一、特性參數
1、專門用來用音頻處理的AD芯片
2、內部固定好8K的采樣速率
3、8位AD芯片
二、內部結構圖
三、芯片管腳圖
四、管腳功能說明
| 管腳名稱 | 功能 |
| IN0~IN7 | 數據輸入端 |
| ABC | 數據輸入端口選擇 |
| ST | ST 為轉換啟動信號。當ST 上跳沿時，所有內部寄存器清零；下跳沿時，開始進行A/D 轉換；在轉換期間，ST 應保持低電平。 |
| EOC | EOC 為轉換結束信號。當EOC 為高電平時，表明轉換結束；否則，表明正在進行A/D 轉換 |
| OE | OE為輸出允許信號，用於控制三條輸出鎖存器向單片機輸出轉換得到的數據。OE＝1，輸出轉換得到的數據；OE＝0，輸出數據線呈高阻狀態。D7－D0 為數字量輸出線。 |
| D7－D0 | 數字量輸出線 |
| CLK | 時鍾輸入信號線。因ADC0809的內部沒有時鍾電路，所需時鍾信號必須由外界提供，通常使用頻率為500KHZ |
| VREF（＋） | 參考電壓輸入正極 |
| VREF（－） | 參考電壓輸入負極 |
五、STM32F103ZE驅動程序
#include "stm32f10x.h" #define CLK GPIO_Pin_0 //#define B GPIO_Pin_1 //#define C GPIO_Pin_2 #define ALE GPIO_Pin_4 //#define IN0 GPIO_Pin_4 #define ST GPIO_Pin_5 #define OE GPIO_Pin_6 //#define A GPIO_Pin_7 #define D0 GPIO_Pin_0 #define D1 GPIO_Pin_1 #define D2 GPIO_Pin_2 #define D3 GPIO_Pin_3 #define D4 GPIO_Pin_4 #define D5 GPIO_Pin_5 #define D6 GPIO_Pin_6 #define D7 GPIO_Pin_7 #define EOC GPIO_Pin_8 double val=0; void delay(u32 kk) { while(kk--); } /* const unsigned short CLK= GPIO_Pin_0; const unsigned short B=GPIO_Pin_1; const unsigned short C=GPIO_Pin_2; const unsigned short ALE=GPIO_Pin_3; const unsigned short IN0=GPIO_Pin_4; const unsigned short ST=GPIO_Pin_5; const unsigned short OE=GPIO_Pin_6; const unsigned short A=GPIO_Pin_7; const unsigned short D0=GPIO_Pin_0; const unsigned short D1=GPIO_Pin_1; const unsigned short D2=GPIO_Pin_2; const unsigned short D3=GPIO_Pin_3; const unsigned short D4=GPIO_Pin_4; const unsigned short D5=GPIO_Pin_5; const unsigned short D6=GPIO_Pin_6; const unsigned short D7=GPIO_Pin_7; const unsigned short EOC=GPIO_Pin_8; */ void ad_init() { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_ResetBits(GPIOA, ALE); // GPIO_ResetBits(GPIOA, A); // GPIO_ResetBits(GPIOA, B); // GPIO_ResetBits(GPIOA, C); //delay(10); GPIO_SetBits(GPIOA, ALE); //CLK } void adc0809_input() { //ST²úÉúÉÏÉýÑغÍϽµÑØ GPIO_ResetBits(GPIOA, ST); delay(10); GPIO_SetBits(GPIOA,ST); delay(10); GPIO_ResetBits(GPIOA, ST); delay(10); while(GPIO_ReadInputDataBit(GPIOB, EOC)==0); GPIO_SetBits(GPIOA,OE); val=GPIO_ReadInputDataBit(GPIOB, D0)*0x0001+ GPIO_ReadInputDataBit(GPIOB, D1)*0x0002+ GPIO_ReadInputDataBit(GPIOB, D2)*0x0004+ GPIO_ReadInputDataBit(GPIOB, D3)*0x0008+ GPIO_ReadInputDataBit(GPIOB, D4)*0x0010+ GPIO_ReadInputDataBit(GPIOB, D5)*0x0020+ GPIO_ReadInputDataBit(GPIOB, D6)*0x0040+ GPIO_ReadInputDataBit(GPIOB, D7)*0x0080; GPIO_ResetBits(GPIOA,OE); //val=val*2*0.98; } void timer_init() //¶¨Ê±Æ÷ÖжÏÅäÖà { NVIC_InitTypeDef NVIC_InitStructure; //ÅäÖÃÖжϽṹ TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //ÅäÖÃÄÚ²¿Ê±ÖÓ NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0; NVIC_InitStructure.NVIC_IRQChannelSubPriority=0; NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; NVIC_Init(&NVIC_InitStructure);//¶¨Ê±Æ÷3µÄÖжϳõʼ»¯ TIM_TimeBaseStructure.TIM_Period=100; //ÓëÏÂÒ»ÐÐÓï¾äÅäºÏ£¬µ¥Æ¬»úʱÖÓÐźÅĬÈÏÇé¿öÏÂÊÇ72MHz£¬¸Ä10000Õâ¸öÊý¿ÉÒÔÉèÖÃÖжÏʱ¼ä TIM_TimeBaseStructure.TIM_Prescaler=72; //ÕâÐÐÒ²¿ÉÒԸģ¬µ«ÊÇΪÁËÊý¾Ý·ÖÅäÇå³þ£¬»¹ÊÇÉÏÒ»ÐÐÕû°ÙÕû°ÙµØ¸Ä±È½ÏºÃ TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); TIM_ITConfig(TIM3,TIM_IT_Update|TIM_IT_Trigger,ENABLE); TIM_Cmd(TIM3, ENABLE); } int i=1; void TIM3_IRQHandler() { if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET) //È·¶¨½øÈëÁËÕâ¸öÖÐ¶Ï { TIM_ClearITPendingBit(TIM3, TIM_IT_Update); // Çå³ý±êÖ¾£¬±£ÏÕÆð¼ûÒª¼Ó adc0809_input(); if(i==1) { GPIO_SetBits(GPIOA, GPIO_Pin_8); i=0; } else { i=1; GPIO_ResetBits(GPIOA, GPIO_Pin_8); } } } void ADC0809_Clock() { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); //PWM--->100Hz TIM_TimeBaseStructure.TIM_Period=10; TIM_TimeBaseStructure.TIM_Prescaler=12; TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); // //PA6--->50% //????? TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse=5; //pulse????period?????? TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High; TIM_OC1Init(TIM2, &TIM_OCInitStructure); // //PA7--->40% // TIM_OCInitStructure.TIM_Pulse=40; // TIM_OC2Init(TIM3, &TIM_OCInitStructure); // //PB0--->60% // TIM_OCInitStructure.TIM_Pulse=60; // TIM_OC3Init(TIM3, &TIM_OCInitStructure); // //PB1--->80% // TIM_OCInitStructure.TIM_Pulse=80; // TIM_OC4Init(TIM3, &TIM_OCInitStructure); TIM_Cmd(TIM2, ENABLE); } int main() { ad_init(); GPIO_SetBits(GPIOA, GPIO_Pin_3); ADC0809_Clock(); timer_init(); while(1) { } }