Revision 0:51d7f8d33957, committed 2018-08-20
- Comitter:
- turumputum
- Date:
- Mon Aug 20 17:44:43 2018 +0000
- Commit message:
- 122
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Aug 20 17:44:43 2018 +0000
@@ -0,0 +1,80 @@
+#include "mbed.h"
+
+
+int address = 0xA0;
+
+
+DigitalOut VCC(PB_5);
+DigitalOut GND(PB_13);
+I2C i2c(PB_4, PA_8);
+
+DigitalOut myled(LED1);
+
+Serial pc(SERIAL_TX, SERIAL_RX);
+
+
+void writeEEPROM(int address, unsigned int eeaddress, char *data, int size);
+void readEEPROM(int address, unsigned int eeaddress, char *data, int size);
+
+
+// this function has 63 bytes write limit
+void writeEEPROM(int address, unsigned int eeaddress, char *data, int size)
+{
+ char i2cBuffer[size + 2];
+ i2cBuffer[0] = (unsigned char)(eeaddress >> 8); // MSB
+ i2cBuffer[1] = (unsigned char)(eeaddress & 0xFF); // LSB
+
+ for (int i = 0; i < size; i++) {
+ i2cBuffer[i + 2] = data[i];
+ }
+
+ int result = i2c.write(address, i2cBuffer, size + 2, false);
+ wait_ms(6);
+}
+
+// this function has no read limit
+void readEEPROM(int address, unsigned int eeaddress, char *data, int size)
+{
+ char i2cBuffer[2];
+ i2cBuffer[0] = (unsigned char)(eeaddress >> 8); // MSB
+ i2cBuffer[1] = (unsigned char)(eeaddress & 0xFF); // LSB
+
+ // Reset eeprom pointer address
+ int result = i2c.write(address, i2cBuffer, 2, false);
+ wait_ms(6);
+
+ // Read eeprom
+ i2c.read(address, data, size);
+ wait_ms(6);
+}
+
+
+int main()
+{
+
+ VCC=1;
+ GND=0;
+
+ pc.printf("I2C EEPROM started...\n");
+
+ int pointerAdddress = 0;
+
+ wait_ms(3000);
+
+ // write some data on eeprom
+ char writeData[] = {"1234567890"}; // the text length must be below 64 bytes
+ char writeDataLen = 0;
+ do {writeDataLen++;} while (writeData[writeDataLen]); // calculate the text length
+
+ writeEEPROM(address, pointerAdddress, writeData, writeDataLen);
+
+ pc.printf("Data written: %s\n", writeData);
+
+
+ // read the data back
+ char data_read[writeDataLen];
+ readEEPROM(address, pointerAdddress, data_read, writeDataLen);
+
+ pc.printf("Data read: %s\n", data_read);
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld Mon Aug 20 17:44:43 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/a7c7b631e539
\ No newline at end of file
Александр Селифонов
