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apache / nuttx / refs/heads/cmake / . / arch / arm / src / gd32f4 / gd32f4xx_lowputc.c
blob: fde3db1e30e22f22ab29561d0cfaa7d10cd924e4 [file] [log] [blame]
/****************************************************************************
* arch/arm/src/gd32f4/gd32f4xx_lowputc.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <arch/board/board.h>
#include "arm_internal.h"
#include "chip.h"
#include "gd32f4xx.h"
#include "gd32f4xx_rcu.h"
#include "gd32f4xx_gpio.h"
#include "gd32f4xx_usart.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Select USART parameters for the selected console */
#ifdef HAVE_CONSOLE
# if defined(CONFIG_USART0_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_USART0
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB2EN
# define GD32_CONSOLE_APBEN RCU_APB2EN_USART0EN
# define GD32_CONSOLE_CLOCK GD32_PCLK2_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_USART0_BAUD
# define GD32_CONSOLE_PARITY CONFIG_USART0_PARITY
# define GD32_CONSOLE_NBITS CONFIG_USART0_BITS
# define GD32_CONSOLE_2STOP CONFIG_USART0_2STOP
# define GD32_CONSOLE_TX GPIO_USART0_TX
# define GD32_CONSOLE_RX GPIO_USART0_RX
# ifdef CONFIG_USART0_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_USART0_RS485_DIR
# if (CONFIG_USART0_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GDM32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# elif defined(CONFIG_USART1_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_USART1
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB1EN
# define GD32_CONSOLE_APBEN RCU_APB1EN_USART1EN
# define GD32_CONSOLE_CLOCK GD32_PCLK1_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_USART1_BAUD
# define GD32_CONSOLE_PARITY CONFIG_USART1_PARITY
# define GD32_CONSOLE_NBITS CONFIG_USART1_BITS
# define GD32_CONSOLE_2STOP CONFIG_USART1_2STOP
# define GD32_CONSOLE_TX GPIO_USART1_TX
# define GD32_CONSOLE_RX GPIO_USART1_RX
# ifdef CONFIG_USART1_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_USART1_RS485_DIR
# if (CONFIG_USART1_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GD32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_USART2
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB1EN
# define GD32_CONSOLE_APBEN RCU_APB1ENR_USART3EN
# define GD32_CONSOLE_CLOCK GD32_PCLK1_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_USART2_BAUD
# define GD32_CONSOLE_PARITY CONFIG_USART2_PARITY
# define GD32_CONSOLE_NBITS CONFIG_USART2_BITS
# define GD32_CONSOLE_2STOP CONFIG_USART2_2STOP
# define GD32_CONSOLE_TX GPIO_USART2_TX
# define GD32_CONSOLE_RX GPIO_USART2_RX
# ifdef CONFIG_USART2_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_USART2_RS485_DIR
# if (CONFIG_USART2_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GD32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# elif defined(CONFIG_UART3_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_UART3
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB1EN
# define GD32_CONSOLE_APBEN RCU_APB1EN_UART3EN
# define GD32_CONSOLE_CLOCK GD32_PCLK1_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_UART3_BAUD
# define GD32_CONSOLE_PARITY CONFIG_UART3_PARITY
# define GD32_CONSOLE_NBITS CONFIG_UART3_BITS
# define GD32_CONSOLE_2STOP CONFIG_UART3_2STOP
# define GD32_CONSOLE_TX GPIO_UART3_TX
# define GD32_CONSOLE_RX GPIO_UART3_RX
# ifdef CONFIG_UART3_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_UART3_RS485_DIR
# if (CONFIG_UART3_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GD32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# elif defined(CONFIG_UART4_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_UART4
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB1EN
# define GD32_CONSOLE_APBEN RCU_APB1EN_UART4EN
# define GD32_CONSOLE_CLOCK GD32_PCLK1_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_UART4_BAUD
# define GD32_CONSOLE_PARITY CONFIG_UART4_PARITY
# define GD32_CONSOLE_NBITS CONFIG_UART4_BITS
# define GD32_CONSOLE_2STOP CONFIG_UART4_2STOP
# define GD32_CONSOLE_TX GPIO_UART4_TX
# define GD32_CONSOLE_RX GPIO_UART4_RX
# ifdef CONFIG_UART4_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_UART4_RS485_DIR
# if (CONFIG_UART4_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GD32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# elif defined(CONFIG_USART5_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_USART5
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB2EN
# define GD32_CONSOLE_APBEN RCU_APB2EN_USART5EN
# define GD32_CONSOLE_CLOCK GD32_PCLK2_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_USART5_BAUD
# define GD32_CONSOLE_PARITY CONFIG_USART5_PARITY
# define GD32_CONSOLE_NBITS CONFIG_USART5_BITS
# define GD32_CONSOLE_2STOP CONFIG_USART5_2STOP
# define GD32_CONSOLE_TX GPIO_USART5_TX
# define GD32_CONSOLE_RX GPIO_USART5_RX
# ifdef CONFIG_USART5_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_USART5_RS485_DIR
# if (CONFIG_USART5_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GD32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# elif defined(CONFIG_UART6_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_UART6
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB1EN
# define GD32_CONSOLE_APBEN RCU_APB1EN_UART6EN
# define GD32_CONSOLE_CLOCK GD32_PCLK1_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_UART6_BAUD
# define GD32_CONSOLE_PARITY CONFIG_UART6_PARITY
# define GD32_CONSOLE_NBITS CONFIG_UART6_BITS
# define GD32_CONSOLE_2STOP CONFIG_UART6_2STOP
# define GD32_CONSOLE_TX GPIO_UART6_TX
# define GD32_CONSOLE_RX GPIO_UART6_RX
# ifdef CONFIG_UART6_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_UART6_RS485_DIR
# if (CONFIG_UART6_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GD32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# elif defined(CONFIG_UART7_SERIAL_CONSOLE)
# define GD32_CONSOLE_BASE GD32_UART7
# define GD32_CONSOLE_APBEN_REG GD32_RCU_APB1EN
# define GD32_CONSOLE_APBEN RCU_APB1ENR_UART7EN
# define GD32_CONSOLE_CLOCK GD32_PCLK1_FREQUENCY
# define GD32_CONSOLE_BAUD CONFIG_UART7_BAUD
# define GD32_CONSOLE_PARITY CONFIG_UART7_PARITY
# define GD32_CONSOLE_NBITS CONFIG_UART7_BITS
# define GD32_CONSOLE_2STOP CONFIG_UART7_2STOP
# define GD32_CONSOLE_TX GPIO_UART7_TX
# define GD32_CONSOLE_RX GPIO_UART7_RX
# ifdef CONFIG_UART7_RS485
# define GD32_CONSOLE_RS485_DIR GPIO_UART7_RS485_DIR
# if (CONFIG_UART7_RS485_DIR_POLARITY == 0)
# define GD32_CONSOLE_RS485_DIR_POLARITY false
# else
# define GD32_CONSOLE_RS485_DIR_POLARITY true
# endif
# endif
# endif
/* CTL0 settings */
# if GD32_CONSOLE_NBITS == 9
# define USART_CTL0_WL_VALUE USART_WL_9BIT
# else
# define USART_CTL0_WL_VALUE USART_WL_8BIT
# endif
# if GD32_CONSOLE_PARITY == 1
# define USART_CTL0_PARITY_VALUE USART_CTL0_PM_ODD
# elif GD32_CONSOLE_PARITY == 2
# define USART_CTL0_PARITY_VALUE USART_CTL0_PM_EVEN
# else
# define USART_CTL0_PARITY_VALUE USART_CTL0_PM_NONE
# endif
/* CTL1 settings */
# if GD32_CONSOLE_2STOP != 0
# define USART_USART_CTL1_STB2BIT_VALUE USART_CTL1_STB2BIT
# else
# define USART_USART_CTL1_STB2BIT_VALUE USART_CTL1_STB1BIT
# endif
#endif /* HAVE_CONSOLE */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: arm_lowputc
*
* Description:
* Output one byte on the serial console
*
****************************************************************************/
void arm_lowputc(char ch)
{
#if defined (HAVE_CONSOLE)
/* Wait until the transmit data register is empty */
while ((getreg32(GD32_CONSOLE_BASE + GD32_USART_STAT0_OFFSET) &
USART_STAT0_TBE) == 0);
#ifdef GD32_CONSOLE_RS485_DIR
gd32_gpio_write(GD32_CONSOLE_RS485_DIR,
GD32_CONSOLE_RS485_DIR_POLARITY);
#endif
/* Then send the character */
putreg32((uint32_t)(ch & USART_DATA_MASK), GD32_CONSOLE_BASE +
GD32_USART_DATA_OFFSET);
#ifdef GD32_CONSOLE_RS485_DIR
while ((getreg32(GD32_CONSOLE_BASE + GD32_USART_STAT0_OFFSET) &
USART_STAT0_TC) == 0);
gd32_gpio_write(GD32_CONSOLE_RS485_DIR,
!GD32_CONSOLE_RS485_DIR_POLARITY);
#endif
#endif /* HAVE_CONSOLE */
}
/****************************************************************************
* Name: gd32_lowsetup
*
* Description:
* This performs basic initialization of the USART used for the serial
* console. Its purpose is to get the console output available as soon
* as possible.
*
****************************************************************************/
void gd32_lowsetup(void)
{
#if defined(HAVE_SERIALDRIVER)
#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
uint32_t regval;
uint32_t udiv;
uint32_t intdiv;
uint32_t fradiv;
#endif
#if defined(HAVE_CONSOLE)
/* Enable USART APB1/2 clock */
modifyreg32(GD32_CONSOLE_APBEN_REG, 0, GD32_CONSOLE_APBEN);
#endif
/* Enable the console USART and configure TX, RX pins. */
#ifdef GD32_CONSOLE_TX
gd32_gpio_config(GD32_CONSOLE_TX);
#endif
#ifdef GD32_CONSOLE_RX
gd32_gpio_config(GD32_CONSOLE_RX);
#endif
#ifdef GD32_CONSOLE_RS485_DIR
gd32_gpio_config(GD32_CONSOLE_RS485_DIR);
gd32_gpio_write(GD32_CONSOLE_RS485_DIR,
!GD32_CONSOLE_RS485_DIR_POLARITY);
#endif
/* Enable and configure the selected console device */
#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
/* Reset USART */
gd32_usart_reset(GD32_CONSOLE_BASE);
/* Enable USART clock */
gd32_usart_clock_enable(GD32_CONSOLE_BASE);
/* Disabled the USART before to configure it. */
regval = getreg32(GD32_CONSOLE_BASE + GD32_USART_CTL0_OFFSET);
regval &= ~USART_CTL0_UEN;
putreg32(regval, GD32_CONSOLE_BASE + GD32_USART_CTL0_OFFSET);
/* Configure CTL0 */
regval = getreg32(GD32_CONSOLE_BASE + GD32_USART_CTL0_OFFSET);
regval |= (USART_CTL0_WL_VALUE | USART_CTL0_PARITY_VALUE);
putreg32(regval, GD32_CONSOLE_BASE + GD32_USART_CTL0_OFFSET);
/* Configure CTL1 */
regval = getreg32(GD32_CONSOLE_BASE + GD32_USART_CTL1_OFFSET);
regval |= USART_USART_CTL1_STB2BIT_VALUE;
putreg32(regval, GD32_CONSOLE_BASE + GD32_USART_CTL1_OFFSET);
/* Configure USART baud rate value */
regval = getreg32(GD32_CONSOLE_BASE + GD32_USART_CTL0_OFFSET);
if ((regval & USART_CTL0_OVSMOD) == USART_OVSMOD_8)
{
/* When oversampling by 8, configure the value of USART_BAUD */
udiv = ((GD32_CONSOLE_CLOCK * 2) + GD32_CONSOLE_BAUD / 2) /
GD32_CONSOLE_BAUD;
intdiv = udiv & 0xfff0;
fradiv = (udiv >> 1) & 0x7u;
}
else
{
/* When oversampling by 16, configure the value of USART_BAUD */
udiv = (GD32_CONSOLE_CLOCK + GD32_CONSOLE_BAUD / 2) /
GD32_CONSOLE_BAUD;
intdiv = udiv & 0xfff0;
fradiv = udiv & 0xf;
}
regval = ((USART_BAUD_FRADIV_MASK | USART_BAUD_INTDIV_MASK) &
(intdiv | fradiv));
putreg32(regval, GD32_CONSOLE_BASE + GD32_USART_BAUD_OFFSET);
/* Enable Rx, Tx, and the USART */
regval = getreg32(GD32_CONSOLE_BASE + GD32_USART_CTL0_OFFSET);
regval |= (USART_CTL0_UEN | USART_CTL0_TEN | USART_CTL0_REN);
putreg32(regval, GD32_CONSOLE_BASE + GD32_USART_CTL0_OFFSET);
#endif /* HAVE_CONSOLE && !CONFIG_SUPPRESS_UART_CONFIG */
#endif /* HAVE_SERIALDRIVER */
}
/****************************************************************************
* Name: gd32_usart_reset
*
* Description:
* Reset the USART.
*
****************************************************************************/
void gd32_usart_reset(uint32_t usartbase)
{
uint32_t rcu_rst;
uint32_t regaddr;
/* Determine which USART to configure */
switch (usartbase)
{
default:
return;
#ifdef CONFIG_GD32F4_USART0_SERIALDRIVER
case GD32_USART0:
rcu_rst = RCU_APB2RST_USART0RST;
regaddr = GD32_RCU_APB2RST;
break;
#endif
#ifdef CONFIG_GD32F4_USART1_SERIALDRIVER
case GD32_USART1:
rcu_rst = RCU_APB1RST_USART1RST;
regaddr = GD32_RCU_APB1RST;
break;
#endif
#ifdef CONFIG_GD32F4_USART2_SERIALDRIVER
case GD32_USART2:
rcu_rst = RCU_APB1RST_USART2RST;
regaddr = GD32_RCU_APB1RST;
break;
#endif
#ifdef CONFIG_GD32F4_UART3_SERIALDRIVER
case GD32_UART3:
rcu_rst = RCU_APB1RST_UART3RST;
regaddr = GD32_RCU_APB1RST;
break;
#endif
#ifdef CONFIG_GD32F4_UART4_SERIALDRIVER
case GD32_UART4:
rcu_rst = RCU_APB1RST_UART4RST;
regaddr = GD32_RCU_APB1RST;
break;
#endif
#ifdef CONFIG_GD32F4_USART5_SERIALDRIVER
case GD32_USART5:
rcu_rst = RCU_APB2RST_USART5RST;
regaddr = GD32_RCU_APB2RST;
break;
#endif
#ifdef CONFIG_GD32F4_UART6_SERIALDRIVER
case GD32_UART6:
rcu_rst = RCU_APB1RST_UART6RST;
regaddr = GD32_RCU_APB1RST;
break;
#endif
#ifdef CONFIG_GD32F4_UART7_SERIALDRIVER
case GD32_UART7:
rcu_rst = RCU_APB1RST_UART7RST;
regaddr = GD32_RCU_APB1RST;
break;
#endif
}
/* Enable APB 1/2 reset for USART */
modifyreg32(regaddr, 0, rcu_rst);
/* Disable APB 1/2 reset for USART */
modifyreg32(regaddr, rcu_rst, 0);
}
/****************************************************************************
* Name: gd32_usart_clock_enable
*
* Description:
* Enable USART clock
****************************************************************************/
void gd32_usart_clock_enable(uint32_t usartbase)
{
uint32_t rcu_en;
uint32_t regaddr;
/* Determine which USART to configure */
switch (usartbase)
{
default:
return;
#ifdef CONFIG_GD32F4_USART0_SERIALDRIVER
case GD32_USART0:
rcu_en = RCU_APB2EN_USART0EN;
regaddr = GD32_RCU_APB2EN;
break;
#endif
#ifdef CONFIG_GD32F4_USART1_SERIALDRIVER
case GD32_USART1:
rcu_en = RCU_APB1EN_USART1EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_USART2_SERIALDRIVER
case GD32_USART2:
rcu_en = RCU_APB1EN_USART2EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART3_SERIALDRIVER
case GD32_UART3:
rcu_en = RCU_APB1EN_UART3EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART4_SERIALDRIVER
case GD32_UART4:
rcu_en = RCU_APB1EN_UART4EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_USART5_SERIALDRIVER
case GD32_USART5:
rcu_en = RCU_APB2EN_USART5EN;
regaddr = GD32_RCU_APB2EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART6_SERIALDRIVER
case GD32_UART6:
rcu_en = RCU_APB1EN_UART6EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART7_SERIALDRIVER
case GD32_UART7:
rcu_en = RCU_APB1EN_UART7EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
}
/* Enable APB 1/2 clock for USART */
modifyreg32(regaddr, 0, rcu_en);
}
/****************************************************************************
* Name: gd32_usart_clock_disable
*
* Description:
* Dinable USART clock
****************************************************************************/
void gd32_usart_clock_disable(uint32_t usartbase)
{
uint32_t rcu_en;
uint32_t regaddr;
/* Determine which USART to configure */
switch (usartbase)
{
default:
return;
#ifdef CONFIG_GD32F4_USART0_SERIALDRIVER
case GD32_USART0:
rcu_en = RCU_APB2EN_USART0EN;
regaddr = GD32_RCU_APB2EN;
break;
#endif
#ifdef CONFIG_GD32F4_USART1_SERIALDRIVER
case GD32_USART1:
rcu_en = RCU_APB1EN_USART1EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_USART2_SERIALDRIVER
case GD32_USART2:
rcu_en = RCU_APB1EN_USART2EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART3_SERIALDRIVER
case GD32_UART3:
rcu_en = RCU_APB1EN_UART3EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART4_SERIALDRIVER
case GD32_UART4:
rcu_en = RCU_APB1EN_UART4EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_USART5_SERIALDRIVER
case GD32_USART5:
rcu_en = RCU_APB2EN_USART5EN;
regaddr = GD32_RCU_APB2EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART6_SERIALDRIVER
case GD32_UART6:
rcu_en = RCU_APB1EN_UART6EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
#ifdef CONFIG_GD32F4_UART7_SERIALDRIVER
case GD32_UART7:
rcu_en = RCU_APB1EN_UART7EN;
regaddr = GD32_RCU_APB1EN;
break;
#endif
}
/* Disable APB 1/2 clock for USART */
modifyreg32(regaddr, rcu_en, 0);
}