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arch/arm/kinetis: Add option to use RTS as RS-485 transmit enable

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Support RS-485 on UART peripheral.

Signed-off-by: Jiri Vlasak <jiri.vlasak@posteo.net>
This commit is contained in:
Miloš Pokorný
2025-08-08 14:01:35 +02:00
committed by simbit18
parent ddad4fa16e
commit b404e30332
4 changed files with 126 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm/src/kinetis/Kconfig
+52
View File
@@ -1396,6 +1396,58 @@ config KINETIS_SERIAL_RXDMA_BUFFER_SIZE
Value given here will be rounded up to next multiple of 32 bytes.
menu "RS485 transmit enable support"
config UART0_RS485CONTROL
bool "Use UART0 RTS as RS-485 transmit enable"
default n
select SERIAL_RS485CONTROL
depends on KINETIS_UART0 && UART0_IFLOWCONTROL
---help---
Enable RS-485 transmit enable on UART0.
config UART1_RS485CONTROL
bool "Use UART1 RTS as RS-485 transmit enable"
default n
select SERIAL_RS485CONTROL
depends on KINETIS_UART1 && UART1_IFLOWCONTROL
---help---
Enable RS-485 transmit enable on UART1.
config UART2_RS485CONTROL
bool "Use UART2 RTS as RS-485 transmit enable"
default n
select SERIAL_RS485CONTROL
depends on KINETIS_UART2 && UART2_IFLOWCONTROL
---help---
Enable RS-485 transmit enable on UART2.
config UART3_RS485CONTROL
bool "Use UART3 RTS as RS-485 transmit enable"
default n
select SERIAL_RS485CONTROL
depends on KINETIS_UART3 && UART3_IFLOWCONTROL
---help---
Enable RS-485 transmit enable on UART3.
config UART4_RS485CONTROL
bool "Use UART4 RTS as RS-485 transmit enable"
default n
select SERIAL_RS485CONTROL
depends on KINETIS_UART4 && UART4_IFLOWCONTROL
---help---
Enable RS-485 transmit enable on UART4.
config UART5_RS485CONTROL
bool "Use UART5 RTS as RS-485 transmit enable"
default n
select SERIAL_RS485CONTROL
depends on KINETIS_UART5 && UART5_IFLOWCONTROL
---help---
Enable RS-485 transmit enable on UART5.
endmenu # Kinetis RS485 transmit driver support
endmenu # Kinetis UART Configuration
menu "Kinetis LPUART Configuration"
arch/arm/src/kinetis/kinetis.h
+1 -1
View File
@@ -475,7 +475,7 @@ void kinetis_uartconfigure(uintptr_t uart_base,
uint32_t baud, uint32_t clock,
unsigned int parity, unsigned int nbits,
unsigned int stop2,
bool iflow, bool oflow);
bool iflow, bool oflow, bool rs485control);
#endif
/****************************************************************************
arch/arm/src/kinetis/kinetis_lowputc.c
+38 -2
View File
@@ -53,36 +53,54 @@
#if !defined(CONFIG_UART0_OFLOWCONTROL)
# define CONFIG_UART0_OFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART0_RS485CONTROL)
# define CONFIG_UART0_RS485CONTROL 0
#endif
#if !defined(CONFIG_UART1_IFLOWCONTROL)
# define CONFIG_UART1_IFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART1_OFLOWCONTROL)
# define CONFIG_UART1_OFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART1_RS485CONTROL)
# define CONFIG_UART1_RS485CONTROL 0
#endif
#if !defined(CONFIG_UART2_IFLOWCONTROL)
# define CONFIG_UART2_IFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART2_OFLOWCONTROL)
# define CONFIG_UART2_OFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART2_RS485CONTROL)
# define CONFIG_UART2_RS485CONTROL 0
#endif
#if !defined(CONFIG_UART3_IFLOWCONTROL)
# define CONFIG_UART3_IFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART3_OFLOWCONTROL)
# define CONFIG_UART3_OFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART3_RS485CONTROL)
# define CONFIG_UART3_RS485CONTROL 0
#endif
#if !defined(CONFIG_UART4_IFLOWCONTROL)
# define CONFIG_UART4_IFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART4_OFLOWCONTROL)
# define CONFIG_UART4_OFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART4_RS485CONTROL)
# define CONFIG_UART4_RS485CONTROL 0
#endif
#if !defined(CONFIG_UART5_IFLOWCONTROL)
# define CONFIG_UART5_IFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART5_OFLOWCONTROL)
# define CONFIG_UART5_OFLOWCONTROL 0
#endif
#if !defined(CONFIG_UART5_RS485CONTROL)
# define CONFIG_UART5_RS485CONTROL 0
#endif
#if !defined(CONFIG_LPUART0_IFLOWCONTROL)
# define CONFIG_LPUART0_IFLOWCONTROL 0
@@ -127,6 +145,7 @@
# define CONSOLE_PARITY CONFIG_UART0_PARITY
# define CONSOLE_IFLOW CONFIG_UART0_IFLOWCONTROL
# define CONSOLE_OFLOW CONFIG_UART0_OFLOWCONTROL
# define CONSOLE_RS485CONTROL CONFIG_UART0_RS485CONTROL
# elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define CONSOLE_BASE KINETIS_UART1_BASE
# define CONSOLE_FREQ BOARD_CORECLK_FREQ
@@ -136,6 +155,7 @@
# define CONSOLE_PARITY CONFIG_UART1_PARITY
# define CONSOLE_IFLOW CONFIG_UART1_IFLOWCONTROL
# define CONSOLE_OFLOW CONFIG_UART1_OFLOWCONTROL
# define CONSOLE_RS485CONTROL CONFIG_UART1_RS485CONTROL
# elif defined(CONFIG_UART2_SERIAL_CONSOLE)
# define CONSOLE_BASE KINETIS_UART2_BASE
# define CONSOLE_FREQ BOARD_BUS_FREQ
@@ -145,6 +165,7 @@
# define CONSOLE_PARITY CONFIG_UART2_PARITY
# define CONSOLE_IFLOW CONFIG_UART2_IFLOWCONTROL
# define CONSOLE_OFLOW CONFIG_UART2_OFLOWCONTROL
# define CONSOLE_RS485CONTROL CONFIG_UART2_RS485CONTROL
# elif defined(CONFIG_UART3_SERIAL_CONSOLE)
# define CONSOLE_BASE KINETIS_UART3_BASE
# define CONSOLE_FREQ BOARD_BUS_FREQ
@@ -154,6 +175,7 @@
# define CONSOLE_PARITY CONFIG_UART3_PARITY
# define CONSOLE_IFLOW CONFIG_UART3_IFLOWCONTROL
# define CONSOLE_OFLOW CONFIG_UART3_OFLOWCONTROL
# define CONSOLE_RS485CONTROL CONFIG_UART3_RS485CONTROL
# elif defined(CONFIG_UART4_SERIAL_CONSOLE)
# define CONSOLE_BASE KINETIS_UART4_BASE
# define CONSOLE_FREQ BOARD_BUS_FREQ
@@ -163,6 +185,7 @@
# define CONSOLE_PARITY CONFIG_UART4_PARITY
# define CONSOLE_IFLOW CONFIG_UART4_IFLOWCONTROL
# define CONSOLE_OFLOW CONFIG_UART4_OFLOWCONTROL
# define CONSOLE_RS485CONTROL CONFIG_UART4_RS485CONTROL
# elif defined(CONFIG_UART5_SERIAL_CONSOLE)
# define CONSOLE_BASE KINETIS_UART5_BASE
# define CONSOLE_FREQ BOARD_BUS_FREQ
@@ -172,6 +195,7 @@
# define CONSOLE_PARITY CONFIG_UART5_PARITY
# define CONSOLE_IFLOW CONFIG_UART5_IFLOWCONTROL
# define CONSOLE_OFLOW CONFIG_UART5_OFLOWCONTROL
# define CONSOLE_RS485CONTROL CONFIG_UART5_RS485CONTROL
# elif defined(HAVE_UART_CONSOLE)
# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
# endif
@@ -440,7 +464,7 @@ void kinetis_lowsetup(void)
kinetis_uartconfigure(CONSOLE_BASE, CONSOLE_BAUD, CONSOLE_FREQ, \
CONSOLE_PARITY, CONSOLE_BITS, CONSOLE_2STOP, \
CONSOLE_IFLOW, CONSOLE_OFLOW);
CONSOLE_IFLOW, CONSOLE_OFLOW, CONSOLE_RS485CONTROL);
# endif
#endif /* HAVE_UART_DEVICE */
@@ -593,7 +617,7 @@ void kinetis_lpuartreset(uintptr_t uart_base)
void kinetis_uartconfigure(uintptr_t uart_base, uint32_t baud,
uint32_t clock, unsigned int parity,
unsigned int nbits, unsigned int stop2,
bool iflow, bool oflow)
bool iflow, bool oflow, bool rs485control)
{
uint32_t sbr;
uint32_t brfa;
@@ -753,11 +777,23 @@ void kinetis_uartconfigure(uintptr_t uart_base, uint32_t baud,
regval &= ~(UART_MODEM_TXCTSE | UART_MODEM_RXRTSE);
#ifdef CONFIG_SERIAL_IFLOWCONTROL
#ifdef CONFIG_SERIAL_RS485CONTROL
if (iflow && rs485control)
{
regval |= UART_MODEM_TXRTSE;
regval |= UART_MODEM_TXRTSPOL;
}
else
{
regval |= UART_MODEM_RXRTSE;
}
#else
if (iflow)
{
regval |= UART_MODEM_RXRTSE;
}
#endif
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
if (oflow)
arch/arm/src/kinetis/kinetis_serial.c
+35 -2
View File
@@ -292,6 +292,9 @@ struct up_dev_s
uint8_t stop2; /* Use 2 stop bits */
#ifdef CONFIG_SERIAL_IFLOWCONTROL
bool iflow; /* input flow control (RTS) enabled */
#ifdef CONFIG_SERIAL_RS485CONTROL
bool rs485control; /* RTS used as transmit enable */
#endif
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
bool oflow; /* output flow control (CTS) enabled */
@@ -482,6 +485,9 @@ static struct up_dev_s g_uart0priv =
# if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART0_IFLOWCONTROL)
.iflow = true,
.rts_gpio = PIN_UART0_RTS,
# if defined(CONFIG_SERIAL_RS485CONTROL) && defined(CONFIG_UART0_RS485CONTROL)
.rs485control = true,
# endif
# endif
# ifdef CONFIG_KINETIS_UART0_RXDMA
.rxdma_reqsrc = KINETIS_DMA_REQUEST_SRC_UART0_RX,
@@ -533,6 +539,9 @@ static struct up_dev_s g_uart1priv =
# if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART1_IFLOWCONTROL)
.iflow = true,
.rts_gpio = PIN_UART1_RTS,
# if defined(CONFIG_SERIAL_RS485CONTROL) && defined(CONFIG_UART1_RS485CONTROL)
.rs485control = true,
# endif
# endif
# ifdef CONFIG_KINETIS_UART1_RXDMA
.rxdma_reqsrc = KINETIS_DMA_REQUEST_SRC_UART1_RX,
@@ -584,6 +593,9 @@ static struct up_dev_s g_uart2priv =
# if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART2_IFLOWCONTROL)
.iflow = true,
.rts_gpio = PIN_UART2_RTS,
# if defined(CONFIG_SERIAL_RS485CONTROL) && defined(CONFIG_UART2_RS485CONTROL)
.rs485control = true,
# endif
# endif
# ifdef CONFIG_KINETIS_UART2_RXDMA
.rxdma_reqsrc = KINETIS_DMA_REQUEST_SRC_UART2_RX,
@@ -635,6 +647,9 @@ static struct up_dev_s g_uart3priv =
# if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART3_IFLOWCONTROL)
.iflow = true,
.rts_gpio = PIN_UART3_RTS,
# if defined(CONFIG_SERIAL_RS485CONTROL) && defined(CONFIG_UART3_RS485CONTROL)
.rs485control = true,
# endif
# endif
# ifdef CONFIG_KINETIS_UART3_RXDMA
.rxdma_reqsrc = KINETIS_DMA_REQUEST_SRC_UART3_RX,
@@ -686,6 +701,9 @@ static struct up_dev_s g_uart4priv =
# if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART4_IFLOWCONTROL)
.iflow = true,
.rts_gpio = PIN_UART4_RTS,
# if defined(CONFIG_SERIAL_RS485CONTROL) && defined(CONFIG_UART4_RS485CONTROL)
.rs485control = true,
# endif
# endif
# ifdef CONFIG_KINETIS_UART4_RXDMA
.rxdma_reqsrc = KINETIS_DMA_REQUEST_SRC_UART4_RXTX,
@@ -737,6 +755,9 @@ static struct up_dev_s g_uart5priv =
# if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART5_IFLOWCONTROL)
.iflow = true,
.rts_gpio = PIN_UART5_RTS,
# if defined(CONFIG_SERIAL_RS485CONTROL) && defined(CONFIG_UART5_RS485CONTROL)
.rs485control = true,
# endif
# endif
# ifdef CONFIG_KINETIS_UART5_RXDMA
.rxdma_reqsrc = KINETIS_DMA_REQUEST_SRC_UART5_RX,
@@ -904,8 +925,14 @@ static int up_setup(struct uart_dev_s *dev)
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
#ifdef CONFIG_SERIAL_IFLOWCONTROL
bool iflow = priv->iflow;
#ifdef CONFIG_SERIAL_RS485CONTROL
bool rs485control = priv->rs485control;
#else
bool rs485control = false;
#endif
#else
bool iflow = false;
bool rs485control = false;
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
bool oflow = priv->oflow;
@@ -917,7 +944,7 @@ static int up_setup(struct uart_dev_s *dev)
kinetis_uartconfigure(priv->uartbase, priv->baud, priv->clock,
priv->parity, priv->bits, priv->stop2,
iflow, oflow);
iflow, oflow, rs485control);
#endif
/* Make sure that all interrupts are disabled */
@@ -1440,9 +1467,15 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
* TCSADRAIN / TCSAFLUSH
*/
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_SERIAL_RS485CONTROL)
kinetis_uartconfigure(priv->uartbase, priv->baud, priv->clock,
priv->parity, priv->bits, priv->stop2,
iflow, oflow);
iflow, oflow, priv->rs485control);
#else
kinetis_uartconfigure(priv->uartbase, priv->baud, priv->clock,
priv->parity, priv->bits, priv->stop2,
iflow, oflow, false);
#endif
}
break;
#endif /* CONFIG_SERIAL_TERMIOS */