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EFM32: Add a LEUART-based serial driver (untestee)

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This commit is contained in:
Gregory Nutt
2014-10-21 09:21:03 -06:00
parent 2be00bbde2
commit d9abc779fe
3 changed files with 924 additions and 24 deletions
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arch/arm/src/efm32/Make.defs
+13 -1
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@@ -95,12 +95,24 @@ CHIP_ASRCS += efm32_vectors.S
endif
CHIP_CSRCS = efm32_start.c efm32_clockconfig.c efm32_irq.c efm32_timerisr.c
CHIP_CSRCS += efm32_gpio.c efm32_lowputc.c efm32_serial.c
CHIP_CSRCS += efm32_gpio.c efm32_lowputc.c
ifneq ($(CONFIG_ARCH_IDLE_CUSTOM),y)
CHIP_CSRCS += efm32_idle.c
endif
ifeq ($(CONFIG_EFM32_USART),y)
CHIP_CSRCS += efm32_serial.c
else
ifeq ($(CONFIG_EFM32_UART),y)
CHIP_CSRCS += efm32_serial.c
endif
endif
ifeq ($(CONFIG_EFM32_LEART),y)
CHIP_CSRCS += efm32_leserial.c
endif
ifeq ($(CONFIG_EFM32_GPIO_IRQ),y)
CHIP_CSRCS += efm32_gpioirq.c
endif
arch/arm/src/efm32/efm32_leserial.c
+889
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File diff suppressed because it is too large Load Diff
arch/arm/src/efm32/efm32_serial.c
+22 -23
View File
@@ -77,7 +77,7 @@
#ifdef USE_SERIALDRIVER
/* Which UART with be tty0/console and which tty1-4? The console will always
/* Which UART with be ttyS0/console and which tty1-4? The console will always
* be ttyS0. If there is no console then will use the lowest numbered UART.
*/
@@ -740,6 +740,12 @@ static int efm32_rxinterrupt(struct uart_dev_s *dev)
intflags = efm32_serialin(priv, EFM32_USART_IF_OFFSET);
/* Clear pending interrupts by writing to the interrupt flag clear
* register.
*/
efm32_serialout(priv, EFM32_USART_IFC_OFFSET, intflags & EFM32_RX_INTS);
/* Check if the receive data is available is full (RXDATAV). */
if ((intflags & USART_IEN_RXDATAV) != 0)
@@ -765,11 +771,6 @@ static int efm32_rxinterrupt(struct uart_dev_s *dev)
}
#endif
/* Clear pending interrupts by writing to the interrupt flag clear
* register.
*/
efm32_serialout(priv, EFM32_USART_IFC_OFFSET, intflags & EFM32_RX_INTS);
return OK;
}
@@ -827,6 +828,12 @@ static int efm32_txinterrupt(struct uart_dev_s *dev)
intflags = efm32_serialin(priv, EFM32_USART_IF_OFFSET);
/* Clear pending interrupts by writing to the interrupt flag clear
* register. We won't clear RX errors until they have been reported.
*/
efm32_serialout(priv, EFM32_USART_IFC_OFFSET, intflags & EFM32_TX_INTS);
/* Check if the transmit data buffer became half full */
if ((intflags & USART_IEN_TXBL) != 0)
@@ -847,11 +854,6 @@ static int efm32_txinterrupt(struct uart_dev_s *dev)
}
#endif
/* Clear pending interrupts by writing to the interrupt flag clear
* register. We won't clear RX errors until they have been reported.
*/
efm32_serialout(priv, EFM32_USART_IFC_OFFSET, intflags & EFM32_TX_INTS);
return OK;
}
@@ -946,12 +948,8 @@ static int efm32_receive(struct uart_dev_s *dev, uint32_t *status)
/* Get error status information:
*
* FE: Framing error. To clear FE, read S1 with FE set and then read
* read UART data register (D).
* NF: Noise flag. To clear NF, read S1 and then read the UART data
* register (D).
* PF: Parity error flag. To clear PF, read S1 and then read the UART
* data register (D).
* FERR Data Framing Error
* PERR Data Parity Error
*/
rxdatax = efm32_serialin(priv, EFM32_USART_RXDATAX_OFFSET);
@@ -963,9 +961,7 @@ static int efm32_receive(struct uart_dev_s *dev, uint32_t *status)
*status = rxdatax;
}
/* Then return the actual received byte. Reading S1 then D clears all
* RX errors.
*/
/* Then return the actual received byte. */
return (int)(rxdatax & _USART_RXDATAX_RXDATA_MASK);
}
@@ -1016,7 +1012,7 @@ static bool efm32_rxavailable(struct uart_dev_s *dev)
{
struct efm32_usart_s *priv = (struct efm32_usart_s*)dev->priv;
/* Return true if the receive data is available is full (RXDATAV). */
/* Return true if the receive data is available (RXDATAV). */
return (efm32_serialin(priv, EFM32_USART_STATUS_OFFSET) & USART_STATUS_RXDATAV) != 0;
}
@@ -1108,8 +1104,7 @@ static bool efm32_txempty(struct uart_dev_s *dev)
struct efm32_usart_s *priv = (struct efm32_usart_s*)dev->priv;
/* TX Complete (TXC) is set when a transmission has completed and no more
* data is available in the transmit buffer. Cleared when data is written
* to the transmit buffer
* data is available in the transmit buffer.
*/
return (efm32_serialin(priv, EFM32_USART_STATUS_OFFSET) & USART_STATUS_TXC) != 0;
@@ -1201,6 +1196,7 @@ void up_serialinit(void)
*
****************************************************************************/
#ifndef HAVE_LEUART_CONSOLE
int up_putc(int ch)
{
#ifdef HAVE_UART_CONSOLE
@@ -1223,6 +1219,7 @@ int up_putc(int ch)
#endif
return ch;
}
#endif
#else /* USE_SERIALDRIVER */
@@ -1234,6 +1231,7 @@ int up_putc(int ch)
*
****************************************************************************/
#ifndef HAVE_LEUART_CONSOLE
int up_putc(int ch)
{
#ifdef HAVE_UART_CONSOLE
@@ -1250,5 +1248,6 @@ int up_putc(int ch)
#endif
return ch;
}
#endif
#endif /* USE_SERIALDRIVER */