拆解百元mini示波器：是玩具还是生产力？

#include "lcd.h"#include "stdlib.h"#include "font.h" #include "stdarg.h"
#define  LCD_CMD         ((u32)0x6001FFFF)#define  LCD_DATA        ((u32)0x60020000)

#define LCD_CLEAR_SEND_NUMBER 5760
u16 BACK_COLOR = BLACK, FORE_COLOR = WHITE;
void lcd_write_cmd(const u8 cmd){    *(__IO u8*)LCD_CMD=cmd;}
void lcd_write_data(const u8 data){    *(__IO u8*)LCD_DATA=data;}
void lcd_write_half_word(const u16 da){    *(__IO u8*)LCD_DATA=(u8)(da>>8);    *(__IO u8*)LCD_DATA=(u8)da;}
u8 lcd_read_data(void){    vu8 ram;    ram = *(__IO u8*)LCD_DATA;    return ram;}
u8 lcd_read_reg(const u8 reg){    lcd_write_cmd(reg);    delay_us(5);    return lcd_read_data();
}
void lcd_fsmc_init(void){    GPIO_InitTypeDef GPIO_InitStructure={0};    FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure={0};    FSMC_NORSRAMTimingInitTypeDef  readWriteTiming={0};    FSMC_NORSRAMTimingInitTypeDef  writeTiming={0};
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE);    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE|RCC_APB2Periph_GPIOG,ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_14|GPIO_Pin_15;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init(GPIOE, &GPIO_InitStructure);
    /*   RS--D12  */    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init(GPIOD, &GPIO_InitStructure);
    /* CS: PD11*/    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init(GPIOD, &GPIO_InitStructure);    GPIO_ResetBits(GPIOD,GPIO_Pin_11);
    readWriteTiming.FSMC_AddressSetupTime = 0x01;    readWriteTiming.FSMC_AddressHoldTime = 0x00;    readWriteTiming.FSMC_DataSetupTime = 0x0f;    readWriteTiming.FSMC_BusTurnAroundDuration = 0x00;    readWriteTiming.FSMC_CLKDivision = 0x00;    readWriteTiming.FSMC_DataLatency = 0x00;    readWriteTiming.FSMC_AccessMode = FSMC_AccessMode_A;
    writeTiming.FSMC_AddressSetupTime = 0x00;    writeTiming.FSMC_AddressHoldTime = 0x00;    writeTiming.FSMC_DataSetupTime = 0x03;    writeTiming.FSMC_BusTurnAroundDuration = 0x00;    writeTiming.FSMC_CLKDivision = 0x00;    writeTiming.FSMC_DataLatency = 0x00;    writeTiming.FSMC_AccessMode = FSMC_AccessMode_A;
    FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1;
    FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;    FSMC_NORSRAMInitStructure.FSMC_MemoryType =FSMC_MemoryType_SRAM;    FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_8b;    FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode =FSMC_BurstAccessMode_Disable;    FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;    FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable;    FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;    FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;    FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;    FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;    FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Enable;    FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;    FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &readWriteTiming;    FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &writeTiming;    FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);    FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE);
}
/******************************************************************************** Function Name  : TIM1_PWMOut_Init* Description    : Initializes TIM1 PWM output.* Input          : arr: the period value.*                  psc: the prescaler value.*                                    ccp: the pulse value.* Return         : None*******************************************************************************/void TIM1_PWMOut_Init( u16 arr, u16 psc, u16 ccp ){    GPIO_InitTypeDef GPIO_InitStructure;    TIM_OCInitTypeDef TIM_OCInitStructure;    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB | RCC_APB2Periph_TIM1, ENABLE );
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init( GPIOB, &GPIO_InitStructure );
    TIM_TimeBaseInitStructure.TIM_Period = arr;    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;    TIM_TimeBaseInit( TIM1, &TIM_TimeBaseInitStructure);
#if (PWM_MODE == PWM_MODE1)  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
#elif (PWM_MODE == PWM_MODE2)    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
#endif
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;    TIM_OCInitStructure.TIM_Pulse = ccp;    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    TIM_OC1Init( TIM1, &TIM_OCInitStructure );
    TIM_CtrlPWMOutputs(TIM1, ENABLE );    TIM_OC1PreloadConfig( TIM1, TIM_OCPreload_Disable );    TIM_ARRPreloadConfig( TIM1, ENABLE );    TIM_Cmd( TIM1, ENABLE );}
void lcd_gpio_init(void){
    GPIO_InitTypeDef  GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_Init(GPIOD, &GPIO_InitStructure);    GPIO_SetBits(GPIOD,GPIO_Pin_13);
    GPIO_ResetBits(GPIOD,GPIO_Pin_13);    //wait at least 100ms for reset    delay_ms(100);    GPIO_SetBits(GPIOD,GPIO_Pin_13);//    TIM1_PWMOut_Init( 1000, 48000-1, 50 );}
void lcd_init(void){    u16 id=0;    lcd_gpio_init();    lcd_fsmc_init();
    lcd_write_cmd(0X04);    id = lcd_read_data();      //dummy read    id = lcd_read_data();      //读到0X85    id = lcd_read_data();      //读取0X85    id <<= 8;    id |= lcd_read_data();     //读取0X52
    printf("id = %x\r\n",id);    delay_ms(50);
    /* Memory Data Access Control */    lcd_write_cmd(0x36);    lcd_write_data(0x00);    /* RGB 5-6-5-bit  */    lcd_write_cmd(0x3A);    lcd_write_data(0x05);    /* Porch Setting */    lcd_write_cmd(0xB2);    lcd_write_data(0x0C);    lcd_write_data(0x0C);    lcd_write_data(0x00);    lcd_write_data(0x33);    lcd_write_data(0x33);    /*  Gate Control */    lcd_write_cmd(0xB7);    lcd_write_data(0x00);    /* VCOM Setting */    lcd_write_cmd(0xBB);    lcd_write_data(0x3F);    /* LCM Control */    lcd_write_cmd(0xC0);    lcd_write_data(0x2C);    /* VDV and VRH Command Enable */    lcd_write_cmd(0xC2);    lcd_write_data(0x01);    /* VRH Set */    lcd_write_cmd(0xC3);    lcd_write_data(0x0D);    /* VDV Set */    lcd_write_cmd(0xC4);    lcd_write_data(0x20);
    /* Frame Rate Control in Normal Mode */    lcd_write_cmd(0xC6);    lcd_write_data(0x03);    //60Hz-0x0F   82Hz-0x07  99Hz-0x03
    /* Power Control 1 */    lcd_write_cmd(0xD0);    lcd_write_data(0xA4);    lcd_write_data(0xA1);    /* Positive Voltage Gamma Control */    lcd_write_cmd(0xE0);    lcd_write_data(0xF0);    lcd_write_data(0x03);    lcd_write_data(0x09);    lcd_write_data(0x03);    lcd_write_data(0x03);    lcd_write_data(0x10);    lcd_write_data(0x2D);    lcd_write_data(0x43);    lcd_write_data(0x3F);    lcd_write_data(0x33);    lcd_write_data(0x0D);    lcd_write_data(0x0E);    lcd_write_data(0x29);    lcd_write_data(0x32);    /* Negative Voltage Gamma Control */    lcd_write_cmd(0xE1);    lcd_write_data(0xF0);    lcd_write_data(0x0C);    lcd_write_data(0x10);    lcd_write_data(0x0E);    lcd_write_data(0x0E);    lcd_write_data(0x0A);    lcd_write_data(0x2D);    lcd_write_data(0x33);    lcd_write_data(0x45);    lcd_write_data(0x3A);    lcd_write_data(0x14);    lcd_write_data(0x19);    lcd_write_data(0x31);    lcd_write_data(0x37);    /* Display Inversion On */    lcd_write_cmd(0x21);    /* Sleep Out */    lcd_write_cmd(0x11);    /* wait for power stability */    delay_ms(100);
    lcd_clear(BLACK);
    /* display on */    GPIO_SetBits(GPIOB,GPIO_Pin_14);    lcd_write_cmd(0x29);

}

/** * Set background color and foreground color * * @param   back    background color * @param   fore    fore color * * @return  void */void lcd_set_color(u16 back, u16 fore){    BACK_COLOR = back;    FORE_COLOR = fore;}
void lcd_display_on(void){    GPIO_SetBits(GPIOB,GPIO_Pin_14);}
void lcd_display_off(void){    GPIO_ResetBits(GPIOB,GPIO_Pin_14);}
/* lcd enter the minimum power consumption mode and backlight off. */void lcd_enter_sleep(void){    GPIO_ResetBits(GPIOB,GPIO_Pin_14);    delay_ms(5);    lcd_write_cmd(0x10);}/* lcd turn off sleep mode and backlight on. */void lcd_exit_sleep(void){    GPIO_SetBits(GPIOB,GPIO_Pin_14);    delay_ms(5);    lcd_write_cmd(0x11);    delay_ms(120);}
/** * Set drawing area * * @param   x1      start of x position * @param   y1      start of y position * @param   x2      end of x position * @param   y2      end of y position * * @return  void */void lcd_address_set(u16 x1, u16 y1, u16 x2, u16 y2){    lcd_write_cmd(0x2a);    lcd_write_data(x1 >> 8);    lcd_write_data(x1);    lcd_write_data(x2 >> 8);    lcd_write_data(x2);
    lcd_write_cmd(0x2b);    lcd_write_data(y1 >> 8);    lcd_write_data(y1);    lcd_write_data(y2 >> 8);    lcd_write_data(y2);
    lcd_write_cmd(0x2C);}
/** * clear the lcd. * * @param   color       Fill color * * @return  void */void lcd_clear(u16 color){    u16 i, j;    u8 data[2] = {0};
    data[0] = color >> 8;    data[1] = color;    lcd_address_set(0, 0, LCD_W - 1, LCD_H - 1);
    /* 5760 = 240*240/20 */
        for (i = 0; i < LCD_W; i++)        {            for (j = 0; j < LCD_H; j++)            {                *(__IO u8*)LCD_DATA=data[0];                *(__IO u8*)LCD_DATA=data[1];            }        }
}
/** * display a point on the lcd. * * @param   x   x position * @param   y   y position * * @return  void */

#define NPT 1024//一次完整采集的采样点数
/******************************************************************函数名称:GetPowerMag()函数功能:计算各次谐波幅值参数说明:备　　注:先将lBufOutArray分解成实部(X)和虚部(Y)，然后计算幅值(sqrt(X*X+Y*Y)*******************************************************************/void GetPowerMag(void){    float X,Y,Mag,magmax;//实部，虚部，各频率幅值，最大幅值    u16 i;    //调用自cr4_fft_1024_stm32  cr4_fft_1024_stm32(fftout, fftin, NPT);    //fftin为傅里叶输入序列数组，ffout为傅里叶输出序列数组      for(i=1; i2; i++)    {    X = (fftout << 16) >> 16;    Y = (fftout >> 16);        Mag = sqrt(X * X + Y * Y);     FFT_Mag=Mag;//存入缓存，用于输出查验    //获取最大频率分量及其幅值    if(Mag > magmax)    {      magmax = Mag;      temp = i;    }    }  F=(u16)(temp*(fre*1.0/NPT));//源代码中此公式有误，将此复制进去    LCD_ShowNum(280,180,F,5,16);}          

u16 magout[NPT];/******************************************************************函数名称:InitBufInArray()函数功能:正弦波值初始化，将正弦波各点的值存入magout[]数组中参数说明:备    注:*******************************************************************/void InitBufInArray(void){    u16 i;    float fx;    for(i=0; isin((PI2*i)/NPT);        magout = (u16)(2048+2048*fx);    }}
/******************************************************************函数名称:sinout()函数功能:正弦波输出参数说明:备    注:将此函数置于定时器中断中，可模拟输出正弦波*******************************************************************/void sinout(void){  static u16 i=0;  DAC_SetChannel1Data(DAC_Align_12b_R,magout);  i++;  if(i>=NPT)    i=0;}