From 2bc65517dda275631462cbc42a07348ff641ffcb Mon Sep 17 00:00:00 2001
From: alanbjohnston <alan.b.johnston@gmail.com>
Date: Sat, 25 Jan 2020 20:43:43 -0500
Subject: [PATCH] Working with STM32 now with LED on PC13

---
 arduino/i2c_slave_with_sensor_reading.ino | 92 ++++++++++++++++++++---
 1 file changed, 82 insertions(+), 10 deletions(-)

diff --git a/arduino/i2c_slave_with_sensor_reading.ino b/arduino/i2c_slave_with_sensor_reading.ino
index c3e97ae1..a820baf3 100644
--- a/arduino/i2c_slave_with_sensor_reading.ino
+++ b/arduino/i2c_slave_with_sensor_reading.ino
@@ -1,73 +1,145 @@
-#include <Wire.h>
+#include <Wire_slave.h>
+
 #define REGISTER_0 0x00
+
 #define REGISTER_1 0x01
+
 #define REGISTER_2 0x02
+
 #define REGISTER_3 0x03
+
 #define I2C_ADDRESS_SELF 0x4B
 
+
+
 unsigned int reg_0_value = 41151;  
-unsigned int reg_1_value = 0;
-unsigned int reg_2_value = 0;
-unsigned int reg_3_value = 0;
+
+unsigned int reg_1_value = 1;
+
+unsigned int reg_2_value = 2;
+
+unsigned int reg_3_value = 3;
+
+
 
 uint8_t master_reg; // I2C master read register
+
 uint8_t slave_reg; // I2C slave read register
 
+
+
 void setup()
+
 {
+
   Serial.begin(9600); //Begins Serial communication
+
   Serial.println("Setup for sensor");
 
+
+
   Wire.begin(I2C_ADDRESS_SELF);        // join i2c bus
-  Wire.setClock(400000); // set I2C clock for full speed
+
+//  Wire.setClock(400000); // set I2C clock for full speed
+
   Serial.begin(9600);  // start serial for output
-  digitalWrite(A4, LOW); 
-  digitalWrite(A5, LOW);
+
+//  digitalWrite(A4, LOW); 
+
+//  digitalWrite(A5, LOW);
+
   Wire.onRequest(requestEvent);
+
   Wire.onReceive(receiveEvent);
-  pinMode(LED_BUILTIN, OUTPUT);
+
+  pinMode(PC13, OUTPUT);
+
   Serial.println("Starting");
+
 }
 
+
+
 void loop()
+
 {
+
   delay(1000);
+
   
+
   Serial.println("Read sensor value");
+
   
+
   reg_0_value = 1;  // set register 0 value to the sensor value
+
   reg_1_value += 1;  // increment a count of how many values read
+
 }
 
+
+
 void receiveEvent(int bytes) {
+
   // Slave reads the first byte to determine which register is concerned
+
   slave_reg = Wire.read();
+
     Serial.print("Slave read register ");
+
     Serial.println(slave_reg);
+
 }
 
+
+
 void requestEvent() {
+
   // Slave uses the the register variable to know what to send back
-  digitalWrite(LED_BUILTIN, HIGH);
+
+  digitalWrite(PC13, HIGH);
+
   if (slave_reg == REGISTER_0) {
+
     Wire.write((uint8_t *)&reg_0_value, sizeof(reg_0_value));
+
     Serial.print("Slave writing value ");
+
     Serial.println(reg_0_value);
+
   } else if (slave_reg == REGISTER_1) {
+
     Wire.write((uint8_t *)&reg_1_value, sizeof(reg_1_value));
+
     Serial.print("Slave writing value ");
+
     Serial.println(reg_1_value);
+
   } else if (slave_reg == REGISTER_2) {
+
     Wire.write((uint8_t *)&reg_2_value, sizeof(reg_2_value));
+
     Serial.print("Slave writing value ");
+
     Serial.println(reg_2_value);
+
   } else if (slave_reg == REGISTER_3) {
+
     Wire.write((uint8_t *)&reg_3_value, sizeof(reg_3_value));
+
     Serial.print("Slave writing value ");
+
     Serial.println(reg_3_value);
+
   } else {
+
     Serial.println("Slave unknown register");
+
   }
+
   delay(50);
-  digitalWrite(LED_BUILTIN, LOW);
+
+  digitalWrite(PC13, LOW);
+
 }