X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcpu%2Fcortex-m3%2Fdrv%2Fadc_sam3.c;h=303689f10ce7745118603f5393ed06d1801e7615;hb=53716ae692a6352c1b230a568f4dbb2a779bda85;hp=7dd48bf650584aeac165613c71d940fe784a3465;hpb=314ed649e840e0f398bf5d1f66cc01db6f8aec01;p=bertos.git

diff --git a/bertos/cpu/cortex-m3/drv/adc_sam3.c b/bertos/cpu/cortex-m3/drv/adc_sam3.c
index 7dd48bf6..303689f1 100644
--- a/bertos/cpu/cortex-m3/drv/adc_sam3.c
+++ b/bertos/cpu/cortex-m3/drv/adc_sam3.c
@@ -58,11 +58,21 @@
 #include <io/cm3.h>
 
 
+/* We use event to signal the end of conversion */
 static Event data_ready;
+/* The last converted data */
 static uint32_t data;
 
 /**
  * ADC ISR.
+ *
+ * The interrupt is connected to ready data, so when the
+ * adc ends the conversion we generate an event and then
+ * we return the converted value.
+ *
+ * \note to clear the Ready data bit and End of conversion
+ * bit we should read the Last Converted Data register, otherwise
+ * the ready data interrupt loop on this call.
  */
 static DECLARE_ISR(adc_conversion_end_irq)
 {
@@ -85,7 +95,6 @@ void adc_hw_select_ch(uint8_t ch)
 	ADC_CHER = BV(ch);
 }
 
-
 /**
  * Start an ADC convertion.
  */
@@ -110,7 +119,6 @@ void adc_hw_init(void)
 	/* Clock ADC peripheral */
 	pmc_periphEnable(ADC_ID);
 
-
 	 /* Reset adc controller */
 	ADC_CR = ADC_SWRST;
 
@@ -134,14 +142,14 @@ void adc_hw_init(void)
 	LOG_INFO("Computed ADC_CLOCK %ld\n", ADC_CLOCK);
 	ADC_MR |= ((ADC_PRESCALER << ADC_PRESCALER_SHIFT) & ADC_PRESCALER_MASK);
 	LOG_INFO("prescaler[%ld]\n", ADC_PRESCALER);
-	ADC_MR |= ((ADC_SUT512 << ADC_STARTUP_SHIFT) & ADC_STARTUP_MASK);
-	LOG_INFO("starup[%d]\n", ADC_SUT512);
-	ADC_MR |= ((ADC_AST17 << ADC_SETTLING_SHIFT) & ADC_SETTLING_MASK);
-	LOG_INFO("sttime[%d]\n", ADC_AST17);
-	ADC_MR |= ((0 << ADC_TRACKTIM_SHIFT) & ADC_TRACKTIM_MASK);
-	LOG_INFO("tracking[%d]\n", 0);
-	ADC_MR |= ((1 << ADC_TRANSFER_SHIFT) & ADC_TRANSFER_MASK);
-	LOG_INFO("tranfer[%d]\n", 1);
+	ADC_MR |= ((CONFIG_ADC_SUT << ADC_STARTUP_SHIFT) & ADC_STARTUP_MASK);
+	LOG_INFO("starup[%d]\n", CONFIG_ADC_SUT);
+	ADC_MR |= ((CONFIG_ADC_STTLING << ADC_SETTLING_SHIFT) & ADC_SETTLING_MASK);
+	LOG_INFO("sttime[%d]\n", CONFIG_ADC_STTLING);
+	ADC_MR |= ((CONFIG_ADC_TRACKTIM << ADC_TRACKTIM_SHIFT) & ADC_TRACKTIM_MASK);
+	LOG_INFO("tracking[%d]\n", CONFIG_ADC_TRACKTIM);
+	ADC_MR |= ((CONFIG_ADC_TRANSFER << ADC_TRANSFER_SHIFT) & ADC_TRANSFER_MASK);
+	LOG_INFO("tranfer[%d]\n", CONFIG_ADC_TRANSFER);
 
 	/* Register and enable irq for adc. */
 	sysirq_setHandler(INT_ADC, adc_conversion_end_irq);