From e4ed4d005dd91583312e22d4a4227df79acb1045 Mon Sep 17 00:00:00 2001
From: Pim van Pelt <pim@ipng.nl>
Date: Mon, 2 Apr 2018 21:50:30 +0200
Subject: [PATCH] Loop once per 5 seconds.

Clean up CRC8 functions (style, no caps).
---
 src/main.c        |  2 +-
 src/mgos_sht31.c  | 10 +++++-----
 src/mgos_si7021.c | 10 +++++-----
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/src/main.c b/src/main.c
index e9570e6..bfc3e32 100644
--- a/src/main.c
+++ b/src/main.c
@@ -90,7 +90,7 @@ int main() {
   for (;;) {
     do_sht31(sht31);
     do_si7021(si7021);
-    sleep(1);
+    sleep(5);
   }
 
   mgos_sht31_destroy(&sht31);
diff --git a/src/mgos_sht31.c b/src/mgos_sht31.c
index 83be65b..729676f 100644
--- a/src/mgos_sht31.c
+++ b/src/mgos_sht31.c
@@ -38,13 +38,13 @@ static bool mgos_sht31_cmd(struct mgos_sht31 *sensor, uint16_t cmd) {
 
 static uint8_t crc8(const uint8_t *data, int len)
 {
-  const uint8_t POLYNOMIAL=0x31;
+  const uint8_t poly=0x31;
   uint8_t crc=0xFF;
 
-  for (int j=len; j; --j ) {
-    crc ^= *data++;
-    for ( int i = 8; i; --i )
-      crc = ( crc & 0x80 ) ? (crc << 1) ^ POLYNOMIAL : (crc << 1);
+  for (int j=len; j; --j) {
+    crc^=*data++;
+    for (int i=8; i; --i)
+      crc=(crc & 0x80) ? (crc << 1) ^ poly : (crc << 1);
   }
   return crc;
 }
diff --git a/src/mgos_si7021.c b/src/mgos_si7021.c
index 1781fa1..0a8c2a4 100644
--- a/src/mgos_si7021.c
+++ b/src/mgos_si7021.c
@@ -34,13 +34,13 @@ static bool mgos_si7021_cmd(struct mgos_si7021 *sensor, uint8_t cmd) {
 
 static uint8_t crc8(const uint8_t *data, int len)
 {
-  const uint8_t POLYNOMIAL=0x31;
+  const uint8_t poly=0x31;
   uint8_t crc=0x00;
 
-  for (int j=len; j; --j ) {
-    crc ^= *data++;
-    for ( int i = 8; i; --i )
-      crc = ( crc & 0x80 ) ? (crc << 1) ^ POLYNOMIAL : (crc << 1);
+  for (int j=len; j; --j) {
+    crc^=*data++;
+    for (int i=8; i; --i)
+      crc=(crc & 0x80) ? (crc << 1) ^ poly : (crc << 1);
   }
   return crc;
 }