From 77f347fb4e37666e2d687cee99dfa4cb4e441b8a Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Sun, 24 Jan 2021 09:45:29 +0000
Subject: check in humidity sensor + better sleep mode

---
 humidity_sensors/app/awu.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 humidity_sensors/app/awu.c

(limited to 'humidity_sensors/app/awu.c')

diff --git a/humidity_sensors/app/awu.c b/humidity_sensors/app/awu.c
new file mode 100644
index 0000000..18cf1f8
--- /dev/null
+++ b/humidity_sensors/app/awu.c
@@ -0,0 +1,70 @@
+#include "project.h"
+
+/** Contains the different values to write in the APR register (used by AWU_Init function) */
+CONST uint8_t APR_Array[17] =
+    {
+        0, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 61, 23, 23, 62
+    };
+
+/** Contains the different values to write in the TBR register (used by AWU_Init function) */
+CONST uint8_t TBR_Array[17] =
+    {
+        0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 12, 14, 15, 15
+    };
+
+
+FlagStatus AWU_GetFlagStatus(void)
+{
+  return((FlagStatus)(((uint8_t)(AWU->CSR & AWU_CSR_AWUF) == (uint8_t)0x00) ? RESET : SET));
+}
+
+
+INTERRUPT_HANDLER (AWU_IRQHandler, 1)
+{
+  AWU_GetFlagStatus();
+}
+
+
+void AWU_Init(AWU_Timebase_TypeDef AWU_TimeBase)
+{
+  /* Enable the AWU peripheral */
+  AWU->CSR |= AWU_CSR_AWUEN;
+  
+  /* Set the TimeBase */
+  AWU->TBR &= (uint8_t)(~AWU_TBR_AWUTB);
+  AWU->TBR |= TBR_Array[(uint8_t)AWU_TimeBase];
+  
+  /* Set the APR divider */
+  AWU->APR &= (uint8_t)(~AWU_APR_APR);
+  AWU->APR |= APR_Array[(uint8_t)AWU_TimeBase];
+}
+
+
+void AWU_LSICalibrationConfig(uint16_t lsifreqkhz)
+{
+  uint16_t A = 0x0;
+  
+  
+  /* Calculation of AWU calibration value */
+  
+  A = (uint16_t)(lsifreqkhz >> 2U); /* Division by 4, keep integer part only */
+  
+  if ((4U * A) >= ((lsifreqkhz - (4U * A)) * (1U + (2U * A))))
+  {
+    AWU->APR = (uint8_t)(A - 2U);
+  }
+  else
+  {
+    AWU->APR = (uint8_t)(A - 1U);
+  }
+}
+
+
+void awu_init(void)
+{
+
+    AWU_LSICalibrationConfig(128);
+    AWU_Init(AWU_TIMEBASE_1S);
+}
+
+
-- 
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