M J.
Implementation of reading and writing to AT25512N-SH SPI-Serial EEPROM. Use it in your own risk. Free software.
main.cpp@0:d6075c37f0a4, 2019-08-13 (annotated)
- Committer:
- mjm2016
- Date:
- Tue Aug 13 05:35:58 2019 +0000
- Revision:
- 0:d6075c37f0a4
Simple functions for writing and reading from SPI Serial EEPROM 512 Kbits (65,536x8)-AT25512N-SH. This might help you in understanding how the communications works with the flash memory.Please read the datasheet for further informations.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mjm2016 | 0:d6075c37f0a4 | 1 | #include "mbed.h" |
| mjm2016 | 0:d6075c37f0a4 | 2 | /** |
| mjm2016 | 0:d6075c37f0a4 | 3 | * Writing and reading from Serial Flash memory |
| mjm2016 | 0:d6075c37f0a4 | 4 | * AT25512N-SH |
| mjm2016 | 0:d6075c37f0a4 | 5 | * http://ww1.microchip.com/downloads/en/DeviceDoc/AT25512-SPI-Serial-EEPROM-512-Kbits-20006218A.pdf |
| mjm2016 | 0:d6075c37f0a4 | 6 | * Author : Mariwan jalal |
| mjm2016 | 0:d6075c37f0a4 | 7 | */ |
| mjm2016 | 0:d6075c37f0a4 | 8 | |
| mjm2016 | 0:d6075c37f0a4 | 9 | SPI device(SPI_MOSI, SPI_MISO, SPI_SCK); |
| mjm2016 | 0:d6075c37f0a4 | 10 | |
| mjm2016 | 0:d6075c37f0a4 | 11 | DigitalOut CS(SPI_CS); |
| mjm2016 | 0:d6075c37f0a4 | 12 | |
| mjm2016 | 0:d6075c37f0a4 | 13 | Serial pc(USBTX, USBRX); |
| mjm2016 | 0:d6075c37f0a4 | 14 | void read() |
| mjm2016 | 0:d6075c37f0a4 | 15 | { |
| mjm2016 | 0:d6075c37f0a4 | 16 | CS=1; |
| mjm2016 | 0:d6075c37f0a4 | 17 | int v=0; |
| mjm2016 | 0:d6075c37f0a4 | 18 | for(int i=0x200; i<0x210; i++) { |
| mjm2016 | 0:d6075c37f0a4 | 19 | wait_ms(1); |
| mjm2016 | 0:d6075c37f0a4 | 20 | CS=0; |
| mjm2016 | 0:d6075c37f0a4 | 21 | device.write(0x03); |
| mjm2016 | 0:d6075c37f0a4 | 22 | device.write((i&0xff00)>>8); |
| mjm2016 | 0:d6075c37f0a4 | 23 | device.write(i&0xff); |
| mjm2016 | 0:d6075c37f0a4 | 24 | v=device.write(0);///dummy |
| mjm2016 | 0:d6075c37f0a4 | 25 | CS=1; |
| mjm2016 | 0:d6075c37f0a4 | 26 | pc.printf("Results for i=%i : %x\n",i,v); |
| mjm2016 | 0:d6075c37f0a4 | 27 | } |
| mjm2016 | 0:d6075c37f0a4 | 28 | |
| mjm2016 | 0:d6075c37f0a4 | 29 | } |
| mjm2016 | 0:d6075c37f0a4 | 30 | void write() |
| mjm2016 | 0:d6075c37f0a4 | 31 | { |
| mjm2016 | 0:d6075c37f0a4 | 32 | for(int i=0x200; i<0x0210; i++) { |
| mjm2016 | 0:d6075c37f0a4 | 33 | CS=1; |
| mjm2016 | 0:d6075c37f0a4 | 34 | CS=0; |
| mjm2016 | 0:d6075c37f0a4 | 35 | wait_ms(1); |
| mjm2016 | 0:d6075c37f0a4 | 36 | device.write(0x01); |
| mjm2016 | 0:d6075c37f0a4 | 37 | device.write(0x00); |
| mjm2016 | 0:d6075c37f0a4 | 38 | CS=1; |
| mjm2016 | 0:d6075c37f0a4 | 39 | CS=0; |
| mjm2016 | 0:d6075c37f0a4 | 40 | device.write(0x6); |
| mjm2016 | 0:d6075c37f0a4 | 41 | CS=1; |
| mjm2016 | 0:d6075c37f0a4 | 42 | CS=0; |
| mjm2016 | 0:d6075c37f0a4 | 43 | device.write(0x02); |
| mjm2016 | 0:d6075c37f0a4 | 44 | device.write((i&0xff00)>>8); |
| mjm2016 | 0:d6075c37f0a4 | 45 | device.write(i&0xff); |
| mjm2016 | 0:d6075c37f0a4 | 46 | device.write((0xDA)); |
| mjm2016 | 0:d6075c37f0a4 | 47 | CS=1; |
| mjm2016 | 0:d6075c37f0a4 | 48 | pc.printf("Address= %x %x\n",((i&0xff00)>>8), (i&0xff)); |
| mjm2016 | 0:d6075c37f0a4 | 49 | } |
| mjm2016 | 0:d6075c37f0a4 | 50 | |
| mjm2016 | 0:d6075c37f0a4 | 51 | } |
| mjm2016 | 0:d6075c37f0a4 | 52 | int main() |
| mjm2016 | 0:d6075c37f0a4 | 53 | { |
| mjm2016 | 0:d6075c37f0a4 | 54 | pc.printf("device Started\n"); |
| mjm2016 | 0:d6075c37f0a4 | 55 | device.format(8, 0); |
| mjm2016 | 0:d6075c37f0a4 | 56 | device.frequency(1000000); |
| mjm2016 | 0:d6075c37f0a4 | 57 | pc.printf("START Write\n"); |
| mjm2016 | 0:d6075c37f0a4 | 58 | write(); |
| mjm2016 | 0:d6075c37f0a4 | 59 | pc.printf("START Read\n"); |
| mjm2016 | 0:d6075c37f0a4 | 60 | read(); |
| mjm2016 | 0:d6075c37f0a4 | 61 | } |