/****************************************************************************
* arch/arm/src/efm32/efm32_lowputc.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "chip/efm32_memorymap.h"
#include "chip/efm32_usart.h"
#include "chip/efm32_leuart.h"
#include "chip/efm32_cmu.h"
#include "efm32_gpio.h"
#include "efm32_lowputc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Console U[S]ART base address */
#if defined(HAVE_UART_CONSOLE)
# if defined(CONFIG_USART0_SERIAL_CONSOLE)
# define CONSOLE_BASE EFM32_USART0_BASE
# define CONSOLE_BAUD CONFIG_USART0_BAUD
# define CONSOLE_PARITY CONFIG_USART0_PARITY
# define CONSOLE_NBITS CONFIG_UART0_BITS
# define CONSOLE_2STOP CONFIG_UART0_2STOP
# elif defined(CONFIG_USART1_SERIAL_CONSOLE)
# define CONSOLE_BASE EFM32_USART1_BASE
# define CONSOLE_BAUD CONFIG_USART1_BAUD
# define CONSOLE_PARITY CONFIG_USART1_PARITY
# define CONSOLE_NBITS CONFIG_UART1_BITS
# define CONSOLE_2STOP CONFIG_UART1_2STOP
# elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define CONSOLE_BASE EFM32_USART2_BASE
# define CONSOLE_BAUD CONFIG_USART2_BAUD
# define CONSOLE_PARITY CONFIG_USART2_PARITY
# define CONSOLE_NBITS CONFIG_UART2_BITS
# define CONSOLE_2STOP CONFIG_UART2_2STOP
# elif defined(CONFIG_UART0_SERIAL_CONSOLE)
# define CONSOLE_BASE EFM32_UART0_BASE
# define CONSOLE_BAUD CONFIG_UART0_BAUD
# define CONSOLE_PARITY CONFIG_UART0_PARITY
# define CONSOLE_NBITS CONFIG_UART0_BITS
# define CONSOLE_2STOP CONFIG_UART0_2STOP
# elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define CONSOLE_BASE EFM32_UART1_BASE
# define CONSOLE_BAUD CONFIG_UART1_BAUD
# define CONSOLE_PARITY CONFIG_UART1_PARITY
# define CONSOLE_NBITS CONFIG_UART1_BITS
# define CONSOLE_2STOP CONFIG_UART1_2STOP
# else
# error No U[S]ART console is selected???? Internal craziness!!!
# endif
#elif defined(HAVE_LEUART_CONSOLE)
# if defined(CONFIG_LEUART0_SERIAL_CONSOLE)
# define CONSOLE_BASE EFM32_LEUART0_BASE
# define CONSOLE_BAUD CONFIG_LEUART0_BAUD
# define CONSOLE_PARITY CONFIG_LEUART0_PARITY
# define CONSOLE_NBITS CONFIG_LEUART0_BITS
# define CONSOLE_2STOP CONFIG_LEUART0_2STOP
# elif defined(CONFIG_LEUART1_SERIAL_CONSOLE)
# define CONSOLE_BASE EFM32_LEUART1_BASE
# define CONSOLE_BAUD CONFIG_LEUART1_BAUD
# define CONSOLE_PARITY CONFIG_LEUART1_PARITY
# define CONSOLE_NBITS CONFIG_LEUART1_BITS
# define CONSOLE_2STOP CONFIG_LEUART1_2STOP
# else
# error No U[S]ART console is selected???? Internal craziness!!!
# endif
#endif /* HAVE_UART_CONSOLE */
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: efm32_uart_setbaud
*
* Description:
* Set optimal oversampling and set the baud for this U[S]ART.
*
****************************************************************************/
#ifdef HAVE_UART_DEVICE
static void efm32_uart_setbaud(uintptr_t base, uint32_t baud)
{
uint64_t clkdiv;
uint64_t maxover;
uint32_t oversample;
uint32_t regval;
uint32_t ovs;
/* Select oversampling. We would like to oversample at the standard value
* of 16, but we may not be able to achieve the baud with sufficient
* accuracy if the baud is close to the HFPERCLK frequency.
*
* USART baud is generated according to:
*
* baud = fHFPERCLK/(oversample * (1 + CLKDIV/256))
*
* Or, equivalently:
*
* CLKDIV = 256 * (fHFPERCLK / (oversample * baud) - 1)
* oversample = 256 * fHFPERCLK / (baud * (CLKDIV + 256))
*
* Suppose we insist on a CLKDIV >= 24, then:
*
* MAXoversample = 256 * fHFPERCLK / (280 * baud))
*
* Example 1: fHPERCLK = 32MHz, baud=115200
* MAXoversample = 254.0, Use oversample = 16
* CLKDIV = 4188.4
* baud = 115200.0
* Example 2: fHPERCLK = 32.768KHz, baud=2400
* MAXoversample = 12.5, Use oversample = 8
* CLKDIV = 180.90
* baud = 2400.0
*/
maxover = (((uint64_t)BOARD_HFPERCLK_FREQUENCY << 8) / 280) / baud;
if (maxover >= 16)
{
DEBUGASSERT(baud <= (BOARD_HFPERCLK_FREQUENCY / 16));
oversample = 16;
ovs = USART_CTRL_OVS_X16;
}
else if (maxover >= 8)
{
DEBUGASSERT(baud <= (BOARD_HFPERCLK_FREQUENCY / 8));
oversample = 8;
ovs = USART_CTRL_OVS_X8;
}
else if (maxover >= 6)
{
DEBUGASSERT(baud <= (BOARD_HFPERCLK_FREQUENCY / 6));
oversample = 6;
ovs = USART_CTRL_OVS_X6;
}
else /* if (maxover >= 4) */
{
DEBUGASSERT(maxover >= 4 && baud <= (BOARD_HFPERCLK_FREQUENCY / 4));
oversample = 4;
ovs = USART_CTRL_OVS_X4;
}
/* CLKDIV in asynchronous mode is given by:
*
* CLKDIV = 256 * (fHFPERCLK / (oversample * baud) - 1)
*
* or
*
* CLKDIV = (256 * fHFPERCLK) / (oversample * baud) - 256
*/
clkdiv = ((uint64_t)BOARD_HFPERCLK_FREQUENCY << 8) / ((uint64_t)baud * oversample);
if (clkdiv > 256)
{
clkdiv -= 256;
}
else
{
clkdiv = 0;
}
/* Set up the selected oversampling */
regval = getreg32(base + EFM32_USART_CTRL_OFFSET);
regval &= ~_USART_CTRL_OVS_MASK;
regval |= ovs;
putreg32(regval, base + EFM32_USART_CTRL_OFFSET);
/* Set up the selected baud divisor. The computation above already took
* in account of _USART_CLKDIV_DIV_SHIFT
*/
regval = (uint32_t)clkdiv & _USART_CLKDIV_MASK;
putreg32(regval, base + EFM32_USART_CLKDIV_OFFSET);
}
#endif
/****************************************************************************
* Name: efm32_leuart_setbaud
*
* Description:
* Set optimal oversampling and set the baud for this U[S]ART.
*
****************************************************************************/
#ifdef HAVE_LEUART_DEVICE
static void efm32_leuart_setbaud(uintptr_t base, uint32_t baud)
{
uint32_t clkdiv;
/* Baud is configured by:
*
* baud = fLEUART / (1 + CLKDIV / 256)
*
* Or
*
* CLKDIV = 256 * (fLEUART / baud - 1)
* CLKDIV = (256 * fLEUART) / baud - 256
*/
clkdiv = (BOARD_LFBCLK_FREQUENCY << 8) / baud;
if (clkdiv > 256)
{
clkdiv -= 256;
}
else
{
clkdiv = 0;
}
DEBUGASSERT(clkdiv <= _LEUART_CLKDIV_MASK);
/* Set up the selected baud */
putreg32((uint32_t)clkdiv & _LEUART_CLKDIV_DIV_MASK,
base + EFM32_LEUART_CLKDIV_OFFSET);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: efm32_lowsetup
*
* Description:
* Called at the very beginning of _start. Performs low level
* initialization including setup of the console UART. This UART done
* early so that the serial console is available for debugging very early
* in the boot sequence.
*
****************************************************************************/
void efm32_lowsetup(void)
{
#if defined(HAVE_UART_DEVICE) || defined(HAVE_LEUART_DEVICE)
uint32_t regval;
#endif
#if defined(HAVE_UART_DEVICE) || defined(HAVE_SPI_DEVICE)
/* Enable clocking to configured UART/USART interfaces */
regval = getreg32(EFM32_CMU_HFPERCLKEN0);
regval &= ~(CMU_HFPERCLKEN0_USART0
| CMU_HFPERCLKEN0_USART1
#ifdef CONFIG_EFM32_HAVE_USART2
| CMU_HFPERCLKEN0_USART2
#endif
#ifdef CONFIG_EFM32_HAVE_UART0
| CMU_HFPERCLKEN0_UART0
#endif
#ifdef CONFIG_EFM32_HAVE_UART1
| CMU_HFPERCLKEN0_UART1
#endif
);
#ifdef CONFIG_EFM32_USART0
regval |= CMU_HFPERCLKEN0_USART0;
#endif
#ifdef CONFIG_EFM32_USART1
regval |= CMU_HFPERCLKEN0_USART1;
#endif
#ifdef CONFIG_EFM32_USART2
regval |= CMU_HFPERCLKEN0_USART2;
#endif
#ifdef CONFIG_EFM32_UART0
regval |= CMU_HFPERCLKEN0_UART0;
#endif
#ifdef CONFIG_EFM32_UART1
regval |= CMU_HFPERCLKEN0_UART1;
#endif
putreg32(regval, EFM32_CMU_HFPERCLKEN0);
#endif /* HAVE_UART_DEVICE */
#ifdef HAVE_LEUART_DEVICE
/* Enable the LE interface clock must be enabled in CMU_HFCORECLKEN0 */
regval = getreg32(EFM32_CMU_HFCORECLKEN0);
regval |= CMU_HFCORECLKEN0_LE;
putreg32(regval, EFM32_CMU_HFCORECLKEN0);
/* Enable clocking to configured LEUART interfaces */
regval = getreg32(EFM32_CMU_LFBCLKEN0);
regval &= ~(CMU_LFBCLKEN0_LEUART0
#ifdef CONFIG_EFM32_LEUART1
| CMU_LFBCLKEN0_LEUART1
#endif
);
#ifdef CONFIG_EFM32_LEUART0
regval |= CMU_LFBCLKEN0_LEUART0;
#endif
#ifdef CONFIG_EFM32_LEUART1
regval |= CMU_LFBCLKEN0_LEUART1;
#endif
putreg32(regval, EFM32_CMU_LFBCLKEN0);
#endif /* HAVE_LEUART_DEVICE */
#if defined(HAVE_UART_DEVICE) || defined(HAVE_SPI_DEVICE)
/* Enable output on U[S]ART output pins */
#ifdef CONFIG_EFM32_USART0
efm32_configgpio(GPIO_INPUT | GPIO_INT_NONE | BOARD_USART0_RX_GPIO);
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_USART0_TX_GPIO);
#ifdef CONFIG_EFM32_USART0_ISSPI
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_USART0_CLK_GPIO);
#endif
#endif
#ifdef CONFIG_EFM32_USART1
efm32_configgpio(GPIO_INPUT | GPIO_INT_NONE | BOARD_USART1_RX_GPIO);
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_USART1_TX_GPIO);
#ifdef CONFIG_EFM32_USART1_ISSPI
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_USART1_CLK_GPIO);
#endif
#endif
#ifdef CONFIG_EFM32_USART2
efm32_configgpio(GPIO_INPUT | GPIO_INT_NONE | BOARD_USART2_RX_GPIO);
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_USART2_TX_GPIO);
#ifdef CONFIG_EFM32_USART2_ISSPI
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_USART2_CLK_GPIO);
#endif
#endif
#ifdef CONFIG_EFM32_UART0
efm32_configgpio(GPIO_INPUT | GPIO_INT_NONE | BOARD_UART0_RX_GPIO);
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_UART0_TX_GPIO);
#endif
#ifdef CONFIG_EFM32_UART1
efm32_configgpio(GPIO_INPUT | GPIO_INT_NONE | BOARD_UART1_RX_GPIO);
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_UART1_TX_GPIO);
#endif
#endif /* HAVE_UART_DEVICE */
#ifdef HAVE_LEUART_DEVICE
/* Enable output on LEUART output pins */
#ifdef CONFIG_EFM32_LEUART0
efm32_configgpio(GPIO_INPUT | GPIO_INT_NONE | BOARD_LEUART0_RX_GPIO);
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_LEUART0_TX_GPIO);
#endif
#ifdef CONFIG_EFM32_LEUART1
efm32_configgpio(GPIO_INPUT | GPIO_INT_NONE | BOARD_LEUART1_RX_GPIO);
efm32_configgpio(GPIO_OUTPUT_PUSHPULL | GPIO_OUTPUT_CLEAR |
GPIO_DRIVE_STANDARD | BOARD_LEUART1_TX_GPIO);
#endif
#endif /* HAVE_LEUART_DEVICE */
#if defined(HAVE_UART_DEVICE) || defined(HAVE_SPI_DEVICE)
/* Set location in the U[S]ART ROUTE registers */
#ifdef CONFIG_EFM32_USART0
regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN |
(BOARD_USART0_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT));
#ifdef CONFIG_EFM32_USART0_ISSPI
regval |= USART_ROUTE_CLKPEN;
#endif
putreg32(regval, EFM32_USART0_ROUTE);
#endif
#ifdef CONFIG_EFM32_USART1
regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN |
(BOARD_USART1_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT));
#ifdef CONFIG_EFM32_USART1_ISSPI
regval |= USART_ROUTE_CLKPEN;
#endif
putreg32(regval, EFM32_USART1_ROUTE);
#endif
#ifdef CONFIG_EFM32_USART2
regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN |
(BOARD_USART2_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT));
#ifdef CONFIG_EFM32_USART2_ISSPI
regval |= USART_ROUTE_CLKPEN;
#endif
putreg32(regval, EFM32_USART2_ROUTE);
#endif
#ifdef CONFIG_EFM32_UART0
regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN |
(BOARD_UART0_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT));
putreg32(regval, EFM32_UART0_ROUTE);
#endif
#ifdef CONFIG_EFM32_UART1
regval = (USART_ROUTE_RXPEN | USART_ROUTE_TXPEN |
(BOARD_UART1_ROUTE_LOCATION << _USART_ROUTE_LOCATION_SHIFT));
putreg32(regval, EFM32_UART1_ROUTE);
#endif
#endif /* HAVE_UART_DEVICE */
#ifdef HAVE_LEUART_DEVICE
/* Set location in the LEUART ROUTE registers */
#ifdef CONFIG_EFM32_LEUART0
regval = (LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN |
(BOARD_LEUART0_ROUTE_LOCATION << _LEUART_ROUTE_LOCATION_SHIFT));
putreg32(regval, EFM32_LEUART0_ROUTE);
#endif
#ifdef CONFIG_EFM32_LEUART1
regval = (LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN |
(BOARD_LEUART1_ROUTE_LOCATION << _LEUART_ROUTE_LOCATION_SHIFT));
putreg32(regval, EFM32_LEUART1_ROUTE);
#endif
#endif /* HAVE_LEUART_DEVICE */
#if defined(HAVE_UART_CONSOLE)
/* Configure the U[S]ART serial console */
efm32_uartconfigure(CONSOLE_BASE, CONSOLE_BAUD, CONSOLE_PARITY,
CONSOLE_NBITS, CONSOLE_2STOP);
#elif defined(HAVE_LEUART_CONSOLE)
/* Configure the LEUART serial console */
efm32_leuartconfigure(CONSOLE_BASE, CONSOLE_BAUD, CONSOLE_PARITY,
CONSOLE_NBITS, CONSOLE_2STOP);
#endif
}
/*****************************************************************************
* Name: efm32_lowputc
*
* Description:
* Output one character to the UART using a simple polling method.
*
*****************************************************************************/
#if defined(HAVE_UART_CONSOLE)
void efm32_lowputc(uint32_t ch)
{
/* The TX Buffer Level (TXBL) status bit indicates the level of the
* transmit buffer. If TXBIL is set, TXBL is set whenever the transmit
* buffer is half-full or empty.
*/
while ((getreg32(CONSOLE_BASE + EFM32_USART_STATUS_OFFSET) & USART_STATUS_TXBL) == 0);
/* Then send the character */
putreg32((uint32_t)ch, CONSOLE_BASE + EFM32_USART_TXDATA_OFFSET);
}
#elif defined(HAVE_LEUART_CONSOLE)
void efm32_lowputc(uint32_t ch)
{
/* The TX Buffer Level (TXBL) status bit indicates the level of the
* transmit buffer. If TXBIL is set, TXBL is set whenever the transmit
* buffer is half-full or empty.
*/
while ((getreg32(CONSOLE_BASE + EFM32_LEUART_STATUS_OFFSET) & LEUART_STATUS_TXBL) == 0);
/* Then send the character */
putreg32((uint32_t)ch, CONSOLE_BASE + EFM32_LEUART_TXDATA_OFFSET);
}
#endif
/*****************************************************************************
* Name: efm32_uartconfigure
*
* Description:
* Configure a U[S]ART as a RS-232 UART.
*
*****************************************************************************/
#ifdef HAVE_UART_DEVICE
void efm32_uartconfigure(uintptr_t base, uint32_t baud, unsigned int parity,
unsigned int nbits, bool stop2)
{
uint32_t regval = 0;
/* Make sure that the U[S]ART registers are in the reset state (except for
* ROUTE information which must be preserved).
*/
efm32_uart_reset(base);
/* Configure number of data bits */
switch (nbits)
{
case 4:
regval |= USART_FRAME_DATABITS_FOUR;
break;
case 5:
regval |= USART_FRAME_DATABITS_FIVE;
break;
case 6:
regval |= USART_FRAME_DATABITS_SIX;
break;
case 7:
regval |= USART_FRAME_DATABITS_SEVEN;
break;
default:
case 8:
regval |= USART_FRAME_DATABITS_EIGHT;
break;
case 9:
regval |= USART_FRAME_DATABITS_NINE;
break;
case 10:
regval |= USART_FRAME_DATABITS_TEN;
break;
case 11:
regval |= USART_FRAME_DATABITS_ELEVEN;
break;
case 12:
regval |= USART_FRAME_DATABITS_TWELVE;
break;
case 13:
regval |= USART_FRAME_DATABITS_THIRTEEN;
break;
case 14:
regval |= USART_FRAME_DATABITS_FOURTEEN;
break;
case 15:
regval |= USART_FRAME_DATABITS_FIFTEEN;
break;
case 16:
regval |= USART_FRAME_DATABITS_SIXTEEN;
break;
}
/* Configure parity */
switch (parity)
{
default:
case 0:
regval |= USART_FRAME_PARITY_NONE;
break;
case 1:
regval |= USART_FRAME_PARITY_ODD;
break;
case 2:
regval |= USART_FRAME_PARITY_EVEN;
break;
}
/* Configure stop bits */
if (stop2)
{
regval |= USART_FRAME_STOPBITS_TWO;
}
else
{
regval |= USART_FRAME_STOPBITS_ONE;
}
putreg32(regval, base + EFM32_USART_FRAME_OFFSET);
/* Set the baud clock divisor */
efm32_uart_setbaud(base, baud);
/* Enable the U[S]ART */
putreg32(USART_CMD_RXEN | USART_CMD_TXEN, base + EFM32_USART_CMD_OFFSET);
}
#endif
/*****************************************************************************
* Name: efm32_leuartconfigure
*
* Description:
* Configure a LEUART as a RS-232 UART.
*
*****************************************************************************/
#ifdef HAVE_LEUART_DEVICE
void efm32_leuartconfigure(uintptr_t base, uint32_t baud, unsigned int parity,
unsigned int nbits, bool stop2)
{
uint32_t regval = 0;
/* Make sure that the LEUART registers are in the reset state (except for
* ROUTE information which must be preserved).
*/
efm32_leuart_reset(base);
/* Configure number of data bits */
switch (nbits)
{
default:
case 8:
regval |= LEUART_CTRL_DATABITS_EIGHT;
break;
case 9:
regval |= LEUART_CTRL_DATABITS_NINE;
break;
}
/* Configure parity */
switch (parity)
{
default:
case 0:
regval |= LEUART_CTRL_PARITY_NONE;
break;
case 1:
regval |= LEUART_CTRL_PARITY_ODD;
break;
case 2:
regval |= LEUART_CTRL_PARITY_EVEN;
break;
}
/* Configure stop bits */
if (stop2)
{
regval |= _LEUART_CTRL_STOPBITS_TWO;
}
else
{
regval |= _LEUART_CTRL_STOPBITS_ONE;
}
putreg32(regval, base + EFM32_LEUART_CTRL_OFFSET);
/* Set the baud clock divisor */
efm32_leuart_setbaud(base, baud);
/* Enable the LEUART */
putreg32(LEUART_CMD_RXEN | LEUART_CMD_TXEN, base + EFM32_LEUART_CMD_OFFSET);
}
#endif
/*****************************************************************************
* Name: efm32_uart_reset
*
* Description:
* Reset the USART/UART by disabling it and restoring all of the registers
* to the initial, reset value. Only the ROUTE data set by efm32_lowsetup
* is preserved.
*
*****************************************************************************/
#if defined(HAVE_UART_DEVICE) || defined(HAVE_SPI_DEVICE)
void efm32_uart_reset(uintptr_t base)
{
putreg32(USART_CMD_RXDIS | USART_CMD_TXDIS | USART_CMD_MASTERDIS |
USART_CMD_RXBLOCKDIS | USART_CMD_TXTRIDIS | USART_CMD_CLEARTX |
USART_CMD_CLEARRX, base + EFM32_USART_CMD_OFFSET);
putreg32(_USART_CTRL_RESETVALUE, base + EFM32_USART_CTRL_OFFSET);
putreg32(_USART_FRAME_RESETVALUE, base + EFM32_USART_FRAME_OFFSET);
putreg32(_USART_TRIGCTRL_RESETVALUE, base + EFM32_USART_TRIGCTRL_OFFSET);
putreg32(_USART_CLKDIV_RESETVALUE, base + EFM32_USART_CLKDIV_OFFSET);
putreg32(_USART_IEN_RESETVALUE, base + EFM32_USART_IEN_OFFSET);
putreg32(_USART_IFC_MASK, base + EFM32_USART_IFC_OFFSET);
putreg32(_USART_IRCTRL_RESETVALUE, base + EFM32_USART_IRCTRL_OFFSET);
#if defined(EFM32_USART_INPUT_OFFSET)
putreg32(_USART_INPUT_RESETVALUE, base + EFM32_USART_INPUT_OFFSET);
#endif
#if defined(EFM32_USART_I2SCTRL_OFFSET)
putreg32(_USART_I2SCTRL_RESETVALUE, base + EFM32_USART_I2SCTRL_OFFSET);
#endif
}
#endif
/*****************************************************************************
* Name: efm32_leuart_reset
*
* Description:
* Reset the USART/UART by disabling it and restoring all of the registers
* to the initial, reset value. Only the ROUTE data set by efm32_lowsetup
* is preserved.
*
*****************************************************************************/
#ifdef HAVE_LEUART_DEVICE
void efm32_leuart_reset(uintptr_t base)
{
putreg32(LEUART_CMD_RXDIS | LEUART_CMD_TXDIS | LEUART_CMD_RXBLOCKDIS |
LEUART_CMD_CLEARTX | LEUART_CMD_CLEARRX,
base + EFM32_LEUART_CMD_OFFSET);
putreg32(_LEUART_CTRL_RESETVALUE, base + EFM32_LEUART_CTRL_OFFSET);
putreg32(_LEUART_CLKDIV_RESETVALUE, base + EFM32_LEUART_CLKDIV_OFFSET);
putreg32(_LEUART_STARTFRAME_RESETVALUE, base + EFM32_LEUART_STARTFRAME_OFFSET);
putreg32(_LEUART_SIGFRAME_RESETVALUE, base + EFM32_LEUART_SIGFRAME_OFFSET);
putreg32(_LEUART_IEN_RESETVALUE, base + EFM32_LEUART_IEN_OFFSET);
putreg32(_LEUART_IFC_MASK, base + EFM32_LEUART_IFC_OFFSET);
putreg32(_LEUART_PULSECTRL_RESETVALUE, base + EFM32_LEUART_PULSECTRL_OFFSET);
#if defined(EFM32_LEUART_INPUT_OFFSET)
putreg32(_LEUART_INPUT_RESETVALUE, base + EFM32_LEUART_INPUT_OFFSET);
#endif
}
#endif
