I am working with "ch376 usb module" and making it to communicate with my arduino mega 2560 using spi protocol. It gives me communication error at the start. I have figured out that it has something to do with my wiring.
I followed this link and also studied the datasheet. But I am unable to configure what is wrong with my wiring. In the start, when I ping my device, it gives me communication error. It works completely fine using hardware serial but fails to communicate using spi. I followed the exact wiring in the link mentioned above but no luck!
Can anyone please help me what am I doing wrong? Any guidance would be much appreciated.
#include <Ch376msc.h>
// use this if no other device are attached to SPI port(MISO pin used as interrupt)
Ch376msc flashDrive(53); // chipSelect
//If the SPI port shared with other devices e.g SD card, display, etc. remove from comment the code below and put the code above in a comment
//Ch376msc flashDrive(10, 9); // chipSelect, interrupt pin
//..............................................................................................................................
// buffer for reading
char adatBuffer[255];// max length 255 = 254 char + 1 NULL character
//..............................................................................................................................
// strings for writing to file
char adat[]="Vivamus nec nisl molestie, blandit diam vel, varius mi. Fusce luctus cursus sapien in vulputate.\n";
char adat2[] = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis efficitur ac est eu pharetra. \n";
//..............................................................................................................................
unsigned long totSect = 0;
unsigned long freeSect = 0;
byte percentg = 0;
byte tmpCommand; //used to store data coming from serial port
boolean readMore;
static char helpString[]= {"h:Print this help\n\n1:Create\n2:Append\n3:Read\n4:Read date/time\n"
"5:Modify date/time\n6:Delete\n7:List dir\n8:Print free space"
"\n9:Open/Create folder(s)/subfolder(s)"};
void setup() {
Serial.begin(115200);
flashDrive.init();
printInfo(helpString);
}
void loop() {
if(flashDrive.checkIntMessage()){
if(flashDrive.getDeviceStatus()){
Serial.println(F("Flash drive attached!"));
} else {
Serial.println(F("Flash drive detached!"));
}
}
if(Serial.available()){
tmpCommand = Serial.read(); //read incoming bytes from the serial monitor
if(((tmpCommand > 48)&&(tmpCommand < 58)) && !flashDrive.driveReady()){ // if the data is ASCII 1 - 9 and no flash drive are attached
printInfo("Attach flash drive first!");
tmpCommand = 10; // change the command byte
}
switch (tmpCommand) {
case 49: //1
printInfo("COMMAND1: Create and write data to file : TEST1.TXT"); // Create a file called TEST1.TXT
flashDrive.setFileName("TEST1.TXT"); //set the file name
flashDrive.openFile(); //open the file
for(int a = 0; a < 20; a++){ //write text from string(adat) to flash drive 20 times
flashDrive.writeFile(adat, strlen(adat)); //string, string length
}
flashDrive.closeFile(); //at the end, close the file
printInfo("Done!");
break;
//*****************************************************************************************************************************************************
case 50: //2
printInfo("COMMAND2: Append data to file: TEST1.TXT"); // Append data to the end of the file.
flashDrive.setFileName("TEST1.TXT"); //set the file name
if(flashDrive.openFile() == ANSW_USB_INT_SUCCESS){ //open the file
flashDrive.moveCursor(CURSOREND); //if the file exist, move the "virtual" cursor at end of the file, with CURSORBEGIN we actually rewrite our old file
//flashDrive.moveCursor(flashDrive.getFileSize()); // is almost the same as CURSOREND, because we put our cursor at end of the file
}
for(int a = 0; a < 20; a++){ //write text from string(adat) to flash drive 20 times
if(flashDrive.getFreeSectors()){ //check the free space on the drive
flashDrive.writeFile(adat2, strlen(adat2)); //string, string length
} else {
printInfo("Disk full");
}
}
flashDrive.closeFile(); //at the end, close the file
printInfo("Done!");
break;
//*****************************************************************************************************************************************************
case 51: //3
printInfo("COMMAND3: Read File: TEST1.TXT"); // Read the contents of this file on the USB disk, and display contents in the Serial Monitor
flashDrive.setFileName("TEST1.TXT"); //set the file name
flashDrive.openFile(); //open the file
readMore = true;
//read data from flash drive until we reach EOF
while(readMore){ // our temporary buffer where we read data from flash drive and the size of that buffer
readMore = flashDrive.readFile(adatBuffer, sizeof(adatBuffer));
Serial.print(adatBuffer); //print the contents of the temporary buffer
}
flashDrive.closeFile(); //at the end, close the file
printInfo("Done!");
break;
//*****************************************************************************************************************************************************
case 52: //4
printInfo("COMMAND4: Read File date/time: TEST1.TXT"); // Read the date and time of file, default 2004.01.01 - 00:00:00
flashDrive.setFileName("TEST1.TXT"); //set the file name
flashDrive.openFile(); //open the file
//print informations about the file
Serial.println(flashDrive.getFileName());
Serial.print(flashDrive.getYear());
Serial.print("y\t");
Serial.print(flashDrive.getMonth());
Serial.print("m\t");
Serial.print(flashDrive.getDay());
Serial.print("d\t");
Serial.print(flashDrive.getHour());
Serial.print("h\t");
Serial.print(flashDrive.getMinute());
Serial.print("m\t");
Serial.print(flashDrive.getSecond());
Serial.println('s');
flashDrive.closeFile(); //at the end, close the file
printInfo("Done!");
break;
//*****************************************************************************************************************************************************
case 53: //5
printInfo("COMMAND5: Modify File date/time: TEST1.TXT"); // Modify the file date/time and save
flashDrive.setFileName("TEST1.TXT"); //set the file name
flashDrive.openFile(); //open the file
flashDrive.setYear(2019);
flashDrive.setMonth(12);
flashDrive.setDay(19);
flashDrive.setHour(03);
flashDrive.setMinute(38);
flashDrive.setSecond(42);
flashDrive.saveFileAttrb(); //save the changed data
flashDrive.closeFile(); //and yes again, close the file after when you don`t use it
printInfo("Done!");
break;
//*****************************************************************************************************************************************************
case 54: //6
printInfo("COMMAND6: Delete File: TEST1.TXT"); // Delete the file named TEST1.TXT
flashDrive.setFileName("TEST1.TXT"); //set the file name
flashDrive.deleteFile(); //delete file
printInfo("Done!");
break;
//*****************************************************************************************************************************************************
case 55: //7
printInfo("COMMAND7: List directory"); //Print all file names in the current directory
while(flashDrive.listDir()){ // reading next file
if(flashDrive.getFileAttrb() == CH376_ATTR_DIRECTORY){//directory
Serial.print('/');
Serial.println(flashDrive.getFileName()); // get the actual file name
} else {
Serial.print(flashDrive.getFileName()); // get the actual file name
Serial.print(" : ");
Serial.print(flashDrive.getFileSize()); // get the actual file size in bytes
Serial.print(" >>>\t");
Serial.println(flashDrive.getFileSizeStr()); // get the actual file size in formatted string
}
}
printInfo("Done!");
break;
//*****************************************************************************************************************************************************
case 56: //8
totSect = flashDrive.getTotalSectors(); // get the total sector number
freeSect = flashDrive.getFreeSectors(); // get the available sector number
percentg = map(freeSect,totSect,0,0,100); // convert it to percentage (0-100)
Serial.print("Disk size in bytes: ");
/*if the sector number is more than 8388607 (8388607 * 512 = 4294966784 byte = 4Gb (fits in a 32bit variable) )
e.g. 8388608 * 512 = 4294967296 byte (32bit variable overflows) */
if(totSect > 8388607){
Serial.print(">4Gb");
} else {
Serial.print(totSect * SECTORSIZE);
}
Serial.print("\tFree space in bytes: ");
if(freeSect > 8388607){
Serial.print(">4Gb");
} else {
Serial.print(freeSect * SECTORSIZE);
}
Serial.print(F("\tDisk usage :"));
Serial.print(percentg);
Serial.print(F("%"));
switch (flashDrive.getFileSystem()) { //1-FAT12, 2-FAT16, 3-FAT32
case 1:
Serial.println(F("\tFAT12 partition"));
break;
case 2:
Serial.println(F("\tFAT16 partition"));
break;
case 3:
Serial.println(F("\tFAT32 partition"));
break;
default:
Serial.println(F("\tNo valid partition"));
break;
}
break;
//*****************************************************************************************************************************************************
case 57: //9
switch(flashDrive.cd("/DIR1/DIR2/DIR3",1)){
case CH376_ERR_LONGFILENAME: //0x01
Serial.println(F("Directory name is too long"));
break;
case ANSW_USB_INT_SUCCESS: //0x14
Serial.println(F("Directory created successfully"));
break;
case ANSW_ERR_OPEN_DIR: //0x41
Serial.println(F("Directory opened successfully"));
break;
case ANSW_ERR_MISS_FILE: //0x42
Serial.println(F("Directory doesn't exist"));
break;
case ANSW_ERR_FOUND_NAME: //0x43
Serial.println(F("File exist with the given name"));
break;
default:
break;
}
break;
//*****************************************************************************************************************************************************
case 104: //h
printInfo(helpString);
break;
default:
break;
}//end switch
}//endif serial available
}//end loop
//Print information
void printInfo(const char info[]){
int infoLength = strlen(info);
if(infoLength > 40){
infoLength = 40;
}
Serial.print(F("\n\n"));
for(int a = 0; a < infoLength; a++){
Serial.print('*');
}
Serial.println();
Serial.println(info);
for(int a = 0; a < infoLength; a++){
Serial.print('*');
}
Serial.print(F("\n\n"));
}
I used logic level convertor yf08e with a new ch376 module. The problem stills persists when I try to communicate via SPI. I am unable to figure out where the problem lies.
Hey, I am having a similar issue, same wiring as you but minus the logic shifting as I'm using a Nano, did you find a way around this? Otherwise any ideas would be appreciated.
