Flotsam / EEPROMWrite

Basic read/write from flash.

Dependencies:   mbed-modifed

main.cpp@2:118a2f154b78, 2015-11-09 (annotated)

Committer:
Dilsher
Date:
Mon Nov 09 19:44:16 2015 +0000
Revision:
2:118a2f154b78
Parent:
1:397846763432
Child:
3:50a42705f3ea
Removed ResetADC

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ptcrews 0:cb78df310c5f 1 #include "mbed.h"
ptcrews 0:cb78df310c5f 2
ptcrews 0:cb78df310c5f 3 //define where the EEPROM begins
ptcrews 0:cb78df310c5f 4 #define stadr 0x08080000
ptcrews 0:cb78df310c5f 5
ptcrews 0:cb78df310c5f 6 Serial pcSerial(USBTX, USBRX);
ptcrews 0:cb78df310c5f 7
ptcrews 0:cb78df310c5f 8 //Our current offset in the EEPROM
ptcrews 0:cb78df310c5f 9 int offset = 0;
Dilsher 1:397846763432 10 int roffset = 0;
ptcrews 0:cb78df310c5f 11
ptcrews 0:cb78df310c5f 12 //This function writes a byte of data to the EEPROM at the appropriate location.
ptcrews 0:cb78df310c5f 13 //This is called by my writeEEPROMbytes.
ptcrews 0:cb78df310c5f 14 //Use this if you want to write a single byte.
ptcrews 0:cb78df310c5f 15 HAL_StatusTypeDef writeEEPROMByte(uint8_t data)
ptcrews 0:cb78df310c5f 16 {
ptcrews 0:cb78df310c5f 17 HAL_StatusTypeDef status;
ptcrews 0:cb78df310c5f 18 int address = offset + stadr;
ptcrews 0:cb78df310c5f 19 offset++;
ptcrews 0:cb78df310c5f 20 HAL_FLASHEx_DATAEEPROM_Unlock(); //Unprotect the EEPROM to allow writing
ptcrews 0:cb78df310c5f 21 status = HAL_FLASHEx_DATAEEPROM_Program(TYPEPROGRAMDATA_BYTE, address, data);
ptcrews 0:cb78df310c5f 22 HAL_FLASHEx_DATAEEPROM_Lock(); // Reprotect the EEPROM
ptcrews 0:cb78df310c5f 23 return status;
ptcrews 0:cb78df310c5f 24 }
ptcrews 0:cb78df310c5f 25
ptcrews 0:cb78df310c5f 26 //This function takes an array of bytes and its size and writes them to the EEPROM
ptcrews 0:cb78df310c5f 27 //Use this if you want to write a lot of bytes.
ptcrews 0:cb78df310c5f 28 void writeEEPROMbytes(uint8_t* data, uint8_t size)
ptcrews 0:cb78df310c5f 29 {
ptcrews 0:cb78df310c5f 30 for(int i = 0; i < size; i++)
ptcrews 0:cb78df310c5f 31 {
ptcrews 0:cb78df310c5f 32 writeEEPROMByte(data[i]);
ptcrews 0:cb78df310c5f 33 }
ptcrews 0:cb78df310c5f 34 }
ptcrews 0:cb78df310c5f 35
ptcrews 0:cb78df310c5f 36 //This function reads a byte of data from the EEPROM at the offset passed in.
ptcrews 0:cb78df310c5f 37 //This is called by my getEEPROM function
ptcrews 0:cb78df310c5f 38 uint8_t readEEPROMByte(uint32_t off) {
ptcrews 0:cb78df310c5f 39 uint8_t tmp = 0;
ptcrews 0:cb78df310c5f 40 off = off + stadr;
ptcrews 0:cb78df310c5f 41 tmp = *(__IO uint32_t*)off;
ptcrews 0:cb78df310c5f 42
ptcrews 0:cb78df310c5f 43 return tmp;
ptcrews 0:cb78df310c5f 44 }
ptcrews 0:cb78df310c5f 45
ptcrews 0:cb78df310c5f 46 //Call this function when you have sent all the data in the EEPROM through GSM
ptcrews 0:cb78df310c5f 47 //It just resets the offset to 0 so we start writing from the start.
ptcrews 0:cb78df310c5f 48 void resetEEPROM()
ptcrews 0:cb78df310c5f 49 {
ptcrews 0:cb78df310c5f 50 offset = 0;
ptcrews 0:cb78df310c5f 51 }
ptcrews 0:cb78df310c5f 52
ptcrews 0:cb78df310c5f 53 //This returns an array of bytes with size offset, that contains the entire EEPROM
ptcrews 0:cb78df310c5f 54 //Call this function when you want to send the data over GSM
Dilsher 1:397846763432 55 void getEEPROM(uint8_t *ptr, int nbytes)
ptcrews 0:cb78df310c5f 56 {
Dilsher 1:397846763432 57 for(int i = 0; i < nbytes; i++)
ptcrews 0:cb78df310c5f 58 {
Dilsher 1:397846763432 59 ptr[i] = readEEPROMByte(roffset+i);
ptcrews 0:cb78df310c5f 60 }
ptcrews 0:cb78df310c5f 61 return;
ptcrews 0:cb78df310c5f 62 }
ptcrews 0:cb78df310c5f 63
ptcrews 0:cb78df310c5f 64 int main(){
ptcrews 0:cb78df310c5f 65 resetEEPROM();
ptcrews 0:cb78df310c5f 66 pcSerial.printf("testing:\n");
ptcrews 0:cb78df310c5f 67 uint8_t test[] = "testing byte write and retrieval\0";
ptcrews 0:cb78df310c5f 68 uint8_t len = strlen((char*)test);
ptcrews 0:cb78df310c5f 69 writeEEPROMbytes(test, len);
ptcrews 0:cb78df310c5f 70 pcSerial.printf("write success\n");
ptcrews 0:cb78df310c5f 71 uint8_t fullStr[offset+1];
Dilsher 1:397846763432 72 getEEPROM(fullStr, 10);
ptcrews 0:cb78df310c5f 73 pcSerial.printf("String: %s\n", fullStr);
ptcrews 0:cb78df310c5f 74 }