MSP432 串口通信

MSP432P401R基础使用

四、串口收发

（一）MSP432P401R串口资源

详见msp432p401r第6页

A0的串口是通过跳线帽连接到调试器上的

开发板手册（slau597f）第38页

（二）UART模式的特性

• 7/8个数据位、1个奇/偶/无奇偶效验位
• 独立的发送和接收移位寄存器
• 独立的发送和接收缓冲寄存器
• LSP优先/MSB优先的数据发送和接收
• 为多处理器系统内置空闲线和地址位通信协议
• 支持分数波特率的可编程调制波特率
• 用于错误检测和抑制的状态标志
• 针对地址检测的状态标志
• 针对接收、发送，起始位接收和发送完成的独立中断能力

数据手册（slau356）第904页

（三）库函数

1.uart.h

• 初始化串口函数

  UART_initModule(EUSCI_Ax_BASE, &uartConfig);
  

• 使能串口模块

  UART_enableModule(EUSCI_Ax_BASE);
  

• 开启串口相关中断

  UART_enableInterrupt(EUSCI_Ax_BASE, EUSCI_x_INTERRUPT);
  

• 获取数据

  UART_receiveData(EUSCI_Ax_BASE)；
  

• 发送数据

  UART_transmitData(EUSCI_Ax_BASE，Data_8bit）；
  

• 开启串口端口中断

  Interrupt_enableInterrupt(INT_EUSCIAx);
  

• 开启总中断

  Interrupt_enableMaster(void);
  

（四）一般配置步骤

1. 配置时钟
2. 配置GPIO复用
3. 配置结构体
4. 初始化串口
5. 开启串口
6. 开启串口相关中断
7. 开启串口端口中断
8. 开启总中断
9. 编写UART ISR

（五）代码

usart.h

/****************************************************/
// MSP432P401R
// 串口配置
// Bilibili：m-RNA
// E-mail:[email protected]
/****************************************************/

/******************   版本更新说明   *****************
 * 
 * CCS支持printf
 * Keil支持标准C库跟微库
 * 用Keil开发终于可以不开微库啦
 * 
 * ? 需要注意：
 * ①使用标准C库时，将无法使用scanf。
 * 如果需要使用scanf时，请使用微库 MicroLIB
 * ①低频时钟频率下，高波特率使得传输时误差过大,
 * 比如35768Hz下19200波特率,
 * 会使得传输出错，这时可以尝试降低波特率。
 * ②baudrate_calculate的问题请去文件内查看。
 * 
 * **************************************************
 * 
 * ? v3.2  2021/10/28
 * 简化对CCS支持的printf代码
 *
 * ? v3.1  2021/10/18
 * 添加对CCS的printf支持
 *
 * ? v3.0  2021/10/15
 * 此版本支持使用 标准C库
 * 文件正式改名为与正点原子同名的
 * usart.c 和 usart.h，方便移植
 * 仅支持Keil平台开发
 *  
 * ? v2.1  2021/8/27
 * 添加支持固件库v3_21_00_05
 * 仅支持 MicroLIB 微库、Keil平台开发
 * 
 * ? v2.0  2021/8/25
 * uart_init增添了波特率传入参数，可直接配置波特率。
 * 计算UART的代码单独打包为名为
 * baudrate_calculate的c文件和h文件
 * 仅支持 MicroLIB 微库、Keil平台开发
 * 
 * ? v1.0 2021/7/17
 * 仅支持固件库v3_40_01_02
 * 配置了SMCLK 48MHz 波特率 115200的初始化代码，
 * 对接标准输入输出库，使其能使用printf、scanf函数
 * 仅支持 MicroLIB 微库、Keil平台开发
 * 
 ****************************************************/

#ifndef __USART_H
#define __USART_H
#include "driverlib.h"
#include "stdio.h" //1.61328125kb

#ifdef __TI_COMPILER_VERSION__
//CCS平台
#include "stdarg.h"
#include "string.h"
#define USART0_MAX_SEND_LEN     600                 //最大发送缓存字节数
int printf(const char *str, ...);
#endif

void uart_init(uint32_t baudRate);

#endif

usart.c

/****************************************************/
// MSP432P401R
// 串口配置
// Bilibili：m-RNA
// E-mail:[email protected]
/****************************************************/

/******************   版本更新说明   *****************
 * 
 * CCS支持printf
 * Keil支持标准C库跟微库
 * 用Keil开发终于可以不开微库啦
 * 
 * ? 需要注意：
 * ①使用标准C库时，将无法使用scanf。
 * 如果需要使用scanf时，请使用微库 MicroLIB
 * ①低频时钟频率下，高波特率使得传输时误差过大,
 * 比如35768Hz下19200波特率,
 * 会使得传输出错，这时可以尝试降低波特率。
 * ②baudrate_calculate的问题请去文件内查看。
 * 
 * **************************************************
 * 
 * ? v3.2  2021/10/28
 * 简化对CCS支持的printf代码
 *
 * ? v3.1  2021/10/18
 * 添加对CCS的printf支持
 *
 * ? v3.0  2021/10/15
 * 此版本支持使用 标准C库
 * 文件正式改名为与正点原子同名的
 * usart.c 和 usart.h，方便移植
 * 仅支持Keil平台开发
 *  
 * ? v2.1  2021/8/27
 * 添加支持固件库v3_21_00_05
 * 仅支持 MicroLIB 微库、Keil平台开发
 * 
 * ? v2.0  2021/8/25
 * uart_init增添了波特率传入参数，可直接配置波特率。
 * 计算UART的代码单独打包为名为
 * baudrate_calculate的c文件和h文件
 * 仅支持 MicroLIB 微库、Keil平台开发
 * 
 * ? v1.0 2021/7/17
 * 仅支持固件库v3_40_01_02
 * 配置了SMCLK 48MHz 波特率 115200的初始化代码，
 * 对接标准输入输出库，使其能使用printf、scanf函数
 * 仅支持 MicroLIB 微库、Keil平台开发
 * 
 ****************************************************/

#include "usart.h"
#include "baudrate_calculate.h"

#ifdef __TI_COMPILER_VERSION__
//CCS平台
uint8_t  USART0_TX_BUF[USART0_MAX_SEND_LEN];             //发送缓冲,最大USART3_MAX_SEND_LEN字节
int printf(const char *str, ...)
{
    uint16_t i,j;
    va_list ap;
    va_start(ap,str);
    vsprintf((char*)USART0_TX_BUF,str,ap);
    va_end(ap);
    i=strlen((const char*)USART0_TX_BUF);       //此次发送数据的长度
    for(j=0;j<i;j++)                            //循环发送数据
    {
      //while(USART_GetFlagStatus(USART3,USART_FLAG_TC)==RESET); //循环发送,直到发送完毕
        UART_transmitData(EUSCI_A0_BASE, USART0_TX_BUF[j]);
    }
    return 0;
}
/*****************   函数说明   *****************
 *
 * 函数：int printf(const char *str, ...);
 * 源码来自@正点原子
 * 稍作改动适配CCS工程，在此也表感谢正点原子。
 *
 *****************   说明结束   *****************/

#else
//Keil支持标准C库跟微库
//预编译
//if 1 使用标准C库 如果报错就使用微库
//if 0 使用微库 得去勾选魔术棒里的 Use MicroLIB
#if 1
#pragma import(__use_no_semihosting)
//标准库需要的支持函数
struct __FILE
{
  int handle;
};
FILE __stdout;
//定义_sys_exit()以避免使用半主机模式
void _sys_exit(int x)
{
  x = x;
}
#else
int fgetc(FILE *f)
{
  while (EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG !=
         UART_getInterruptStatus(EUSCI_A0_BASE, EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG))
    ;
  return UART_receiveData(EUSCI_A0_BASE);
}
#endif
int fputc(int ch, FILE *f)
{
  UART_transmitData(EUSCI_A0_BASE, ch & 0xFF);
  return ch;
}
/*****************   函数说明   *****************
 *
 * 以上两条对接标准输入输出库的函数:
 * int fputc(int ch, FILE *f);
 * int fgetc(FILE *f);
 * 源码为BiliBili平台UP主 “CloudBoyStudio” 编写
 * 本人RNA，不是作者
 * 在此也表感谢
 *
 *****************   说明结束   *****************/
#endif

void uart_init(uint32_t baudRate)
{
#ifdef EUSCI_A_UART_7_BIT_LEN
  //固件库v3_40_01_02
  //默认SMCLK 48MHz 比特率 115200
  const eUSCI_UART_ConfigV1 uartConfig =
      {
          EUSCI_A_UART_CLOCKSOURCE_SMCLK,                // SMCLK Clock Source
          26,                                            // BRDIV = 26
          0,                                             // UCxBRF = 0
          111,                                           // UCxBRS = 111
          EUSCI_A_UART_NO_PARITY,                        // No Parity
          EUSCI_A_UART_LSB_FIRST,                        // MSB First
          EUSCI_A_UART_ONE_STOP_BIT,                     // One stop bit
          EUSCI_A_UART_MODE,                             // UART mode
          EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION, // Oversampling
          EUSCI_A_UART_8_BIT_LEN                         // 8 bit data length
      };
  eusci_calcBaudDividers((eUSCI_UART_ConfigV1 *)&uartConfig, baudRate); //配置波特率
#else
  //固件库v3_21_00_05
  //默认SMCLK 48MHz 比特率 115200
  const eUSCI_UART_Config uartConfig =
      {
          EUSCI_A_UART_CLOCKSOURCE_SMCLK,                // SMCLK Clock Source
          26,                                            // BRDIV = 26
          0,                                             // UCxBRF = 0
          111,                                           // UCxBRS = 111
          EUSCI_A_UART_NO_PARITY,                        // No Parity
          EUSCI_A_UART_LSB_FIRST,                        // MSB First
          EUSCI_A_UART_ONE_STOP_BIT,                     // One stop bit
          EUSCI_A_UART_MODE,                             // UART mode
          EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION, // Oversampling
      };
  eusci_calcBaudDividers((eUSCI_UART_Config *)&uartConfig, baudRate); //配置波特率
#endif

  MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P1, GPIO_PIN2 | GPIO_PIN3, GPIO_PRIMARY_MODULE_FUNCTION);//2.配置GPIO复用
  MAP_UART_initModule(EUSCI_A0_BASE, &uartConfig);//3.初始化串口
  MAP_UART_enableModule(EUSCI_A0_BASE);//4.开启串口模块
	UART_enableInterrupt(EUSCI_A0_BASE, EUSCI_A_UART_RECEIVE_INTERRUPT);//5.开启串口相关中断
	Interrupt_enableInterrupt(INT_EUSCIA0);//6.开启串口端口中断
	Interrupt_enableMaster();//7.开启总中断
}

//8.编写UART ISR
void EUSCIA0_IRQHandler(void)
{
    uint32_t status = UART_getEnabledInterruptStatus(EUSCI_A0_BASE);

    if(status & EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG) //接收中断
    {
        UART_transmitData(EUSCI_A0_BASE, MAP_UART_receiveData(EUSCI_A0_BASE)); //发送数据
    }

}

sysinit.h

/* --COPYRIGHT--,BSD
 * Copyright (c) 2017, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  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.
 *
 * *  Neither the name of Texas Instruments Incorporated 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.
 * --/COPYRIGHT--*/
#ifndef __SYSCTL_H__
#define __SYSCTL_H__

#include 
#include "driverlib.h"

/* Define to ensure that our current MSP432 has the SYSCTL module. This
    definition is included in the device specific header file */
#ifdef __MCU_HAS_SYSCTL__

//*****************************************************************************
//
//! \addtogroup sysctl_api
//! @{
//
//*****************************************************************************

//*****************************************************************************
//
// If building with a C++ compiler, make all of the definitions in this header
// have a C binding.
//
//*****************************************************************************
#ifdef __cplusplus
extern "C"
{
#endif

//*****************************************************************************
//
// Control specific variables
//
//*****************************************************************************
#define SYSCTL_SRAM_BANK7 SYSCTL_SRAM_BANKEN_BNK7_EN
#define SYSCTL_SRAM_BANK6 SYSCTL_SRAM_BANKEN_BNK6_EN
#define SYSCTL_SRAM_BANK5 SYSCTL_SRAM_BANKEN_BNK5_EN
#define SYSCTL_SRAM_BANK4 SYSCTL_SRAM_BANKEN_BNK4_EN
#define SYSCTL_SRAM_BANK3 SYSCTL_SRAM_BANKEN_BNK3_EN
#define SYSCTL_SRAM_BANK2 SYSCTL_SRAM_BANKEN_BNK2_EN
#define SYSCTL_SRAM_BANK1 SYSCTL_SRAM_BANKEN_BNK1_EN

#define SYSCTL_HARD_RESET 1
#define SYSCTL_SOFT_RESET 0

#define SYSCTL_PERIPH_DMA SYSCTL_PERIHALT_CTL_HALT_DMA
#define SYSCTL_PERIPH_WDT SYSCTL_PERIHALT_CTL_HALT_WDT
#define SYSCTL_PERIPH_ADC SYSCTL_PERIHALT_CTL_HALT_ADC
#define SYSCTL_PERIPH_EUSCIB3 SYSCTL_PERIHALT_CTL_HALT_EUB3
#define SYSCTL_PERIPH_EUSCIB2 SYSCTL_PERIHALT_CTL_HALT_EUB2
#define SYSCTL_PERIPH_EUSCIB1 SYSCTL_PERIHALT_CTL_HALT_EUB1
#define SYSCTL_PERIPH_EUSCIB0 SYSCTL_PERIHALT_CTL_HALT_EUB0
#define SYSCTL_PERIPH_EUSCIA3 SYSCTL_PERIHALT_CTL_HALT_EUA3
#define SYSCTL_PERIPH_EUSCIA2 SYSCTL_PERIHALT_CTL_HALT_EUA2
#define SYSCTL_PERIPH_EUSCIA1 SYSCTL_PERIHALT_CTL_HALT_EUA1
#define SYSCTL_PERIPH_EUSCIA0 SYSCTL_PERIHALT_CTL_HALT_EUA0
#define SYSCTL_PERIPH_TIMER32_0_MODULE SYSCTL_PERIHALT_CTL_HALT_T32_0
#define SYSCTL_PERIPH_TIMER16_3 SYSCTL_PERIHALT_CTL_HALT_T16_3
#define SYSCTL_PERIPH_TIMER16_2 SYSCTL_PERIHALT_CTL_HALT_T16_2
#define SYSCTL_PERIPH_TIMER16_1 SYSCTL_PERIHALT_CTL_HALT_T16_1
#define SYSCTL_PERIPH_TIMER16_0 SYSCTL_PERIHALT_CTL_HALT_T16_0

#define SYSCTL_NMIPIN_SRC SYSCTL_NMI_CTLSTAT_PIN_SRC
#define SYSCTL_PCM_SRC SYSCTL_NMI_CTLSTAT_PCM_SRC
#define SYSCTL_PSS_SRC SYSCTL_NMI_CTLSTAT_PSS_SRC
#define SYSCTL_CS_SRC SYSCTL_NMI_CTLSTAT_CS_SRC

#define SYSCTL_REBOOT_KEY   0x6900

#define SYSCTL_1_2V_REF        (uint32_t)&TLV->ADC14_REF1P2V_TS30C - (uint32_t)TLV_BASE
#define SYSCTL_1_45V_REF       (uint32_t)&TLV->ADC14_REF1P45V_TS30C - (uint32_t)TLV_BASE
#define SYSCTL_2_5V_REF        (uint32_t)&TLV->ADC14_REF2P5V_TS30C - (uint32_t)TLV_BASE

#define SYSCTL_85_DEGREES_C    4
#define SYSCTL_30_DEGREES_C    0


#define TLV_START               0x00201004
#define TLV_TAG_RESERVED1      1
#define TLV_TAG_RESERVED2      2
#define TLV_TAG_CS             3
#define TLV_TAG_FLASHCTL       4
#define TLV_TAG_ADC14          5
#define TLV_TAG_RESERVED6      6
#define TLV_TAG_RESERVED7      7
#define TLV_TAG_REF            8
#define TLV_TAG_RESERVED9      9
#define TLV_TAG_RESERVED10     10
#define TLV_TAG_DEVINFO        11
#define TLV_TAG_DIEREC         12
#define TLV_TAG_RANDNUM        13
#define TLV_TAG_RESERVED14     14
#define TLV_TAG_BSL            15
#define TLV_TAGEND             0x0BD0E11D

//*****************************************************************************
//
// Structures for TLV definitions
//
//*****************************************************************************
typedef struct
{
    uint32_t    maxProgramPulses;
    uint32_t    maxErasePulses;
} SysCtl_FlashTLV_Info;

typedef struct
{
    uint32_t rDCOIR_FCAL_RSEL04;
    uint32_t rDCOIR_FCAL_RSEL5;
    uint32_t rDCOIR_MAXPOSTUNE_RSEL04;
    uint32_t rDCOIR_MAXNEGTUNE_RSEL04;
    uint32_t rDCOIR_MAXPOSTUNE_RSEL5;
    uint32_t rDCOIR_MAXNEGTUNE_RSEL5;
    uint32_t rDCOIR_CONSTK_RSEL04;
    uint32_t rDCOIR_CONSTK_RSEL5;
    uint32_t rDCOER_FCAL_RSEL04;
    uint32_t rDCOER_FCAL_RSEL5;
    uint32_t rDCOER_MAXPOSTUNE_RSEL04;
    uint32_t rDCOER_MAXNEGTUNE_RSEL04;
    uint32_t rDCOER_MAXPOSTUNE_RSEL5;
    uint32_t rDCOER_MAXNEGTUNE_RSEL5;
    uint32_t rDCOER_CONSTK_RSEL04;
    uint32_t rDCOER_CONSTK_RSEL5;

} SysCtl_CSCalTLV_Info;

//*****************************************************************************
//
// Prototypes for the APIs.
//
//*****************************************************************************

//*****************************************************************************
//
//! Gets the size of the SRAM.
//!
//! \return The total number of bytes of SRAM.
//
//*****************************************************************************
extern uint_least32_t SysCtl_getSRAMSize(void);

//*****************************************************************************
//
//! Gets the size of the flash.
//!
//! \return The total number of bytes of flash.
//
//*****************************************************************************
extern uint_least32_t SysCtl_getFlashSize(void);

//*****************************************************************************
//
//! Reboots the device and causes the device to re-initialize itself.
//!
//! \return This function does not return.
//
//*****************************************************************************
extern void SysCtl_rebootDevice(void);

//*****************************************************************************
//
//! The TLV structure uses a tag or base address to identify segments of the
//! table where information is stored. Some examples of TLV tags are Peripheral
//! Descriptor, Interrupts, Info Block and Die Record. This function retrieves
//! the value of a tag and the length of the tag.
//!
//! \param tag represents the tag for which the information needs to be
//!        retrieved.
//!        Valid values are:
//!        - \b TLV_TAG_RESERVED1
//!        - \b TLV_TAG_RESERVED2
//!        - \b TLV_TAG_CS
//!        - \b TLV_TAG_FLASHCTL
//!        - \b TLV_TAG_ADC14
//!        - \b TLV_TAG_RESERVED6
//!        - \b TLV_TAG_RESERVED7
//!        - \b TLV_TAG_REF
//!        - \b TLV_TAG_RESERVED9
//!        - \b TLV_TAG_RESERVED10
//!        - \b TLV_TAG_DEVINFO
//!        - \b TLV_TAG_DIEREC
//!        - \b TLV_TAG_RANDNUM
//!        - \b TLV_TAG_RESERVED14
//! \param instance In some cases a specific tag may have more than one
//!        instance. For example there may be multiple instances of timer
//!        calibration data present under a single Timer Cal tag. This variable
//!        specifies the instance for which information is to be retrieved (0,
//!        1, etc.). When only one instance exists; 0 is passed.
//! \param length Acts as a return through indirect reference. The function
//!        retrieves the value of the TLV tag length. This value is pointed to
//!        by *length and can be used by the application level once the
//!        function is called. If the specified tag is not found then the
//!        pointer is null 0.
//! \param data_address acts as a return through indirect reference. Once the
//!        function is called data_address points to the pointer that holds the
//!        value retrieved from the specified TLV tag. If the specified tag is
//!        not found then the pointer is null 0.
//!
//! \return None
//
//*****************************************************************************
extern void SysCtl_getTLVInfo(uint_fast8_t tag, uint_fast8_t instance,
        uint_fast8_t *length, uint32_t **data_address);

//*****************************************************************************
//
//! Enables a set of banks in the SRAM. This can be used to optimize power
//! consumption when every SRAM bank isn't needed. It is important to note
//! that when a  higher bank is enabled, all of the SRAM banks below that bank
//! are also enabled. For example, if the user enables SYSCTL_SRAM_BANK7,
//! the banks SYSCTL_SRAM_BANK1 through SYSCTL_SRAM_BANK7 will be enabled
//! (SRAM_BANK0 is reserved and always enabled).
//!
//! \param sramBank The SRAM bank tier to enable.
//!        Must be only one of the following values:
//!                 - \b SYSCTL_SRAM_BANK1,
//!                 - \b SYSCTL_SRAM_BANK2,
//!                 - \b SYSCTL_SRAM_BANK3,
//!                 - \b SYSCTL_SRAM_BANK4,
//!                 - \b SYSCTL_SRAM_BANK5,
//!                 - \b SYSCTL_SRAM_BANK6,
//!                 - \b SYSCTL_SRAM_BANK7
//!
//! \note \b SYSCTL_SRAM_BANK0 is reserved and always enabled.
//!
//! \return None.
//
//*****************************************************************************
extern void SysCtl_enableSRAMBank(uint_fast8_t sramBank);

//*****************************************************************************
//
//! Disables a set of banks in the SRAM. This can be used to optimize power
//! consumption when every SRAM bank isn't needed. It is important to note
//! that when a  higher bank is disabled, all of the SRAM banks above that bank
//! are also disabled. For example, if the user disables SYSCTL_SRAM_BANK5,
//! the banks SYSCTL_SRAM_BANK6 through SYSCTL_SRAM_BANK7 will be disabled.
//!
//! \param sramBank The SRAM bank tier to disable.
//!        Must be only one of the following values:
//!                 - \b SYSCTL_SRAM_BANK1,
//!                 - \b SYSCTL_SRAM_BANK2,
//!                 - \b SYSCTL_SRAM_BANK3,
//!                 - \b SYSCTL_SRAM_BANK4,
//!                 - \b SYSCTL_SRAM_BANK5,
//!                 - \b SYSCTL_SRAM_BANK6,
//!                 - \b SYSCTL_SRAM_BANK7
//!
//! \note \b SYSCTL_SRAM_BANK0 is reserved and always enabled.
//!
//! \return None.
//
//*****************************************************************************
extern void SysCtl_disableSRAMBank(uint_fast8_t sramBank);

//*****************************************************************************
//
//! Enables retention of the specified SRAM bank register when the device goes
//! into LPM3 mode. When the system is placed in LPM3 mode, the SRAM
//! banks specified with this function will be placed into retention mode. By
//! default, retention of every SRAM bank except SYSCTL_SRAM_BANK0 (reserved) is
//! disabled. Retention of individual banks can be set without the restrictions
//! of the enable/disable functions.
//!
//! \param sramBank The SRAM banks to enable retention
//!        Can be a bitwise OR of the following values:
//!                 - \b SYSCTL_SRAM_BANK1,
//!                 - \b SYSCTL_SRAM_BANK2,
//!                 - \b SYSCTL_SRAM_BANK3,
//!                 - \b SYSCTL_SRAM_BANK4,
//!                 - \b SYSCTL_SRAM_BANK5,
//!                 - \b SYSCTL_SRAM_BANK6,
//!                 - \b SYSCTL_SRAM_BANK7
//! \note  \b SYSCTL_SRAM_BANK0 is reserved and retention is always enabled.
//!
//!
//! \return None.
//
//*****************************************************************************
extern void SysCtl_enableSRAMBankRetention(uint_fast8_t sramBank);

//*****************************************************************************
//
//! Disables retention of the specified SRAM bank register when the device goes
//! into LPM3 mode. When the system is placed in LPM3 mode, the SRAM
//! banks specified with this function will not be placed into retention mode.
//! By default, retention of every SRAM bank except SYSCTL_SRAM_BANK0 (reserved)
//! is disabled. Retention of individual banks can be set without the
//! restrictions of the enable/disable SRAM bank functions.
//!
//! \param sramBank The SRAM banks to disable retention
//!        Can be a bitwise OR of the following values:
//!                 - \b SYSCTL_SRAM_BANK1,
//!                 - \b SYSCTL_SRAM_BANK2,
//!                 - \b SYSCTL_SRAM_BANK3,
//!                 - \b SYSCTL_SRAM_BANK4,
//!                 - \b SYSCTL_SRAM_BANK5,
//!                 - \b SYSCTL_SRAM_BANK6,
//!                 - \b SYSCTL_SRAM_BANK7
//! \note  \b SYSCTL_SRAM_BANK0 is reserved and retention is always enabled.
//!
//! \return None.
//
//
//*****************************************************************************
extern void SysCtl_disableSRAMBankRetention(uint_fast8_t sramBank);

//*****************************************************************************
//
//! Makes it so that the provided peripherals will either halt execution after
//! a CPU HALT. Parameters in this function can be combined to account for
//! multiple peripherals. By default, all peripherals keep running after a
//! CPU HALT.
//!
//! \param devices The peripherals to continue running after a CPU HALT
//!         This can be a bitwise OR of the following values:
//!                 - \b SYSCTL_PERIPH_DMA,
//!                 - \b SYSCTL_PERIPH_WDT,
//!                 - \b SYSCTL_PERIPH_ADC,
//!                 - \b SYSCTL_PERIPH_EUSCIB3,
//!                 - \b SYSCTL_PERIPH_EUSCIB2,
//!                 - \b SYSCTL_PERIPH_EUSCIB1
//!                 - \b SYSCTL_PERIPH_EUSCIB0,
//!                 - \b SYSCTL_PERIPH_EUSCIA3,
//!                 - \b SYSCTL_PERIPH_EUSCIA2
//!                 - \b SYSCTL_PERIPH_EUSCIA1,
//!                 - \b SYSCTL_PERIPH_EUSCIA0,
//!                 - \b SYSCTL_PERIPH_TIMER32_0_MODULE,
//!                 - \b SYSCTL_PERIPH_TIMER16_3,
//!                 - \b SYSCTL_PERIPH_TIMER16_2,
//!                 - \b SYSCTL_PERIPH_TIMER16_1,
//!                 - \b SYSCTL_PERIPH_TIMER16_0
//!
//! \return None.
//
//
//*****************************************************************************
extern void SysCtl_enablePeripheralAtCPUHalt(uint_fast16_t devices);

//*****************************************************************************
//
//! Makes it so that the provided peripherals will either halt execution after
//! a CPU HALT. Parameters in this function can be combined to account for
//! multiple peripherals. By default, all peripherals keep running after a
//! CPU HALT.
//!
//! \param devices The peripherals to disable after a CPU HALT
//!
//! The \e devices parameter can be a bitwise OR of the following values:
//!         This can be a bitwise OR of the following values:
//!                 - \b SYSCTL_PERIPH_DMA,
//!                 - \b SYSCTL_PERIPH_WDT,
//!                 - \b SYSCTL_PERIPH_ADC,
//!                 - \b SYSCTL_PERIPH_EUSCIB3,
//!                 - \b SYSCTL_PERIPH_EUSCIB2,
//!                 - \b SYSCTL_PERIPH_EUSCIB1
//!                 - \b SYSCTL_PERIPH_EUSCIB0,
//!                 - \b SYSCTL_PERIPH_EUSCIA3,
//!                 - \b SYSCTL_PERIPH_EUSCIA2
//!                 - \b SYSCTL_PERIPH_EUSCIA1,
//!                 - \b SYSCTL_PERIPH_EUSCIA0,
//!                 - \b SYSCTL_PERIPH_TIMER32_0_MODULE,
//!                 - \b SYSCTL_PERIPH_TIMER16_3,
//!                 - \b SYSCTL_PERIPH_TIMER16_2,
//!                 - \b SYSCTL_PERIPH_TIMER16_1,
//!                 - \b SYSCTL_PERIPH_TIMER16_0
//!
//! \return None.
//
//
//*****************************************************************************
extern void SysCtl_disablePeripheralAtCPUHalt(uint_fast16_t devices);

//*****************************************************************************
//
//! Sets the type of RESET that happens when a watchdog timeout occurs.
//!
//! \param resetType The type of reset to set
//!
//! The \e resetType parameter must be only one of the following values:
//!         - \b SYSCTL_HARD_RESET,
//!         - \b SYSCTL_SOFT_RESET
//!
//! \return None.
//
//
//*****************************************************************************
extern void SysCtl_setWDTTimeoutResetType(uint_fast8_t resetType);

//*****************************************************************************
//
//! Sets the type of RESET that happens when a watchdog password violation
//! occurs.
//!
//! \param resetType The type of reset to set
//!
//! The \e resetType parameter must be only one of the following values:
//!         - \b SYSCTL_HARD_RESET,
//!         - \b SYSCTL_SOFT_RESET
//!
//! \return None.
//
//
//*****************************************************************************
extern void SysCtl_setWDTPasswordViolationResetType(uint_fast8_t resetType);

//*****************************************************************************
//
//! Disables NMIs for the provided modules. When disabled, a NMI flag will not
//! occur when a fault condition comes from the corresponding modules.
//!
//! \param flags The NMI sources to disable
//! Can be a bitwise OR of the following parameters:
//!         - \b SYSCTL_NMIPIN_SRC,
//!         - \b SYSCTL_PCM_SRC,
//!         - \b SYSCTL_PSS_SRC,
//!         - \b SYSCTL_CS_SRC
//!
//
//*****************************************************************************
extern void SysCtl_disableNMISource(uint_fast8_t flags);

//*****************************************************************************
//
//! Enables NMIs for the provided modules. When enabled, a NMI flag will
//! occur when a fault condition comes from the corresponding modules.
//!
//! \param flags The NMI sources to enable
//! Can be a bitwise OR of the following parameters:
//!         - \b SYSCTL_NMIPIN_SRC,
//!         - \b SYSCTL_PCM_SRC,
//!         - \b SYSCTL_PSS_SRC,
//!         - \b SYSCTL_CS_SRC
//!
//
//*****************************************************************************
extern void SysCtl_enableNMISource(uint_fast8_t flags);

//*****************************************************************************
//
//! Returns the current sources of NMIs that are enabled
//!
//! \return Bitwise OR of NMI flags that are enabled
//
//*****************************************************************************
extern uint_fast8_t SysCtl_getNMISourceStatus(void);

//*****************************************************************************
//
//! Enables glitch suppression on the reset pin of the device. Refer to the
//! device data sheet for specific information about glitch suppression
//!
//! \return None.
//
//
//*****************************************************************************
extern void SysCtl_enableGlitchFilter(void);

//*****************************************************************************
//
//! Disables glitch suppression on the reset pin of the device. Refer to the
//! device data sheet for specific information about glitch suppression
//!
//! \return None.
//
//
//*****************************************************************************
extern void SysCtl_disableGlitchFilter(void);

//*****************************************************************************
//
//! Retrieves the calibration constant of the temperature sensor to be used
//! in temperature calculation.
//!
//! \param refVoltage Reference voltage being used.
//!
//! The \e refVoltage parameter must be only one of the following values:
//!         - \b SYSCTL_1_2V_REF
//!         - \b SYSCTL_1_45V_REF
//!         - \b SYSCTL_2_5V_REF
//!
//! \param temperature is the calibration temperature that the user wants to be
//!     returned.
//!
//! The \e temperature parameter must be only one of the following values:
//!         - \b SYSCTL_30_DEGREES_C
//!         - \b SYSCTL_85_DEGREES_C
//!
//! \return None.
//
//
//*****************************************************************************
extern uint_fast16_t SysCtl_getTempCalibrationConstant(uint32_t refVoltage,
        uint32_t temperature);

//*****************************************************************************
//
// Mark the end of the C bindings section for C++ compilers.
//
//*****************************************************************************
#ifdef __cplusplus
}
#endif

//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************

#endif /* __MCU_HAS_SYSCTL__ */

#endif // __SYSCTL_H__

sysinit.c

/****************************************************/
//MSP432P401R
//时钟配置
//Bilibili：m-RNA
//E-mail:[email protected]
//创建日期:2021/8/11
/****************************************************/

#include "sysinit.h"

//High:48MHz  Low:32768Hz
//MCLK=48MHz  SMCLK=48MHz
void SysInit(void)
{
    WDTCTL = WDTPW | WDTHOLD; // 停用看门狗

    /* 第一步需要配置我们的时钟引脚，这里的高速时钟使用的是外部晶振*/
    //低速时钟初始化比较慢
    MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_PJ, GPIO_PIN3 | GPIO_PIN2, GPIO_PRIMARY_MODULE_FUNCTION); //High
    MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_PJ, GPIO_PIN0 | GPIO_PIN1, GPIO_PRIMARY_MODULE_FUNCTION); //Low
    CS_setExternalClockSourceFrequency(32768, 48000000);

    /* Starting HFXT in non-bypass mode without a timeout. Before we start
     * we have to change VCORE to 1 to support the 48MHz frequency */
    MAP_PCM_setCoreVoltageLevel(PCM_VCORE1);

    /* 更改闪存控制器使用的等待状态数用于读取操作。
    当改变时钟的频率范围时，必须使用此函数以允许可读闪存
    通俗来讲就是CPU跑太快了，Flash跟不上，让CPU等等它 */
    MAP_FlashCtl_setWaitState(FLASH_BANK0, 1);
    MAP_FlashCtl_setWaitState(FLASH_BANK1, 1);

    CS_startHFXT(false);          //这是晶体 需要驱动
    CS_startLFXT(CS_LFXT_DRIVE3); //驱动等级3

    MAP_CS_initClockSignal(CS_MCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);  //48MHz   16分频时，滴答延时可达到最长
    MAP_CS_initClockSignal(CS_SMCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1); //48MHz
}

baudrate_calculate.h

/****************************************************/
// MSP432P401R
// 串口波特率计算
// Bilibili：m-RNA
// E-mail:[email protected]
/****************************************************/

/******************************    说明    ******************************
 *
 * 源码为TI官方编写,本人只是将JS程序移植到了C语言平台,仅作为学习使用。源码出处为：
 * http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSP430BaudRateConverter/index.html
 * 
 * ? 已知问题：
 * 调试时发现某些情况下，C语言的小数的大小与JS的相差较大，
 * 导致了算出的UCSx(即secondModReg)不一样，
 * 这时如果出现不能准确传输时，请换一个波特率。
 *
 * ? 需要注意：
 * 波特率不能大于时钟频率，否则会退出函数
 * 
 * *****************************   版本说明   ******************************
 * 
 * ? v1.2 2021/8/29
 * 注释掉了闪烁灯的代码
 * 
 * ? v1.1  2021/8/27
 * 添加支持固件库v3_21_00_05 
 * 
 * ? v1.0  2021/8/25
 * 仅支持固件库v3_40_01_02
 * 
 * *******************************   结束    *******************************/
 
 #ifndef __RNA_BAUDRATE_CALCULATE_H
#define __RNA_BAUDRATE_CALCULATE_H
#include "driverlib.h"

//错误指示灯宏定义 方便移植使用
//MSP432P401R 有两个红灯P1.0 P2.0
//#define WARN_LED_1_PORT GPIO_PORT_P1
//#define WARN_LED_2_PORT GPIO_PORT_P2
//#define WARN_LED_1_PIN GPIO_PIN0
//#define WARN_LED_2_PIN GPIO_PIN0
//#define WARN_LED_INIT MAP_GPIO_setAsOutputPin
//#define WARN_LED_ON MAP_GPIO_setOutputHighOnPin
//#define WARN_LED_OFF MAP_GPIO_setOutputLowOnPin

#ifdef EUSCI_A_UART_7_BIT_LEN
void eusci_calcBaudDividers(eUSCI_UART_ConfigV1 *uart_config, uint32_t baudRate); //固件库v3_40_01_02
#else
void eusci_calcBaudDividers(eUSCI_UART_Config *uart_config, uint32_t baudRate); //固件库v3_21_00_05
#endif

#endif

baudrate_calculate.c

/****************************************************/
// MSP432P401R
// 串口波特率计算
// Bilibili：m-RNA
// E-mail:[email protected]
/****************************************************/

/******************************    说明    ******************************
 *
 * 源码为TI官方编写,本人只是将JS程序移植到了C语言平台,仅作为学习使用。源码出处为：
 * http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSP430BaudRateConverter/index.html
 *
 * ? 已知问题：
 * 调试时发现某些情况下，C语言的小数的大小与JS的相差较大，
 * 导致了算出的UCSx(即secondModReg)不一样，
 * 这时如果出现不能准确传输时，请换一个波特率。
 *
 * ? 需要注意：
 * 波特率不能大于时钟频率，否则会退出函数
 *
 * *****************************   版本说明   ******************************
 *
 * ? v1.2 2021/8/29
 * 注释掉了闪烁灯的代码
 * 
 * ? v1.1  2021/8/27
 * 添加支持固件库v3_21_00_05
 *
 * ? v1.0  2021/8/25
 * 仅支持固件库v3_40_01_02
 *
 * *******************************   结束    *******************************/

#include "baudrate_calculate.h"

//void uart_warning_led(void);

/*
 *  ======== bitPosition ========
 *  return 1(0) if the specified bit position in value is set(clear)
 */
bool bitPosition(uint16_t value, uint16_t position)
{
    if ((value & (1 << position)))
        return 1;
    return 0;
}

/*
 *  ======== eusci_calcBaudDividers ========
 *  computes the eUSCI_UART register settings for a given clock and baud rate
 *
 *      UCOS16:      the oversampling bit (0 or 1)
 *      UCBRx:       the Baud Rate Control Word
 *      UCFx:        the First modulation stage select (UCBRFx)
 *      UCSx:        the Second modulation stage select (UCBRSx)
 *      maxAbsError: the maximum TX error for the register setting above
 *
 *  The first four field names match the names used in Table 18-5,
 *  "Recommended Settings for Typical Crystals and Baudrates", of the
 *  MSP430FR57xx Family User's Guide (SLAU272A).
 */
#ifdef EUSCI_A_UART_7_BIT_LEN
void eusci_calcBaudDividers(eUSCI_UART_ConfigV1 *uart_config, uint32_t baudRate) //固件库v3_40_01_02
#else
void eusci_calcBaudDividers(eUSCI_UART_Config *uart_config, uint32_t baudRate) //固件库v3_21_00_05
#endif
{
    float maxAbsErrorInByte;
    float minAbsError;
    float error;
    uint8_t ii;
    uint16_t jj;
    uint16_t NN;
    uint32_t count;
    uint32_t clockRate;

    if (!uart_config || !baudRate) //传参错误 退出函数
    {
        //uart_warning_led(); //闪烁错误指示灯10次
        return;
    }

    if (uart_config->selectClockSource == EUSCI_A_UART_CLOCKSOURCE_SMCLK)
        clockRate = MAP_CS_getSMCLK();
    else if (uart_config->selectClockSource == EUSCI_A_UART_CLOCKSOURCE_ACLK)
        clockRate = MAP_CS_getACLK();
    else
    {
        uart_config->selectClockSource = EUSCI_A_UART_CLOCKSOURCE_SMCLK;
        clockRate = MAP_CS_getSMCLK();
    }
    if (baudRate > clockRate) //判断波特率是否大于时钟频率 是则退出函数
    {
        //uart_warning_led(); //闪烁错误指示灯10次
        return;
    }
    //var result = {UCOS16 : 0, UCBRx : 0, UCFx : 0, UCSx : 0, maxAbsError : 0};

    NN = (uint16_t)((float)clockRate / (float)baudRate); //应该是不需要floor

    minAbsError = 100000;
    for (jj = 0; jj <= 255; jj++)
    {

        maxAbsErrorInByte = 0;
        count = 0;
        for (ii = 0; ii <= 10; ii++)
        {
            count += NN + bitPosition(jj, 7 - (ii % 8));

            //error = (ii + 1) * baudPeriod - count * clockPeriod;
            error = (ii + 1) / (float)baudRate - count / (float)clockRate; //为了减少变量，改为此代码

            if (error < 0)
                error = -error;

            if (error > maxAbsErrorInByte)
                maxAbsErrorInByte = error;
        }
        if (maxAbsErrorInByte - minAbsError < -7.3e-12f) //这里就是“已知问题”
        {
            minAbsError = maxAbsErrorInByte;
            uart_config->secondModReg = jj;
        }
    }

    if (NN < 20)
    {
        uart_config->overSampling = 0;
        uart_config->clockPrescalar = NN;
        uart_config->firstModReg = 0;
    }
    else
    {
        uart_config->overSampling = 1;
        uart_config->clockPrescalar = (uint16_t)((float)NN / 16.0f); //应该是不需要floor
        uart_config->firstModReg = NN - (uart_config->clockPrescalar * 16);
    }
    //return minAbsError * baudRate * 100;
}

闪烁错误指示灯10次
//void uart_warning_led(void)
//{
//    uint8_t ii;
//    uint32_t jj;
//    WARN_LED_INIT(WARN_LED_1_PORT, WARN_LED_1_PIN);
//    WARN_LED_INIT(WARN_LED_2_PORT, WARN_LED_2_PIN);
//    for (ii = 0; ii < 10; ii++)
//    {
//        WARN_LED_ON(WARN_LED_1_PORT, WARN_LED_1_PIN);
//        WARN_LED_OFF(WARN_LED_2_PORT, WARN_LED_2_PIN);
//        for (jj = 0; jj < 100000; jj++)
//            ;
//        WARN_LED_OFF(WARN_LED_1_PORT, WARN_LED_1_PIN);
//        WARN_LED_ON(WARN_LED_2_PORT, WARN_LED_2_PIN);
//        for (jj = 0; jj < 100000; jj++)
//            ;
//    }
//}

main.c

#include "driverlib.h"

/* Standard Includes */
#include 
#include 

#include "sysinit.h"
#include "usart.h"
#include "baudrate_calculate.h"

int main(void)
{
	SysInit();		 //1.配置时钟
	uart_init(115200); //包含了2.配置GPIO复用   3.初始化串口   4.开启串口模块
	
	printf("MSP432\r\n");
	printf("2021/8/24\r\n\r\n");

	char c = '!';
	char *s = "printf test";
	int i = -12345;
	unsigned u = 4321;
	long int l = -123456780;
	unsigned long n = 1098765432;
	unsigned x = 0x89AB;

	printf("Char           %c\r\n", c);
	printf("String         %s\r\n", s);
	printf("Integer        %d\r\n", i);
	printf("Unsigned       %u\r\n", u);
	printf("Long           %d\r\n", l);
	printf("Unsigned long  %u\r\n", n);
	printf("HEX            %X\r\n", x);

	while (1)
	{
//		 使用微库则可支持 scanf
//		 char a[100];
//		 scanf("%s", a);
//		 printf("%s\r\n", a);
	}
}

注意：未知原因scanf用不了，勾选了微库也无法解决