OM13090_LPC54114简易频谱（附hex文件）

小马哥-1650185 · 发表于 2018-1-11 00:20:07

本帖最后由小马哥-1650185 于 2018-1-11 19:01 编辑

随便瞎玩的。。。

本测试基于官方sdk的 dmic_dam例程，增加了oled驱动，和fft算法。。。。
下来显示个图片玩玩吧

然后进入频谱章节。。。。。。

大概就是这样子喽，声音通过数字麦克采集，54114 开启dma 采集128个点，然后进入fft运算，得到声音信号中的不同频率成分，送oled显示

串口打印信息如下：

QQ截图20180111184421.jpg

其实挺简单的，没什么，就是在调试oeld 驱动时候花了一些时间

oled io配置

typedef struct {
uint8_t port;
uint8_t pin;
uint32_t modefunc;
bool init_state;
} SPI_BB_IO_T;
gpio_pin_config_t oled_config = {
kGPIO_DigitalOutput, 0,
};
static const SPI_BB_IO_T bb_io[] = {
{ 1, 1, (IOCON_FUNC0 | IOCON_MODE_PULLUP | IOCON_DIGITAL_EN), true }, // SPI SSEL
{ 0, 19, (IOCON_FUNC0 | IOCON_MODE_PULLUP | IOCON_DIGITAL_EN), false }, // SPI SCK
{ 0, 20, (IOCON_FUNC0 | IOCON_MODE_PULLUP | IOCON_DIGITAL_EN), false }, // SPI MOSI
{ 1, 15, (IOCON_FUNC0 | IOCON_MODE_PULLUP | IOCON_DIGITAL_EN), true }, // OLED DATA/CMD
{ 1, 14, (IOCON_FUNC0 | IOCON_MODE_PULLUP | IOCON_DIGITAL_EN), true }, // OLED nRESET
{ 1, 12, (IOCON_FUNC0 | IOCON_MODE_PULLUP | IOCON_DIGITAL_EN), false }, // OLED VPP control
};
static const uint32_t bb_io_ct = sizeof(bb_io) / sizeof(SPI_BB_IO_T);
static void init_pinmux(void)
{
uint32_t i;
for (i=0; i<bb_io_ct; i++) {
IOCON_PinMuxSet(IOCON, bb_io[i].port, bb_io[i].pin, bb_io[i].modefunc);
}
}
static void init_gpio(void)
{
uint32_t i;
for (i=0; i<bb_io_ct; i++) {
GPIO_PinInit(GPIO, bb_io[i].port, bb_io[i].pin, &oled_config);
// GPIO->DIR[bb_io[i].port] |= 1UL << bb_io[i].pin;
GPIO_PinWrite(GPIO, bb_io[i].port, bb_io[i].pin, bb_io[i].init_state);
}
}

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oled 相关寄存器

static uint8_t init_seq[] = {
0xae, // Display OFF
0xd5, // Set D-clock
0x50, // 100Hz
0x20, // Set row address
0x81, // Set contrast control
0xc0,
0xa0, // Segment remap
0xa4, // Set Entire Display ON
0xa6, // Normal display
0xad, // Set external VPP
0x80,
0xc0, // Set Common scan direction
0xd9, // Set phase length
0x25,
0xdb, // Set Vcomh voltage
0x28, // 0.687*VPP
// 0xaf // Display ON
};

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自己写的一些方法。。。

void OLED_Draw_Point(int32_t x1,int32_t y1, uint16_t color);
uint16_t OLED_Get_Point_Vaule( int x1, int y1);
void OLED_Clear (uint16_t color);
void OLED_Clear_Fbp( unsigned short color);
void OLED_Draw_Line(int x1,int y1,int x2,int y2, uint16_t color);
void OLED_Draw_Line_1(int x1, int y1, int x2, int y2, uint16_t color);
void OLED_Draw_box(int x1, int y1,int x2,int y2, unsigned short color);
void OLED_Draw_Rectangle(int x1, int y1, int x2, int y2, uint16_t color);
void OLED_Darw_Circle(int xc, int yc,int r, uint16_t color, int fill);
void OLED_Darw_Circle_1( int cx, int cy, int radius, uint16_t color, int fill);
void OLED_fill_Box(int x1,int y1,int x2,int y2, uint16_t color);
void OLED_Darw_BAR(int x0,int y0,int w,float data,int data_max,int h_max, uint16_t color);
void OLED_Move_BAR(int x,int y,int w,int num,int len,float* data,int data_max,int h_max, uint16_t color);
void OLED_Move_BAR_dynamic(int x,int y,int w,int num,int len,float* data,float* data_old,int data_max,int h_max, uint16_t color);
void OLED_Draw_wave(int x,int y,int data_max, short h_max, uint16_t * p, unsigned short color);
void OLED_Show_Char(int x,int y,uint16_t font,uint16_t color,uint16_t backcolor,uint8_t num);
void OLED_Show_String( int x,int y,uint16_t font,uint16_t color,uint16_t backcolor, char *p);
void OLED_Show_HZ_Char(int x,int y,uint16_t font,uint16_t color,uint16_t backcolor,uint16_t num);
void OLED_Show_HZ_String( int x,int y,uint16_t font,uint16_t color,uint16_t backcolor,unsigned char *p);
void OLED_Printf( int x,int y,uint16_t font,uint16_t color,uint16_t backcolor, char *p);
void OLED_Draw_Image(int x, int y, uint16_t color,uint16_t backcolor, const unsigned char* pic_array);

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主循环代码

while (1)
{
if(dmic_hwvad_ok == true)
{
// OLED_Clear(0);
dmic_hwvad_ok= false;
DMIC_TransferReceiveDMA(DMIC0, &g_dmicDmaHandle, &receiveXfer, APP_DMIC_CHANNEL);
if(g_Transfer_Done == true)
{
g_Transfer_Done = false;
PRINTF("Transfer completed\r\n");
PRINTF("----DMIC----From----DMA------To------CPU:\r\n");
for (i = 0; i < BUFFER_LENGTH; i++)
{
PRINTF("%5d , ", g_rxBuffer[i]);
if(((i!=0)&&((i+1)%8 == 0)) ||(i ==BUFFER_LENGTH-1 )) PRINTF("\r\n");
}
PRINTF("\r\n--------------------M.G.F----------------------\r\n");
}
// OLED_Draw_wave(0,63,65536,63,g_rxBuffer_old,BLACK);
// OLED_Draw_wave(0,0,65536,63,g_rxBuffer,WHITE);
// memcpy(g_rxBuffer_old,g_rxBuffer,sizeof(g_rxBuffer));
//把数据送入结构体comp对象的实部,虚部等于零.
for(uint8_t j=0;j<FFT_N;j++)
{
//实部初始化为需要fft变换的数据
DMIC_Buffer[j].real= g_rxBuffer[j]>>4;
//虚部初始化为0
DMIC_Buffer[j].imag= 0;
}
FFT(DMIC_Buffer);//fft变换
fft_result(DMIC_Buffer);//求分次谐波模值存入复数的实部
THD_signle(DMIC_Buffer,DMIC_Voltage);//分次谐波值
PRINTF("----FFT----FFT----FFT------\r\n");
for (i = 0; i < 128; i++)
{
PRINTF("%05d, ", (unsigned int)DMIC_Buffer[i].real);
if(((i!=0)&&((i+1)%8 == 0)) ||(i ==128-1 )) PRINTF("\r\n");
}
PRINTF("----FFT----FFT----FFT------\r\n");
OLED_Move_BAR(2,100,2,62,125,DMIC_Voltage+2,100,80, WHITE);
OLED_Update_Display();
}
}