Renesas Single-Chip Microcomputer M38C89T-ADF Manual do Utilizador descarregar pdf (Página 136)

5-20

Rev.1.00 May 22 2012

REJ09B0566

4BUsage Examples

5.8 27BAnalog to Digital Converter

5.8. Analog to Digital Converter

Figure 5-10 shows an example of ADC usage. Interrupt is enabled for ADC unit 0 channels 7, which operate in the single

sample mode.

/* PDL functions */

#include "r_pdl_adc_10_library_SH7267.h"

#include "r_pdl_cpg_library_SH7267.h"

/* PDL device-specific definitions */

#include "r_pdl_definitions.h"

void ADC0_callback(void);

uint8_t adc0_complete;

void main(void)

{

uint16_t result_adc0;

/* Modify the MCU clocks */

R_CPG_Set(18E6, 144E6, 36E6, PDL_CPG_CK_2, PDL_CPG_OUT_CK_01);

/* Configure ADC channel AN1 in One shot mode */

R_ADC_10_Create( PDL_ADC_10_MODE_SINGLE |

PDL_ADC_10_CHANNELS_OPTION_7|PDL_ADC_10_INTERRUPT_ENABLE,

150E3,

ADC0_callback,

);

adc0_complete = 0;

/* Set ADC for conversion */

R_ADC_10_Control(PDL_ADC_10_ON);

/* Start the ADC conversion */

Start_ADC_10();

/* Wait for ADC0 to complete */

while (adc0_complete == 0);

adc0_complete = 0;

/* fetch ADC value */

R_ADC_10_Read(&result_adc0);

/* Shutdown ADC unit 0 */

R_ADC_10_Destroy(0);

while(1);

}

void ADC0_callback(void)

{

adc0_complete = 1;

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