I am building a device to receive data from LoRa and save them into a MicroSD card.
I am using an esp32 Dev Kit V1, LoRa Ra 02, and a MicroSD card module for this.
I wired everything as below,
LoRa module -------------------- ESP32 board
MOSI -------------------- GPIO 23
MISO -------------------- GPIO 19
CLK -------------------- GPIO 18
CS -------------------- GPIO 5
MicroSD module -------------------- ESP32 board
MOSI -------------------- GPIO 23
MISO -------------------- GPIO 19
CLK -------------------- GPIO 18
CS -------------------- GPIO 25
Afterwards I uploaded the following code
#include <SPI.h>
#include <LoRa.h>
#include "FS.h"
#include "SD.h"
//define the pins used by the LoRa transceiver module
#define ss 5
#define rst 14
#define dio0 4 //originally it was 2
void listDir(fs::FS &fs, const char * dirname, uint8_t levels){
Serial.printf("Listing directory: %s\n", dirname);
File root = fs.open(dirname);
if(!root){
Serial.println("Failed to open directory");
return;
}
if(!root.isDirectory()){
Serial.println("Not a directory");
return;
}
File file = root.openNextFile();
while(file){
if(file.isDirectory()){
Serial.print(" DIR : ");
Serial.println(file.name());
if(levels){
listDir(fs, file.path(), levels -1);
}
} else {
Serial.print(" FILE: ");
Serial.print(file.name());
Serial.print(" SIZE: ");
Serial.println(file.size());
}
file = root.openNextFile();
}
}
void createDir(fs::FS &fs, const char * path){
Serial.printf("Creating Dir: %s\n", path);
if(fs.mkdir(path)){
Serial.println("Dir created");
} else {
Serial.println("mkdir failed");
}
}
void removeDir(fs::FS &fs, const char * path){
Serial.printf("Removing Dir: %s\n", path);
if(fs.rmdir(path)){
Serial.println("Dir removed");
} else {
Serial.println("rmdir failed");
}
}
void readFile(fs::FS &fs, const char * path){
Serial.printf("Reading file: %s\n", path);
File file = fs.open(path);
if(!file){
Serial.println("Failed to open file for reading");
return;
}
Serial.print("Read from file: ");
while(file.available()){
Serial.write(file.read());
}
file.close();
}
void writeFile(fs::FS &fs, const char * path, const char * message){
Serial.printf("Writing file: %s\n", path);
File file = fs.open(path, FILE_WRITE);
if(!file){
Serial.println("Failed to open file for writing");
return;
}
if(file.print(message)){
Serial.println("File written");
} else {
Serial.println("Write failed");
}
file.close();
}
void appendFile(fs::FS &fs, const char * path, const char * message){
Serial.printf("Appending to file: %s\n", path);
File file = fs.open(path, FILE_APPEND);
if(!file){
Serial.println("Failed to open file for appending");
return;
}
if(file.print(message)){
Serial.println("Message appended");
} else {
Serial.println("Append failed");
}
file.close();
}
void renameFile(fs::FS &fs, const char * path1, const char * path2){
Serial.printf("Renaming file %s to %s\n", path1, path2);
if (fs.rename(path1, path2)) {
Serial.println("File renamed");
} else {
Serial.println("Rename failed");
}
}
void deleteFile(fs::FS &fs, const char * path){
Serial.printf("Deleting file: %s\n", path);
if(fs.remove(path)){
Serial.println("File deleted");
} else {
Serial.println("Delete failed");
}
}
void testFileIO(fs::FS &fs, const char * path){
File file = fs.open(path);
static uint8_t buf[512];
size_t len = 0;
uint32_t start = millis();
uint32_t end = start;
if(file){
len = file.size();
size_t flen = len;
start = millis();
while(len){
size_t toRead = len;
if(toRead > 512){
toRead = 512;
}
file.read(buf, toRead);
len -= toRead;
}
end = millis() - start;
Serial.printf("%u bytes read for %u ms\n", flen, end);
file.close();
} else {
Serial.println("Failed to open file for reading");
}
file = fs.open(path, FILE_WRITE);
if(!file){
Serial.println("Failed to open file for writing");
return;
}
size_t i;
start = millis();
for(i=0; i<2048; i++){
file.write(buf, 512);
}
end = millis() - start;
Serial.printf("%u bytes written for %u ms\n", 2048 * 512, end);
file.close();
}
void setup() {
Serial.begin(9600);
while (!Serial);
if(!SD.begin(25)){
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD.cardType();
if(cardType == CARD_NONE){
Serial.println("No SD card attached");
return;
}
Serial.print("SD Card Type: ");
if(cardType == CARD_MMC){
Serial.println("MMC");
} else if(cardType == CARD_SD){
Serial.println("SDSC");
} else if(cardType == CARD_SDHC){
Serial.println("SDHC");
} else {
Serial.println("UNKNOWN");
}
uint64_t cardSize = SD.cardSize() / (1024 * 1024);
Serial.printf("SD Card Size: %lluMB\n", cardSize);
listDir(SD, "/", 0);
readFile(SD, "/data/samples.txt");
Serial.println("LoRa Receiver");
LoRa.setPins(ss, rst, dio0); //setup LoRa transceiver module
if (!LoRa.begin(433E6)) {
Serial.println("Starting LoRa failed!");
while (1);
}
}
void loop() {
// try to parse packet
int packetSize = LoRa.parsePacket();
if (packetSize) {
// received a packet
Serial.print("Received packet '");
// read packet
while (LoRa.available()) {
Serial.print((char)LoRa.read());
}
// print RSSI of packet
Serial.print("' with RSSI ");
Serial.println(LoRa.packetRssi());
}
}
After running this, I can see that the SD card is being initialized and read but the LoRa initialization fails. I checked all the connections they are ok.
I used the LoRa module without the SD card using a different sketch, then it worked.
Below is the serial monitor output for the above sketch.
Card Type: SDHC
SD Card Size: 7680MB
Listing directory: /
DIR : System Volume Information
FILE: test.txt SIZE: 1040384
DIR : mydir
FILE: foo.txt SIZE: 13
FILE: hello.txt SIZE: 13
DIR : data
Reading file: /data/samples.txt
Read from file: 005,11.00,9.00,27.00,1333.00,40.00
005,67.00,7.00,45.00,9147.00,69.00
005,0.00,3.00,76.00,2173.00,9.00
005,40.00,0.00,49.00,6397.00,80.00
005,6.00,43.00,78.00,6985.00,24.00
005,76.00,47.00,54.00,1524.00,16.00
LoRa Receiver
Starting LoRa failed!
Does anybody have any suggestions to fix this ?
