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nuttx-bb/nuttx/arch/arm/src/stm32/stm32_lowputc.c

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/**************************************************************************
* arch/arm/src/stm32/stm32_lowputc.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <arch/board/board.h>
#include "up_internal.h"
#include "up_arch.h"
#include "chip.h"
#include "stm32_rcc.h"
#include "stm32_gpio.h"
#include "stm32_uart.h"
#include "stm32_internal.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/* Configuration **********************************************************/
/* Is there a serial console? */
#if defined(CONFIG_USART1_SERIAL_CONSOLE) && defined(CONFIG_STM32_USART1)
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART2_SERIAL_CONSOLE) && defined(CONFIG_STM32_USART2)
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART3_SERIAL_CONSOLE) && defined(CONFIG_STM32_USART3)
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#else
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# undef HAVE_CONSOLE
#endif
/* Select USART parameters for the selected console */
#if defined(CONFIG_USART1_SERIAL_CONSOLE)
# define STM32_CONSOLE_BASE STM32_USART1_BASE
# define STM32_APBCLOCK STM32_PCLK2_FREQUENCY
# define STM32_CONSOLE_BAUD CONFIG_USART1_BAUD
# define STM32_CONSOLE_BITS CONFIG_USART1_BITS
# define STM32_CONSOLE_PARITY CONFIG_USART1_PARITY
# define STM32_CONSOLE_2STOP CONFIG_USART1_2STOP
#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define STM32_CONSOLE_BASE STM32_USART2_BASE
# define STM32_APBCLOCK STM32_PCLK1_FREQUENCY
# define STM32_CONSOLE_BAUD CONFIG_USART2_BAUD
# define STM32_CONSOLE_BITS CONFIG_USART2_BITS
# define STM32_CONSOLE_PARITY CONFIG_USART2_PARITY
# define STM32_CONSOLE_2STOP CONFIG_USART2_2STOP
#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
# define STM32_CONSOLE_BASE STM32_USART3_BASE
# define STM32_APBCLOCK STM32_PCLK1_FREQUENCY
# define STM32_CONSOLE_BAUD CONFIG_USART3_BAUD
# define STM32_CONSOLE_BITS CONFIG_USART3_BITS
# define STM32_CONSOLE_PARITY CONFIG_USART3_PARITY
# define STM32_CONSOLE_2STOP CONFIG_USART3_2STOP
#else
# error "No CONFIG_USARTn_SERIAL_CONSOLE Setting"
#endif
/* CR1 settings */
#if STM32_CONSOLE_BITS == 9
# define USART_CR1_M_VALUE USART_CR1_M
#else
# define USART_CR1_M_VALUE 0
#endif
#if STM32_CONSOLE_PARITY == 1
# define USART_CR1_PARITY_VALUE (USART_CR1_PCE|USART_CR1_PS)
#elif STM32_CONSOLE_PARITY == 2
# define USART_CR1_PARITY_VALUE USART_CR1_PCE
#else
# define USART_CR1_PARITY_VALUE 0
#endif
#define USART_CR1_CLRBITS (USART_CR1_M|USART_CR1_PCE|USART_CR1_PS|USART_CR1_TE|USART_CR1_RE|USART_CR1_ALLINTS)
#define USART_CR1_SETBITS (USART_CR1_M_VALUE|USART_CR1_PARITY_VALUE)
/* CR2 settings */
#if STM32_CONSOLE_2STOP != 0
# define USART_CR2_STOP2_VALUE USART_CR2_STOP2
#else
# define USART_CR2_STOP2_VALUE 0
#endif
#define USART_CR2_CLRBITS (USART_CR2_STOP_MASK|USART_CR2_CLKEN|USART_CR2_CPOL|USART_CR2_CPHA|USART_CR2_LBCL|USART_CR2_LBDIE)
#define USART_CR2_SETBITS USART_CR2_STOP2_VALUE
/* CR3 settings */
#define USART_CR3_CLRBITS (USART_CR3_CTSIE|USART_CR3_CTSE|USART_CR3_RTSE|USART_CR3_EIE)
#define USART_CR3_SETBITS 0
/* Calculate USART BAUD rate divider
*
* The baud rate for the receiver and transmitter (Rx and Tx) are both set to
* the same value as programmed in the Mantissa and Fraction values of USARTDIV.
*
* baud = fCK / (16 * usartdiv)
* usartdiv = fCK / (16 * baud)
*
* Where fCK is the input clock to the peripheral (PCLK1 for USART2, 3, 4, 5
* or PCLK2 for USART1). Example, fCK=72MHz baud=115200, usartdiv=39.0625=39 1/16th;
*
* First calculate:
*
* usartdiv32 = 32 * usartdiv = fCK / (baud/2)
*
* (NOTE: all standard baud values are even so dividing by two does not
* lose precision). Eg. (same fCK and buad), usartdiv32 = 1250
*/
#define STM32_USARTDIV32 (STM32_APBCLOCK / (STM32_CONSOLE_BAUD >> 1))
/* The mantissa is then usartdiv32 * 32:
*
* mantissa = 32 * usartdiv32
*
* Eg. usartdiv32=1250, mantissa = 39
*/
#define STM32_MANTISSA (STM32_USARTDIV32 >> 5)
/* And the fraction:
*
* fraction = (usartdiv32 - mantissa*32 + 1) / 2
*
* Eg., (1,250 - 39*32 + 1)/2 = 1 (or 0.0625)
*/
#define STM32_FRACTION ((STM32_USARTDIV32 - (STM32_MANTISSA << 5) + 1) >> 1)
/* And, finally, the BRR value is: */
#define STM32_BRR_VALUE ((STM32_MANTISSA << USART_BRR_MANT_SHIFT) | (STM32_FRACTION << USART_BRR_FRAC_SHIFT))
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_lowputc
*
* Description:
* Output one byte on the serial console
*
**************************************************************************/
void up_lowputc(char ch)
{
#ifdef HAVE_CONSOLE
/* Wait until the TX data register is empty */
while ((getreg32(STM32_CONSOLE_BASE + STM32_USART_SR_OFFSET) & USART_SR_TXE) == 0);
/* Then send the character */
putreg32((uint32_t)ch, STM32_CONSOLE_BASE + STM32_USART_DR_OFFSET);
#endif
}
/**************************************************************************
* Name: stm32_lowsetup
*
* Description:
* This performs basic initialization of the USART used for the serial
* console. Its purpose is to get the console output availabe as soon
* as possible.
*
**************************************************************************/
void stm32_lowsetup(void)
{
#if defined(CONFIG_STM32_USART1) || defined(CONFIG_STM32_USART2) || defined(CONFIG_STM32_USART3)
uint32_t mapr;
#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
uint32_t cr;
#endif
/* Enable the selected USARTs and configure GPIO pins need byed the
* the selected USARTs. NOTE: The serial driver later depends on
* this pin configuration -- whether or not a serial console is selected.
*
* NOTE: Clocking for USART1, USART2, and/or USART3 was already provided in stm32_rcc.c
*/
mapr = getreg32(STM32_AFIO_MAPR);
#ifdef CONFIG_STM32_USART1
/* Assume default pin mapping:
*
* Alternate USART1_REMAP USART1_REMAP
* Function = 0 = 1
* ---------- ------------ ------------
* USART1_TX PA9 PB6
* USART1_RX PA10 PB7
*/
#ifdef CONFIG_STM32_USART1_REMAP
mapr |= AFIO_MAPR_USART1_REMAP;
#else
mapr &= ~AFIO_MAPR_USART1_REMAP;
#endif
putreg32(mapr, STM32_AFIO_MAPR);
stm32_configgpio(GPIO_USART1_TX);
stm32_configgpio(GPIO_USART1_RX);
#endif /* CONFIG_STM32_USART1 */
#ifdef CONFIG_STM32_USART2
/* Assume default pin mapping:
*
* Alternate USART2_REMAP USART2_REMAP
* Function = 0 = 1
* ---------- ------------ ------------
* USART2_CTS PA0 PD3
* USART2_RTS PA1 PD4
* USART2_TX PA2 PD5
* USART2_RX PA3 PD6
* USART3_CK PA4 PD7
*/
#ifdef CONFIG_STM32_USART2_REMAP
mapr |= AFIO_MAPR_USART2_REMAP;
#else
mapr &= ~AFIO_MAPR_USART2_REMAP;
#endif
putreg32(mapr, STM32_AFIO_MAPR);
stm32_configgpio(GPIO_USART2_TX);
stm32_configgpio(GPIO_USART2_RX);
stm32_configgpio(GPIO_USART2_CTS);
stm32_configgpio(GPIO_USART2_RTS);
#endif /* CONFIG_STM32_USART2 */
#ifdef CONFIG_STM32_USART3
/* Assume default pin mapping:
*
* Alternate USART3_REMAP[1:0] USART3_REMAP[1:0] USART3_REMAP[1:0]
* Function = “00” (no remap) = “01” (partial remap) = “11” (full remap)
* ---------_ ------------------ ---------------------- --------------------
* USART3_TX PB10 PC10 PD8
* USART3_RX PB11 PC11 PD9
* USART3_CK PB12 PC12 PD10
* USART3_CTS PB13 PB13 PD11
* USART3_RTS PB14 PB14 PD12
*/
mapr &= ~AFIO_MAPR_USART3_REMAP_MASK;
#if defined(CONFIG_STM32_USART3_PARTIAL_REMAP)
mapr |= AFIO_MAPR_USART3_PARTREMAP;
#elif defined(CONFIG_STM32_USART3_FULL_REMAP)
mapr |= AFIO_MAPR_USART3_FULLREMAP;
#endif
putreg32(mapr, STM32_AFIO_MAPR);
stm32_configgpio(GPIO_USART3_TX);
stm32_configgpio(GPIO_USART3_RX);
stm32_configgpio(GPIO_USART3_CTS);
stm32_configgpio(GPIO_USART3_RTS);
#endif /* CONFIG_STM32_USART3 */
/* Enable and configure the selected console device */
#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
/* Configure CR2 */
cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR2_OFFSET);
cr &= ~USART_CR2_CLRBITS;
cr |= USART_CR2_SETBITS;
putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR2_OFFSET);
/* Configure CR1 */
cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET);
cr &= ~USART_CR1_CLRBITS;
cr |= USART_CR1_SETBITS;
putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET);
/* Configure CR3 */
cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR3_OFFSET);
cr &= ~USART_CR3_CLRBITS;
cr |= USART_CR3_SETBITS;
putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR3_OFFSET);
/* Configure the USART Baud Rate */
putreg32(STM32_BRR_VALUE, STM32_CONSOLE_BASE + STM32_USART_BRR_OFFSET);
/* Enable Rx, Tx, and the USART */
cr = getreg32(STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET);
cr |= (USART_CR1_UE|USART_CR1_TE|USART_CR1_RE);
putreg32(cr, STM32_CONSOLE_BASE + STM32_USART_CR1_OFFSET);
#endif
#endif /* CONFIG_STM32_USART1 || CONFIG_STM32_USART2 || CONFIG_STM32_USART3 */
}
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