ADC 320F Especificações descarregar pdf (Página 29)

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1.8.1 ADC_Cal Assembly Routine Method

1.8.2 Pointer to-Function Method

ADC Calibration

The following three steps describe how to call the ADC_cal routine from an application:

Step 1. Add the ADC_cal assembly function to your project. The source is included with the C2833x

C/C++ Header Files and Peripheral Examples (SPRC530 ). The following code shows the

contents of the ADC_cal function. The values 0xAAAA and 0xBBBB are place holders. The

actual values programmed by TI are device specific.

;-----------------------------------------------

; This is the ADC cal routine. This routine is programmed

; into reserved memory by the factory. 0xAAAA and 0xBBBB

; are place holders. The actual values programmed by TI

; are device specific.

; The ADC clock must be enabled before calling

; this function.

;-----------------------------------------------

.def _ADC_cal

.asg "0x711C", ADCREFSEL_LOC

.sect ".adc_cal"

_ADC_cal

MOVW DP, #ADCREFSEL_LOC >> 6

MOV @28, #0xAAAA

MOV @29, #0xBBBB

LRETR

Step 2. Add the .adc_cal section to your linker command file using the following:

MEMORY

{

PAGE 0 :

...

ADC_CAL : origin = 0x380080, length = 0x000009

...

}

SECTIONS

{

...

.adc_cal : load = ADC_CAL, PAGE = 0, TYPE = NOLOAD

...

}

Step 3. Call the ADC_cal function before using the ADC. The ADC clocks must be enabled before

making this call.

extern void ADC_cal(void);

…

EALLOW;

SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;

ADC_cal();

SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 0;

EDIS;

Because the ADC_CAL() routine is already programmed to TI reserved OTP memory by the factory, it can

be called via a pointer to the function by using the following steps:

Step 1. Define ADC_Cal as a pointer to the programmed function in the OTP memory.

#define ADC_Cal (void (*) (void)) 0x380080

Step 2. Call the ADC_Cal() function.

...

EALLOW;

SysCtrlRegs.PCLKCR0.bit.ADCENCLK=1;

(*ADC_Cal) ();

SysCTRLRegs.PCLKCR0.bit.ADCENCLK=0;

EDIS;

SPRU812A – September 2007 – Revised October 2007 Analog-to-Digital Converter (ADC) 29

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