zephyrSerial: start writing Serial wrapper

This wrapper basically now enables the use of Serial.print
and println functions and their most variants.

Signed-off-by: Dhruva Gole <[email protected]>

Author: DhruvaG2000

cores/arduino/CMakeLists.txt

@@ -4,6 +4,7 @@ zephyr_include_directories(../../variants)
 
 if(NOT DEFINED ARDUINO_BUILD_PATH)
 
+zephyr_sources(zephyrSerial.cpp)
 zephyr_sources(zephyrCommon.cpp)
 zephyr_sources(main.cpp)
 

cores/arduino/zephyrSerial.cpp

@@ -0,0 +1,28 @@
+#include <zephyrSerial.h>
+#include <Arduino.h>
+#include <zephyr/sys/printk.h>
+
+size_t arduino::ZephyrSerial::begin(unsigned long int baudrate){
+    return 0;
+}
+
+size_t arduino::ZephyrSerial::print(char ch){
+    printk("%c",ch);
+    return 0;
+}
+size_t arduino::ZephyrSerial::println(const char* ptr) {
+    printf("\n%s\n", ptr);
+    return 0;
+}
+size_t arduino::ZephyrSerial::println(char c){
+    // pvt_c = c;
+    printf("\n%c\n",c);
+    return 0;
+}
+
+size_t arduino::ZephyrSerial::println(void){
+    printf("\n");
+    return 0;
+}
+
+arduino::ZephyrSerial Serial;

cores/arduino/zephyrSerial.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <Arduino.h>
+#include <api/Print.h>
+
+namespace arduino {
+
+class ZephyrSerial {
+    char pvt_c;
+public:
+    size_t begin(unsigned long int baudrate);  //TODO
+
+    size_t print(const char c);
+
+    size_t println(const char c);
+    size_t println(const char* ptr);
+    size_t println(void);
+
+};
+
+}   // namespace arduino
+
+extern arduino::ZephyrSerial Serial;

samples/hello_arduino/src/app.cpp

@@ -3,9 +3,16 @@
  */
 
 #include <Arduino.h>
+#include "zephyrSerial.h"
 
-void setup() { printk("Hello World! %s\n", CONFIG_BOARD); }
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(115200); // dummy as of now, need to study and refer https://docs.zephyrproject.org/latest/hardware/peripherals/uart.html
+}
 void loop() {
-  printk("\nInside Loop...\n");
+  char c = 'D';
+  Serial.print(c);
+  Serial.println("Dhruva");
   delay(1000); // 1 second delay
 }