void ResetI2C(void){
int i=0;
int j=0;
I2CEnable(I2C1, FALSE);
TRISBSET = 0x0200;
if(PORTDbits.RD9==0){
sprintf(NU32_RS232OutBuffer,"Bus is low...\r\n");
WriteString(UART2,NU32_RS232OutBuffer);
}
TRISDCLR = 0x0400;
while(PORTDbits.RD9==0){
LATDbits.LATD10=!LATDbits.LATD10;
sprintf(NU32_RS232OutBuffer,"Pulsing SCK...\r\n");
WriteString(UART2,NU32_RS232OutBuffer);
ShortDelay(400000);
}
sprintf(NU32_RS232OutBuffer,"SDA high...\r\n");
WriteString(UART2,NU32_RS232OutBuffer);
TRISDSET = 0x0400;
ShortDelay(10000);
I2CEnable(I2C1, TRUE);
ShortDelay(50000);
I2Cstopevent();
}
/**
* \brief manages reference count on given bus and releases resource if no more refences exist
*
* \param[in] hal_data - opaque pointer to hal data structure - known only to the HAL implementation
*
* \return ATCA_STATUS
*/
ATCA_STATUS hal_i2c_release(void *hal_data)
{
ATCAI2CMaster_t *hal = (ATCAI2CMaster_t*)hal_data;
i2c_bus_ref_ct--; // track total i2c bus interface instances for consistency checking and debugging
// if the use count for this bus has gone to 0 references, disable it. protect against an unbracketed release
if (hal && --(hal->ref_ct) <= 0 && i2c_hal_data[hal->bus_index] != NULL)
{
I2CEnable(hal->id, FALSE);
free(i2c_hal_data[hal->bus_index]);
i2c_hal_data[hal->bus_index] = NULL;
}
return ATCA_SUCCESS;
}
//*****************************************************************************
//
//! \brief xi2c 001 test execute main body.
//!
//! \return None.
//
//*****************************************************************************
static void xI2C001Execute(void)
{
I2CMasterInit(ulMaster, 400000);
I2CEnable(ulMaster);
I2CMasterWriteS1(ulMaster, 0x12, 'a', xfalse);
I2CMasterWriteS2(ulMaster, 'b', xfalse);
I2CMasterWriteS2(ulMaster, 'c', xfalse);
I2CMasterWriteS2(ulMaster, 'd', xfalse);
I2CMasterReadBufS1(ulMaster, 0x12, ucTemp, 5, xtrue);
TestAssert(ucTemp[0] == 'a',
"xi2c, \"I2C send or receive\" error!");
TestAssert(ucTemp[1] == 'b',
"xi2c, \"I2C send or receive\" error!");
TestAssert(ucTemp[2] == 'c',
"xi2c, \"I2C send or receive\" error!");
TestAssert(ucTemp[3] == 'd',
"xi2c, \"I2C send or receive\" error!");
}
void I2C1update(void) {
if (I2C1STAT & 0x0400) {
// bus collision
i2c1Mode = I2C1_MODE_ERROR;
i2c1BusState = I2C1_BUS_ERROR;
I2CEnable(I2C1, FALSE);
}
if (i2c1Delay) {
i2c1Delay--;
return;
}
if (i2c1Mode == I2C1_MODE_IDLE) {
if (i2c1QueueRd != i2c1QueueWr) {
// show that I2C1 is busy
i2c1Mode = I2C1_MODE_WRITE;
// clear the write and read indices
i2c1Queue[i2c1QueueRd].wi = 0;
i2c1Queue[i2c1QueueRd].ri = 0;
// start I2C1 transfer
i2c1BusState = I2C1_BUS_WR_DATA;
I2C1CONSET = _I2CCON_SEN_MASK;
}
} // I2C1_IDLE
else if (i2c1Mode == I2C1_MODE_WRITE_COMPLETE) {
I2C1process();
i2c1QueueRd++;
if (i2c1QueueRd >= I2C1_QUEUE_SIZE) {
i2c1QueueRd = 0;
}
i2c1Mode = I2C1_MODE_IDLE;
} // I2C1_WRITE_COMPLETE
else if (i2c1Mode == I2C1_MODE_READ_COMPLETE) {
I2C1process();
i2c1QueueRd++;
if (i2c1QueueRd >= I2C1_QUEUE_SIZE) {
i2c1QueueRd = 0;
}
i2c1Mode = I2C1_MODE_IDLE;
} // I2C1_READ_COMPLETE
else if (i2c1Mode == I2C1_MODE_ERROR) {
// usually caused is SDA is low before start
if (!(PORTA & PA_SCL1)) {
// is clock is low, raise it
PORTSetPinsDigitalOut(IOPORT_A, PA_SCL1);
PORTSetBits(IOPORT_A, PA_SCL1);
}
else {
if (!(PORTA & PA_SDA1)) {
// if SDA is still low, try another clock pulse
PORTSetPinsDigitalOut(IOPORT_A, PA_SCL1);
PORTClearBits(IOPORT_A, PA_SCL1);
}
else {
// SDA is now high, try clearing the error
PORTSetPinsDigitalOut(IOPORT_A, PA_SDA1);
PORTClearBits(IOPORT_A, PA_SDA1);
i2c1Mode = I2C1_MODE_ERR_START;
}
}
}
else if (i2c1Mode == I2C1_MODE_ERR_START) {
PORTSetBits(IOPORT_A, PA_SDA1);
i2c1Mode = I2C1_MODE_ERR_STOP;
}
else if (i2c1Mode == I2C1_MODE_ERR_STOP) {
I2C1STAT &= ~0x400;
IFS0 &= ~0x20000000;
PORTSetPinsDigitalIn(IOPORT_A, PA_SCL1 | PA_SDA1);
I2CEnable(I2C1, TRUE);
i2c1Mode = I2C1_MODE_IDLE;
}
} // I2C1update()
int main(void)
{
UINT8 i2cData[10];
I2C_7_BIT_ADDRESS SlaveAddress;
int Index;
int DataSz;
UINT32 actualClock;
BOOL Acknowledged;
BOOL Success = TRUE;
UINT8 i2cbyte;
// Initialize debug messages (when supported)
DBINIT();
// Set the I2C baudrate
actualClock = I2CSetFrequency(EEPROM_I2C_BUS, GetPeripheralClock(), I2C_CLOCK_FREQ);
if ( abs(actualClock-I2C_CLOCK_FREQ) > I2C_CLOCK_FREQ/10 )
{
DBPRINTF("Error: I2C1 clock frequency (%u) error exceeds 10%%.\n", (unsigned)actualClock);
}
// Enable the I2C bus
I2CEnable(EEPROM_I2C_BUS, TRUE);
//
// Send the data to EEPROM to program one location
//
// Initialize the data buffer
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, EEPROM_ADDRESS, I2C_WRITE);
i2cData[0] = SlaveAddress.byte;
i2cData[1] = 0x05; // EEPROM location to program (high address byte)
i2cData[2] = 0x40; // EEPROM location to program (low address byte)
i2cData[3] = 0xAA; // Data to write
DataSz = 4;
// Start the transfer to write data to the EEPROM
if( !StartTransfer(FALSE) )
{
while(1);
}
// Transmit all data
Index = 0;
while( Success && (Index < DataSz) )
{
// Transmit a byte
if (TransmitOneByte(i2cData[Index]))
{
// Advance to the next byte
Index++;
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(EEPROM_I2C_BUS))
{
DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
}
}
else
{
Success = FALSE;
}
}
// End the transfer (hang here if an error occured)
StopTransfer();
if(!Success)
{
while(1);
}
// Wait for EEPROM to complete write process, by polling the ack status.
Acknowledged = FALSE;
do
{
// Start the transfer to address the EEPROM
if( !StartTransfer(FALSE) )
{
while(1);
}
// Transmit just the EEPROM's address
if (TransmitOneByte(SlaveAddress.byte))
{
// Check to see if the byte was acknowledged
Acknowledged = I2CByteWasAcknowledged(EEPROM_I2C_BUS);
}
else
{
Success = FALSE;
}
// End the transfer (stop here if an error occured)
StopTransfer();
if(!Success)
{
while(1);
}
} while (Acknowledged != TRUE);
//
// Read the data back from the EEPROM.
//
// Initialize the data buffer
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, EEPROM_ADDRESS, I2C_WRITE);
i2cData[0] = SlaveAddress.byte;
i2cData[1] = 0x05; // EEPROM location to read (high address byte)
i2cData[2] = 0x40; // EEPROM location to read (low address byte)
DataSz = 3;
// Start the transfer to read the EEPROM.
if( !StartTransfer(FALSE) )
{
while(1);
}
// Address the EEPROM.
Index = 0;
while( Success & (Index < DataSz) )
{
// Transmit a byte
if (TransmitOneByte(i2cData[Index]))
{
// Advance to the next byte
Index++;
}
else
{
Success = FALSE;
}
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(EEPROM_I2C_BUS))
{
DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
}
}
// Restart and send the EEPROM's internal address to switch to a read transfer
if(Success)
{
// Send a Repeated Started condition
if( !StartTransfer(TRUE) )
{
while(1);
}
// Transmit the address with the READ bit set
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, EEPROM_ADDRESS, I2C_READ);
if (TransmitOneByte(SlaveAddress.byte))
{
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(EEPROM_I2C_BUS))
{
DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
}
}
else
{
Success = FALSE;
}
}
// Read the data from the desired address
if(Success)
{
if(I2CReceiverEnable(EEPROM_I2C_BUS, TRUE) == I2C_RECEIVE_OVERFLOW)
{
DBPRINTF("Error: I2C Receive Overflow\n");
Success = FALSE;
}
else
{
while(!I2CReceivedDataIsAvailable(EEPROM_I2C_BUS));
i2cbyte = I2CGetByte(EEPROM_I2C_BUS);
}
}
// End the transfer (stop here if an error occured)
StopTransfer();
if(!Success)
{
while(1);
}
// Validate the data read
if( i2cbyte != 0xAA )
{
DBPRINTF("Error: Verify failed\n");
}
else
{
DBPRINTF("Success\n");
}
// Example complete
while(1);
}
//the next few functions are general for i2c
//all these functions were stolen from Kralick_Lab4
void initI2CBus(I2C_MODULE id, int pBusFrq, int i2cFrq){
I2CConfigure(id, 0);
I2CSetFrequency(id, pBusFrq, i2cFrq);
I2CEnable(id, TRUE);
}
//Turn on I2C Module and calibrate for standard operation.
void I2Cinitialize(void){
I2CSetFrequency(I2C1, SYS_FREQ, I2C_CLOCK_FREQ);
I2CEnable(I2C1, TRUE);
}
