stm32利用正弦表格生成spwm

生成SPWM（正弦波脉宽调制）信号的一种方法是使用正弦表格。正弦表格是一个包含完整正弦波一个周期中所有采样点的数组。使用正弦表格，可以在实时系统中快速计算SPWM信号。

以下是在STM32上使用正弦表格生成SPWM信号的步骤：

1. 创建一个包含完整正弦波一个周期中所有采样点的数组。

    #define TABLE_SIZE 256
    uint16_t sine_table[TABLE_SIZE] = {0, 402, 804, 1206, 1608, 2010, 2411, 2811, 3211, 3611, 4010, 4408, 4805, 5201, 5596, 5990, 6382, 6772, 7161, 7548, 7933, 8316, 8697, 9076, 9452, 9826, 10197, 10565, 10931, 11294, 11654, 12011, 12365, 12716, 13064, 13408, 13749, 14087, 14421, 14752, 15079, 15402, 15721, 16037, 16349, 16657, 16960, 17260, 17555, 17846, 18132, 18414, 18691, 18964, 19232, 19495, 19754, 20007, 20256, 20500, 20739, 20973, 21201, 21424, 21641, 21853, 22059, 22260, 22455, 22644, 22828, 23005, 23177, 23343, 23503, 23657, 23805, 23947, 24082, 24212, 24335, 24452, 24563, 24667, 24766, 24858, 24944, 25023, 25096, 25162, 25222, 25275, 25322, 25362, 25395, 25422, 25442, 25455, 25462, 25462, 25455, 25442, 25422, 25395, 25362, 25322, 25275, 25222, 25162, 25096, 25023, 24944, 24858, 24766, 24667, 24563, 24452, 24335, 24212, 24082, 23947, 23805, 23657, 23503, 23343, 23177, 23005, 22828, 22644, 22455, 22260, 22059, 21853, 21641, 21424, 21201, 20973, 20739, 20500, 20256, 20007, 19754, 19495, 19232, 18964, 18691, 18414, 18132, 17846, 17555, 17260, 16960, 16657, 16349, 16037, 15721, 15402, 15079, 14752, 14421, 14087, 13749, 13408, 13064, 12716, 12365, 12011, 11654, 11294, 10931, 10565, 10197, 9826, 9452, 9076, 8697, 8316, 7933, 7548, 7161, 6772, 6382, 5990, 5596, 5201, 4805, 4408, 4010, 3611, 3211, 2811, 2411, 2010, 1608, 1206, 804, 402, 0, -402, -804, -1206, -1608, -2010, -2411, -2811, -3211, -3611, -4010, -4408, -4805, -5201, -5596, -5990, -6382, -6772, -7161, -7548, -7933, -8316, -8697, -9076, -9452, -9826, -10197, -10565, -10931, -11294, -11654, -12011, -12365, -12716, -13064, -13408, -13749, -14087, -14421, -14752, -15079, -15402, -15721, -16037, -16349, -16657, -16960, -17260, -17555, -17846, -18132, -18414, -18691, -18964, -19232, -19495, -19754, -20007, -20256, -20500, -20739, -20973, -21201, -21424, -21641, -21853, -22059, -22260, -22455, -22644, -22828, -23005, -23177, -23343, -23503, -23657, -23805, -23947, -24082, -24212, -24335, -24452, -24563, -24667, -24766, -24858, -24944, -25023, -25096, -25162, -25222, -25275, -25322, -25362, -25395, -25422, -25442, -25455, -25462, -25462, -25455, -25442, -25422, -25395, -25362, -25322, -25275, -25222, -25162, -25096, -25023, -24944, -24858, -24766, -24667, -24563, -24452, -24335, -24212, -24082, -23947, -23805, -23657, -23503, -23343, -23177, -23005, -22828, -22644, -22455, -22260, -22059, -21853, -21641, -21424, -21201, -20973, -20739, -20500, -20256, -20007, -19754, -19495, -19232, -18964, -18691, -18414, -18132, -17846, -17555, -17260, -16960, -16657, -16349, -16037, -15721, -15402, -15079, -14752, -14421, -14087, -13749, -13408, -13064, -12716, -12365, -12011, -11654, -11294, -10931, -10565, -10197, -9826, -9452, -9076, -8697, -8316, -7933, -7548, -7161, -6772, -6382, -5990, -5596, -5201, -4805, -4408, -4010, -3611, -3211, -2811, -2411, -2010, -1608, -1206, -804, -402};

2. 将定时器配置为PWM模式，并将频率设置为所需的SPWM信号频率。

3. 在定时器中断处理程序中，计算当前正弦表格中的索引，并将其作为占空比写入PWM输出寄存器。

    void TIMx_IRQHandler(void) {
        static uint16_t index = 0;
        TIM_ClearITPendingBit(TIMx, TIM_IT_Update);
        index = (index + 1) % TABLE_SIZE;
        TIM_SetComparex(TIMx, TIM_Channel_x, sine_table[index]);
    }

在这个示例中，TIMx代表使用的定时器，TIM_Channel_x代表使用的PWM通道。在每次定时器中断时，将索引值递增，并将对应的正弦表格值作为占空比写入PWM输出寄存器。最终，输出的PWM信号将是一个与正弦波形相似的SPWM信号。

需要注意的是，使用正弦表格生成SPWM信号的精度取决于正弦表格的采样率和PWM输出频率。在实际应用中，可能需要进行一些调整和优化，以获得最佳的SPWM信号质量。