status_t I2C_MasterTransferBlocking(I2C_Type *base, i2c_master_transfer_t *xfer)
{
status_t result = kStatus_Success;
uint32_t subaddress;
uint8_t subaddrBuf[4];
int i;
assert(xfer);
/* If repeated start is requested, send repeated start. */
if (!(xfer->flags & kI2C_TransferNoStartFlag))
{
if (xfer->subaddressSize)
{
result = I2C_MasterStart(base, xfer->slaveAddress, kI2C_Write);
if (result == kStatus_Success)
{
/* Prepare subaddress transmit buffer, most significant byte is stored at the lowest address */
subaddress = xfer->subaddress;
for (i = xfer->subaddressSize - 1; i >= 0; i--)
{
subaddrBuf[i] = subaddress & 0xff;
subaddress >>= 8;
}
/* Send subaddress. */
result = I2C_MasterWriteBlocking(base, subaddrBuf, xfer->subaddressSize, kI2C_TransferNoStopFlag);
if ((result == kStatus_Success) && (xfer->direction == kI2C_Read))
{
result = I2C_MasterRepeatedStart(base, xfer->slaveAddress, xfer->direction);
}
}
}
static status_t I2C_InitTransferStateMachineEDMA(I2C_Type *base,
i2c_master_edma_handle_t *handle,
i2c_master_transfer_t *xfer)
{
assert(handle);
assert(xfer);
status_t result = kStatus_Success;
uint16_t timeout = UINT16_MAX;
if (handle->state != kIdleState)
{
return kStatus_I2C_Busy;
}
else
{
i2c_direction_t direction = xfer->direction;
/* Init the handle member. */
handle->transfer = *xfer;
/* Save total transfer size. */
handle->transferSize = xfer->dataSize;
handle->state = kTransferDataState;
/* Wait until ready to complete. */
while ((!(base->S & kI2C_TransferCompleteFlag)) && (--timeout))
{
}
/* Failed to start the transfer. */
if (timeout == 0)
{
return kStatus_I2C_Timeout;
}
/* Clear all status before transfer. */
I2C_MasterClearStatusFlags(base, kClearFlags);
/* Change to send write address when it's a read operation with command. */
if ((xfer->subaddressSize > 0) && (xfer->direction == kI2C_Read))
{
direction = kI2C_Write;
}
/* If repeated start is requested, send repeated start. */
if (handle->transfer.flags & kI2C_TransferRepeatedStartFlag)
{
result = I2C_MasterRepeatedStart(base, handle->transfer.slaveAddress, direction);
}
else /* For normal transfer, send start. */
{
result = I2C_MasterStart(base, handle->transfer.slaveAddress, direction);
}
/* Send subaddress. */
if (handle->transfer.subaddressSize)
{
do
{
/* Wait until data transfer complete. */
while (!(base->S & kI2C_IntPendingFlag))
{
}
/* Clear interrupt pending flag. */
base->S = kI2C_IntPendingFlag;
handle->transfer.subaddressSize--;
base->D = ((handle->transfer.subaddress) >> (8 * handle->transfer.subaddressSize));
/* Check if there's transfer error. */
result = I2C_CheckAndClearError(base, base->S);
if (result)
{
return result;
}
} while ((handle->transfer.subaddressSize > 0) && (result == kStatus_Success));
if (handle->transfer.direction == kI2C_Read)
{
/* Wait until data transfer complete. */
while (!(base->S & kI2C_IntPendingFlag))
{
}
/* Clear pending flag. */
base->S = kI2C_IntPendingFlag;
/* Send repeated start and slave address. */
result = I2C_MasterRepeatedStart(base, handle->transfer.slaveAddress, kI2C_Read);
}
}
if (result)
{
return result;
}
/* Wait until data transfer complete. */
while (!(base->S & kI2C_IntPendingFlag))
{
}
/* Clear pending flag. */
base->S = kI2C_IntPendingFlag;
/* Check if there's transfer error. */
result = I2C_CheckAndClearError(base, base->S);
}
return result;
}
/*!
* @brief Main function
*/
int main(void)
{
i2c_slave_config_t slaveConfig;
i2c_master_config_t masterConfig;
uint32_t sourceClock;
BOARD_InitPins();
BOARD_BootClockRUN();
BOARD_InitDebugConsole();
PRINTF("\r\nI2C example -- MasterFunctionalInterrupt_SlaveFunctionalInterrupt.\r\n");
/* Enable master and slave NVIC interrupt. */
EnableIRQ(I2C_MASTER_IRQ);
EnableIRQ(I2C_SLAVE_IRQ);
/* Set i2c slave interrupt priority higher. */
NVIC_SetPriority(I2C_SLAVE_IRQ, 0);
NVIC_SetPriority(I2C_MASTER_IRQ, 1);
/*1.Set up i2c slave first*/
/*
* slaveConfig.addressingMode = kI2C_Address7bit;
* slaveConfig.enableGeneralCall = false;
* slaveConfig.enableWakeUp = false;
* slaveConfig.enableHighDrive = false;
* slaveConfig.enableBaudRateCtl = false;
* slaveConfig.enableSlave = true;
*/
I2C_SlaveGetDefaultConfig(&slaveConfig);
slaveConfig.addressingMode = kI2C_Address7bit;
slaveConfig.slaveAddress = I2C_MASTER_SLAVE_ADDR_7BIT;
I2C_SlaveInit(EXAMPLE_I2C_SLAVE_BASEADDR, &slaveConfig);
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_slave_buff[i] = 0;
}
/*2.Set up i2c master to send data to slave*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_master_buff[i] = i;
}
PRINTF("Master will send data :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_master_buff[i]);
}
PRINTF("\r\n\r\n");
/*
* masterConfig.baudRate_Bps = 100000U;
* masterConfig.enableHighDrive = false;
* masterConfig.enableStopHold = false;
* masterConfig.glitchFilterWidth = 0U;
* masterConfig.enableMaster = true;
*/
I2C_MasterGetDefaultConfig(&masterConfig);
masterConfig.baudRate_Bps = I2C_BAUDRATE;
sourceClock = CLOCK_GetFreq(I2C_MASTER_CLK_SRC);
I2C_MasterInit(EXAMPLE_I2C_MASTER_BASEADDR, &masterConfig, sourceClock);
/* Master send address to slave. */
I2C_MasterStart(EXAMPLE_I2C_MASTER_BASEADDR, I2C_MASTER_SLAVE_ADDR_7BIT, kI2C_Write);
/* Enable module interrupt. */
I2C_EnableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_EnableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
/* Wait slave receive finished. */
while (g_slaveRxIndex < I2C_DATA_LENGTH)
{
}
/* Disable module interrupt. */
I2C_DisableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_DisableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
/* Master send stop command. */
I2C_MasterStop(EXAMPLE_I2C_MASTER_BASEADDR);
/*3.Transfer completed. Check the data.*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (g_slave_buff[i] != g_master_buff[i])
{
PRINTF("\r\nError occured in this transfer ! \r\n");
break;
}
}
PRINTF("Slave received data :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_slave_buff[i]);
}
PRINTF("\r\n\r\n");
/*4.Set up slave ready to send data to master.*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_slave_buff[i] = ~g_slave_buff[i];
}
PRINTF("This time , slave will send data: :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_slave_buff[i]);
}
PRINTF("\r\n\r\n");
/* Already setup the slave transfer ready in item 1. */
/* 5.Set up master to receive data from slave. */
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_master_buff[i] = 0;
}
/* Master send address to slave. */
I2C_MasterStart(EXAMPLE_I2C_MASTER_BASEADDR, I2C_MASTER_SLAVE_ADDR_7BIT, kI2C_Read);
/* Enable module interrupt. */
I2C_EnableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_EnableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
g_masterReadBegin = true;
/* Master put receive data in receive buffer. */
g_masterRxIndex = 0;
/* Wait master receive finished. */
while (g_masterRxIndex < I2C_DATA_LENGTH)
{
}
/* Disable module interrupt. */
I2C_DisableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_DisableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
/*6.Transfer completed. Check the data.*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (g_slave_buff[i] != g_master_buff[i])
{
PRINTF("\r\nError occured in the transfer ! \r\n");
break;
}
}
PRINTF("Master received data :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_master_buff[i]);
}
PRINTF("\r\n\r\n");
PRINTF("\r\nEnd of I2C example .\r\n");
while (1)
{
}
}
