/**
* @brief This function handles I2C Communication Timeout for specific usage of RXNE flag.
* @param hi2c Pointer to a I2C_HandleTypeDef structure that contains
* the configuration information for the specified I2C.
* @param Timeout Timeout duration
* @param Tickstart Tick start value
* @retval HAL status
*/
static HAL_StatusTypeDef I2C_WaitOnRXNEFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart, uint8_t prev_mode)
{
while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_RXNE) == RESET)
{
/* Check if a NACK is detected */
if (I2C_IsAcknowledgeFailed(hi2c, Timeout, Tickstart) != HAL_OK)
{
return HAL_NACK;
}
/*
* FIXME: need to re-check if what is supposed to be a RESTART is not also
* triggering a STOP along...
*/
/* Check if a STOPF is detected */
if (prev_mode != HAL_I2C_MODE_MASTER_SEL && __HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_STOPF) == SET)
{
/* Clear STOP Flag */
__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);
/* Clear Configuration Register 2 */
I2C_RESET_CR2(hi2c);
hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
hi2c->State = HAL_I2C_STATE_READY;
hi2c->Mode = HAL_I2C_MODE_NONE;
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_ERROR;
}
/* Check for the Timeout */
if ((Timeout == 0U) || ((HAL_GetTick() - Tickstart) > Timeout))
{
hi2c->ErrorCode |= HAL_I2C_ERROR_TIMEOUT;
hi2c->State = HAL_I2C_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_TIMEOUT;
}
}
return HAL_OK;
}
/**
* @brief This function handles Acknowledge failed detection during an I2C Communication.
* @param hi2c: Pointer to a I2C_HandleTypeDef structure that contains
* the configuration information for the specified I2C.
* @param Timeout: Timeout duration
* @param Tickstart: Tick start value
* @retval HAL status
*/
static HAL_StatusTypeDef I2C_IsAcknowledgeFailed(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart)
{
if(__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_AF) == SET)
{
/* Wait until STOP Flag is reset */
/* AutoEnd should be initiate after AF */
while(__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_STOPF) == RESET)
{
/* Check for the Timeout */
if(Timeout != HAL_MAX_DELAY)
{
if((Timeout == 0)||((HAL_GetTick() - Tickstart) > Timeout))
{
hi2c->State= HAL_I2C_STATE_READY;
hi2c->Mode = HAL_I2C_MODE_NONE;
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_TIMEOUT;
}
}
}
/* Clear NACKF Flag */
__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);
/* Clear STOP Flag */
__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);
/* Flush TX register */
I2C_Flush_TXDR(hi2c);
/* Clear Configuration Register 2 */
I2C_RESET_CR2(hi2c);
hi2c->ErrorCode = HAL_I2C_ERROR_AF;
hi2c->State= HAL_I2C_STATE_READY;
hi2c->Mode = HAL_I2C_MODE_NONE;
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_ERROR;
}
return HAL_OK;
}
unsigned long TWI_MasterWriteRead(new_twi* TwiStruct, unsigned int TransmitBytes, unsigned int ReceiveBytes)
{
uint32_t tickstart = 0;
I2C_HandleTypeDef *hi2c = (I2C_HandleTypeDef *)TwiStruct->udata;
/* Init tickstart for timeout management*/
tickstart = HAL_GetTick();
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, I2C_TIMEOUT_BUSY, tickstart) != HAL_OK)
{
I2C_SoftwareResetCmd(hi2c);
return HAL_TIMEOUT;
}
hi2c->State = HAL_I2C_STATE_BUSY_TX;
hi2c->Mode = HAL_I2C_MODE_MASTER;
hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
/* Prepare transfer parameters */
hi2c->pBuffPtr = TwiStruct->TxBuff;
hi2c->XferCount = TransmitBytes;
hi2c->XferISR = NULL;
/* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE */
if(hi2c->XferCount > MAX_NBYTE_SIZE)
{
hi2c->XferSize = MAX_NBYTE_SIZE;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr, hi2c->XferSize, I2C_RELOAD_MODE, I2C_GENERATE_START_WRITE);
}
else
{
if(ReceiveBytes != 0)
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr, hi2c->XferSize, I2C_SOFTEND_MODE, I2C_GENERATE_START_WRITE);
}
else
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr, hi2c->XferSize, I2C_AUTOEND_MODE, I2C_GENERATE_START_WRITE);
}
}
do
{
tickstart = HAL_GetTick();
/* Wait until TXIS flag is set */
if(I2C_WaitOnTXISFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
{
if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)
{
return HAL_ERROR;
}
else
{
return HAL_TIMEOUT;
}
}
/* Read data from RXDR */
hi2c->Instance->TXDR = (*hi2c->pBuffPtr++);
hi2c->XferCount--;
hi2c->XferSize--;
if((hi2c->XferSize == 0) && (hi2c->XferCount != 0))
{
/* Wait until TCR flag is set */
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TCR, RESET, Timeout, tickstart) != HAL_OK)
{
return HAL_TIMEOUT;
}
if(hi2c->XferCount > MAX_NBYTE_SIZE)
{
hi2c->XferSize = MAX_NBYTE_SIZE;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr, hi2c->XferSize, I2C_RELOAD_MODE, I2C_NO_STARTSTOP);
}
else
{
if(ReceiveBytes != 0)
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr, hi2c->XferSize, I2C_SOFTEND_MODE, I2C_NO_STARTSTOP);
}
else
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr, hi2c->XferSize, I2C_AUTOEND_MODE, I2C_NO_STARTSTOP);
}
}
}
}while(hi2c->XferCount > 0);
if(ReceiveBytes == 0)
{
/* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */
/* Wait until STOPF flag is reset */
if(I2C_WaitOnSTOPFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
{
if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)
{
return HAL_ERROR;
}
else
{
return HAL_TIMEOUT;
}
}
/* Clear STOP Flag */
__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);
/* Clear Configuration Register 2 */
I2C_RESET_CR2(hi2c);
hi2c->State = HAL_I2C_STATE_READY;
hi2c->Mode = HAL_I2C_MODE_NONE;
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_OK;
}
tickstart = HAL_GetTick();
/* Wait until TCR flag is set */
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TC, RESET, Timeout, tickstart) != HAL_OK)
{
return HAL_TIMEOUT;
}
hi2c->State = HAL_I2C_STATE_BUSY_RX;
hi2c->Mode = HAL_I2C_MODE_MASTER;
hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
/* Prepare transfer parameters */
hi2c->pBuffPtr = TwiStruct->RxBuff;
hi2c->XferCount = ReceiveBytes;
hi2c->XferISR = NULL;
/* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE */
if(hi2c->XferCount > MAX_NBYTE_SIZE)
{
hi2c->XferSize = MAX_NBYTE_SIZE;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr | 1, hi2c->XferSize, I2C_RELOAD_MODE, I2C_GENERATE_START_READ);
}
else
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr | 1, hi2c->XferSize, I2C_AUTOEND_MODE, I2C_GENERATE_START_READ);
}
do
{
tickstart = HAL_GetTick();
/* Wait until RXNE flag is set */
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_RXNE, RESET, Timeout, tickstart) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Read data from RXDR */
(*hi2c->pBuffPtr++) = hi2c->Instance->RXDR;
hi2c->XferSize--;
hi2c->XferCount--;
if((hi2c->XferSize == 0) && (hi2c->XferCount != 0))
{
/* Wait until TCR flag is set */
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TCR, RESET, Timeout, tickstart) != HAL_OK)
{
return HAL_TIMEOUT;
}
if(hi2c->XferCount > MAX_NBYTE_SIZE)
{
hi2c->XferSize = MAX_NBYTE_SIZE;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr | 1, hi2c->XferSize, I2C_RELOAD_MODE, I2C_NO_STARTSTOP);
}
else
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, TwiStruct->MasterSlaveAddr | 1, hi2c->XferSize, I2C_AUTOEND_MODE, I2C_NO_STARTSTOP);
}
}
}while(hi2c->XferCount > 0);
/* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */
/* Wait until STOPF flag is reset */
if(I2C_WaitOnSTOPFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
{
if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)
{
return HAL_ERROR;
}
else
{
return HAL_TIMEOUT;
}
}
/* Clear STOP Flag */
__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);
/* Clear Configuration Register 2 */
I2C_RESET_CR2(hi2c);
hi2c->State = HAL_I2C_STATE_READY;
hi2c->Mode = HAL_I2C_MODE_NONE;
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_OK;
}
/**
* @brief Receives in master mode an amount of data in blocking mode.
* @param hi2c Pointer to a I2C_HandleTypeDef structure that contains
* the configuration information for the specified I2C.
* @param DevAddress Target device address The device 7 bits address value
* in datasheet must be shifted to the left before calling the interface
* @param pData Pointer to data buffer
* @param Size Amount of data to be sent
* @param Timeout Timeout duration
* @param LastOp If set sends STOP, otherwise no STOP
* @retval HAL status
*/
HAL_StatusTypeDef HAL_I2C_Master_Receive_Custom(I2C_HandleTypeDef *hi2c,
uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout,
uint8_t LastOp)
{
uint32_t tickstart = 0U;
uint8_t prev_mode = 0;
HAL_StatusTypeDef rc;
if (hi2c->State == HAL_I2C_STATE_READY)
{
/* Process Locked */
__HAL_LOCK(hi2c);
/* Init tickstart for timeout management */
tickstart = HAL_GetTick();
prev_mode = hi2c->Mode;
if (prev_mode != HAL_I2C_MODE_MASTER_SEL)
{
if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, I2C_TIMEOUT_BUSY, tickstart) != HAL_OK)
{
return HAL_TIMEOUT;
}
}
hi2c->State = HAL_I2C_STATE_BUSY_RX;
hi2c->Mode = HAL_I2C_MODE_MASTER;
hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
/* Prepare transfer parameters */
hi2c->pBuffPtr = pData;
hi2c->XferCount = Size;
hi2c->XferISR = NULL;
/* Send Slave Address */
/* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE and generate RESTART */
if (hi2c->XferCount > MAX_NBYTE_SIZE)
{
hi2c->XferSize = MAX_NBYTE_SIZE;
I2C_TransferConfig(hi2c, DevAddress, hi2c->XferSize, I2C_RELOAD_MODE, I2C_GENERATE_START_READ);
}
else if (!LastOp)
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, DevAddress, hi2c->XferSize, I2C_SOFTEND_MODE, I2C_GENERATE_START_READ);
}
else
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, DevAddress, hi2c->XferSize, I2C_AUTOEND_MODE, I2C_GENERATE_START_READ);
}
while (hi2c->XferCount > 0U)
{
/* Wait until RXNE flag is set */
rc = I2C_WaitOnRXNEFlagUntilTimeout(hi2c, Timeout, tickstart, prev_mode);
if (rc != HAL_OK && rc != HAL_NACK)
{
if (hi2c->ErrorCode == HAL_I2C_ERROR_AF)
{
return HAL_ERROR;
}
else
{
return HAL_TIMEOUT;
}
}
/* Read data from RXDR */
(*hi2c->pBuffPtr++) = hi2c->Instance->RXDR;
hi2c->XferSize--;
hi2c->XferCount--;
if (rc == HAL_NACK)
{
break;
}
if ((hi2c->XferSize == 0U) && (hi2c->XferCount != 0U))
{
/* Wait until TCR flag is set */
if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TCR, RESET, Timeout, tickstart) != HAL_OK)
{
return HAL_TIMEOUT;
}
if (hi2c->XferCount > MAX_NBYTE_SIZE)
{
hi2c->XferSize = MAX_NBYTE_SIZE;
I2C_TransferConfig(hi2c, DevAddress, hi2c->XferSize, I2C_RELOAD_MODE, I2C_NO_STARTSTOP);
}
else if (!LastOp)
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, DevAddress, hi2c->XferSize, I2C_SOFTEND_MODE, I2C_NO_STARTSTOP);
}
else
{
hi2c->XferSize = hi2c->XferCount;
I2C_TransferConfig(hi2c, DevAddress, hi2c->XferSize, I2C_AUTOEND_MODE, I2C_NO_STARTSTOP);
}
}
}
if (LastOp)
{
/* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */
/* Wait until STOPF flag is set */
if (I2C_WaitOnSTOPFlagUntilTimeout(hi2c, Timeout, tickstart) != HAL_OK)
{
if (hi2c->ErrorCode == HAL_I2C_ERROR_AF)
{
return HAL_ERROR;
}
else
{
return HAL_TIMEOUT;
}
}
/* Clear STOP Flag */
__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);
}
else
{
/* No autoend/reload was requested, make sure transmission of last byte
* has finished... */
if (I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TC, SET, Timeout, tickstart) != HAL_OK)
{
return HAL_TIMEOUT;
}
}
/* Clear Configuration Register 2 */
I2C_RESET_CR2(hi2c);
hi2c->State = HAL_I2C_STATE_READY;
if (LastOp)
{
hi2c->Mode = HAL_I2C_MODE_NONE;
}
else
{
hi2c->Mode = HAL_I2C_MODE_MASTER_SEL;
}
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}