@ -864,18 +864,137 @@ static int up_interrupt(int irq, void *context)
@@ -864,18 +864,137 @@ static int up_interrupt(int irq, void *context)
* Handle LPC43xx USART0 , 2 , 3 RS485 mode set ioctl ( TIOCSRS485 ) to enable
* and disable RS - 485 mode . This is part of the serial ioctl logic .
*
* Supported and un - supported LPC43 RS - 485 features :
*
* RS - 485 / EIA - 485 Normal Multidrop Mode ( NMM ) - - NOT suppored
*
* In this mode , an address is detected when a received byte causes the
* USART to set the parity error and generate an interrupt . When the
* parity error interrupt will be generated and the processor can decide
* whether or not to disable the receiver .
*
* RS - 485 / EIA - 485 Auto Address Detection ( AAD ) mode - - NOT supported
*
* In this mode , the receiver will compare any address byte received
* ( parity = ‘ 1 ’ ) to the 8 - bit value programmed into the RS485ADRMATCH
* register . When a matching address character is detected it will be
* pushed onto the RXFIFO along with the parity bit , and the receiver
* will be automatically enabled .
*
* When an address byte which does not match the RS485ADRMATCH value
* is received , the receiver will be automatically disabled in hardware .
*
* RS - 485 / EIA - 485 Auto Direction Control - - Supported
*
* Allow the transmitter to automatically control the state of the DIR
* pin as a direction control output signal . The DIR pin will be asserted
* ( driven LOW ) when the CPU writes data into the TXFIFO . The pin will be
* de - asserted ( driven HIGH ) once the last bit of data has been transmitted .
*
* RS485 / EIA - 485 driver delay time - - Supported
*
* The driver delay time is the delay between the last stop bit leaving
* the TXFIFO and the de - assertion of the DIR pin . This delay time can be
* programmed in the 8 - bit RS485DLY register . The delay time is in periods
* of the baud clock .
*
* RS485 / EIA - 485 output inversion - - Supported
*
* The polarity of the direction control signal on the DIR pin can be
* reversed by programming bit 5 in the RS485CTRL register .
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
# ifdef CONFIG_USART_RS485MODE
# ifdef HAVE_RS485
static inline int up_set_rs485_mode ( struct up_dev_s * priv ,
const struct serial_rs485 * mode )
{
irqstate_t flags ;
uint32_t regval ;
uint64_t tmp ;
DEBUGASSERT ( priv & & mode ) ;
flags = irqsave ( ) ;
# warning "Missing logic"
/* Are we enabling or disabling RS-485 support? */
if ( ( mode - > flags & & SER_RS485_RTS_ON_SEND ) ! = 0 )
{
/* Disable all RS-485 features */
up_serialout ( priv , LPC43_UART_RS485CTRL_OFFSET , 0 ) ;
}
else
{
/* Set the RS-485/EIA-485 Control register:
*
* NMMEN 0 = Normal Multidrop Mode ( NMM ) disabled
* RXDIS 0 = Receiver is not disabled
* AADEN 0 = Auto Address Detect ( ADD ) is disabled
* DCTRL 1 = Auto Direction Control is enabled
* OINV ? = Value control by user mode settings
*/
regval = UART_RS485CTRL_DCTRL ;
/* Logic levels are controlled by the SER_RS485_RTS_ON_SEND and
* SER_RS485_RTS_AFTER_SEND bits in the mode flags .
* SER_RS485_RTS_AFTER_SEND is ignored .
*
* By default , DIR will go logic low on send , but this can
* be inverted .
*/
if ( ( mode - > flags & & SER_RS485_RTS_ON_SEND ) ! = 0 )
{
regval | = UART_RS485CTRL_OINV ;
}
up_serialout ( priv , LPC43_UART_RS485CTRL_OFFSET , regval ) ;
/* We only have control of the delay after send. Time provided
* is in milliseconds ; this must be converted to the baud clock .
* The baud clock should be 16 times the currently selected BAUD .
*
* Eg . Given BAUD = 115 , 200 , then a delay of n milliseconds would be :
*
* 115 , 200 * n / 1000 = 11525 clocks .
*
* n = 1 : 115 ( OK )
* n = 2 : 230 ( OK )
* n > 2 : Out of range
*
* The valid range is 0 to 255 bit times .
*
* REVISIT : Is this time in bit time or in terms of the baud clock ?
* The text says either interchange - ably . Baud clock is 16 x BAUD
* and a bit time is 1 / BAUD . The value range of values 0 - 255 suggests
* BAUD bit times , not the baud clock .
*/
if ( mode - > delay_rts_after_send > 0 )
{
regval = 0 ;
}
else
{
tmp = ( ( priv - > baud < < 4 ) * mode - > delay_rts_after_send ) / 1000 ;
if ( tmp > 255 )
{
regval = 255 ;
}
else
{
regval = ( uint32_t ) tmp ;
}
}
up_serialout ( priv , LPC43_UART_RS485DLY_OFFSET , regval ) ;
}
irqrestore ( flags ) ;
return OK ;
}
# endif
@ -888,16 +1007,55 @@ static inline int up_set_rs485_mode(struct up_dev_s *priv,
@@ -888,16 +1007,55 @@ static inline int up_set_rs485_mode(struct up_dev_s *priv,
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
# ifdef CONFIG_USART_RS485MODE
# ifdef HAVE_RS485
static inline int up_get_rs485_mode ( struct up_dev_s * priv ,
struct serial_rs485 * mode )
{
irqstate_t flags ;
uint32_t regval ;
DEBUGASSERT ( priv & & mode ) ;
flags = irqsave ( ) ;
# warning "Missing logic"
/* Assume disabled */
memset ( mode , 0 , sizeof ( struct serial_rs485 ) ) ;
/* If RS-485 mode is enabled, then the DCTRL will be set in the RS485CTRL
* register .
*/
regval = up_serialin ( priv , LPC43_UART_RS485CTRL_OFFSET ) ;
if ( ( regval & UART_RS485CTRL_DCTRL ) ! = 0 )
{
/* RS-485 mode is enabled */
mode - > flags = SER_RS485_ENABLED ;
/* Check if DIR is inverted */
if ( ( regval & UART_RS485CTRL_OINV ) ! = 0 )
{
mode - > flags = ( SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND ) ;
}
else
{
mode - > flags = SER_RS485_ENABLED ;
}
/* We only have control of the delay after send. Time must be
* returned in milliseconds ; this must be converted from the baud clock .
* ( The baud clock should be 16 times the currently selected BAUD . )
*
* msec = 1000 * dly / baud
*/
regval = up_serialin ( priv , LPC43_UART_RS485DLY_OFFSET ) ;
mode - > delay_rts_after_send = ( 1000 * regval ) / priv - > baud ;
}
irqrestore ( flags ) ;
return OK ;
}
# endif
@ -950,7 +1108,7 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
@@ -950,7 +1108,7 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
}
break ;
# ifdef CONFIG_USART_RS485MODE
# ifdef HAVE_RS485
case TIOCSRS485 : /* Set RS485 mode, arg: pointer to struct serial_rs485 */
{
ret = up_set_rs485_mode ( priv ,
@ -1016,6 +1174,7 @@ static void up_rxint(struct uart_dev_s *dev, bool enable)
@@ -1016,6 +1174,7 @@ static void up_rxint(struct uart_dev_s *dev, bool enable)
{
priv - > ier & = ~ UART_IER_RBRIE ;
}
up_serialout ( priv , LPC43_UART_IER_OFFSET , priv - > ier ) ;
}
patacongo
13 years ago