void
vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable )
{
if( xRxEnable )
UART_ItConfig( MB_UART_DEV, UART_RxBufFull, ENABLE );
else
UART_ItConfig( MB_UART_DEV, UART_RxBufFull, DISABLE );
if( xTxEnable )
UART_ItConfig( MB_UART_DEV, UART_TxHalfEmpty, ENABLE );
else
UART_ItConfig( MB_UART_DEV, UART_TxHalfEmpty, DISABLE );
}
u32_t
sio_write( sio_fd_t fd, u8_t * buf, u32_t size )
{
u32_t ch_left;
volatile serdev_t *dev = fd;
if( dev->ready )
{
ch_left = size;
while( ch_left > 0 )
{
vPortEnterCritical( );
while( ( dev->tx_buf_cnt < DEFAULT_TX_BUFSIZE ) && ( ch_left > 0 ) )
{
dev->tx_buf[dev->tx_buf_wrpos] = *buf++;
dev->tx_buf_wrpos = ( dev->tx_buf_wrpos + 1 ) % DEFAULT_TX_BUFSIZE;
dev->tx_buf_cnt++;
ch_left--;
}
/* Enable transmit FIFO empty interrupts and block. */
UART_ItConfig( dev->UARTx, UART_TxHalfEmpty, ENABLE );
vPortExitCritical( );
/* Not all characters sent within one write. Block on a semaphore
* which is triggered when the buffer is empty again.
*/
if( ch_left != 0 )
{
while( xSemaphoreTake( dev->tx_sem, portMAX_DELAY ) != pdTRUE );
}
}
}
return size;
}
/*
* See the serial2.h header file.
*/
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
xComPortHandle xReturn;
/* Create the queues used to hold Rx and Tx characters. */
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
/* If the queues were created correctly then setup the serial port
hardware. */
if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
{
portENTER_CRITICAL();
{
/* Setup the UART port pins. */
GPIO_Config( GPIO0, UART0_Tx_Pin, GPIO_AF_PP );
GPIO_Config( GPIO0, UART0_Rx_Pin, GPIO_IN_TRI_CMOS );
/* Configure the UART. */
UART_OnOffConfig( UART0, ENABLE );
UART_FifoConfig( UART0, DISABLE );
UART_FifoReset( UART0, UART_RxFIFO );
UART_FifoReset( UART0, UART_TxFIFO );
UART_LoopBackConfig(UART0, DISABLE );
UART_Config( UART0, ulWantedBaud, UART_NO_PARITY, UART_1_StopBits, UARTM_8D );
UART_RxConfig( UART0, ENABLE );
/* Configure the IEC for the UART interrupts. */
EIC_IRQChannelPriorityConfig( UART0_IRQChannel, 1 );
EIC_IRQChannelConfig( UART0_IRQChannel, ENABLE );
EIC_IRQConfig( ENABLE );
UART_ItConfig( UART0, UART_RxBufFull, ENABLE );
}
portEXIT_CRITICAL();
}
else
{
xReturn = ( xComPortHandle ) 0;
}
/* This demo file only supports a single port but we have to return
something to comply with the standard demo header file. */
return xReturn;
}
void
sio_serial_isr( UART_TypeDef * UARTx, u8_t * need_ctx_switch )
{
int i;
u16 status;
volatile serdev_t *dev = SIO_FD_NULL;
portBASE_TYPE rx_woken = pdFALSE;
portBASE_TYPE tx_woken = pdFALSE;
for( i = 0; i < UART_DEVICES_MAX; i++ )
{
if( devices[i].ready && ( devices[i].UARTx == UARTx ) )
{
dev = &devices[i];
break;
}
}
if( dev != SIO_FD_NULL )
{
status = UART_FlagStatus( dev->UARTx );
/* If there are characters in the UART fifo place them into the
* ring buffer. In case the buffer is filled half or the requested
* number of bytes has been read wakeup the receiver.
*/
if( status & UART_RxBufFull )
{
do
{
/* Store the character in the ring buffer and advance write
* position. */
dev->rx_buf[dev->rx_buf_wrpos] = dev->UARTx->RxBUFR;
dev->rx_buf_wrpos = ( dev->rx_buf_wrpos + 1 ) % DEFAULT_RX_BUFSIZE;
/* Increment the receiver buffer counter. Check for a buffer
* overrun. In that case we have overwritten a old character.
* Therefore we have to advance the read position. Note that
* in this error case we must not increment the read counter
* because an old character was lost.
*/
if( dev->rx_buf_cnt >= DEFAULT_RX_BUFSIZE )
{
/* LWIP_ASSERT( "sio_serial_isr: receiver buffer overflow", 0 ); */
dev->rx_buf_rdpos = ( dev->rx_buf_rdpos + 1 ) % DEFAULT_RX_BUFSIZE;
}
else
{
dev->rx_buf_cnt++;
}
/* Get the new status from the UART. */
status = UART_FlagStatus( dev->UARTx );
}
while( status & UART_RxBufFull );
/* Wakeup receiver if buffer is starting to fill. */
if( dev->rx_buf_cnt > ( DEFAULT_RX_BUFSIZE / 2 ) )
{
rx_woken = xSemaphoreGiveFromISR( dev->rx_sem, rx_woken );
}
}
/* Check if we must send characters. */
if( ( dev->tx_buf_cnt > 0 ) && ( status & UART_TxHalfEmpty ) )
{
do
{
/* Fetch character from the ring buffer and place them into
* the FIFO. */
dev->UARTx->TxBUFR = dev->tx_buf[dev->tx_buf_rdpos];
dev->tx_buf_rdpos = ( dev->tx_buf_rdpos + 1 ) % DEFAULT_TX_BUFSIZE;
dev->tx_buf_cnt--;
/* Get the new status from the UART. */
status = UART_FlagStatus( dev->UARTx );
}
while( ( dev->tx_buf_cnt > 0 ) && ( status & UART_TxHalfEmpty ) );
if( dev->tx_buf_cnt == 0 )
{
tx_woken = xSemaphoreGiveFromISR( dev->tx_sem, tx_woken );
UART_ItConfig( dev->UARTx, UART_TxHalfEmpty, DISABLE );
}
}
if( tx_woken || rx_woken )
{
*need_ctx_switch = 1;
}
}
}
sio_fd_t
sio_open_new( u8_t devnr, u32_t baudrate, u8_t databits, sio_stop_t stopbits, sio_parity_t parity )
{
int i;
err_t error = ERR_OK;
serdev_t *dev;
UARTParity_TypeDef eUARTParity = UART_NO_PARITY;
UARTMode_TypeDef eUARTMode = UARTM_8D;
UARTStopBits_TypeDef eUARTStopBits;
if( !initialized )
{
for( i = 0; i < UART_DEVICES_MAX; i++ )
{
SIO_RESET_STATE( &devices[i] );
}
initialized = 1;
}
/* Check if devicename is valid and not in use. */
if( ( devnr < UART_DEVICES_MAX ) && ( devices[devnr].ready == 0 ) )
{
dev = ( serdev_t * ) & devices[devnr];
switch ( parity )
{
case SIO_PAR_EVEN:
eUARTParity = UART_EVEN_PARITY;
break;
case SIO_PAR_ODD:
eUARTParity = UART_ODD_PARITY;
break;
case SIO_PAR_NONE:
eUARTParity = UART_NO_PARITY;
break;
default:
error = ERR_VAL;
}
switch ( databits )
{
case 7:
if( parity != SIO_PAR_NONE )
{
eUARTMode = UARTM_7D_P;
}
break;
case 8:
eUARTMode = parity == SIO_PAR_NONE ? UARTM_8D : UARTM_8D_P;
break;
default:
error = ERR_VAL;
}
switch ( stopbits )
{
case SIO_STOP_0_5:
eUARTStopBits = UART_0_5_StopBits;
break;
case SIO_STOP_1:
eUARTStopBits = UART_1_StopBits;
break;
case SIO_STOP_1_5:
eUARTStopBits = UART_1_5_StopBits;
break;
case SIO_STOP_2:
eUARTStopBits = UART_2_StopBits;
break;
default:
error = ERR_VAL;
}
if( error == ERR_OK )
{
SIO_RESET_STATE( dev );
vSemaphoreCreateBinary( dev->rx_sem );
vSemaphoreCreateBinary( dev->tx_sem );
vPortEnterCritical( );
if( ( error = sio_open_low_level( devnr, dev ) ) != ERR_OK )
{
/* Hardware interface does not exist. */
}
else if( dev->tx_sem == ( xSemaphoreHandle ) 0 )
{
error = ERR_MEM;
}
else if( dev->rx_sem == ( xSemaphoreHandle ) 0 )
{
error = ERR_MEM;
}
else
{
/* UART parameter correct and hardware device available. */
UART_OnOffConfig( dev->UARTx, ENABLE );
UART_FifoConfig( dev->UARTx, ENABLE );
UART_FifoReset( dev->UARTx, UART_RxFIFO );
UART_FifoReset( dev->UARTx, UART_TxFIFO );
UART_LoopBackConfig( dev->UARTx, DISABLE );
UART_Config( dev->UARTx, baudrate, eUARTParity, eUARTStopBits, eUARTMode );
UART_TimeOutPeriodConfig( dev->UARTx, 0xFF );
UART_ItConfig( dev->UARTx, UART_RxBufFull, ENABLE );
UART_RxConfig( dev->UARTx, ENABLE );
/* Device is now ready for use. */
dev->ready = 1;
}
if( error != ERR_OK )
{
sio_close( dev );
}
vPortExitCritical( );
}
}
else
{
error = ERR_VAL;
}
return error == ERR_OK ? ( void * )dev : SIO_FD_NULL;
}
