C8051F060 PID温度控制

//----------------------------------------------------------------------------- // F06x_ADC0_ExternalInput.c //----------------------------------------------------------------------------- // Copyright 2005 Silicon Laboratories, Inc. // http://www.silabs.com // // Program Description: // // This program measures the voltage on an external ADC input and prints the // result to a terminal window via the UART. // 作为电压输入ADC然后在终端上显示。 // The system is clocked using the internal 24.5MHz oscillator. 系统时钟内部晶振24.5 // Results are printed to the UART from a loop with the rate set by a delay // based on Timer 2. This loop periodically reads the ADC value from a global // variable, Result. // // The ADC makes repeated measurements at a rate determined by SAMPLE_RATE // using Timer 3. The end of each ADC conversion initiates an interrupt which // calls an averaging function. // <INT_DEC> samples are averaged then the Result value updated. // // For each power of 4 of <INT_DEC>, you gain 1 bit of effective resolution. // For example, <INT_DEC> = 256 gain you 4 bits of resolution: 4^4 = 256. // // The ADC input multiplexer is set for a single-ended input at AIN2.1. // The input amplifier is set for unity gain so a voltage range of 0 to Vref // (2.43V) may be measured. Although voltages up to Vdd may be applied without // damaging the device, only the range 0 to Vref may be measured by the ADC. // // A 100kohm potentiometer may be connected as a voltage divider between // VREF and AGND as shown below: (minimum value = 12Kohms as the maximum // recommended current through the Vref is of 200uA @2.4V) // // --------- // | // 8 o| AGND ----| // o| VREF ----|<-| // o| AIN2.1 | | // o| | | // o| -------- // o| // o| // 1 o| // | //---------- // // How To Test: // // 1) Download code to a 'F06x device that is connected to a UART transceiver // 2) Connect serial cable from the transceiver to a PC // 3) On the PC, open HyperTerminal (or any other terminal program) and connect // to the COM port at <BAUDRATE> and 8-N-1 // 4) Connect a variable voltage source (between 0 and Vref) // to AIN 2.1, or a potentiometer voltage divider as shown above. // 5) HyperTerminal will print the voltage measured by the device if // everything is working properly // // FID: 06X000022 // Target: C8051F06x // Tool chain: Keil C51 7.50 / Keil EVAL C51 // Command Line: None // // // Release 1.0 // -Initial Revision (CG) // -8-June-06 // //----------------------------------------------------------------------------- // Includes //----------------------------------------------------------------------------- #include <c8051F060.h> // SFR declarations #include <stdio.h> //----------------------------------------------------------------------------- // 16-bit SFR Definitions for 'F06x //----------------------------------------------------------------------------- //sfr16 ADC2L = 0xbe; // ADC2 data sfr16 RCAP2 = 0xca; // Timer2 capture/reload sfr16 RCAP3 = 0xca; // Timer3 capture/reload sfr16 TMR2 = 0xcc; // Timer2 sfr16 TMR3 = 0xcc; // Timer3 sfr16 ADC2=0xbe; //----------------------------------------------------------------------------- // Global Constants //----------------------------------------------------------------------------- #define BAUDRATE 9600 // Baud rate of UART in bps #define SYSCLK 24500000 // System Clock #define SAMPLE_RATE 50000 // Sample frequency in Hz #define INT_DEC 256 // Integrate and decimate ratio #define SAR_CLK 2500000 // Desired SAR clock speed #define SAMPLE_DELAY 50 // Delay in ms before taking sample sbit LED = P2^0; // LED='1' means ON sbit LED1 = P2^1; sbit SW1 = P3^7; // SW1='0' means switch pressed //----------------------------------------------------------------------------- // Function Prototypes //----------------------------------------------------------------------------- void OSCILLATOR_Init (void); void PORT_Init (void); void UART1_Init (void); void ADC2_Init (void); void TIMER3_Init (void); void TIMER3_ISR (void); void ADC2_ISR (void); void Wait_MS (unsigned int ms); //----------------------------------------------------------------------------- // Global Variables //----------------------------------------------------------------------------- long Result; // ADC0 decimated value int lchhxy=0; int lch=0; //----------------------------------------------------------------------------- // main() Routine //----------------------------------------------------------------------------- void main (void) { long measurement=0; // Measured voltage in mV // long Mu,Md; WDTCN = 0xde; // Disable watchdog timer WDTCN = 0xad; OSCILLATOR_Init (); // Initialize oscillator PORT_Init (); // Initialize crossbar and GPIO UART1_Init (); // Initialize UART1 TIMER3_Init (); // Initialize Timer3 to overflow at // sample rate 用TM3满足采样频率。 ADC2_Init (); // Init ADC SFRPAGE = ADC2_PAGE; AD2EN = 1; // Enable ADC EA = 1; // Enable global interrupts while (1) { EA = 0; // Disable interrupts // The 10-bit ADC2 value is averaged across INT_DEC measurements. // The result is then stored in Result, and is right-justified // The measured voltage applied to AIN 2.1 is then: // // Vref (mV) // measurement (mV) = --------------- * Result (bits) // (2^10)-1 (bits) if(lchhxy==1) { measurement = Result; lch=1; lchhxy=0; } EA = 1; if(lch==1) { // Re-enable interrupts measurement = (measurement*2.43)/(2^11); // 将偏差校正到 0度 0V measurement = (measurement -0.776)/0.00289; // 2.5mV/摄氏度 /* Mu=measurement/100; Md= measurement- Mu*100; */ SFRPAGE = UART1_PAGE; printf("Temperature: %ld C\n",measurement); SFRPAGE = CONFIG_PAGE; LED = ~LED; // LED reflects state of switch lch=0; } Wait_MS(SAMPLE_DELAY); // Wait 50 milliseconds before taking // another sample } } //----------------------------------------------------------------------------- // Initialization Subroutines //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // OSCILLATOR_Init //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // This function initializes the system clock to use the internal oscillator // at 24.5 MHz. // //----------------------------------------------------------------------------- void OSCILLATOR_Init (void) { char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page SFRPAGE = CONFIG_PAGE; // Set SFR page OSCICN = 0x83; // Set internal oscillator to run // at its maximum frequency CLKSEL = 0x00; // Select the internal osc. as