/*
** Receives data over I2C bus
*/
void SetupI2CReception(int count)
{
I2CSetDataCount(SOC_I2C_0_REGS, count);
I2CMasterControl(SOC_I2C_0_REGS, I2C_CFG_MST_RX | I2C_CFG_STOP);
I2CMasterIntEnableEx(SOC_I2C_0_REGS, I2C_INT_DATA_READY
| I2C_INT_STOP_CONDITION
| I2C_INT_NO_ACK);
I2CMasterStart(SOC_I2C_0_REGS);
while(flag);
flag = 1;
}
/*
** Transmits data over I2C bus
*/
void SetupI2CTransmit2(int count)
{
I2CSetDataCount(SOC_I2C_0_REGS, count);
I2CMasterControl(SOC_I2C_0_REGS, I2C_CFG_MST_TX | I2C_CFG_STOP);
I2CMasterIntEnableEx(SOC_I2C_0_REGS, I2C_INT_TRANSMIT_READY
| I2C_INT_STOP_CONDITION
| I2C_INT_NO_ACK);
I2CMasterStart(SOC_I2C_0_REGS);
while(flag);
flag = 1;
}
/*
** Function to receive data from the Codec through I2C bus
*/
static void I2CCodecRcvBlocking(unsigned int baseAddr, unsigned int dataCnt)
{
txCompFlag = 1;
dataIdx = 0;
savedBase = baseAddr;
I2CSetDataCount(baseAddr, dataCnt);
I2CMasterControl(baseAddr, I2C_CFG_MST_RX | I2C_CFG_STOP);
I2CMasterIntEnableEx(baseAddr, I2C_INT_DATA_READY | I2C_INT_STOP_CONDITION);
I2CMasterStart(baseAddr);
/* Wait till data is received fully */
while(txCompFlag);
}
/*
** Function to send data through i2c
*/
static void I2CCodecSendBlocking(unsigned int baseAddr, unsigned int dataCnt)
{
txCompFlag = 1;
dataIdx = 0;
savedBase = baseAddr;
I2CSetDataCount(baseAddr, dataCnt);
I2CMasterControl(baseAddr, I2C_CFG_MST_TX | I2C_CFG_STOP);
I2CMasterIntEnableEx(baseAddr, I2C_INT_TRANSMIT_READY | I2C_INT_STOP_CONDITION);
I2CMasterStart(baseAddr);
/* Wait till the data is sent */
while(txCompFlag);
}
/*
Set up I2C pins and clock slow/fast
rate400 true = 400KHz, false 100KHz
*/
void MasterI2C0Init(int rate400)
{
//I2CMasterEnable(I2C0_MASTER_BASE); // causes fault
//
// Enable the I2C and GPIO port B blocks as they are needed by this driver.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
//Setup Mux
GPIOPinConfigure(GPIO_PB2_I2C0SCL);
GPIOPinConfigure(GPIO_PB3_I2C0SDA);
GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_2 | GPIO_PIN_3); //Set up direction
//Reconfigure for correct operation
GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_2, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_3, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_OD);
//
// Configure the I2C SCL and SDA pins for I2C operation.
//
//GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2);
//GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3);
//
// Initialize the I2C master.
//
I2CMasterInitExpClk(I2C0_MASTER_BASE, SysCtlClockGet(), true);
SysCtlDelay(10000); // delay mandatory here - otherwise portion of SlaveAddrSet() lost!
// Register interrupt handler
// or we could just edit the startup.c file
//I2CIntRegister(I2C0_MASTER_BASE,I2C0IntHandler);
//
// Enable the I2C interrupt.
//
IntEnable(INT_I2C0); // already done via I2CIntRegister
I2CMasterIntEnableEx(I2C0_MASTER_BASE,I2C_MASTER_INT_DATA | I2C_MASTER_INT_TIMEOUT);
//
// Enable the I2C master interrupt.
//
I2CMasterIntEnable(I2C0_MASTER_BASE);
}
/*
** Function to receive data from the Codec through I2C bus
*/
void I2C0RcvBlocking(unsigned int dataCnt)
{
txCompFlag = 1;
dataIdx = 0;
while(I2C0IsBusy());
I2CSetDataCount(SOC_I2C_0_REGS, dataCnt);
I2CMasterControl(SOC_I2C_0_REGS, I2C_CFG_MST_RX | I2C_CFG_STOP);
I2CMasterIntEnableEx(SOC_I2C_0_REGS, I2C_INT_DATA_READY
| I2C_INT_STOP_CONDITION
| I2C_INT_NO_ACK);
I2CMasterStart(SOC_I2C_0_REGS);
/* Wait till data is received fully */
while(txCompFlag);
while(I2C0IsBusy());
}
/*
** Function to send data through i2c
*/
void I2C0SendBlocking(unsigned int dataCnt)
{
txCompFlag = 1;
dataIdx = 0;
while(I2C0IsBusy());
I2CSetDataCount(SOC_I2C_0_REGS, dataCnt);
I2CMasterControl(SOC_I2C_0_REGS, I2C_CFG_MST_TX | I2C_CFG_STOP);
I2CMasterIntEnableEx(SOC_I2C_0_REGS, I2C_INT_TRANSMIT_READY
| I2C_INT_STOP_CONDITION
| I2C_INT_NO_ACK);
I2CMasterStart(SOC_I2C_0_REGS);
/* Wait till the data is sent */
while(txCompFlag);
while(I2C0IsBusy());
}
/* Clear status of all interrupts */
void CleanUpInterrupts(new_twi* TwiStruct)
{
if(TwiStruct->WithInterrupt)I2CMasterIntEnableEx(TwiStruct->BaseAddr, 0x7FF);
I2CMasterIntClearEx(TwiStruct->BaseAddr, 0x7FF);
if(TwiStruct->WithInterrupt)I2CMasterIntDisableEx(TwiStruct->BaseAddr, 0x7FF);
}
int main(void) {
SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN);
SysCtlDelay(10000);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
GPIOPinTypeI2CSCL(GPIO_PORTD_BASE, GPIO_PIN_0);
GPIOPinTypeI2C(GPIO_PORTD_BASE, GPIO_PIN_1);
GPIOPinConfigure(GPIO_PD0_I2C3SCL);
GPIOPinConfigure(GPIO_PD1_I2C3SDA);
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C3);
I2CMasterInitExpClk( I2C3_MASTER_BASE, SysCtlClockGet(), false);
SysCtlDelay(10000);
I2CMasterTimeoutSet(I2C3_MASTER_BASE, 0x7d);
I2CMasterSlaveAddrSet(I2C3_MASTER_BASE, I2C_SLAVE_ADDRESS, false);
I2CMasterIntEnableEx(I2C3_MASTER_BASE, I2C_MASTER_INT_TIMEOUT|I2C_MASTER_INT_DATA);
IntEnable(INT_I2C3);
IntMasterEnable();
while(1) {
i2c_flag=0;
//Let's send various challenges to our slave
data.op1++;
data.op2+=2;
switch(data.op1 % 4) {
case 0:
data.op = op_add;
break;
case 1:
data.op = op_mult;
break;
case 2:
data.op = op_div;
break;
case 3:
data.op = op_subst;
break;
}
what_we_re_doing = sending;
sent_bytes = 0;
//Start to send the full structure
I2CMasterSlaveAddrSet(I2C3_MASTER_BASE, I2C_SLAVE_ADDRESS, false);
I2CMasterDataPut(I2C3_MASTER_BASE, *((unsigned char *)&data));
I2CMasterControl(I2C3_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(!i2c_flag);
if (i2c_flag == 2) {
//I2C Failure
continue;
}
else if (i2c_flag == 1) {
//I2C Success
}
what_we_re_doing = receiving;
received_bytes = 0;
//Start to receive the full structure
I2CMasterSlaveAddrSet(I2C3_MASTER_BASE, I2C_SLAVE_ADDRESS, true);
I2CMasterControl(I2C3_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
while(!i2c_flag);
if (i2c_flag == 2) {
//I2C Failure
continue;
}
else if (i2c_flag == 1) {
//I2C Success
}
SysCtlDelay(SysCtlClockGet()/100);
}
}
