From 0ba716fb3e8cfd28ce991ee0c09fc0c84ed6877a Mon Sep 17 00:00:00 2001
From: Eggert Jung <eggert.s.jung@wischhof13.de>
Date: Tue, 24 May 2022 20:06:35 +0200
Subject: [PATCH] comments

---
 code/main.c | 43 ++++++++++++++++---------------------------
 1 file changed, 16 insertions(+), 27 deletions(-)

diff --git a/code/main.c b/code/main.c
index 3406c4b..53cadc8 100644
--- a/code/main.c
+++ b/code/main.c
@@ -7,12 +7,7 @@
 
 uint16_t holdingRegisters[4];
 
-void timer0100us_start(void) {
-	TCCR0B|=(1<<CS01); //prescaler 8
-	TIMSK0|=(1<<TOIE0);
-}
-
-//Return raw ADC data
+// return raw ADC data
 uint32_t HX711_get_data(uint8_t clk_PIN, uint8_t data_PIN, uint8_t gain_for_next_conv){
     uint32_t data = 0;
     for(uint8_t i = 0; i < 24; i++){    //Start 24bit transmission
@@ -63,29 +58,24 @@ uint32_t HX711_get_data(uint8_t clk_PIN, uint8_t data_PIN, uint8_t gain_for_next
 }
 
 void modbusGet(void) {
-	if (modbusGetBusState() & (1<<ReceiveCompleted))
-	{
-		switch(rxbuffer[1]) {
-			case fcReadHoldingRegisters:
-                PORTC ^= 1 << 1;
-//                _delay_ms(10);
-//                PORTC &= ~(1 << 1);
+    if (modbusGetBusState() & (1<<ReceiveCompleted))
+    {
+        switch(rxbuffer[1]) {
+            case fcReadHoldingRegisters:
+                PORTC ^= 1 << 1;      // toggle led
 
                 while(PINB & (1<<4)); // wait for data ready
 
                 uint32_t tmp = HX711_get_data(3, 4, 128); 
-                //int32_t tmp = -1000;
                 holdingRegisters[0] = tmp & 0xFFFF;
                 holdingRegisters[1] = (tmp>>16) & 0xFFFF;
-				modbusExchangeRegisters(holdingRegisters,0,4);
-			break;
-
-            default: {
-				modbusSendException(ecIllegalFunction);
-			}
-			break;
-		}
-	}
+                modbusExchangeRegisters(holdingRegisters,0,4);
+                break;
+            default:
+                modbusSendException(ecIllegalFunction);
+                break;
+        }
+    }
 }
 
 int main(void){
@@ -96,13 +86,12 @@ int main(void){
 	modbusInit();
     sei();
 
-    timer0100us_start();
+    /* modbus tick timer */
+	TCCR0B|=(1<<CS01);
+	TIMSK0|=(1<<TOIE0);
 
     while(1){
         modbusGet();
-        //PORTC ^= 1 << 0;
-        //_delay_ms(100);
-        //PORTC &= ~(1 << 1);
     }
 }