C8051F的ADC问题
void main()
{
// unsigned int j;
Init_Device();
EA=1;
TR2=1;
TI0=1;
while(1)
{
//P4=~P4;
//for(j=0;j<50000;j++);
}
}
void ADC0_ISR (void) interrupt 10
{
static unsigned long accumulator = 0; // Accumulator for averaging
static unsigned int measurements = 2048; // Measurement counter
unsigned long result=0;
unsigned long mV; // Measured voltage in mV
unsigned int i,j;
AD0INT = 0; // Clear ADC0 conv. complete flag
accumulator += ADC0;
measurements--;
if(measurements==0)
{
measurements = 2048;
result = accumulator / 2048;
accumulator=0;
// The 10-bit ADC value is averaged across 2048 measurements.
// The measured voltage applied to P1.4 is then:
//
// Vref (mV)
// measurement (mV) = --------------- * result (bits)
// (2^10)-1 (bits)
mV = result * 3300 / 1023;
printf("P1.1 voltage: %ld mV\n",mV);
for(i=0;i<10000;i++)
for(j=0;j<40;j++);
P4=~P4;
}
// Toggle LED
}
这是一个ADC的实例程序,printf那句在串口调试助手中为什么看不到结果,只能看到LED灯在闪烁
串口没设置好,看波特率和com口是否正确
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include "c8051F340.h" // SFR declarations
#include <stdio.h>
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F34x
//-----------------------------------------------------------------------------
sfr16 TMR2RL = 0xca; // Timer2 reload value
sfr16 TMR2 = 0xcc; // Timer2 counter
sfr16 ADC0 = 0xbd; // ADC0 result
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
#define SYSCLK 12000000 // SYSCLK frequency in Hz
#define BAUDRATE 115200 // Baud rate of UART in bps
sbit LED = P2^2; // LED='1' means ON
//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT_Init (void);
void Timer2_Init(void);
void ADC0_Init(void);
void UART0_Init (void);
//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void)
{
PCA0MD &= ~0x40; // WDTE = 0 (clear watchdog timer
// enable)
SYSCLK_Init (); // Initialize system clock to
// 24.5MHz
PORT_Init (); // Initialize crossbar and GPIO
Timer2_Init(); // Init Timer2 to generate
// overflows to trigger ADC
UART0_Init(); // Initialize UART0 for printf's
ADC0_Init(); // Initialize ADC0
EA = 1; // enable global interrupts
while (1) { // spin forever
}
}
void SYSCLK_Init (void)
{
OSCICN = 0x83; // configure internal oscillator for
// 12MHz / 1
RSTSRC = 0x04; // enable missing clock detector
}
void PORT_Init (void)
{
XBR0 = 0x01; // Enable UART0
XBR1 = 0xC0; // Enable crossbar and weak pull-ups
P0MDOUT |= 0x10; // Set TX pin to push-pull
P2MDOUT |= 0x04; // enable LED as a push-pull output
P1MDIN &= ~0x02; // set P1.1 as an analog input
}
void Timer2_Init (void)
{
TMR2CN = 0x00; // Stop Timer2; Clear TF2;
// use SYSCLK as timebase, 16-bit
// auto-reload
CKCON |= 0x10; // select SYSCLK for timer 2 source
TMR2RL = 65535 - (SYSCLK / 10000); // init reload value for 10uS
TMR2 = 0xffff; // set to reload immediately
TR2 = 1; // start Timer2
}
void ADC0_Init (void)
{
ADC0CN = 0x02; // ADC0 disabled, normal tracking,
// conversion triggered on TMR2 overflow
REF0CN = 0x03; // Enable on-chip VREF and buffer
AMX0P = 0x13; // ADC0 positive input = P1.1
AMX0N = 0x1F; // ADC0 negative input = GND
// i.e., single ended mode
ADC0CF = ((SYSCLK/3000000)-1)<<3; // set SAR clock to 3MHz
ADC0CF |= 0x00; // right-justify results
EIE1 |= 0x08; // enable ADC0 conversion complete int.
AD0EN = 1; // enable ADC0
}
void UART0_Init (void)
{
SCON0 = 0x10; // SCON0: 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 if (SYSCLK/BAUDRATE/2/256 < 48) {
TH1 = -(SYSCLK/BAUDRATE/2/48);
CKCON &= ~0x0B; // T1M = 0; SCA1:0 = 10
CKCON |= 0x02;
} else {
while (1); // Error. Unsupported baud rate
}
TL1 = TH1; // init Timer1
TMOD &= ~0xf0; // TMOD: timer 1 in 8-bit autoreload
TMOD |= 0x20;
TR1 = 1; // START Timer1
TI0 = 1; // Indicate TX0 ready
}
void ADC0_ISR (void) interrupt 10
{
static unsigned long accumulator = 0; // Accumulator for averaging
static unsigned int measurements = 2048; // Measurement counter
unsigned long result=0;
unsigned long mV; // Measured voltage in mV
AD0INT = 0; // Clear ADC0 conv. complete flag
accumulator += ADC0;
measurements--;
if(measurements==0)
{
measurements = 2048;
result = accumulator / 2048;
accumulator=0;
mV = result * 2440 / 1023;
printf("P1.1 voltage: %ld mV\n",mV);
}
LED=~LED; // Toggle LED
}
//-----------------------------------------------------------------------------
// End Of File
//-----------------------------------------------------------------------------
开帖的程序发错了,我又发了个带串口通信的,能帮忙看看嘛?
找到原因了,我用VSPD模拟了一对串口,跟我的串口重复了
进来学学、、、、、、、
kankan
不错不错,学习咯~~