at32 adc等16次转换结束后开中断

Signed-off-by: huhui <huhui@sharkgulf.com>

Applications/bsp/at32/adc.c

@@ -407,7 +407,7 @@ u16 adc_get_5v_ref(void) {
 }
 
 void adc_start_convert(void) {
-	int drop = 2;
+	int drop = 16;
     /* clear the ADC flag */
     adc_flag_clear(ADC1, ADC_PCCE_FLAG);
     adc_flag_clear(ADC2, ADC_PCCE_FLAG);