Hi,
First of all, Freescale, I hate your datasheets !
But I like the forum, anyway... 
I'm living interesting problem with I2C and EEPROM AT24C512BN.
If I debug test routine below, it works, "count" be equal to "okunan".
If I directly run the code, it fails at EE_ReadBuffer function. The function returns 0.
Code:
Test routine: count = 0x89654321; // unsigned long
Init_i2c(); if(EE_WriteBuffer(0, &count, 4, I2C_ADR_EEPROM0)) DispMsg(MSG_FILL, 0); else DispMsg(MSG_ERROR_CODE, 1); if(EE_ReadBuffer(0, &okunan, 4, I2C_ADR_EEPROM0)) DispMsg(MSG_FILL, 0); else DispMsg(MSG_ERROR_CODE, 2); if(count == okunan) DispMsg(MSG_FILL, 0); else DispMsg(MSG_ERROR_CODE, 3);
If I change the i2c_start() function such as below: It start working in debug or not.
Code:
void i2c_start(void){ IIC1S_SRW = 0; // R/W bit = 0; IIC1C_IICEN = 0; IIC1C = 0b10011000; IIC1C_MST = 1; // generate START condition}I don't understand the problem due to the datasheet doesn't explain I2C module well.
Regards,
BP.
Code:
void Init_i2c(void){ // Bus = 18.432MHz; // mul=4, ICR=0x0D => SCL Div=48, i2c_ Bus Freq = 96Khz, SDA Hold Time = 600ns IIC1F = 0b10001101; IIC1S_SRW = 0; // R/W bit = 0; // Enable i2c module // not generate ACK by master after transfer; // TX mode // Slave mode actually; IIC1C = 0b10011000; }void i2c_start(void){ IIC1C_MST = 1; // generate START condition}void i2c_stop(void){ IIC1C_MST = 0; // generate STOP condition; }void i2c_restart(void){ IIC1C_RSTA = 1; // generate RESTART condition}void i2c_sendbyte(unsigned char data){ IIC1C_TX = 1; // transmit IIC1D = data; while(!IIC1S_IICIF); // wait until Transfer to complete; IIC1S_IICIF = 1;}char i2c_getack(void){ return(!IIC1S_RXAK); // ACK gelmiş ise 1 döner, gelmemişse 0}unsigned char i2c_getbyte(char send_ack){ unsigned char data; IIC1C_TX = 0; // set up to receive; IIC1C_TXAK = send_ack—0:1; data = IIC1D; // dummy read; while(!IIC1S_IICIF); // wait until Transfer to complete; IIC1S_IICIF = 1; data = IIC1D; // read right data; return(data);}/////////////////////////////////////////////////////////////////////////////////// EEPROM RUTINLERI Atmel AT24C512BN-SH-B veya ST M24512-RM/////////////////////////////////////////////////////////////////////////////////unsigned char EE_WaitForACK(unsigned char external_adr){ unsigned char counter = 100; unsigned char ack; unsigned char ControlByte = 0b10100000; // Yazma modu, A2, A1, A0 = 0 ControlByte |= ((external_adr << 1) & 0b00001110); do { i2c_start(); i2c_sendbyte(ControlByte); ack = i2c_getack(); // i2cgetack, ack alınmış ise 1 döner! i2c_stop(); --counter; // her deneme 175uS sürüyor, 29 deneme > 5ms yapar. } while(!ack && (counter != 0)); return(ack);}unsigned char EE_ReadBuffer(unsigned int Adr, unsigned char* Data, unsigned int size, unsigned char external_adr){ // Control Byte = 1 0 1 0 A2 A1 A0 R/W. unsigned char ControlByte = 0b10100000; // Yazma modu, A2, A1, A0 = 0 unsigned char AddrHigh = (Adr >> 8) & 0xFF; unsigned char AddrLow = (Adr & 0xFF); ControlByte |= ((external_adr << 1) & 0b00001110); i2c_start(); // Control Byte = 1 0 1 0 A2 A1 A0 R/W i2c_sendbyte(ControlByte); if(!i2c_getack()) { i2c_stop(); return(0); } // Address High Byte i2c_sendbyte(AddrHigh); if(!i2c_getack()) { i2c_stop(); return(0); } // Address Low Byte i2c_sendbyte(AddrLow); if(!i2c_getack()) { i2c_stop(); return(0); } // Read i2c_restart(); // Control Byte to read ControlByte |= 0b00000001; // Okuma modu i2c_sendbyte(ControlByte); if(!i2c_getack()) { i2c_stop(); return(0); } do { *Data++ = i2c_getbyte(size != 1); } while(--size); i2c_stop(); return(1);}char EE_WriteBuffer(unsigned int Adr, unsigned char* Data, unsigned int size, unsigned char external_adr){ unsigned int _PAGE = 0xFFFF; // önceki page do { unsigned int CURRENT_PAGE = Adr & 0b1111111110000000; // page size 128 byte if(CURRENT_PAGE != _PAGE) { // Control Byte = 1 0 1 0 A2 A1 A0 R/W. unsigned char ControlByte = 0b10100000; // Yazma modu, A2, A1, A0 = 0 unsigned char AddrHigh = (Adr >> 8) & 0xFF; unsigned char AddrLow = (Adr & 0xFF); ControlByte |= ((external_adr << 1) & 0b00001110); if(_PAGE != 0xFFFF) { i2c_stop(); if(!EE_WaitForACK(external_adr)) return(0); } i2c_start(); // Control Byte = 1 0 1 0 A2 A1 A0 R/W. i2c_sendbyte(ControlByte); if(!i2c_getack()) { i2c_stop(); return(0); } // Address High Byte i2c_sendbyte(AddrHigh); if(!i2c_getack()) { i2c_stop(); return(0); } // Address Low Byte i2c_sendbyte(AddrLow); if(!i2c_getack()) { i2c_stop(); return(0); } _PAGE = CURRENT_PAGE; } //if(CURRENT_PAGE != _PAGE) i2c_sendbyte(*Data++); if(!i2c_getack()) { i2c_stop(); return(0); } Adr++; } while(--size); i2c_stop(); return(EE_WaitForACK(external_adr));}Message Edited by BasePointer on 2007-09-12 04:50 PM
