C8051F的ADC问题

1楼-- · 2019-07-16 08:55

串口没设置好，看波特率和com口是否正确

2楼-- · 2019-07-16 12:28

//-----------------------------------------------------------------------------
// 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 ",mV);
}

LED=~LED;                         // Toggle LED
}

//-----------------------------------------------------------------------------
// End Of File
//-----------------------------------------------------------------------------