From 6b8e2f5903994147f161a8113c87f2fed58f9fff Mon Sep 17 00:00:00 2001
From: dooku <mj370@protonmail.com>
Date: Wed, 9 Jun 2021 18:52:44 +0200
Subject: [PATCH] Fixed warning for implicit declaration of LL_mDelay

---
 fw/Core/Inc/sht4x.h | 3 +++
 fw/Core/Src/sht4x.c | 1 +
 2 files changed, 4 insertions(+)

diff --git a/fw/Core/Inc/sht4x.h b/fw/Core/Inc/sht4x.h
index 0e133f3..b21b67b 100644
--- a/fw/Core/Inc/sht4x.h
+++ b/fw/Core/Inc/sht4x.h
@@ -10,7 +10,9 @@
 
 #include "stdint.h"
 #include "stm32l0xx_ll_i2c.h"
+#include "stm32l0xx_ll_utils.h"
 #include "i2c.h"
+#include "crc8.h"
 
 /*
  * Defines & macros
@@ -24,6 +26,7 @@
 
 #define SHT4X_OK 0
 #define SHT4X_ERROR -1 // generic error
+#define SHT4X_CRC8_ERROR -2 // checksum failed
 
 /*
  * Data types
diff --git a/fw/Core/Src/sht4x.c b/fw/Core/Src/sht4x.c
index 50521da..59aced5 100644
--- a/fw/Core/Src/sht4x.c
+++ b/fw/Core/Src/sht4x.c
@@ -34,6 +34,7 @@ int sht4x_measure(int *temperature, int *relative_humidity)
 	if (result != I2C_OK) {
 		return SHT4X_ERROR;
 	}
+	// TODO checksum
 	// Convert to T and RH; taken directly from pseudocode in SHT4x datasheet, page 3
 	uint32_t t_ticks = (buffer[0] << 8) + buffer[1];
 	uint32_t rh_ticks = (buffer[3] << 8) + buffer[4];