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Program to write and read a byte between P89V51RD2 and ST M24C64

Sandy Sandy

Hello All,

I am finding it really hard to perform write and read operations on the EEPROM connected to the MCU by two wires using the I2C Protocol.

I've read the data sheets, written the code exactly matching the datasheet info, but it was of no avail.

Please help me out.

My code looks something like this

void Write_Start(void)
        {
                E2P_SDA = 1;
                E2P_SCL = 1;
                delay_i2c();
                E2P_SDA = 0;
                delay_i2c();
                E2P_SCL = 0;
                delay_i2c();
        }

void Write_to_E2P(void)
        {
                unsigned char DEV_SEL_CODE = 0x0A0;
                unsigned char ADDR_MSB = 0x50;
                unsigned char ADDR_LSB = 0x05;
                unsigned char i;

                Write_Start();

                for(i=7;i>=0;i--)
                        {
                                E2P_SDA = DEV_SEL_CODE^i;
                                E2P_SCL = 0;
                                delay_i2c();
                                E2P_SCL = 1;
                                delay_i2c();
                        }

                E2P_SDA = 1;
                E2P_SCL = 0;
                delay_i2c();
                E2P_SCL = 1;
                delay_i2c();
                delay_i2c();
                E2P_SCL = 0;
                delay_i2c();

                if(E2P_SDA == 0)
                        LED1=1;

                for(i=7;i>=0;i--)
                        {
                                E2P_SDA = ADDR_MSB^i;
                                E2P_SCL = 0;
                                delay_i2c();
                                E2P_SCL = 1;
                                delay_i2c();
                        }

                E2P_SDA = 1;
                E2P_SCL = 0;
                delay_i2c();
                E2P_SCL = 1;
                delay_i2c();
                delay_i2c();
                E2P_SCL = 0;
                delay_i2c();

                if(E2P_SDA == 0)
                        LED2=1;

                for(i=7;i>=0;i--)
                        {
                                E2P_SDA = ADDR_LSB^i;
                                E2P_SCL = 0;
                                delay_i2c();
                                E2P_SCL = 1;
                                delay_i2c();
                        }

                E2P_SDA = 1;
                E2P_SCL = 0;
                delay_i2c();
                E2P_SCL = 1;
                delay_i2c();
                delay_i2c();
                E2P_SCL = 0;
                delay_i2c();

                if(E2P_SDA == 0)
                        LED3=1;

                for(i=7;i>=0;i--)
                        {
                                E2P_SDA = current_channel^i;
                                E2P_SCL = 0;
                                delay_i2c();
                                E2P_SCL = 1;
                                delay_i2c();
                        }

                E2P_SDA = 1;
                E2P_SCL = 0;
                delay_i2c();
                E2P_SCL = 1;
                delay_i2c();
                delay_i2c();
                E2P_SCL = 0;
                delay_i2c();

                if(E2P_SDA == 0)
                        LED4=1;


        }

Parents
  • 0 in reply to Tamir Michael

    But why do you think this is a less worthy contribution? What not to do is sometimes a good guideline (try this: "don't shoot elephants"). Overly touchy, Jenit?

    You're somehow continuing to miss the point, which is not a comment on the merit of the contribution but the pig-ignorant tone with which it was presented. Jenit probably hasn't been reading this forum for long enough to realise that a number of the regular contributors suffer from varying degrees of ignorance and/or delusion.

Reply
  • 0 in reply to Tamir Michael

    But why do you think this is a less worthy contribution? What not to do is sometimes a good guideline (try this: "don't shoot elephants"). Overly touchy, Jenit?

    You're somehow continuing to miss the point, which is not a comment on the merit of the contribution but the pig-ignorant tone with which it was presented. Jenit probably hasn't been reading this forum for long enough to realise that a number of the regular contributors suffer from varying degrees of ignorance and/or delusion.

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