Akhil P
The Sample program to interface AT93C56 EEPROM IC with STM32F103RB controller.
Revision 0:d6477e83445b, committed 2014-10-31
- Comitter:
- akhilpanayamparambil
- Date:
- Fri Oct 31 07:01:08 2014 +0000
- Commit message:
- Interface code for AT93C56A;
Changed in this revision
diff -r 000000000000 -r d6477e83445b main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Oct 31 07:01:08 2014 +0000
@@ -0,0 +1,141 @@
+#include "mbed.h"
+
+#define EE_READ 0x400 // 10 XXXXXXXXX(A8-A0)
+#define EE_WRITE 0x200 // 01 XXXXXXXXX(A8-A0)
+#define EE_EWEN 0x1FF // 00 11XXXXXXX(X is DONT CARE)
+#define EE_EWDS 0x000 // 00 00XXXXXXX(X is DONT CARE)
+#define EE_ERASE 0x600 // 11 XXXXXXXXX(A8-A0)
+
+Serial device(PA_9, PA_10); // tx, rx
+DigitalOut CS(PC_0);
+DigitalOut CK(PB_13);
+DigitalIn DI(PB_14);
+DigitalOut DO(PB_15);
+
+void vSend(unsigned short usCommand)
+{
+ signed char i=10;
+ DO=1; //SB
+ CS=1; // Chip Select High
+ wait_us(1); // SB Clock Generation
+ CK=1;
+ wait_us(1);
+ CK=0;
+ while(i>=0)
+ {
+ DO = (usCommand>>i)&0x01;
+ i--;
+ wait_us(1);
+ CK=1;
+ wait_us(1);
+ CK=0;
+ }
+}
+void vWriteEnable()
+{
+ vSend(EE_EWEN);
+ wait_us(1);
+ CS=0; //Chip Select Low
+}
+void vWriteDisable()
+{
+ vSend(EE_EWDS);
+ wait_us(1);
+ CS=0; //Chip Select Low
+}
+void vErase(unsigned short usAddr)
+{
+ vSend(EE_ERASE|usAddr);
+ wait_us(1);
+ CS=0;
+/** wait busy flag clear */
+ wait_us(1); // tcs > 250ns @2.7V
+ CS=1;
+ wait_us(1); // tsv < 250ns @2.7V
+ while(DI==0); // 0.1ms < twp < 10ms
+ CS=0;
+}
+void vWrite(unsigned short usAddr, unsigned char ucData)
+{
+ signed char i=7;
+ vSend(EE_WRITE|usAddr);
+ for(i=7;i>=0;i--)
+ {
+ DO = (int)( (ucData>>i)&0x0001 );
+ wait_us(1);
+ CK=1;
+ wait_us(1);
+ CK=0;
+ }
+ CS=0;
+/** wait busy flag clear */
+ wait_us(1); // tcs > 250ns @2.7V
+ CS=1;
+ wait_us(1); // tsv < 250ns @2.7V
+ while(DI==0); // 0.1ms < twp < 10ms
+ CS=0;
+}
+unsigned char ucRead(unsigned short usAddr)
+{
+ unsigned char data=0;
+ signed char i=7;
+
+ vSend(EE_READ|usAddr);
+ wait_us(1);
+
+ for(i=7;i>=0;i--)
+ {
+ CK=1;
+ wait_us(1);
+ CK=0;
+ data = data | (DI<<i);
+ wait_us(1);
+ }
+ CS=0;
+
+ return data;
+}
+int main()
+{
+ unsigned char ucI=0;
+
+ CS = 0; //default state for Chip Select and Clock
+ CK = 0;
+
+ device.baud(19200);
+ device.printf("The Program demostrating the IC AT93C56 EEPROM \r\n");
+
+ device.printf("Going to Write Enable \r\n");
+ vWriteEnable();
+
+ device.printf("Going to Erase Addr 0 \r\n");
+ vErase(0);
+ device.printf("Going to Write Value AA to Addr 0 \r\n");
+ vWrite(0,0xAA);
+ device.printf("Read Back Value %04X\r\n,",ucRead(0));
+
+ device.printf("Going to Erase Addr 1 \r\n");
+ vErase(1);
+ device.printf("Going to Write Value BB to Addr 1 \r\n");
+ vWrite(1,0xBB);
+ device.printf("Read Back Value %04X\r\n,",ucRead(1));
+
+ device.printf("Going to Erase Addr 2 \r\n");
+ vErase(2);
+ device.printf("Going to Write Value CC to Addr 2 \r\n");
+ vWrite(2,0xCC);
+ device.printf("Read Back Value %04X\r\n,",ucRead(2));
+
+ device.printf("Going to Write Disable \r\n");
+
+ vWriteDisable();
+
+ while(1)
+ {
+ for(ucI=0;ucI<64;ucI++)
+ {
+ device.printf("%04X ============== %d\r\n,",ucRead(ucI),ucI);
+ wait(0.5);
+ }
+ }
+}
diff -r 000000000000 -r d6477e83445b mbed-rtos.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Fri Oct 31 07:01:08 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-rtos/#1be1070d822f
diff -r 000000000000 -r d6477e83445b mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Oct 31 07:01:08 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/031413cf7a89 \ No newline at end of file