update Chapter07

Chapter07/error_handling/app/src/main.cpp

@@ -1,30 +0,0 @@
-#include <cstdint>
-#include <cstdio>
-
-#include <stm32f072xb.h>
-
-#include <hal.hpp>
-#include <uart_stm32.hpp>
-
-#include <retarget.hpp>
-
-
-int main()
-{
-    hal::init();
-
-    hal::uart_stm32 uart(USART2);
-    uart.init();
-
-    uart.write("Hi from main function!\r\n");
-
-    retarget::set_stdio_uart(&uart);
-
-    printf("Printing using printf\r\n");
-    
-    printf("PC: 0x%08lX\r\n", hal::get_pc());
-
-    while(true)
-    {
-    }
-}

Chapter07/error_handling/app/src/main_assert.cpp

@@ -0,0 +1,50 @@
+#include <cstdint>
+#include <cstdio>
+
+#include <stm32f072xb.h>
+
+#include <hal.hpp>
+#include <uart_stm32.hpp>
+
+#include <retarget.hpp>
+
+void log_pc_and_halt(std::uint32_t pc) {
+    printf("Assert at 0x%08lX\r\n", pc);
+    while(true) {}
+}
+
+#define light_assert(expr)         \
+        (static_cast<bool> (expr)  \
+        ? void (0)                 \
+        : log_pc_and_halt(hal::get_pc())    \
+        )
+
+enum class option : std::uint8_t {
+    Option1 = 0, 
+    Option2, 
+    Option3,
+    Last
+};
+    
+option uint8_to_option(uint8_t num) {
+    light_assert(num < static_cast<uint8_t>(option::Last));
+    return static_cast<option>(num);
+}
+
+int main()
+{
+    hal::init();
+
+    hal::uart_stm32 uart(USART2);
+    uart.init();
+
+    retarget::set_stdio_uart(&uart);
+
+    printf("Assert example\r\n");
+    
+    const option opt = uint8_to_option(3);
+
+    while(true)
+    {
+    }
+}

Chapter07/error_handling/app/src/main_exceptions.cpp

@@ -0,0 +1,48 @@
+#include <cstdint>
+#include <cstdio>
+
+#include <stm32f072xb.h>
+
+#include <hal.hpp>
+#include <uart_stm32.hpp>
+
+#include <retarget.hpp>
+
+void log_pc_and_halt(std::uint32_t pc) {
+    printf("Assert at 0x%08lX\r\n", pc);
+    while(true) {}
+}
+
+#define light_assert(expr)         \
+        (static_cast<bool> (expr)  \
+        ? void (0)                 \
+        : log_pc_and_halt(hal::get_pc())    \
+        )
+
+enum class option : std::uint8_t {
+    Option1 = 0, 
+    Option2, 
+    Option3,
+    Last
+};
+    
+option uint8_to_option(uint8_t num) {
+    light_assert(num < static_cast<uint8_t>(option::Last));
+    return static_cast<option>(num);
+}
+
+int main()
+{
+    hal::init();
+
+    hal::uart_stm32 uart(USART2);
+    uart.init();
+
+    retarget::set_stdio_uart(&uart);
+    
+    printf("Exceptions example\r\n");
+
+    while(true)
+    {
+    }
+}