adc.c

基于TMS320F2812 的精密温度控制程序代码

/*********************************************************************
* File: Adc.c                                                        *
* Description: Contains ADC functions used in the TEC application.   *
* DSP: TMS320F2812                                                   *
* Author: David M. Alter                                             *
* Function List: DelayUs()                                           *
*                InitAdc()                                           *
* History:                                                           *
*   11/05/02 - Original, based on DSP28 header files v0.58 (D. Alter)*
*   03/20/03 - Corrected ADC setup to free run on emu halt (D. Alter)*
* Notes: none                                                        *
*********************************************************************/

/*********************************************************************
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#include "Device.h"

/*********************************************************************
* Function: DelayUs()                                                *
* Description: Implements a time delay.                              *
* DSP: TMS320F2812                                                   *
* Include files: none                                                *
* Function Prototype: void DelayUs(volatile Uint16)                  *
* Useage: DelayUs(Usec);                                             *
* Input Parameters: volatile Uint16 Usec = time delay (microseconds) *
* Return Value: none                                                 *
* Notes: The execution time of this routine is rough, based upon a   *
*        150MHz CPUCLK.  It has been tested using all optimization   *
*        levels of the compiler to give approximately a 1us inner    *
*        loop.                                                       *
*********************************************************************/
void DelayUs( volatile Uint16 Usec )
{
    while( Usec-- )					// 1us loop at 150MHz CPUCLK
	{
		asm(" RPT #139 || NOP");
	}

} // end DelayUs()


/*********************************************************************
* Function: InitAdc()                                                *
* Description: Initializes the ADC.                                  *
* DSP: TMS320F2812                                                   *
* Author: David M. Alter                                             *
* Include files: none                                                *
* Function Prototype: void InitAdc(void)                             *
* Useage: InitAdc();                                                 *
* Input Parameters: none                                             *
* Return Value: none                                                 *
* Notes: none                                                        *
*********************************************************************/
void InitAdc(void)
{

/*** Reset the ADC module ***/
	AdcRegs.ADCTRL1.bit.RESET = 1;		// Reset the ADC module
	asm(" RPT #10 || NOP");				// Must wait 12-cycles (worst-case) for ADC reset to take effect
	
/*** Must follow the proper ADC power-up sequence ***/
	AdcRegs.ADCTRL3.all = 0x00C8;		// first power-up ref and bandgap circuits
/*
 bit 15-8      0's:    reserved
 bit 7         1:      ADCRFDN, reference power, 1=power on
 bit 6         1:      ADCBGDN, bandgap power, 1=power on
 bit 5         0:      ADCPWDN, main ADC power, 1=power on
 bit 4-1       0100:   ADCCLKPS, clock prescaler, FCLK=HSPCLK/(2*ADCCLKPS)
 bit 0         0:      SMODE_SEL, 0=sequential sampling, 1=simultaneous sampling
*/

	DelayUs(5000);						// Wait 5ms before setting ADCPWDN
	AdcRegs.ADCTRL3.bit.ADCPWDN = 1;	// Set ADCPWDN=1 to power main ADC
	DelayUs(20);						// Wait 20us before using the ADC

/*** Configure the other ADC register ***/
	AdcRegs.ADCMAXCONV.all = 0x0000;
/*
 bit 15-7      0's:    reserved
 bit 6-4       000:    MAX_CONV2 value
 bit 3-0       0000:   MAX_CONV1 value (0 means 1 conversion)
*/

	AdcRegs.ADCCHSELSEQ1.bit.CONV00 = ADC_channel;	// channel to convert

	AdcRegs.ADCTRL1.all = 0x0710;
/*
 bit 15        0:      reserved
 bit 14        0:      RESET, 0=no action, 1=reset ADC
 bit 13-12     00:     SUSMOD, 00=do not stop on emulator suspend
 bit 11-8      0111:   ACQ_PS (Acquisition), 0111 = 8 x ADCCLK
 bit 7         0:      CPS (Core clock), 0: ADCCLK=FCLK/1, 1: ADCCLK=FCLK/2
 bit 6         0:      CONT_RUN, 0=start/stop mode, 1=continuous run
 bit 5         0:      reserved
 bit 4         1:      SEQ_CASC, 0=dual sequencer, 1=cascaded sequencer
 bit 3-0       0000:   reserved
*/

	AdcRegs.ADCTRL2.all = 0x0900;
/*
 bit 15        0:      EVB_SOC_SEQ, 0=no action
 bit 14        0:      RST_SEQ1, 0=no action
 bit 13        0:      SOC_SEQ1, 0=clear any pending SOCs
 bit 12        0:      reserved
 bit 11        1:      INT_ENA_SEQ1, 1=enable interrupt
 bit 10        0:      INT_MOD_SEQ1, 0=int on every SEQ1 conv
 bit 9         0:      reserved
 bit 8         1:      EVA_SOC_SEQ1, 1=SEQ1 start from EVA
 bit 7         0:      EXT_SOC_SEQ1, 1=SEQ1 start from ADCSOC pin
 bit 6         0:      RST_SEQ2, 0=no action
 bit 5         0:      SOC_SEQ2, no effect in cascaded mode
 bit 4         0:      reserved
 bit 3         0:      INT_ENA_SEQ2, 0=int disabled
 bit 2         0:      INT_MOD_SEQ2, 0=int on every other SEQ2 conv
 bit 1         0:      reserved
 bit 0         0:      EVB_SOC_SEQ2, 1=SEQ2 started by EVB
*/

/*** Enable the ADC interrupt ***/
	PieCtrlRegs.PIEIER1.bit.INTx6 = 1;	// Enable ADCINT in PIE group 1
	IER |= 0x0001;						// Enable INT1 in IER to enable PIE group

} // end AdcInit()


/*** end of file *****************************************************/