?? f350_adc_buffered_2.c
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//插上短路環(huán)J4,J7,J8的2,3腳,J9的2,3腳,J15,連上232串口線。
//AIN1與AGND連接,在AIN0輸入0-2.5V之間的電壓。
// Includes
//-----------------------------------------------------------------------------
#include <c8051f350.h> // SFR declarations
#include <stdio.h> // Standard I/O Library
#include <math.h>
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F35x
//-----------------------------------------------------------------------------
sfr16 DP = 0x82; // data pointer
sfr16 TMR3RL = 0x92; // Timer3 reload value
sfr16 TMR3 = 0x94; // Timer3 counter
sfr16 ADC0DEC = 0x9a;
sfr16 TMR2RL = 0xca; // Timer2 reload value
sfr16 TMR2 = 0xcc; // Timer2 counter
sfr16 PCA0CP0 = 0xe9; // PCA0 Module 1 Capture/Compare
sfr16 PCA0CP1 = 0xeb; // PCA0 Module 2 Capture/Compare
sfr16 PCA0CP2 = 0xed; // PCA0 Module 2 Capture/Compare
sfr16 PCA0 = 0xf9; // PCA0 counter
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
#define SYSCLK 49000000 // SYSCLK frequency (Hz)
#define BAUDRATE 115200 // UART0 Baudrate (bps)
#define MDCLK 2457600 // Modulator Clock (Hz)
#define OWR 10 // desired Output Word Rate in Hz
#define VREF 2530 // External VREF (x 10^-2 V)
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
long xdata sample_array[128];
long ADC_OutputVal=0; // Concatenated ADC output value
int cyz;
//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT7_Init (void);
void ADC0_Init (void);
void IDA0_Init (void);
void UART0_Init (void);
void YJ_Init(void);
void Write_CHAR(unsigned char yjchar);
//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void) {
unsigned int i,g;
float average;
unsigned char e11,e22,e33,e44;
unsigned int e1,e2,e3,e4;
PCA0MD &= ~0x40; // disable watchdog timer
SYSCLK_Init(); // Initialize system clock to 49 MHz
PORT7_Init(); // Initialize crossbar and GPIO
for(i=0;i<128;i++)
{
sample_array[i]=0;
}
ADC0_Init(); // 初始化ADC0
UART0_Init(); // 初始化UART0
EA = 1; // 使能總中斷
printf("\nMeasurements using the 24-bit ADC in C8051F350\n");
printf("\nCalibrating ...\n");
EIE1 &= ~0x08; // 不使能 ADC0 中斷
ADC0MD |= 0x01; // 完全內部校準
while (!AD0CALC); // 等待轉換完成
ADC0MD &= ~0x07; // ADC0 為理想模式
printf("Calibration complete\n\n");
AD0INT = 0; // clear pending sample indication
ADC0MD |= 0x83; // 啟動連續(xù)轉換
while(1) //處理采樣值
{
// 捕捉128次采樣
printf ("Collecting 128 samples...\n");
for (i = 0; i < 128; i++)
{
while(!AD0INT); //等待轉換完成
AD0INT = 0; //清 AD0 中斷標志
// concatenate ADC0 data bytes to form the 24-bit value
ADC_OutputVal = ADC0H;
ADC_OutputVal =ADC_OutputVal<< 16;
ADC_OutputVal += (long)ADC0L + ((long)ADC0M << 8);
sample_array[i] = ADC_OutputVal;
}
for(i=0;i<128;i++)
{
average=average+(float)sample_array[i];
}
average=average/128;
average=average/256/256/256;
average=average*VREF;
average=average*2;
average=average;
printf("ADC Vin = %6d mV",(int)average);
cyz=(int)average;
e1=cyz/1000;
e2=(cyz-1000*e1)/100;
e3=(cyz-1000*e1-100*e2)/10;
e4=cyz-1000*e1-100*e2-10*e3;
g=0;
do
{
if(g==e1)e11=0x30+g;
if(g==e2)e22=0x30+g;
if(g==e3)e33=0x30+g;
if(g==e4)e44=0x30+g;
g++;
}while(g<10);
YJ_Init(); //液晶顯示采樣值
for(i=0;i<4000;i++);
for(i=0;i<4000;i++);
for(i=0;i<4000;i++);
Write_CHAR(e11);
Write_CHAR(0x2e);
Write_CHAR(e22);
Write_CHAR(e33);
Write_CHAR(e44);
Write_CHAR(0x56);
for(i=0;i<4000;i++);
for(i=0;i<4000;i++);
for(i=0;i<4000;i++);
}
}
//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use the internal 24.5MHz
// oscillator as its clock source, with x 2 multiply for
// 49 MHz operation. Also enables missing clock detector reset.
//
void SYSCLK_Init (void)
{
unsigned i;
OSCICN = 0x80; // enable intosc
CLKSEL = 0x00; // select intosc as sysclk source
// INTOSC configure
OSCICN = 0x83;
// PLL configure
CLKMUL = 0x00; // Reset Clock Multiplier
CLKMUL &= ~0x03; // select INTOSC / 2 as PLL source
CLKMUL |= 0x80; // Enable 4x Multipler (MULEN = 1)
for (i = 0; i < 125; i++); // Delay for at least 5us
CLKMUL |= 0xC0; // Initialize Multiplier
while (!(CLKMUL & 0x20)); // Poll for Multiply Ready
// SYSCLK configure
VDM0CN = 0x80; // enable VDD monitor
RSTSRC = 0x06; // enable missing clock detector
// and VDD monitor reset sources
CLKSEL = 0x02; // select PLL as clock source
}
//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports.
// P0.4 - TX0 (push-pull)
// P0.5 - RX0
void PORT7_Init (void)
{
XBR0 |= 0x01; // UART0 Selected
XBR1 |= 0x40; // Enable crossbar and weak pull-ups
P0MDOUT |= 0xD0; // TX, LEDs = Push-pull
}
//-----------------------------------------------------------------------------
// ADC0_Init extVREF Bipolar AIN0.1-AIN0.0
//-----------------------------------------------------------------------------
//
// This function initializes the ADC to measure across AIN0.1 and AIN0.0
// on the Target Board (Differential measurements, Bipolar codes)
void ADC0_Init (void)
{
unsigned ADC0_decimation;
REF0CN &= ~0x01; // disable internal vref
// REF0CN |= 0x01; // (enable if using internal vref)
// ADC0CN = 0x00; // unipolar output codes, GAIN=1
ADC0CN = 0x10; // Bipolar output codes, GAIN=1
// ADC0CF = 0x00; // interrupts upon SINC3 filter output
// and uses internal VREF
ADC0CF = 0x04; // interrupts upon SINC3 filter output
// and uses external VREF
ADC0CLK = (SYSCLK/MDCLK)-1; // Ideally, MDCLK = 2.4576 MHz
// Generate MDCLK for modulator.
// program decimation rate for desired OWR
ADC0_decimation = (unsigned long) SYSCLK/ (unsigned long) OWR /
(unsigned long) (ADC0CLK+1)/(unsigned long)128;
ADC0_decimation--;
ADC0DEC = ADC0_decimation;
ADC0BUF = 0x00; // 關閉輸入緩沖
ADC0MUX = 0x01; // 差分輸入
// AIN+ => AIN0.0
// AIN- => AIN0.1
ADC0MD |= 0x80; // 使能(IDLE Mode)
}
//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
//
// Configure the UART0 using Timer1, for <BAUDRATE> and 8-N-1.
//
void UART0_Init (void)
{
SCON0 = 0x10; // 8-bit variable bit rate
// level of STOP bit is ignored
// RX enabled
// ninth bits are zeros
// clear RI0 and TI0 bits
if (SYSCLK/BAUDRATE/2/256 < 1)
{
TH1 = -(SYSCLK/BAUDRATE/2);
CKCON |= 0x08; // T1M = 1; SCA1:0 = xx
}
else if (SYSCLK/BAUDRATE/2/256 < 4)
{
TH1 = -(SYSCLK/BAUDRATE/2/4);
CKCON &= ~0x0B; // T1M = 0; SCA1:0 = 01
CKCON |= 0x01;
}
else if (SYSCLK/BAUDRATE/2/256 < 12)
{
TH1 = -(SYSCLK/BAUDRATE/2/12);
CKCON &= ~0x0B; // T1M = 0; SCA1:0 = 00
}
else
{
TH1 = -(SYSCLK/BAUDRATE/2/48);
CKCON &= ~0x0B; // T1M = 0; SCA1:0 = 10
CKCON |= 0x02;
}
TL1 = TH1; // init Timer1
TMOD &= ~0xf0; // TMOD: timer 1 in 8-bit autoreload
TMOD |= 0x20;
TR1 = 1; // START Timer1
TI0 = 1; // Indicate TX0 ready
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