1、功能说明
    Cordic在中断模式下计算sin函数的示例。
    本示例中输入数据为从-1到1区间的浮点随机数，由rand（）函数生成，存储于类型为float的数组aInData[]中，长度64*4字节；Cordic计算结果存储于类型为float的数组aCalResult[]中。软件（调用sinf（）函数）计算的结果存储于类型为float的数组aRefResult[]。Cordic计算结果与aRefResult[]的值进行比较，若低于最大误差值，则计算结果符合预期。最大误差值与配置的Precision有关。


2、使用环境

    软件开发环境：
        KEIL MDK-ARM V5.34
        IAR EWARM 8.50.1

    硬件开发环境：
        基于全功能板N32H497ZGL7_EVB V1.0开发


3、使用说明
    
    系统配置：
        1、时钟源：HSI+PLL
        2、时钟频率：240MHz
        3、打印：PA9 - baud rate 115200

    Cordic配置：
        1、Function：sin
        2、Precision：6CYCLES（建议最大配置为6cycles）
        3、Scale：0
        4、NbWrite：1
        5、NbRead：1
        6、InSize：32-bits
        7、OutSize：32-bits
        8、InSelect：浮点
        9、OutSelect： 浮点
        10、CodinLimit：禁用
        11、PhaseLimit：禁用

    使用方法：
        在KEIL下编译后烧录到评估板。
        开启打印输出，可以看到串口输出“CORDIC_Float_Sin_IT demo go...”；若计算结果与参考值的差大于最大误差值，则串口输出“Error”；若计算结果与参考值的差小于等于最大误差值，则串口输出“CORDIC demo success!!!”，指示计算结果符合预期。


4、注意事项
    对于N32H49x系列，使用CORDIC模块时，必须配置HCLK预分频器的分频系数为DIV2（即：RCC_ConfigPeriphClk(RCC_PERIPH_HCLK_DIV2)）。


1. Function description
    Example of the Cordic compute sin function in interrupt mode.
    The input data in this example is a floating-point random number in the interval from -1 to 1, generated by the rand () function and stored in the array aInData[] of type float, length 64*4 bytes; the result of Cordic calculation is stored in the array aCalResult[] of type float. The result of software (call sinf() function) calculation is stored in array aRefResult[] of type float. The result of the Cordic calculation is compared with the value of aRefResult[], if it is lower than the maximum error value, the calculation is as expected. The maximum error value is related to the configured Precision.

2. Use environment

    Software development environment: 
        KEIL MDK-ARM V5.34
        IAR EWARM 8.50.1

    Hardware development environment:
        Developed based on the full-function board N32H497ZGL7_EVB V1.0

3. Instructions for use
    
     System Configuration:
        1. Clock source: HSI+PLL
        2. Clock frequency: 240MHz
        3. printf: PA9 - baud rate 115200

    Cordic configuration:
        1、Function：sin
        2、Precision：6CYCLES（Maximum recommended configuration is 6cycles）.
        3、Scale：0
        4、NbWrite：1
        5、NbRead：1
        6、InSize：32-bits
        7、OutSize：32-bits
        8、InSelect：Floating Point
        9、OutSelect： Floating point
        10、CodinLimit：Disabled
        11、PhaseLimit：Disabled

     Instructions:
        Compile it under KEIL and burn it to the evaluation board.
        Turn on the printout, you can see the serial output "CORDIC_Float_Sin_IT demo go..."; If the difference between the calculated result and the reference value is greater than the maximum error value, the serial port outputs "Error"; if the difference between the calculated result and the reference value is less than or equal to the maximum error value, the serial port outputs "CORDIC demo success!!!", indicating that the calculated result meets the expectation.

4. Attention
    For the N32H49x series, when using the CORDIC module, the HCLK prescaler must be configured with a division factor of DIV2 (i.e., RCC_ConfigPeriphClk(RCC_PERIPH_HCLK_DIV2)).

