Teensy 4.0 and w25Q64 Breakout Board

[Harveyn4444]

Description

Describe your problem.
I have a breakout board containing a W25Q64 flash chip and have tried to run the raw hardware test.

Steps To Reproduce Problem

Please give detailed instructions needed for anyone to attempt to reproduce the problem.
I have the breakout board (https://www.ebay.co.uk/itm/Flash-Storage-Module-W25Q64-64M-bit-SPI-Interface-For-1-PACK/323636815798) found here, with the Do and Di pins set to MISO and MOSO respectively and the example codes cannot read the chip, with the CS pin at 4.

Hardware & Software

Teensy 4.0
(https://www.ebay.co.uk/itm/Flash-Storage-Module-W25Q64-64M-bit-SPI-Interface-For-1-PACK/323636815798) No idea. of the actual name
Arduino IDE 1.8.13
Teensyduino version 1.53
Version info & package name (from Tools > Boards > Board Manager)
macOS Big Sur version 11.1

Arduino Sketch

//This is the example code
#include <SerialFlash.h>
#include <SPI.h>

const int FlashChipSelect = 4; // digital pin for flash chip CS pin
//const int FlashChipSelect = 21; // Arduino 101 built-in SPI Flash

SerialFlashFile file;

const unsigned long testIncrement = 4096;

void setup() {

//uncomment these if using Teensy audio shield
//SPI.setSCK(14); // Audio shield has SCK on pin 14
//SPI.setMOSI(7); // Audio shield has MOSI on pin 7

//uncomment these if you have other SPI chips connected
//to keep them disabled while using only SerialFlash
//pinMode(4, INPUT_PULLUP);
//pinMode(10, INPUT_PULLUP);

Serial.begin(9600);

while (!Serial) ;
delay(100);

Serial.println("Raw SerialFlash Hardware Test");
SerialFlash.begin(FlashChipSelect); // proceed even if begin() fails

if (test()) {
Serial.println();
Serial.println("All Tests Passed :-)");
Serial.println();
Serial.println("Test data was written to your chip. You must run");
Serial.println("EraseEverything before using this chip for files.");
} else {
Serial.println();
Serial.println("Tests Failed :{");
Serial.println();
Serial.println("The flash chip may be left in an improper state.");
Serial.println("You might need to power cycle to return to normal.");
}
}

bool test() {
unsigned char buf[256], sig[256], buf2[8];
unsigned long address, count, chipsize, blocksize;
unsigned long usec;
bool first;

// Read the chip identification
Serial.println();
Serial.println("Read Chip Identification:");
SerialFlash.readID(buf);
Serial.print(" JEDEC ID: ");
Serial.print(buf[0], HEX);
Serial.print(" ");
Serial.print(buf[1], HEX);
Serial.print(" ");
Serial.println(buf[2], HEX);
Serial.print(" Part Nummber: ");
Serial.println(id2chip(buf));
Serial.print(" Memory Size: ");
chipsize = SerialFlash.capacity(buf);
Serial.print(chipsize);
Serial.println(" bytes");
if (chipsize == 0) return false;
Serial.print(" Block Size: ");
blocksize = SerialFlash.blockSize();
Serial.print(blocksize);
Serial.println(" bytes");

// Read the entire chip. Every test location must be
// erased, or have a previously tested signature
Serial.println();
Serial.println("Reading Chip...");
memset(buf, 0, sizeof(buf));
memset(sig, 0, sizeof(sig));
memset(buf2, 0, sizeof(buf2));
address = 0;
count = 0;
first = true;
while (address < chipsize) {
SerialFlash.read(address, buf, 8);
//Serial.print(" addr = ");
//Serial.print(address, HEX);
//Serial.print(", data = ");
//printbuf(buf, 8);
create_signature(address, sig);
if (is_erased(buf, 8) == false) {
if (equal_signatures(buf, sig) == false) {
Serial.print(" Previous data found at address ");
Serial.println(address);
Serial.println(" You must fully erase the chip before this test");
Serial.print(" found this: ");
printbuf(buf, 8);
Serial.print(" correct: ");
printbuf(sig, 8);
return false;
}
} else {
count = count + 1; // number of blank signatures
}
if (first) {
address = address + (testIncrement - 8);
first = false;
} else {
address = address + 8;
first = true;
}
}

// Write any signatures that were blank on the original check
if (count > 0) {
Serial.println();
Serial.print("Writing ");
Serial.print(count);
Serial.println(" signatures");
memset(buf, 0, sizeof(buf));
memset(sig, 0, sizeof(sig));
memset(buf2, 0, sizeof(buf2));
address = 0;
first = true;
while (address < chipsize) {
SerialFlash.read(address, buf, 8);
if (is_erased(buf, 8)) {
create_signature(address, sig);
//Serial.printf("write %08X: data: ", address);
//printbuf(sig, 8);
SerialFlash.write(address, sig, 8);
while (!SerialFlash.ready()) ; // wait
SerialFlash.read(address, buf, 8);
if (equal_signatures(buf, sig) == false) {
Serial.print(" error writing signature at ");
Serial.println(address);
Serial.print(" Read this: ");
printbuf(buf, 8);
Serial.print(" Expected: ");
printbuf(sig, 8);
return false;
}
}
if (first) {
address = address + (testIncrement - 8);
first = false;
} else {
address = address + 8;
first = true;
}
}
} else {
Serial.println(" all signatures present from prior tests");
}

// Read all the signatures again, just to be sure
// checks prior writing didn't corrupt any other data
Serial.println();
Serial.println("Double Checking All Signatures:");
memset(buf, 0, sizeof(buf));
memset(sig, 0, sizeof(sig));
memset(buf2, 0, sizeof(buf2));
count = 0;
address = 0;
first = true;
while (address < chipsize) {
SerialFlash.read(address, buf, 8);
create_signature(address, sig);
if (equal_signatures(buf, sig) == false) {
Serial.print(" error in signature at ");
Serial.println(address);
Serial.print(" Read this: ");
printbuf(buf, 8);
Serial.print(" Expected: ");
printbuf(sig, 8);
return false;
}
count = count + 1;
if (first) {
address = address + (testIncrement - 8);
first = false;
} else {
address = address + 8;
first = true;
}
}
Serial.print(" all ");
Serial.print(count);
Serial.println(" signatures read ok");

// Read pairs of adjacent signatures
// check read works across boundaries
Serial.println();
Serial.println("Checking Signature Pairs");
memset(buf, 0, sizeof(buf));
memset(sig, 0, sizeof(sig));
memset(buf2, 0, sizeof(buf2));
count = 0;
address = testIncrement - 8;
first = true;
while (address < chipsize - 8) {
SerialFlash.read(address, buf, 16);
create_signature(address, sig);
create_signature(address + 8, sig + 8);
if (memcmp(buf, sig, 16) != 0) {
Serial.print(" error in signature pair at ");
Serial.println(address);
Serial.print(" Read this: ");
printbuf(buf, 16);
Serial.print(" Expected: ");
printbuf(sig, 16);
return false;
}
count = count + 1;
address = address + testIncrement;
}
Serial.print(" all ");
Serial.print(count);
Serial.println(" signature pairs read ok");

// Write data and read while write in progress
Serial.println();
Serial.println("Checking Read-While-Write (Program Suspend)");
address = 256;
while (address < chipsize) { // find a blank space
SerialFlash.read(address, buf, 256);
if (is_erased(buf, 256)) break;
address = address + 256;
}
if (address >= chipsize) {
Serial.println(" error, unable to find any blank space!");
return false;
}
for (int i=0; i < 256; i += 8) {
create_signature(address + i, sig + i);
}
Serial.print(" write 256 bytes at ");
Serial.println(address);
Serial.flush();
SerialFlash.write(address, sig, 256);
usec = micros();
if (SerialFlash.ready()) {
Serial.println(" error, chip did not become busy after write");
return false;
}
SerialFlash.read(0, buf2, 8); // read while busy writing
while (!SerialFlash.ready()) ; // wait
usec = micros() - usec;
Serial.print(" write time was ");
Serial.print(usec);
Serial.println(" microseconds.");
SerialFlash.read(address, buf, 256);
if (memcmp(buf, sig, 256) != 0) {
Serial.println(" error writing to flash");
Serial.print(" Read this: ");
printbuf(buf, 256);
Serial.print(" Expected: ");
printbuf(sig, 256);
return false;
}
create_signature(0, sig);
if (memcmp(buf2, sig, 8) != 0) {
Serial.println(" error, incorrect read while writing");
Serial.print(" Read this: ");
printbuf(buf2, 256);
Serial.print(" Expected: ");
printbuf(sig, 256);
return false;
}
Serial.print(" read-while-writing: ");
printbuf(buf2, 8);
Serial.println(" test passed, good read while writing");

// Erase a block and read while erase in progress
if (chipsize >= 262144 + blocksize + testIncrement) {
Serial.println();
Serial.println("Checking Read-While-Erase (Erase Suspend)");
memset(buf, 0, sizeof(buf));
memset(sig, 0, sizeof(sig));
memset(buf2, 0, sizeof(buf2));
SerialFlash.eraseBlock(262144);
usec = micros();
delayMicroseconds(50);
if (SerialFlash.ready()) {
Serial.println(" error, chip did not become busy after erase");
return false;
}
SerialFlash.read(0, buf2, 8); // read while busy writing
while (!SerialFlash.ready()) ; // wait
usec = micros() - usec;
Serial.print(" erase time was ");
Serial.print(usec);
Serial.println(" microseconds.");
// read all signatures, check ones in this block got
// erased, and all the others are still intact
address = 0;
first = true;
while (address < chipsize) {
SerialFlash.read(address, buf, 8);
if (address >= 262144 && address < 262144 + blocksize) {
if (is_erased(buf, 8) == false) {
Serial.print(" error in erasing at ");
Serial.println(address);
Serial.print(" Read this: ");
printbuf(buf, 8);
return false;
}
} else {
create_signature(address, sig);
if (equal_signatures(buf, sig) == false) {
Serial.print(" error in signature at ");
Serial.println(address);
Serial.print(" Read this: ");
printbuf(buf, 8);
Serial.print(" Expected: ");
printbuf(sig, 8);
return false;
}
}
if (first) {
address = address + (testIncrement - 8);
first = false;
} else {
address = address + 8;
first = true;
}
}
Serial.print(" erase correctly erased ");
Serial.print(blocksize);
Serial.println(" bytes");
// now check if the data we read during erase is good
create_signature(0, sig);
if (memcmp(buf2, sig, 8) != 0) {
Serial.println(" error, incorrect read while erasing");
Serial.print(" Read this: ");
printbuf(buf2, 256);
Serial.print(" Expected: ");
printbuf(sig, 256);
return false;
}
Serial.print(" read-while-erasing: ");
printbuf(buf2, 8);
Serial.println(" test passed, good read while erasing");

} else {
Serial.println("Skip Read-While-Erase, this chip is too small");
}

return true;
}

void loop() {
// do nothing after the test
}

const char * id2chip(const unsigned char *id)
{
if (id[0] == 0xEF) {
// Winbond
if (id[1] == 0x40) {
if (id[2] == 0x14) return "W25Q80BV";
if (id[2] == 0x15) return "W25Q16DV";
if (id[2] == 0x17) return "W25Q64FV";
if (id[2] == 0x18) return "W25Q128FV";
if (id[2] == 0x19) return "W25Q256FV";
}
}
if (id[0] == 0x01) {
// Spansion
if (id[1] == 0x02) {
if (id[2] == 0x16) return "S25FL064A";
if (id[2] == 0x19) return "S25FL256S";
if (id[2] == 0x20) return "S25FL512S";
}
if (id[1] == 0x20) {
if (id[2] == 0x18) return "S25FL127S";
}
}
if (id[0] == 0xC2) {
// Macronix
if (id[1] == 0x20) {
if (id[2] == 0x18) return "MX25L12805D";
}
}
if (id[0] == 0x20) {
// Micron
if (id[1] == 0xBA) {
if (id[2] == 0x20) return "N25Q512A";
if (id[2] == 0x21) return "N25Q00AA";
}
if (id[1] == 0xBB) {
if (id[2] == 0x22) return "MT25QL02GC";
}
}
if (id[0] == 0xBF) {
// SST
if (id[1] == 0x25) {
if (id[2] == 0x02) return "SST25WF010";
if (id[2] == 0x03) return "SST25WF020";
if (id[2] == 0x04) return "SST25WF040";
if (id[2] == 0x41) return "SST25VF016B";
if (id[2] == 0x4A) return "SST25VF032";
}
if (id[1] == 0x25) {
if (id[2] == 0x01) return "SST26VF016";
if (id[2] == 0x02) return "SST26VF032";
if (id[2] == 0x43) return "SST26VF064";
}
}
if (id[0] == 0x1F) {
// Adesto
if (id[1] == 0x89) {
if (id[2] == 0x01) return "AT25SF128A";
}
}
return "(unknown chip)";
}

void print_signature(const unsigned char *data)
{
Serial.print("data=");
for (unsigned char i=0; i < 8; i++) {
Serial.print(data[i]);
Serial.print(" ");
}
Serial.println();
}

void create_signature(unsigned long address, unsigned char *data)
{
data[0] = address >> 24;
data[1] = address >> 16;
data[2] = address >> 8;
data[3] = address;
unsigned long hash = 2166136261ul;
for (unsigned char i=0; i < 4; i++) {
hash ^= data[i];
hash *= 16777619ul;
}
data[4] = hash;
data[5] = hash >> 8;
data[6] = hash >> 16;
data[7] = hash >> 24;
}

bool equal_signatures(const unsigned char *data1, const unsigned char *data2)
{
for (unsigned char i=0; i < 8; i++) {
if (data1[i] != data2[i]) return false;
}
return true;
}

bool is_erased(const unsigned char *data, unsigned int len)
{
while (len > 0) {
if (*data++ != 255) return false;
len = len - 1;
}
return true;
}

void printbuf(const void *buf, uint32_t len)
{
const uint8_t *p = (const uint8_t *)buf;
do {
unsigned char b = *p++;
Serial.print(b >> 4, HEX);
Serial.print(b & 15, HEX);
//Serial.printf("%02X", *p++);
Serial.print(" ");
} while (--len > 0);
Serial.println();
}

Thank you

Picture included
Red - Vcc (3.3V)
Yellow - CS (4)
Green - DO MISO Pin(12)
Brown - GND
Purple - SCK Pin(13)
Blue - DI MOSI Pin(11)

[Harveyn4444]

After re uploading the example sketch the program can now read the chip, just after I posted this :), but over the last few days it would not read the chip, ID the chip and not read it but now can read the chip and passes the test, I wired the chip up the exact same every time and just manages to work after I posted the issue.

[Harveyn4444]

I've just unplugged a rewired everything again and get this message
<Raw SerialFlash Hardware Test

Read Chip Identification:
JEDEC ID: FF FF FF
Part Nummber: (unknown chip)
Memory Size: 0 bytes

Tests Failed :{

The flash chip may be left in an improper state.
You might need to power cycle to return to normal.>

[Harveyn4444]

Also when I try the erase all example it freezes my serial port and outputs nothing, if I unplug the teensy the text is immediately written to the serial output
Again the chip seemed to be able to be read by my Teensy LC button. my Teensy 4.0 as I've just been trying again, no idea what could be causing the issue

[Harveyn4444]

It seems to work perfectly with the Teensy LC, just seems to be having issues with The Teensy 4.0

[MatePlaque]

can someone help with this situation were i am getting this when i try to run the above code to the flash chip its just saying
Previous data found at address 0
You must fully erase the chip before this test
found this: 00 00 00 00 0A FA CA 25
correct: 00 00 00 00 15 F5 95 4B

Tests Failed :{

The flash chip may be left in an improper state.
You might need to power cycle to return to normal.

[PaulStoffregen]

Try shorter wires. SPI is very fast, especially on Teensy 4.0. Long wires can cause problems with very fast signals.