Minor fixes in AT91 ADC module.

[bertos.git] / bertos / cpu / arm / drv / adc_at91.h

diff --git a/bertos/cpu/arm/drv/adc_at91.h b/bertos/cpu/arm/drv/adc_at91.h
index 07ef6a40927cd99e98d302d9f9ccb5036d006635..2ec0cdb595af0f676a6ab3b2b13f91c4ad1f1f72 100644 (file)
--- a/bertos/cpu/arm/drv/adc_at91.h
+++ b/bertos/cpu/arm/drv/adc_at91.h
@@ -57,9 +57,10 @@
  * Macro for computing correct value to write into ADC
  * register.
  */
-#define ADC_COMPUTED_PRESCALER    ((CPU_FREQ/(2 * CONFIG_ADC_CLOCK)) - 1)
-#define ADC_COMPUTED_STARTUPTIME  (((CONFIG_ADC_STARTUP_TIME * CONFIG_ADC_CLOCK)/ 8000000UL) - 1)
-#define ADC_COMPUTED_SHTIME       (((CONFIG_ADC_SHTIME * CONFIG_ADC_CLOCK)/1000000000UL) - 1)
+#define ADC_COMPUTED_PRESCALER    (DIV_ROUNDUP(CPU_FREQ, 2 * CONFIG_ADC_CLOCK) - 1)
+#define ADC_COMPUTED_CLOCK        (CPU_FREQ / ((ADC_COMPUTED_PRESCALER + 1) * 2))
+#define ADC_COMPUTED_STARTUPTIME  (((CONFIG_ADC_STARTUP_TIME * ADC_COMPUTED_CLOCK) / 8000000UL) - 1)
+#define ADC_COMPUTED_SHTIME       ((uint32_t)((CONFIG_ADC_SHTIME * (uint64_t)ADC_COMPUTED_CLOCK) / 1000000000UL) - 1)
 
 /**
  * Init pins macro for adc.