From fb71edfb6bc0702aa2ee1cc73d0822bbc37674ad Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Sun, 24 Jan 2021 09:23:12 +0000
Subject: working-ish sensor

---
 humidity_sensors/app/gpio.c | 77 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 humidity_sensors/app/gpio.c

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

diff --git a/humidity_sensors/app/gpio.c b/humidity_sensors/app/gpio.c
new file mode 100644
index 0000000..38d57d3
--- /dev/null
+++ b/humidity_sensors/app/gpio.c
@@ -0,0 +1,77 @@
+#include "project.h"
+
+u8
+GPIO_ReadInputData (GPIO_TypeDef *GPIOx)
+{
+  return ((u8) GPIOx->IDR);
+}
+
+void
+GPIO_WriteHigh (GPIO_TypeDef *GPIOx, GPIO_Pin_TypeDef PortPins)
+{
+  GPIOx->ODR |= (u8) PortPins;
+}
+
+void
+GPIO_WriteLow (GPIO_TypeDef *GPIOx, GPIO_Pin_TypeDef PortPins)
+{
+  GPIOx->ODR &= (u8) (~PortPins);
+}
+
+
+/**
+  * @brief  Initializes the GPIOx according to the specified parameters.
+  * @param  GPIOx : Select the GPIO peripheral number (x = A to I).
+  * @param  GPIO_Pin : This parameter contains the pin number, it can be any value
+  *         of the @ref GPIO_Pin_TypeDef enumeration.
+  * @param  GPIO_Mode : This parameter can be a value of the
+  *         @ref GPIO_Mode_TypeDef enumeration.
+  * @retval None
+  */
+
+void
+GPIO_Init (GPIO_TypeDef *GPIOx, GPIO_Pin_TypeDef GPIO_Pin,
+           GPIO_Mode_TypeDef GPIO_Mode)
+{
+  /*----------------------*/
+  /* Check the parameters */
+  /*----------------------*/
+
+  /* Reset corresponding bit to GPIO_Pin in CR2 register */
+  GPIOx->CR2 &= (u8) (~ (GPIO_Pin));
+
+  /*-----------------------------*/
+  /* Input/Output mode selection */
+  /*-----------------------------*/
+
+  if ((((u8) (GPIO_Mode)) & (u8) 0x80) != (u8) 0x00) { /* Output mode */
+    if ((((u8) (GPIO_Mode)) & (u8) 0x10) != (u8) 0x00) /* High level */
+      GPIOx->ODR |= (u8) GPIO_Pin;
+    else                      /* Low level */
+      GPIOx->ODR &= (u8) (~ (GPIO_Pin));
+
+    /* Set Output mode */
+    GPIOx->DDR |= (u8) GPIO_Pin;
+  } else {                      /* Input mode */
+    /* Set Input mode */
+    GPIOx->DDR &= (u8) (~ (GPIO_Pin));
+  }
+
+  /*------------------------------------------------------------------------*/
+  /* Pull-Up/Float (Input) or Push-Pull/Open-Drain (Output) modes selection */
+  /*------------------------------------------------------------------------*/
+
+  if ((((u8) (GPIO_Mode)) & (u8) 0x40) != (u8) 0x00) /* Pull-Up or Push-Pull */
+    GPIOx->CR1 |= (u8) GPIO_Pin;
+  else                          /* Float or Open-Drain */
+    GPIOx->CR1 &= (u8) (~ (GPIO_Pin));
+
+  /*-----------------------------------------------------*/
+  /* Interrupt (Input) or Slope (Output) modes selection */
+  /*-----------------------------------------------------*/
+
+  if ((((u8) (GPIO_Mode)) & (u8) 0x20) != (u8) 0x00) /* Interrupt or Slow slope */
+    GPIOx->CR2 |= (u8) GPIO_Pin;
+  else                          /* No external interrupt or No slope control */
+    GPIOx->CR2 &= (u8) (~ (GPIO_Pin));
+}
-- 
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