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Read from file
Description
Read file contents from flash chip.The result is sending back to the serial port.
Note: This function can't run in commands set.
Usage:
|
Direct: |
"fREADfilename ",following with 3 bytes MSB of start pointer from the begin of file, then 3 bytes MSB of data length to be read |
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Arduino: |
void readFile(const char * fname, uint32_t start,uint32_t length) |
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C: |
void Digole_readFile(const char * fname, uint24_t start,uint24_t length) |
Parameters:
fname
Specify the file name in flash memory.
start
The pointer of start to read in file, count from the beginning of the file. 3 bytes value, MSB first.
length
The length of bytes want to read. If don't have enough bytes in file (file size-start less then length), then only actual bytes of data read out.
Example (Arduino):
unsigned char data[64];
mydisp.readFile("hello.txt",512,64); //read 64 bytes from file of hello.txt, begin from the 512 byte
//read out the 64 bytes data from serial port
mydisp.cleanBuffer(); //clean the receiving buffer
for(char i=0;i<64;i++){
data[i]=mydisp.read1();
}
Example(direct)
unsigned char data[64];
serial.writeString("fREADhello.txt ");
serial.write(0); //MSB of start
serial.write(2);
serial.write(0); //LSB of start
serial.write(0); //MSB of length
serial.write(0);
serial.write(64); //LSB of length
for(char i=0;i<64;i++){
data[i]=serial.read();
}
Changelog
| Version | Description |
|---|---|
| V7 | function was added. |