From: Nathael Pajani <nathael.pajani@ed3l.fr>
Date: Tue, 21 Oct 2014 22:21:08 +0000 (+0200)
Subject: Fix problem with ADC at conversion rates above a few hertz (3 or 4Hz) as updated... 
X-Git-Url: http://git.techno-innov.fr/?a=commitdiff_plain;h=461a704a0f9ec4dde3fea3bb4124d57fd157ad80;p=soft%2Flpc122x%2Fcore

Fix problem with ADC at conversion rates above a few hertz (3 or 4Hz) as updated in user manual rev2.1 See Section 19.2 of UM10441 revision 2.1 or newer for more information.
---

diff --git a/core/system.c b/core/system.c
index 5f28188..a11e6ea 100644
--- a/core/system.c
+++ b/core/system.c
@@ -100,6 +100,9 @@ void system_brown_out_detection_config(uint32_t level)
 		sys_ctrl->powerdown_run_cfg |= LPC_POWER_DOWN_BOD;
 		lpc_private.brown_out_detection_enabled = 0;
 	} else {
+		/* Power on Brown-Out Detection.
+		 * (Needed for ADC, See Section 19.2 of UM10441 revision 2.1 or newer for more information) */
+		sys_ctrl->powerdown_run_cfg &= ~(LPC_POWER_DOWN_BOD);
 		lpc_private.brown_out_detection_enabled = 1;
 		/* Configure Brown-Out Detection */
 		/* FIXME */
diff --git a/drivers/adc.c b/drivers/adc.c
index 8d4dfc9..fce8721 100644
--- a/drivers/adc.c
+++ b/drivers/adc.c
@@ -205,6 +205,11 @@ void adc_on(void)
 
 	/* Disable ADC Interrupt */
 	NVIC_DisableIRQ(ADC_IRQ);
+
+	/* Brown-Out detection must be powered to operate the ADC.
+	 * See Section 19.2 of UM10441 revision 2.1 or newer for more information */
+	sys_ctrl->powerdown_run_cfg &= ~LPC_POWER_DOWN_BOD;
+
 	/* Power-up ADC */
 	sys_ctrl->powerdown_run_cfg &= ~LPC_POWER_DOWN_ADC;
 	/* Provide clock to ADC */
diff --git a/include/core/system.h b/include/core/system.h
index 0ce6faf..8686bd6 100644
--- a/include/core/system.h
+++ b/include/core/system.h
@@ -71,7 +71,10 @@ void enter_deep_sleep(void);
 /* Power on or off a subsystem */
 void subsystem_power(uint32_t power_bit, uint32_t on_off);
 
-/* Configure the brown-out detection */
+/* Configure the brown-out detection.
+ * Note: Brown-Out detection must be powered to operate the ADC (See Section 19.2
+ *    of UM10441 revision 2.1 or newer for more information)
+ */
 void system_brown_out_detection_config(uint32_t level);
 
 /***************************************************************************** */