M J.
Implementation of reading and writing to AT25512N-SH SPI-Serial EEPROM. Use it in your own risk. Free software.
Revision 0:d6075c37f0a4, committed 2019-08-13
- Comitter:
- mjm2016
- Date:
- Tue Aug 13 05:35:58 2019 +0000
- Commit message:
- 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.
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed-os.lib | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r d6075c37f0a4 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Aug 13 05:35:58 2019 +0000
@@ -0,0 +1,61 @@
+#include "mbed.h"
+/**
+* Writing and reading from Serial Flash memory
+* AT25512N-SH
+* http://ww1.microchip.com/downloads/en/DeviceDoc/AT25512-SPI-Serial-EEPROM-512-Kbits-20006218A.pdf
+* Author : Mariwan jalal
+*/
+
+SPI device(SPI_MOSI, SPI_MISO, SPI_SCK);
+
+DigitalOut CS(SPI_CS);
+
+Serial pc(USBTX, USBRX);
+void read()
+{
+ CS=1;
+ int v=0;
+ for(int i=0x200; i<0x210; i++) {
+ wait_ms(1);
+ CS=0;
+ device.write(0x03);
+ device.write((i&0xff00)>>8);
+ device.write(i&0xff);
+ v=device.write(0);///dummy
+ CS=1;
+ pc.printf("Results for i=%i : %x\n",i,v);
+ }
+
+}
+void write()
+{
+ for(int i=0x200; i<0x0210; i++) {
+ CS=1;
+ CS=0;
+ wait_ms(1);
+ device.write(0x01);
+ device.write(0x00);
+ CS=1;
+ CS=0;
+ device.write(0x6);
+ CS=1;
+ CS=0;
+ device.write(0x02);
+ device.write((i&0xff00)>>8);
+ device.write(i&0xff);
+ device.write((0xDA));
+ CS=1;
+ pc.printf("Address= %x %x\n",((i&0xff00)>>8), (i&0xff));
+ }
+
+}
+int main()
+{
+ pc.printf("device Started\n");
+ device.format(8, 0);
+ device.frequency(1000000);
+ pc.printf("START Write\n");
+ write();
+ pc.printf("START Read\n");
+ read();
+}
\ No newline at end of file
diff -r 000000000000 -r d6075c37f0a4 mbed-os.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os.lib Tue Aug 13 05:35:58 2019 +0000 @@ -0,0 +1,1 @@ +https://github.com/ARMmbed/mbed-os/#c966348d3f9ca80843be7cdc9b748f06ea73ced0