/*
* This function reads the slave device's register
*
* Parameters:
* addr - i2c Slave device address which register
* to be read from
* reg - Slave device's register to be read
*
* Return Value:
* Register value
*/
unsigned char sm750_sw_i2c_read_reg(
unsigned char addr,
unsigned char reg
)
{
unsigned char data;
/* Send the Start signal */
sw_i2c_start();
/* Send the device address */
sw_i2c_write_byte(addr);
/* Send the register index */
sw_i2c_write_byte(reg);
/* Get the bus again and get the data from the device read address */
sw_i2c_start();
sw_i2c_write_byte(addr + 1);
data = sw_i2c_read_byte(1);
/* Stop swI2C and release the bus */
sw_i2c_stop();
return data;
}
/*---------------------------------------------------------------------------*/
u08 EEPROM_RandomRead(u16 Address)
// Description:
// Random Read Operation. Data is read from the EEPROM. The EEPROM
// address is defined with the parameter Address.
{
char data_in;
#if (defined I2C_SW && I2C_SW == 1)
sw_i2c_start(); // Send start signal
sw_i2c_write(EEPROMAddress);// Send identifer I2C address (10100000b)
delay_time(I2C_DELAY);
sw_i2c_write((unsigned char) (high_byte(Address)));// Send address to EEPROM
delay_time(I2C_DELAY);
sw_i2c_write((unsigned char) Address);// Send address to EEPROM
delay_time(I2C_DELAY);
sw_i2c_start();// Send I2C Start Transfer
sw_i2c_write(EEPROMAddress + 1);// Send identifer I2C address (10100001b)
delay_time(I2C_DELAY);
data_in = sw_i2c_read(0);// Read byte
sw_i2c_stop(); // Send I2C Stop Transfer
#else
/* Dummy write: Transmite NULL depois gera um sinal de start repeated */
IIC_transmite(EEPROMAddress, Address, NULL);
IIC_recebe(EEPROMAddress, &data_in);
#endif
return data_in;
}
/*---------------------------------------------------------------------------*/
INT8U RTC_RandomRead(INT8U Address)
// Description:
// Random Read Operation. Data is read from the RTC. The RTC
// address is defined with the parameter Address.
{
INT8U data_in;
#if (defined I2C_SW && I2C_SW == 1)
CRITICAL_SECTION_START();
sw_i2c_start(); // Send start signal
sw_i2c_write(DS1307Address); // Send identifer I2C address (10100000b)
delay_time(I2C_DELAY);
sw_i2c_write((INT8U) Address); // Send address to EEPROM
delay_time(I2C_DELAY);
sw_i2c_start(); // Send I2C Start Transfer
sw_i2c_write(DS1307Address | 1); // Send identifer I2C address (10100001b)
delay_time(I2C_DELAY);
data_in = sw_i2c_read(0); // Read byte
sw_i2c_stop(); // Send I2C Stop Transfer
CRITICAL_SECTION_END();
#else
IIC_transmite(DS1307Address, Address, NULL);
IIC_recebe(DS1307Address, &data_in);
#endif
return data_in;
}
/*
* This function writes a value to the slave device's register
*
* Parameters:
* addr - i2c Slave device address which register
* to be written
* reg - Slave device's register to be written
* data - Data to be written to the register
*
* Result:
* 0 - Success
* -1 - Fail
*/
long sm750_sw_i2c_write_reg(
unsigned char addr,
unsigned char reg,
unsigned char data
)
{
long ret = 0;
/* Send the Start signal */
sw_i2c_start();
/* Send the device address and read the data. All should return success
* in order for the writing processed to be successful
*/
if ((sw_i2c_write_byte(addr) != 0) ||
(sw_i2c_write_byte(reg) != 0) ||
(sw_i2c_write_byte(data) != 0)) {
ret = -1;
}
/* Stop i2c and release the bus */
sw_i2c_stop();
return ret;
}
void EEPROM_ByteWrite(u16 Address, u08 Data)
// Description:
// Byte Write Operation. The communication via the I2C bus with an EEPROM
// (2465) is realized. A data byte is written into a user defined address.
{
/* i2c por SW */
#if (defined I2C_SW && I2C_SW == 1)
sw_i2c_start(); // Send start signal
sw_i2c_write(EEPROMAddress & 0b11111110);// Send identifier I2C address 0xA0 = 10100000b
delay_time(I2C_DELAY);
sw_i2c_write((unsigned char)(high_byte(Address)));// Send address to EEPROM (high byte address)
delay_time(I2C_DELAY);
sw_i2c_write((unsigned char) Address);// Send address to EEPROM (low byte address)
delay_time(I2C_DELAY);
sw_i2c_write(Data);// Send low byte to EEPROM (data to write)
delay_time(I2C_DELAY);// Delay a period of time to write
sw_i2c_stop(); // Send I2C Stop Transfer
delay_time(20); // Delay a period of time to write
DelayTask(WRITE_CYCLE_TIME);
#else
/* i2c por HW */
IIC_transmite(EEPROMAddress, Address, &Data);
#endif
}
int sw_i2c_read(unsigned char chip, unsigned char location, unsigned char* buf, int count)
{
int i;
#ifdef MROBE_100 /* does not use register addressing */
(void) location;
#else
sw_i2c_start();
sw_i2c_outb((chip & 0xfe) | SW_I2C_WRITE);
if (!sw_i2c_getack())
{
sw_i2c_stop();
return -1;
}
sw_i2c_outb(location);
if (!sw_i2c_getack())
{
sw_i2c_stop();
return -2;
}
#endif
sw_i2c_start();
sw_i2c_outb((chip & 0xfe) | SW_I2C_READ);
if (!sw_i2c_getack())
{
sw_i2c_stop();
return -3;
}
for (i=0; i<count-1; i++)
{
buf[i] = sw_i2c_inb();
sw_i2c_ack();
}
/* 1byte min */
buf[i] = sw_i2c_inb();
sw_i2c_nack();
sw_i2c_stop();
return 0;
}
/*---------------------------------------------------------------------------*/
u08 EEPROM_CurrentAddressRead(void)
// Description:
// Current Address Read Operation. Data is read from the EEPROM. The current
// address from the EEPROM is used.
{
u08 data_in;
#if (defined I2C_SW && I2C_SW == 1)
sw_i2c_start(); // Send start signal
sw_i2c_write(EEPROMAddress);// Send identifer I2C address (10100000b)
sw_i2c_start(); // Send I2C Start Transfer
sw_i2c_write(EEPROMAddress + 1);// Send identifer I2C address (10100001b)
data_in = sw_i2c_read(0);// Read byte
sw_i2c_stop(); // Send I2C Stop Transfer
#else
IIC_recebe(EEPROMAddress, &data_in);
#endif
return data_in;
}
/*---------------------------------------------------------------------------*/
void RTC_AckPolling(void)
// Description:
// Acknowledge Polling. The RTC will not acknowledge if a write cycle is
// in progress. It can be used to determine when a write cycle is completed.
{
volatile INT32U count = 0x03FF, ack = 0;
while ((count != 0))
{
count--;
sw_i2c_start();
if (sw_i2c_write(DS1307Address))
count = 0;
sw_i2c_stop();
}
}
/*---------------------------------------------------------------------------*/
void EEPROM_AckPolling(void)
// Description:
// Acknowledge Polling. The EEPROM will not acknowledge if a write cycle is
// in progress. It can be used to determine when a write cycle is completed.
{
volatile unsigned int count = 0x03FF, ack = 0;
while ((count != 0))
{
count--;
sw_i2c_start();
if (sw_i2c_write(EEPROMAddress))
count = 0;
sw_i2c_stop();
}
}
INT8U RTC_DS1307_Init(void)
{
#if (defined I2C_SW && I2C_SW == 1)
INT8U ret = NO_I2C_ACK;
CRITICAL_SECTION_START();
sw_i2c_init();
CRITICAL_SECTION_END();
sw_i2c_start(); // Send start signal
ret = sw_i2c_write(DS1307Address); // Send identifer I2C address (10100000b)
delay_time(I2C_DELAY);
sw_i2c_stop();
return ((ret == OK_I2C_ACK) ? TRUE : FALSE);
#else
IIC_init();
#endif
}
/*---------------------------------------------------------------------------*/
INT8U RTC_CurrentAddressRead(void)
// Description:
// Current Address Read Operation. Data is read from the RTC. The current
// address from the RTC is used.
{
INT8U data_in;
#if (defined I2C_SW && I2C_SW == 1)
CRITICAL_SECTION_START();
sw_i2c_start(); // Send I2C Start Transfer
sw_i2c_write(DS1307Address | 1); // Send identifer I2C address (10100001b)
data_in = sw_i2c_read(0); // Read byte
sw_i2c_stop(); // Send I2C Stop Transfer
CRITICAL_SECTION_END();
#else
IIC_recebe(DS1307Address, &data_in);
#endif
return data_in;
}
void RTC_ByteWrite(INT8U Address, INT8U Data)
// Description:
// Byte Write Operation. The communication via the I2C bus with an EEPROM
// (2465) is realized. A data byte is written into a user defined address.
{
#if (defined I2C_SW && I2C_SW == 1)
CRITICAL_SECTION_START();
sw_i2c_start(); // Send start signal
sw_i2c_write(DS1307Address & 0b11111110);// Send identifier I2C address 0xA0 = 10100000b
delay_time(I2C_DELAY);
sw_i2c_write((INT8U) Address);// Send address to RTC (byte address)
delay_time(I2C_DELAY);
sw_i2c_write(Data); // Send low byte to RTC (data to write)
delay_time(I2C_DELAY); // Delay a period of time to write
sw_i2c_stop(); // Send I2C Stop Transfer
delay_time(20); // Delay a period of time to write
CRITICAL_SECTION_END();
#else
IIC_transmite(DS1307Address, Address, &Data);
#endif
}
int sw_i2c_write(unsigned char chip, unsigned char location, unsigned char* buf, int count)
{
int i;
sw_i2c_start();
sw_i2c_outb((chip & 0xfe) | SW_I2C_WRITE);
if (!sw_i2c_getack())
{
sw_i2c_stop();
return -1;
}
#ifdef MROBE_100 /* does not use register addressing */
(void) location;
#else
sw_i2c_outb(location);
if (!sw_i2c_getack())
{
sw_i2c_stop();
return -2;
}
#endif
for (i=0; i<count; i++)
{
sw_i2c_outb(buf[i]);
if (!sw_i2c_getack())
{
sw_i2c_stop();
return -3;
}
}
sw_i2c_stop();
return 0;
}
