <SPI.h>
// Define ALTERNATE_PINS to use non-standard GPIO pins for SPI bus
#ifdef ALTERNATE_PINS
#define VSPI_MISO 2
#define VSPI_MOSI 4
#define VSPI_SCLK 0
#define VSPI_SS 33
#define HSPI_MISO 26
#define HSPI_MOSI 27
#define HSPI_SCLK 25
#define HSPI_SS 32
#else
#define VSPI_MISO MISO
#define VSPI_MOSI MOSI
#define VSPI_SCLK SCK
#define VSPI_SS SS
#define HSPI_MISO 12
#define HSPI_MOSI 13
#define HSPI_SCLK 14
#define HSPI_SS 15
#endif
#if CONFIG_IDF_TARGET_ESP32S2
#define VSPI FSPI
#endif
static const int spiClk = 1000000; // 1 MHz
//uninitalised pointers to SPI objects
SPIClass * vspi = NULL;
SPIClass * hspi = NULL;
void setup() {
//initialise two instances of the SPIClass attached to VSPI and HSPI respectively
vspi = new SPIClass(VSPI);
hspi = new SPIClass(HSPI);
//clock miso mosi ss
#ifndef ALTERNATE_PINS
//initialise vspi with default pins
//SCLK = 18, MISO = 19, MOSI = 23, SS = 5
vspi->begin();
#else
//alternatively route through GPIO pins of your choice
vspi->begin(VSPI_SCLK, VSPI_MISO, VSPI_MOSI, VSPI_SS); //SCLK, MISO, MOSI, SS
#endif
#ifndef ALTERNATE_PINS
//initialise hspi with default pins
//SCLK = 14, MISO = 12, MOSI = 13, SS = 15
hspi->begin();
#else
//alternatively route through GPIO pins
hspi->begin(HSPI_SCLK, HSPI_MISO, HSPI_MOSI, HSPI_SS); //SCLK, MISO, MOSI, SS
#endif
//set up slave select pins as outputs as the Arduino API
//doesn't handle automatically pulling SS low
pinMode(VSPI_SS, OUTPUT); //VSPI SS
pinMode(HSPI_SS, OUTPUT); //HSPI SS
}
// the loop function runs over and over again until power down or reset
void loop() {
//use the SPI buses
vspiCommand();
hspiCommand();
delay(100);
}
void vspiCommand() {
byte data = 0b01010101; // junk data to illustrate usage
//use it as you would the regular arduino SPI API
vspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
digitalWrite(VSPI_SS, LOW); //pull SS slow to prep other end for transfer
vspi->transfer(data);
digitalWrite(VSPI_SS, HIGH); //pull ss high to signify end of data transfer
vspi->endTransaction();
}
void hspiCommand() {
byte stuff = 0b11001100;
hspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
digitalWrite(HSPI_SS, LOW);
hspi->transfer(stuff);
digitalWrite(HSPI_SS, HIGH);
hspi->endTransaction();
}
I've tried various combination of pins, nothing seems to work.