AN1711 datasheet(37/40 Pages) STMICROELECTRONICS

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SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS

5.4 INTERRUPTS

Only one interrupt is used for Timer A. This is used for demonstrating “Wait for interrupt”. You

are advised to make necessary changes in the software when using this technique for ex-

ample, in PRM file etc.

5.5 CODE SIZE AND EXECUTION TIME

The following table summarises the approximate code size and execution time. Depending on

the compiler and memory placement, these values can change.

The RAM requirements are not provided and you can choose to place the variables as global

or local. For techniques which require arrays, the size of array will define the RAM require-

ments and it is left up to the user.

Table 6. Code size and execution time

No.

Function Name

Code size

(Bytes)

Execution

time

(us)

Averaging technique

ADC_get_avgdata

311

Averaging using queue implementation

ADC_fill_Q

178

ADC_avg_Q

104

Noise filtering technique

ADC_getdata_filter_noise

155

717

Histogram technique

ADC_getdata_histgrm

669

6550

Execute from RAM

ADC_do_Conversion

copy_code_ROM_2_RAM

109

ADC_get_avg_execRAM

541

Zone compensation

ADC_zone_compensation

149

Wait for Interrupt technique

10.

TimerA_Init

11.

ADC_conversion_WFI

36**

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