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Hi I Have problem to run the I2C on 89c669. // function init_i2c // initializes the I2C peripheral void init_i2c(void) { P1 |= 0xC0; // set P1.6 and P1.7 open drain TMOD |= 0x01; // timer 0 mode 1 EI2C = 1; // enable I2C interrupts EA = 1; // global interrupt enable } // function rtc_write_byte // stores a byte in a specific register in the Real Time Clock // passed is the register address and the byte to store // nothing is returned // result of the operation is stored in i2c_status and may be // I2C_OK or I2C_ERROR void rtc_write_byte(unsigned char address, unsigned char byte) { i2c_storage_address = address; // copy the register address i2c_byte = chartobcd(byte); // convert to BCD and copy the byte i2c_status = I2C_BUSY; // I2C is now busy i2c_operation = WRITE; // a write operation is being performed I2CON = 0x40; // enable the I2C perhiperal // no acknowledgements will be returned I2CON |= 0x20; // request a start condition is transmitted // therefore putting I2C perhiperal in Master Transmitter mode while(i2c_status == I2C_BUSY); // wait until I2C is not busy } and after that i wait for an Interrupt. But nothing happens. I've changed my sfr to sfr I2ADR = 0x94; sfr I2CON = 0x91; sfr I2DAT = 0x93; sfr I2CLH = 0x96; sfr I2CLL = 0x95; sfr I2STA = 0x92; Need help please. /Ingo
My best suggestion (I used it for the 668) is to use codearchitect (http://www.esacademy.com) which will generate the code for a LPC932. It is very simple to modify the code to match a 66x. Erik
My code works on 664, but i need 2 uart and thats why i will use 669. I think that i have some problems with the sfr's but can't find out what. Anyone who has an header for 669, please replay. /Ingo
Anyone who has an header for 669 The datasheet 'does' I always make my own. My name allow global search on bits and sfrs regardless of the use. I have seen too many lenghty debug sessions due to things like IE = and EX0 = not coming out in the same search. my names are e.g.
sfr SF_IE = 0xA8; sbit SB_IE_EX0 = 0xA8; #define SM_IE_EX0 0x01