Nations.N32A455_Library.1.5.0版本：
1. FLASH驱动中编写FLASH和选项字节相关函数中，调用FLASH_WaitForLastOpt改为传入局部变量
2. system.c文件中FLASH latency注释改为与sysclk相关
3. 优化I2C例程中i2c_master_recv函数2字节处理流程
4. OPA模块新增OpaTrim的例程

Nations.N32A455_Library.1.4.0版本：
1.更新FLASH驱动，添加页擦的地址判断
2.更新USART demo，更改IO配置和添加OREF处理
3.STOP2例程增加STOP2模式下只有R-SRAM可以保持的注意事项描述
4.RTC中读取TSH寄存器、SUBS寄存器后再读取一次DATE寄存器触发同步
5.SPI_Flash Demo中sFLASH_SendByte()函数和sFLASH_SendHalfWord()函数中发送完数据后先获取TE和BUSY标志，之后才获取RNE标志
6.RTC中AutoWakeup中断改成获取EXTI标志
7.优化DMA模块驱动DMA_DeInit函数
8.STOP2例程添加注释
9.优化SystemInit函数
10.优化I2C EEPROM例程，防止低主频下数据出错
11.添加I2C双地址例程
12.新增GCC应用示例
13.所有RTC的Demo闹钟设置DateWeekValue从0x31改成31
14.优化RCC驱动RCC_ConfigRtcClk()函数
15.修正ADC_GetFlagStatusNew函数中的断言
16.优化ADC温度传感器的demo
17.优化ADC_StartCalibration与ADC_GetCalibrationStatus函数
18.修正TIM复用的宏定义GPIO_PART2_RMP_TIM3
19.添加RCC_ConfigLSETrim函数，LSE使能时默认配置为0x145

Nations.N32A455_Library.1.3.0版本：
1. 修改system_n32g45x.c中的SystemInit函数
2. EXTI中断服务函数中获取标志位修改为EXTI_GetStatusFlag函数
3. 进入STOP2或STANDBY模式前添加时钟配置流程
4. 优化RTC_CLKSourceConfig函数
5. 优化RTC驱动函数RTC_GetTime

Nationstech.N32A455_Library.1.2.0版本：
1.增加函数TIM_ConfigUpdateEvt。
2.修改ADC驱动n32a455_adc.c与.h文件，拓展ADC_GetIntStatus()，ADC_ConfigInt()函数的传参；
3.修改ADC demo中ADC DMA使能的位置以及关于ENDC/JENDC使用；
4.删除DEMO中DBG配置和描述
5.修改RTC_EnterInitMode函数
6. 删除ICache的coremark demo
7. CAN模块CAN_Tx_Rx/Dual_CAN1_2/LoopBack_CAN1三个demo，Systick_MS_Config函数去掉封装，改为直接调用的形式
8. USART模块在DMA_Interrupt/Interrupt/LIN_slave DEMO中，中断函数中添加对ORERR/PEF/NEF/FEF标志的判断和清除操作。
9.优化PWR模块AlarmWakeUp DEMO和STOP DEMO
10.修改RCC、I2C例程报错处理方式
11.修改system_n32a455.c：初始化开icache，关预取
12.驱动n32a455_adc.c中，ADC_GetIntStatus()与ADC_GetFlagStatus()增加延时处理
13.修改中文字符
14.优化TIM模块ComplementarySignals DEMO
15.优化TIM_InitBkdtStruct结构体
16.修改宏定义GPIO_RMP2_SPI2为GPIO_RMP3_SPI2
17.优化PWR模块的PWR_AlarmWakeUp、STOP0和STOP2例程：进STOP模式前将系统时钟源配置为HSI。

Nationstech.N32A455_Library.1.0.0版本：
1.V1.0.0初始版本

Nationstech.N32A455_Library.1.1.0版本：
1.USART:
	新增SmartCard 例程
2.QSPI:
	优化QSPI GPIO配置
3.system_n32a455.c新增VDDDBK trim调节函数
4.修改ADC校准和ADC使能后延时8us
5.RCC新增HSI修正接口
6.修改system_n32a455.c文件，限定选择PLL为时钟源时，系统时钟最小为32MHz
7.修改SPI DMA读写Flash在某些SPI分频下失败的问题
8.修改 LoopBack_CAN1  readme.txt CAN_TX/RX引脚标注
9.在OpaAdByTim Demo中，将TIM死区时间插入配置中自动输出项修改成失能
10.TIM的demo中增加结构体初始化
11.修改Dual_CAN1_2例程Readme CAN_TX/RX引脚注释
12.修改IWDG_Reset例程延时时间
13.修改WWDG_Reset例程Readme注释超时复位时间
14.RtcAutoWakeUp 例程进入唤醒中断后先清EXTI_LINE20标志
15.修改DMA的demo中注释错误和readme错误的地方
16.RTC例程增加避免重复预分频机制
17.I2C_10bit demo的readme中添加需要上拉电阻的描述
18.QSPI_QUAD demo中未使用DMA，删除相关描述
19.RTC唤醒例程中，中断函数内判断唤醒标志位后再删除标志位修改为直接清除标志位
20.qspi.c文件中PA7初始化代码错误，修正
21.配置latency由直接操作寄存器修改为调用库函数

/*===================================================================================================================*/
Nations.N32A455_Library.1.4.0 version:
1. Update FLASH driver and add address determination for page erase
2. Update the USART demo, change IO configuration, and add OREF processing
3. Added a note to the STOP2 example describing that only R-SRAM can be retained in STOP2 mode.
4. After reading the TSH register and SUBS register in the RTC, read the DATE register once more to trigger synchronization.
5. In the SPI_Flash Demo, the sFLASH_SendByte() and sFLASH_SendHalfWord() functions first acquire the TE and BUSY flags after sending data, and only then acquire the RNE flag.
6. In the AutoWakeup demo , interrupt has been changed to acquiring the EXTI flag.
7. Optimized DMA Module Driver DMA_DeInit Function.
8. STOP2 demo add note.
9. Optimize the SystemInit function.
10. Optimize the I2C EEPROM demo to prevent data errors at low clock frequencies.
11. Add I2C Dual Address demo.
12. Added GCC Application Examples.
13. For all RTC demo alarm settings, change the DateWeekValue from 0x31 to 31.
14. Optimize the RCC driver function RCC_ConfigRtcClk().
15. Modify assertions in the ADC_GetFlagStatusNew function
16. Optimize the ADC temperature sensor demo
17. Optimize the ADC_StartCalibration and ADC_GetCalibrationStatus functions
18. Modified macro definition for TIM remap: GPIO_PART2_RMP_TIM3
19. Added RCC_ConfigLSETrim function, When LSE is enabled, the default configuration is 0x145.

Nations.N32A455_Library.1.3.0 version:
1.Modify SystemInit function in system_n32g45x.c
2.EXTI interrupt handle function,get flag with EXTI_GetStatusFlag function
3.Add clock config before enter STOP2/STANDBY mode
4.Modify RTC_CLKSourceConfig function
5.Modify RTC_GetTime function in rtc.c

Nationstech.N32A455_Library.1.2.0 version:
1.Added TIM_ConfigUpdateEvt.
2.Modify the driver file n32a455_adc.c/.h for ADC , and expand the parameters of "ADC_GetIntStatus()，ADC_ConfigInt()" function;
3.Modify the code position of the ADC DMA enabling  in ADC demo ,and modify the usage of ENDC/JENDC flag.
4.Delect DBG configuration and discription in DEMO
5.Modify RTC_EnterInitMode function.
6. Delete the coremark demo of ICache.
7. CAN module CAN_Tx_Rx/Dual_CAN1_2/LoopBack_CAN1 demos, remove the wrapping of Systick_MS_Config function and replace it with a direct call.
8. USART module in the DMA_Interrupt/Interrupt/LP_Transmit_Receive/Transmit_Receive/LIN_slave DEMO, interrupt function to add the ORERR/PEF/NEF/FEF flag judgment and clear the operation.
9.Optimized PWR module AlarmWakeUp DEM and STOP DEMO.
10.Modify the error handling of RCC and I2C routines.
11.Modify system_n32a455.c：Initialization with icache on, prefetch off
12.ADC_GetIntStatus and ADC_GetFlagStatus functions in n32a455_adc.c file to add delay processing
13.Modify chinese characters
14.Optimized TIM module ComplementarySignals DEMO.
15.Optimized TIM_InitBkdtStruct.
16.Modify macro definition GPIO_RMP2_SPI2 to GPIO_RMP3_SPI2
17.Optimize PWR_AlarmWakeUp, STOP0 and STOP2 demo of PWR module: configure the system clock source to HSI before entering STOP mode


Nationstech.N32A455_Library.1.0.0 version:
1.V1.0.0 initial version

Nationstech.N32A455_Library.1.1.0 version:
1.USART:
	Added SmartCard demo
2.QSPI：
	
	Optimize QSPI GPIO driver configuration
3.Added VDDDBK trim function in the system_n32a455.c.
4.Modify ADC need to delay 8us after ADC Calibration and ADC enable.
5.Added HSI TRIM function in the RCC. 
6.Modify system_n32a455.c.file ,when PLL is selected as system clock source, the minimum system clock is 32MHz
7.Modify the problem that SPI DMA read and write Flash fails under certain SPI frequency division
8.Modify CAN_TX/RX pin lable in readme.txt of LoopBack_CAN1 demo
9.In the OpaAdByTim demo, change the Auto Output item in dead-time configuration to disable.
10.Added structure initializes of tim's demo.
11.Modify CAN_TX/RX pin lable in the Dual_CAN1_2 demo readme file
12.Modify the delay time of IWDG_Reset demo
13.Modify WWDG_Reset demo readme lable timeout reset time
14.RtcAutoWakeUp demo clear EXTI_LINE20 flag first after entering wakeup interrupt
15.Modify comments and readme errors in DMA's demo
16.Adding a machanism to avoid repetitive pre division in RTC demo
17.I2C_10bit demo's readme adds description of pull_up resistor
18.Remove the description of DMA from the QSPI_QUAD's readme
19.Clear the wake up flag directly in the interrupt handler,in the RtcAutoWakeUp demo.
20.PA7 initialization code error in qspi.c, fixed.
21.Configuration latency is modified from direct register manipulation to libraryfunction calls.