//-----------------------------------------------------------------------------
// T2Cal31x.c
//-----------------------------------------------------------------------------
// Copyright (C) 2004 Silicon Laboratories, Inc.
//
// AUTH: PD
// DATE: 24 OCT 02
//
// This program is used to measure the temperature sensor on an 'F31x
// device.  It uses 1-point calibration and stores the offset value
// in FLASH memory.  The program outputs temperature values in 100ths
// of a degree Celsius with UART.
// Target: C8051F31x
// Tool chain: KEIL C51 6.03 / KEIL EVAL C51
//

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------

#include <c8051f310.h>                 // SFR declarations
#include <intrins.h>
#include <stdio.h>

//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F31x
//-----------------------------------------------------------------------------

sfr16 DP       = 0x82;                 // data pointer
sfr16 TMR2RL   = 0xca;                 // Timer2 reload value
sfr16 TMR2     = 0xcc;                 // Timer2 counter
sfr16 TMR3     = 0x94;                 // Timer3 counter
sfr16 TMR3RL   = 0x92;                 // Timer3 reload value
sfr16 PCA0CP0  = 0xfb;                 // PCA0 Module 0 Capture/Compare
sfr16 PCA0CP1  = 0xe9;                 // PCA0 Module 1 Capture/Compare
sfr16 PCA0CP2  = 0xeb;                 // PCA0 Module 2 Capture/Compare
sfr16 PCA0CP3  = 0xed;                 // PCA0 Module 3 Capture/Compare
sfr16 PCA0CP4  = 0xfd;                 // PCA0 Module 4 Capture/Compare
sfr16 PCA0     = 0xf9;                 // PCA0 counter
sfr16 ADC0     = 0xbd;                 // ADC Data Word Register
sfr16 ADC0GT   = 0xc3;                 // ADC0 Greater-Than
sfr16 ADC0LT   = 0xc5;                 // ADC0 Less-Than
//-----------------------------------------------------------------------------
// Temperature Sensor Calibration PARAMETERS
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------

#define SYSCLK      24500000           // SYSCLK frequency in Hz
#define BAUDRATE        9600           // Baud rate of UART in bps
#define TIMER2_RATE     1000           // Timer 2 overflow rate in Hz


sbit LED = P3^3;                       // LED='1' means ON
//-----------------------------------------------------------------------------
// Temperature Sensor Calibration PARAMETERS
//-----------------------------------------------------------------------------
#define AMB_TEMP           25          // Ambient Calibration Temperature 
                                       // (degC)

#define TEMP_SENSOR_GAIN   3300        // Temp Sensor Gain in (uV / degC)

#define VREF               3300        // ADC Voltage Reference (mV)

#define SOAK_TIME          15          // Soak Time in Seconds


//-----------------------------------------------------------------------------
// Global VARIABLES
//-----------------------------------------------------------------------------

// TEMP_OFFSET allocates two bytes of code memory space in FLASH
// that will be used to store the calibrated temperature value
unsigned int code TEMP_OFFSET = 0xFFFF;

//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------

void SYSCLK_Init (void);
void ADC0_Init (void);
void UART0_Init (void);
void PORT_Init (void);
void Timer2_Init (int);

int get_temp (void);
void calibrate(void);
unsigned int measure(void);
void wait_one_second (void);

//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------

void main (void) {

   unsigned temperature;

   // Disable Watchdog timer
   PCA0MD &= ~0x40;                    // WDTE = 0 (clear watchdog timer 
                                       // enable)
   PORT_Init();                        // Initialize Port I/O
   SYSCLK_Init ();                     // Initialize Oscillator

   ADC0_Init ();                       // Init ADC0
   Timer2_Init(SYSCLK/TIMER2_RATE);    // Init Timer 2 
   UART0_Init();

   AD0EN = 1;                          // Enable ADC0

   if (TEMP_OFFSET == 0xFFFF) {        // TRUE if first-time to execute
      printf ("Calibrating...\n");
      calibrate ();                    // execute calibration sequence
   } else {
      printf ("Not calibrating.\n");
   }

   while (1) {
      // example of how to read the temperature
      LED = 1;
      temperature = get_temp ();
      LED = 0;
      printf ("Temperature = %+02d hundredths degrees C\n", temperature);
   }
}

//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports.
//
// P0.4 - UART TX
// P0.5 - UART RX
// P3.3 - LED

void PORT_Init (void)
{
   XBR0    = 0x01;                     // Enable UART on P0.4(RX) and P0.5(TX)                     
   XBR1    = 0x40;                     // Enable crossbar and enable 
                                       // weak pull-ups
   P0MDOUT |= 0x10;                    // enable UTX as push-pull output
   P3MDOUT |= 0x08;                    // enable LED as push-pull output
}

//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use the internal oscillator
// at its maximum frequency.
// Also enables the Missing Clock Detector.
//

void SYSCLK_Init (void)
{
   OSCICN |= 0x03;                     // Configure internal oscillator for
                                       // its maximum frequency
   RSTSRC = 0x04;                      // Enable missing clock detector

}

//-----------------------------------------------------------------------------
// ADC0_Init ADBUSY, LP tracking, no Interrupt, ADC disabled
//-----------------------------------------------------------------------------
//
// Configure ADC0 to use ADBUSY as conversion source, and to sense the output 
// of the temp sensor.  Disables ADC end of conversion interrupt. Leaves ADC 
// disabled.
//
void ADC0_Init (void)
{
   ADC0CN = 0x40;                      // ADC0 disabled; LP tracking
                                       // mode; ADC0 conversions are initiated 
                                       // on a write to ADBusy
   AMX0P  = 0x1E;                      // Temp sensor selected at + input
   AMX0N  = 0x1F;                      // Single-ended mode

   ADC0CF = (SYSCLK/3000000) << 3;     // ADC conversion clock <= 3MHz   

   ADC0CF &= ~0x04;                    // Make ADC0 right-justified
   REF0CN = 0x0e;                      // enable temp sensor, VREF = VDD, bias
                                       // generator is on.

   EIE1 &= ~0x08;                      // Disable ADC0 EOC interrupt
}

2樓 admin 發表于：2006-8-11 17:31:00
//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
//
// Configure the UART0 using Timer1, for <BAUDRATE> and 8-N-1.
//
void UART0_Init (void)
{