/**
-----------------------------------------------------------------------------------------------------------------------
eMBRTUStop
-----------------------------------------------------------------------------------------------------------------------
* Event Handler for GPI module
*
* @date DEC/02/2013
* @author FW_DEV_2
* @pre None
* @return None
************************************************************************************************************************
*/
void eMBRTUStop( void )
{
ENTER_CRITICAL_SECTION( );
vMBPortSerialEnable( FALSE, FALSE );
vMBPortTimersDisable( );
EXIT_CRITICAL_SECTION( );
}
void
eMBASCIIStop( void )
{
ENTER_CRITICAL_DECLARE( );
ENTER_CRITICAL_SECTION( );
vMBPortSerialEnable( FALSE, FALSE );
vMBPortTimersDisable( );
EXIT_CRITICAL_SECTION( );
}
/* ----------------------- Start implementation -----------------------------*/
BOOL
xMBPortTimersInit( USHORT usTim1Timerout50us )
{
/* Calculate overflow counter an OCR values for Timer1. */
usTimerOCRADelta =
( MB_TIMER_TICKS * usTim1Timerout50us ) / ( MB_50US_TICKS );
TCCR1A = 0x00;
TCCR1B = 0x00;
TCCR1C = 0x00;
vMBPortTimersDisable( );
return TRUE;
}
/**
* @brief Timer Initialize
* @param None
* @retval None
*/
BOOL
xMBPortTimersInit( USHORT usTimeOut50us )
{
/* TIMx is used as Modbus timer */
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
uint16_t PrescalerValue = 0;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIMx, ENABLE);
/* Timer Config
SystemCoreClock / (PrescalerValue + 1) = 20KHz (50us)
Timer Count Max = usTimeOut50us
*/
/* Compute the prescaler value */
PrescalerValue = (uint16_t) (SystemCoreClock / 20000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = (uint16_t) usTimeOut50us;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIMx, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIMx, ENABLE);
/**
* @brief Configure the nested vectored interrupt controller.
* @param None
* @retval None
*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/* Enable the TIMx Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIMx_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
vMBPortTimersDisable();
return TRUE;
}
BOOL
xMBASCIIReceiveFSM( void )
{
BOOL xNeedPoll = FALSE;
UCHAR ucByte;
UCHAR ucResult;
assert( eSndState == STATE_TX_IDLE );
( void )xMBPortSerialGetByte( ( CHAR * ) & ucByte );
switch ( eRcvState )
{
/* A new character is received. If the character is a ':' the input
* buffer is cleared. A CR-character signals the end of the data
* block. Other characters are part of the data block and their
* ASCII value is converted back to a binary representation.
*/
case STATE_RX_RCV:
/* Enable timer for character timeout. */
vMBPortTimersEnable( );
if( ucByte == ':' )
{
/* Empty receive buffer. */
eBytePos = BYTE_HIGH_NIBBLE;
usRcvBufferPos = 0;
}
else if( ucByte == MB_ASCII_DEFAULT_CR )
{
eRcvState = STATE_RX_WAIT_EOF;
}
else
{
ucResult = prvucMBCHAR2BIN( ucByte );
switch ( eBytePos )
{
/* High nibble of the byte comes first. We check for
* a buffer overflow here. */
case BYTE_HIGH_NIBBLE:
if( usRcvBufferPos < MB_SER_PDU_SIZE_MAX )
{
ucASCIIBuf[usRcvBufferPos] = ( UCHAR )( ucResult << 4 );
eBytePos = BYTE_LOW_NIBBLE;
break;
}
else
{
/* not handled in Modbus specification but seems
* a resonable implementation. */
eRcvState = STATE_RX_IDLE;
/* Disable previously activated timer because of error state. */
vMBPortTimersDisable( );
}
break;
case BYTE_LOW_NIBBLE:
ucASCIIBuf[usRcvBufferPos] |= ucResult;
usRcvBufferPos++;
eBytePos = BYTE_HIGH_NIBBLE;
break;
}
}
break;
case STATE_RX_WAIT_EOF:
if( ucByte == ucMBLFCharacter )
{
/* Disable character timeout timer because all characters are
* received. */
vMBPortTimersDisable( );
/* Receiver is again in idle state. */
eRcvState = STATE_RX_IDLE;
/* Notify the caller of eMBASCIIReceive that a new frame
* was received. */
xNeedPoll = xMBPortEventPost( EV_FRAME_RECEIVED );
}
else if( ucByte == ':' )
{
/* Empty receive buffer and back to receive state. */
eBytePos = BYTE_HIGH_NIBBLE;
usRcvBufferPos = 0;
eRcvState = STATE_RX_RCV;
/* Enable timer for character timeout. */
vMBPortTimersEnable( );
}
else
{
/* Frame is not okay. Delete entire frame. */
eRcvState = STATE_RX_IDLE;
}
break;
case STATE_RX_IDLE:
if( ucByte == ':' )
{
/* Enable timer for character timeout. */
vMBPortTimersEnable( );
/* Reset the input buffers to store the frame. */
usRcvBufferPos = 0;;
eBytePos = BYTE_HIGH_NIBBLE;
eRcvState = STATE_RX_RCV;
}
break;
}
return xNeedPoll;
}