Squash me

Use #pragma once instead of guard definitions in every header

.clang-format

@@ -14,6 +14,10 @@ FixNamespaceComments: false
 PackConstructorInitializers: Never
 AlignAfterOpenBracket: AlwaysBreak
 InsertBraces: true
+SpaceBeforeParens: Custom
+SpaceBeforeParensOptions:
+  AfterControlStatements: true
+  AfterFunctionDefinitionName: false
 BraceWrapping:
   AfterClass: true # false
   AfterControlStatement: false

CMakeLists.txt

@@ -5,6 +5,7 @@ add_library(f4ll STATIC
     src/fault.cpp
     src/memcpy_dma.cpp
     src/packet_usart.cpp
+    src/ringbuffer.cpp
     src/str_util.cpp
     src/usart_core.cpp
 )

inc/f4ll/console_handler.h

@@ -5,23 +5,34 @@
  *      Author: abody
  */
 
-#ifndef LL_CONSOLEHANDLER_H_
-#define LL_CONSOLEHANDLER_H_
+#pragma once
 
+#include <f4ll/initialized_singleton.h>
 #include <f4ll/packet_usart.h>
-#include <f4ll/singleton.h>
+#include <f4ll/ringbuffer.h>
 
 namespace f4ll {
 
-class console_handler : public usart_core, public singleton<console_handler>
+class console_handler : public usart_core, public initialized_singleton<console_handler>
 {
-    friend class singleton<console_handler>;
+    friend class initialized_singleton<console_handler>;
 
 public:
-    void PrintStats(uint8_t id, packet_usart &usart);
+    using size_type = iringbuffer::size_type;
+    class iconsole_input
+    {
+    public:
+        virtual void input_available(size_type len) = 0;
+    };
+
+    void print(char const *s);
+    void flush();
+    size_t append(char const *s);
 
 private:
-    console_handler(USART_TypeDef *usart, DMA_TypeDef *dma, uint32_t stream_rx, uint32_t stream_tx);
+    console_handler(
+        USART_TypeDef *usart, DMA_TypeDef *dma, uint32_t stream_rx, uint32_t stream_tx, uint8_t *rx_buffer, size_type x_buffer_size,
+        uint8_t *tx_buffer, size_type tx_buffer_size, iconsole_input *rx_callback);
 
     // LL_UsartCore pure virtual function implementations
     virtual void receiver_idle(void) override;
@@ -35,10 +46,12 @@ private:
     virtual void tx_dma_half_transfer(void) override;
     virtual void tx_dma_error(dma_helper::dma_error_type reason) override;
 
-    char m_buffer[128];
-    uint16_t m_used = 0;
+    ringbuffer_ext m_tx_buffer;
+    size_type m_bytes_sent = 0;
+
+    ringbuffer_ext m_rx_buffer;
+    size_type m_bytes_requested = 0;
+    iconsole_input *m_rx_callback;
 };
 
 } /* namespace f4ll */
-
-#endif /* LL_CONSOLEHANDLER_H_ */

inc/f4ll/crc_handler.h

@@ -7,15 +7,15 @@
 #pragma once
 
 #include <f4ll/dma_helper.h>
-#include <f4ll/singleton.h>
+#include <f4ll/initialized_singleton.h>
 #include <inttypes.h>
 #include <platform/dma_ll.h>
 
 namespace f4ll {
 
-class crc_handler : public singleton<crc_handler>
+class crc_handler : public initialized_singleton<crc_handler>
 {
-    friend class singleton<crc_handler>;
+    friend class initialized_singleton<crc_handler>;
 
 public:
     struct icallback

inc/f4ll/dma_helper.h

@@ -5,8 +5,7 @@
  *      Author: abody
  */
 
-#ifndef LL_DMAHELPER_H_
-#define LL_DMAHELPER_H_
+#pragma once
 
 #include <inttypes.h>
 #include <platform/dma_ll.h>
@@ -56,5 +55,3 @@ private:
 };
 
 } /* namespace f4ll */
-
-#endif /* LL_DMAHELPER_H_ */

inc/f4ll/fault.h

@@ -1,10 +1,9 @@
-#ifndef __FAULT_H
-#define __FAULT_H
+#pragma once
 
-#define FAULT_REASON_HARD_FAULT       1
-#define FAULT_REASON_MEMMANAGE_FAULT  2
-#define FAULT_REASON_BUS_FAULT        3
-#define FAULT_REASON_USAGE_FAULT      4
+#define FAULT_REASON_HARD_FAULT 1
+#define FAULT_REASON_MEMMANAGE_FAULT 2
+#define FAULT_REASON_BUS_FAULT 3
+#define FAULT_REASON_USAGE_FAULT 4
 
 #ifdef __cplusplus
 extern "C" {
@@ -43,5 +42,3 @@ __attribute__((noreturn)) void fault_handler(uint32_t type, fault_context_t *con
 #ifdef __cplusplus
 }
 #endif
-
-#endif  /* __FAULT_H */

inc/f4ll/initialized_singleton.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <utility>
+
+namespace f4ll {
+
+template <typename T> class initialized_singleton
+{
+public:
+    static T &instance() { return *m_instance; }
+    template <typename... args_t> static T &init(args_t &&...args)
+    {
+        static T instance{std::forward<args_t>(args)...};
+        m_instance = &instance;
+        return instance;
+    }
+
+protected:
+    initialized_singleton() = default;
+    initialized_singleton(const initialized_singleton &) = delete;
+    initialized_singleton &operator=(const initialized_singleton &) = delete;
+    static T *m_instance;
+};
+
+template <typename T> T *initialized_singleton<T>::m_instance = nullptr;
+
+} //  namespace f1ll {

inc/f4ll/irq_lock.h

@@ -1,5 +1,4 @@
-#ifndef _IRQLOCK_H_INCLUDED
-#define _IRQLOCK_H_INCLUDED
+#pragma once
 
 #include <inttypes.h>
 #include <stm32f4xx.h>
@@ -19,8 +18,6 @@ public:
     inline ~irq_lock() { __set_PRIMASK(m_primask); }
 
 private:
-	uint32_t m_primask;
+    uint32_t m_primask;
 };
 }
-
-#endif	//	_IRQLOCK_H_INCLUDED

inc/f4ll/memcpy_dma.h

@@ -7,13 +7,13 @@
 #pragma once
 
 #include <f4ll/dma_helper.h>
-#include <f4ll/singleton.h>
+#include <f4ll/initialized_singleton.h>
 
 namespace f4ll {
 
-class memcpy_dma : public singleton<memcpy_dma>, private dma_helper
+class memcpy_dma : public initialized_singleton<memcpy_dma>, private dma_helper
 {
-    friend class singleton<memcpy_dma>;
+    friend class initialized_singleton<memcpy_dma>;
 
 public:
     void *copy(void *dst, void const *src, uint16_t length);
@@ -24,4 +24,4 @@ private:
     bool volatile m_busy = false;
 };
 
-} /* namespace f4ll */
+} // namespace f4ll

inc/f4ll/packet_usart.h

@@ -5,11 +5,12 @@
  *      Author: abody
  */
 
-#ifndef LL_HSUSART_H_
-#define LL_HSUSART_H_
+#pragma once
+
+#include <platform/usart_ll.h>
+
 #include <f4ll/crc_handler.h>
 #include <f4ll/usart_core.h>
-#include <platform/usart_ll.h>
 
 namespace f4ll {
 
@@ -119,4 +120,3 @@ private:
 };
 
 }
-#endif /* LL_HSUSART_H_ */

inc/f4ll/ringbuffer.h

@@ -0,0 +1,134 @@
+/*
+ * ringbuffer.h
+ *
+ *  Created on: May 31, 2025
+ *      Author: Attila Body
+ */
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+
+namespace f4ll {
+
+class iringbuffer
+{
+public:
+    using size_type = size_t;
+
+    /// @brief Copies data to the ring buffer (without committing it)
+    /// @param data Pointer to the data to copy
+    /// @param len Length of the data to copy
+    /// @retval Length of the data copied (differs when not all data can fit)
+    virtual size_type put(uint8_t const *data, size_type len) = 0;
+
+    /// @brief Commits the data already placed into the buffer and notifies the
+    /// consumer about it's availability
+    virtual void commit() = 0;
+
+    /// @brief Waits until all the data from the ring buffer gets consumed.
+    // void flush();
+
+    /// @brief Gets a pointer to the next chunk of committed data in the buffer
+    /// without registering the consumption.
+    ///        The caller should also call report_consumption using the returned
+    ///        chunk length after it finished processing the data.
+    /// @param[out] data Receives a pointer to the first byte of the available
+    /// data in the buffer
+    /// @param[out] len Receives the length of the chunk available in the buffer.
+    /// Will not exceed len_requested.
+    /// @retval true if the buffer has more available data, false otherwise.
+    virtual bool get_chunk(uint8_t const *&data, size_type &len) const = 0;
+
+    /// @brief Marks the chunk returned by ringbuffer_GetChunk as available.
+    /// @param consumed The length of the chunk as returned by
+    /// ringbuffer_GetChunk(..., len)
+    virtual void consumed(size_type len) = 0;
+
+    /// @brief Gets a pointer to the next free chunk in the buffer
+    /// @retval Pointer to the beginning of the next free buffer chmemory area
+    /// @param[out] len Receives the length of the returned buffer area.
+    virtual uint8_t *get_free_chunk(size_type &len) = 0;
+
+    /// @brief Registers the data written in the free buffer chunk.
+    ///        IMPORTANT: Do not call put() after start modifying the buffer
+    ///        returned by get_free_chunk() before registering the written data by
+    ///        calling supplied()
+    /// @param len The length of the data written in the buffer
+    virtual bool produced(size_type len) = 0;
+
+    /// @brief Returns the number of uncommited bytes in the ring buffer.
+    virtual size_type uncommited() const = 0;
+
+    /// @brief Returns the number of commited bytes in the ring buffer.
+    virtual size_type commited() const = 0;
+
+    /// @brief Discards the uncommited data in the ring buffer.
+    virtual void discard() = 0;
+
+    /// @brief Returns the size of the internal buffer.
+    ///        One byte in the buffer is always reserved as separator
+    virtual size_type size() const = 0;
+
+    /// @brief Returns the size of the used place in the buffer
+    //        (including non-commited data)
+    virtual size_type used() const = 0;
+
+    /// @brief Returns the free storage capacity of the buffer
+    virtual size_type unused() const = 0;
+};
+
+//
+class ringbuffer_ext : public iringbuffer
+{
+public:
+    ringbuffer_ext(uint8_t *bptr, size_type bsize);
+
+    size_type put(uint8_t const *data, size_type len) override;
+    void commit() override;
+
+    bool get_chunk(uint8_t const *&data, size_type &len) const override;
+    void consumed(size_type len) override;
+
+    uint8_t *get_free_chunk(size_type &len) override;
+    bool produced(size_type len) override;
+
+    size_type uncommited() const override;
+    size_type commited() const override;
+    void discard() override;
+    size_type size() const override;
+    size_type used() const override;
+    size_type unused() const override;
+
+private:
+    uint8_t *m_buffer;           //!< Data bufer
+    size_type const m_bsize;     //!< Data buffer size
+    size_type m_head = 0;        //!< Write position
+    size_type m_head_shadow = 0; //!< Shadowed write position for collecting data
+                                 //!< before committing it
+    size_type m_tail = 0;        //!< Read position
+
+    size_type marker_diff(size_type m1, size_type m2) const;
+    size_type max_chunk_len() const;
+};
+
+//
+template <iringbuffer::size_type SZ> class ringbuffer : public ringbuffer_ext
+{
+public:
+    ringbuffer();
+
+private:
+    uint8_t m_buffer[SZ];
+};
+
+//
+template <iringbuffer::size_type SZ>
+ringbuffer<SZ>::ringbuffer()
+    : ringbuffer_ext(m_buffer, SZ)
+{
+}
+
+} // namespace f1ll

inc/f4ll/singleton.h

@@ -1,33 +0,0 @@
-#ifndef SINGLETON_H_
-#define SINGLETON_H_
-
-#include <utility>
-
-namespace f4ll {
-
-template <typename T> class singleton
-{
-public:
-    static T &instance()
-    {
-        return *m_instance;
-    }
-    template <typename... args_t> static T &init(args_t &&...args)
-    {
-        static T instance{std::forward<args_t>(args)...};
-        m_instance = &instance;
-        return instance;
-    }
-
-protected:
-    singleton() = default;
-    singleton(const singleton &) = delete;
-    singleton &operator=(const singleton &) = delete;
-    static T *m_instance;
-};
-
-template <typename T> T *singleton<T>::m_instance = nullptr;
-
-} //  namespace f1ll {
-
-#endif /* SINGLETON_H_ */

inc/f4ll/str_util.h

@@ -5,8 +5,7 @@
  *      Author: compi
  */
 
-#ifndef _STM32PLUS_STRUTIL_H_
-#define _STM32PLUS_STRUTIL_H_
+#pragma once
 
 #include <stddef.h>
 #include <inttypes.h>
@@ -27,5 +26,3 @@ char tochr(const uint8_t in, const uint8_t upper);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* _STM32PLUS_STRUTIL_H_ */

inc/f4ll/usart_core.h

@@ -5,8 +5,8 @@
  *      Author: abody
  */
 
-#ifndef LL_USARTCORE_H_
-#define LL_USARTCORE_H_
+#pragma once
+
 #include <platform/usart_ll.h>
 
 #include <f4ll/dma_helper.h>
@@ -31,6 +31,7 @@ protected:
     dma_helper m_tx_dma;
 
 private:
+    // these functions are called from interrup context!
     virtual void receiver_idle(void) = 0;
     virtual void transmission_complete(void) = 0;
     virtual void framing_error(void) = 0;
@@ -44,11 +45,10 @@ private:
     virtual void tx_dma_half_transfer(void) = 0;
     virtual void tx_dma_error(dma_helper::dma_error_type reason) = 0;
 
+public:
     void usart_isr();
     void rx_dma_isr();
     void tx_dma_isr();
 };
 
 } /* namespace f4ll */
-
-#endif /* LL_USARTCORE_H_ */

src/console_handler.cpp

@@ -5,19 +5,50 @@
  *      Author: abody
  */
 
+#include <cstddef>
 #include <f4ll/console_handler.h>
+#include <f4ll/irq_lock.h>
 #include <f4ll/str_util.h>
 
+#include <cstring>
+
 namespace f4ll {
 
-console_handler::console_handler(USART_TypeDef *usart, DMA_TypeDef *dma, uint32_t stream_rx, uint32_t stream_tx)
-    : usart_core(usart, dma, stream_rx, stream_tx)
+console_handler::console_handler(
+    USART_TypeDef *usart, DMA_TypeDef *dma, uint32_t stream_rx, uint32_t stream_tx, uint8_t *rx_buffer, size_type rx_buffer_size,
+    uint8_t *tx_buffer, size_type tx_buffer_size, iconsole_input *rx_callback)
+    : usart_core(usart, dma, stream_rx, stream_tx),
+      m_tx_buffer(tx_buffer, tx_buffer_size),
+      m_rx_buffer(rx_buffer, rx_buffer_size),
+      m_rx_callback(rx_callback)
 {
 }
 
-void console_handler::receiver_idle(void) {}
+void console_handler::receiver_idle(void)
+{
+    if (!m_rx_callback) {
+        return;
+    }
+    uint16_t rcvd_bytes = m_bytes_requested - LL_DMA_GetDataLength(m_rx_dma.get_dma(), m_rx_dma.get_stream());
+    size_type len;
+    uint8_t const *data;
+    bool more_data = m_rx_buffer.get_chunk(data, len);
+    m_rx_callback->input_available(len);
+}
 
-void console_handler::transmission_complete(void) {}
+void console_handler::transmission_complete(void)
+{
+    m_tx_buffer.consumed(m_bytes_sent);
+    if (m_tx_buffer.commited()) {
+        uint8_t const *chunk;
+        m_tx_buffer.get_chunk(chunk, m_bytes_sent);
+        if (m_bytes_sent) {
+            setup_transmit(chunk, m_bytes_sent);
+        }
+    } else {
+        m_bytes_sent = 0;
+    }
+}
 
 void console_handler::framing_error(void) {}
 
@@ -45,35 +76,37 @@ void console_handler::tx_dma_error(dma_helper::dma_error_type reason)
     (void)reason;
 }
 
-#define ADDINFO(b, s, u)                                                                                                                   \
-    b += strcpy_ex(b, s);                                                                                                                  \
-    b += uitodec(b, u);
-
-void console_handler::PrintStats(uint8_t id, packet_usart &usart)
+size_t console_handler::append(char const *s)
 {
-    char ids[] = " : ";
-    char *buffer = m_buffer;
-    packet_usart::stats const &stats(usart.get_stats());
+    size_t len = strlen(s);
+    if (!len) {
+        return 0;
+    }
+    return len - m_tx_buffer.put(reinterpret_cast<uint8_t const *>(s), len);
+}
 
-    ids[0] = id + '0';
-    buffer += strcpy_ex(buffer, ids);
-    ADDINFO(buffer, " s: ", stats.sent);
-    ADDINFO(buffer, " r: ", stats.rcvd);
-    ADDINFO(buffer, " sk: ", stats.skiped);
-    ADDINFO(buffer, " or: ", stats.overrun);
-    ADDINFO(buffer, " he: ", stats.hdr_error);
-    ADDINFO(buffer, " pe: ", stats.payload_errror);
-    buffer += strcpy_ex(buffer, ",0x");
-    buffer += uitohex(buffer, stats.pep1, 8);
-    buffer += strcpy_ex(buffer, ",0x");
-    buffer += uitohex(buffer, stats.pep2, 8);
-    ADDINFO(buffer, " rde: ", stats.rx_dma_error);
-    ADDINFO(buffer, " tde: ", stats.tx_dma_error);
-    ADDINFO(buffer, " pmh: ", stats.premature_hdr);
-    ADDINFO(buffer, " pmp: ", stats.premature_payload);
-    buffer += strcpy_ex(buffer, "\r\n");
+void console_handler::flush()
+{
+    if (!m_tx_buffer.uncommited()) {
+        return;
+    }
+    m_tx_buffer.commit();
 
-    setup_transmit(m_buffer, buffer - m_buffer + 1);
+    if (m_bytes_sent) {
+        return;
+    }
+
+    uint8_t const *chunk;
+    m_tx_buffer.get_chunk(chunk, m_bytes_sent);
+    if (m_bytes_sent) {
+        setup_transmit(chunk, m_bytes_sent);
+    }
+}
+
+void console_handler::print(char const *s)
+{
+    append(s);
+    flush();
 }
 
 } /* namespace f4ll */

src/crc_handler.cpp

@@ -4,6 +4,7 @@
  *  Created on: Oct 26, 2019
  *      Author: compi
  */
+
 #include <f4ll/crc_handler.h>
 
 namespace f4ll {

src/fault.cpp

@@ -6,7 +6,7 @@
  *      -c "tpiu config internal <logfile_full_path> uart off <cpufreq>"
  */
 #include <inttypes.h>
-//#include <core_cm4.h>
+// #include <core_cm4.h>
 #include <f4ll/fault.h>
 #include <f4ll/str_util.h>
 #include <stm32f4xx.h>
@@ -24,39 +24,40 @@ void __attribute__((weak)) app_fault_callback(uint32_t reason)
 
 void swo_send_str(char const *str, uint8_t len, uint8_t port)
 {
-	while(len) {
-		if (((ITM->TCR & ITM_TCR_ITMENA_Msk) != 0UL) &&      // ITM enabled
-		    ((ITM->TER & (1UL << port)     ) != 0UL)   )     // ITM Port enabled
-		{
-			// Wait until shift register is free
-			while (ITM->PORT[port].u32 == 0UL) {
-				__ASM volatile ("nop");
-			}
-			if(len >= 4) {
-				ITM->PORT[port].u32 = *(uint32_t*)(str);
-				str += 4;
-				len -= 4;
-			} else if(len >= 2) {
-				ITM->PORT[port].u16 = *(uint16_t*)(str);
-				str += 2;
-				len -= 2;
-			} else {
-				ITM->PORT[port].u8 = *(uint8_t*)(str);
-				++str;
-				--len;
-			}
-		} else
-			break;
-	}
+    while (len) {
+        if (((ITM->TCR & ITM_TCR_ITMENA_Msk) != 0UL) && // ITM enabled
+            ((ITM->TER & (1UL << port)) != 0UL))        // ITM Port enabled
+        {
+            // Wait until shift register is free
+            while (ITM->PORT[port].u32 == 0UL) {
+                __ASM volatile("nop");
+            }
+            if (len >= 4) {
+                ITM->PORT[port].u32 = *(uint32_t *)(str);
+                str += 4;
+                len -= 4;
+            } else if (len >= 2) {
+                ITM->PORT[port].u16 = *(uint16_t *)(str);
+                str += 2;
+                len -= 2;
+            } else {
+                ITM->PORT[port].u8 = *(uint8_t *)(str);
+                ++str;
+                --len;
+            }
+        } else {
+            break;
+        }
+    }
 }
 
 void fault_print_str(char const *fmtstr, uint32_t *values)
 {
-	char hex_str[9]={0};
+    char hex_str[9] = {0};
     char const *next_chunk = fmtstr;
 
-    while(*fmtstr) {
-		if(*fmtstr == '%') {
+    while (*fmtstr) {
+        if (*fmtstr == '%') {
             swo_send_str(next_chunk, fmtstr - next_chunk, 0);
             uitohex(hex_str, *values++, 8);
             swo_send_str(hex_str, 8, 0);
@@ -71,80 +72,71 @@ void fault_print_str(char const *fmtstr, uint32_t *values)
 
 void fault_handler(uint32_t type, fault_context_t *context)
 {
-	uint32_t FSR[9] = {
-		SCB->HFSR,
-		0xff & SCB->CFSR,
-		(0xff00 & SCB->CFSR) >> 8,
-		(0xffff0000 & SCB->CFSR) >> 16,
-		SCB->DFSR,
-		SCB->AFSR,
-		SCB->SHCSR,
-		SCB->MMFAR,
-		SCB->BFAR
-	};
+    uint32_t FSR[9] = {
+        SCB->HFSR,  0xff & SCB->CFSR, (0xff00 & SCB->CFSR) >> 8, (0xffff0000 & SCB->CFSR) >> 16, SCB->DFSR, SCB->AFSR, SCB->SHCSR,
+        SCB->MMFAR, SCB->BFAR};
 
-	while(1) {
-		fault_print_str("\n++ Fault Handler ++\n\nFaultType: ",NULL);
-		switch( type ) {
-		case FAULT_REASON_HARD_FAULT:
-			fault_print_str("HardFault",NULL);
-			break;
-		case FAULT_REASON_MEMMANAGE_FAULT:
-			fault_print_str("MemManageFault",NULL);
-			break;
-		case FAULT_REASON_BUS_FAULT:
-			fault_print_str("BusFault",NULL);
-			break;
-		case FAULT_REASON_USAGE_FAULT:
-			fault_print_str("UsageFault",NULL);
-			break;
-		default:
-			fault_print_str("Unknown Fault",NULL);
-			break;
-		}
+    while (1) {
+        fault_print_str("\n++ Fault Handler ++\n\nFaultType: ", NULL);
+        switch (type) {
+            case FAULT_REASON_HARD_FAULT:
+                fault_print_str("HardFault", NULL);
+                break;
+            case FAULT_REASON_MEMMANAGE_FAULT:
+                fault_print_str("MemManageFault", NULL);
+                break;
+            case FAULT_REASON_BUS_FAULT:
+                fault_print_str("BusFault", NULL);
+                break;
+            case FAULT_REASON_USAGE_FAULT:
+                fault_print_str("UsageFault", NULL);
+                break;
+            default:
+                fault_print_str("Unknown Fault", NULL);
+                break;
+        }
 
-		fault_print_str("\n\nContext:",NULL);
+        fault_print_str("\n\nContext:", NULL);
 
-		fault_print_str(
-			"\nR0   : %"
-			"\nR1   : %"
-			"\nR2   : %"
-			"\nR3   : %"
-			"\nR4   : %"
-			"\nR5   : %"
-			"\nR6   : %"
-			"\nR7   : %"
-			"\nR8   : %"
-			"\nR9   : %"
-			"\nR10  : %"
-			"\nR11  : %"
-			"\nR12  : %"
-			"\nSP   : %"
-			"\nLR   : %"
-			"\nPC   : %"
-			"\nxPSR : %"
-			"\nPSP  : %"
-			"\nMSP  : %",
-			(uint32_t *)context);
+        fault_print_str(
+            "\nR0   : %"
+            "\nR1   : %"
+            "\nR2   : %"
+            "\nR3   : %"
+            "\nR4   : %"
+            "\nR5   : %"
+            "\nR6   : %"
+            "\nR7   : %"
+            "\nR8   : %"
+            "\nR9   : %"
+            "\nR10  : %"
+            "\nR11  : %"
+            "\nR12  : %"
+            "\nSP   : %"
+            "\nLR   : %"
+            "\nPC   : %"
+            "\nxPSR : %"
+            "\nPSP  : %"
+            "\nMSP  : %",
+            (uint32_t *)context);
 
-		//Capture CPUID to get core/cpu info
-		fault_print_str("\nCPUID: %",(uint32_t *)&SCB->CPUID);
+        // Capture CPUID to get core/cpu info
+        fault_print_str("\nCPUID: %", (uint32_t *)&SCB->CPUID);
 
-		fault_print_str(
-			"\nHFSR : %"
-			"\nMMFSR: %"
-			"\nBFSR : %"
-			"\nUFSR : %"
-			"\nDFSR : %"
-			"\nAFSR : %"
-			"\nSHCSR: %",
-			FSR);
+        fault_print_str(
+            "\nHFSR : %"
+            "\nMMFSR: %"
+            "\nBFSR : %"
+            "\nUFSR : %"
+            "\nDFSR : %"
+            "\nAFSR : %"
+            "\nSHCSR: %",
+            FSR);
 
-		app_fault_callback(type);
-	}
+        app_fault_callback(type);
+    }
 }
 
 #ifdef __cplusplus
 }
 #endif
-

src/packet_usart.cpp

@@ -5,7 +5,8 @@
  *      Author: abody
  */
 #include <f4ll/packet_usart.h>
-#include <string.h>
+
+#include <cstring>
 
 namespace f4ll {
 

src/ringbuffer.cpp

@@ -0,0 +1,150 @@
+#include <f4ll/ringbuffer.h>
+
+namespace f4ll {
+
+ringbuffer_ext::ringbuffer_ext(uint8_t *bptr, size_type bsize)
+    : m_buffer(bptr),
+      m_bsize(bsize)
+{
+}
+
+iringbuffer::size_type ringbuffer_ext::put(uint8_t const *data, size_type len)
+{
+    size_type chunk1 = 0;
+    size_type chunk2 = 0;
+
+    if (!data || !len) {
+        return 0;
+    }
+
+    size_type max_len = unused();
+    len = len < max_len ? len : max_len;
+
+    chunk1 = m_bsize - m_head_shadow;
+    if (chunk1 >= len) {
+        chunk1 = len;
+    } else {
+        chunk2 = len - chunk1;
+    }
+
+    std::memcpy(m_buffer + m_head_shadow, data, chunk1);
+    m_head_shadow += chunk1;
+    if (m_head_shadow == m_bsize) {
+        m_head_shadow = 0;
+    }
+
+    if (chunk2) {
+        std::memcpy(m_buffer, data + chunk1, chunk2);
+        m_head_shadow += chunk2;
+        if (m_head_shadow == m_bsize) {
+            m_head_shadow = 0;
+        }
+    }
+
+    return len;
+}
+
+void ringbuffer_ext::commit()
+{
+    m_head = m_head_shadow;
+}
+
+bool ringbuffer_ext::get_chunk(uint8_t const *&data, size_type &len) const
+{
+    size_type head = m_head;
+    size_type tail = m_tail;
+    size_type chunk_size = head >= tail ? head - tail : m_bsize - tail;
+
+    if (!chunk_size) {
+        len = 0;
+        return tail != head;
+    }
+
+    data = m_buffer + tail;
+    len = chunk_size;
+
+    tail += chunk_size;
+    if (tail == m_bsize) {
+        tail = 0;
+    }
+
+    return tail != head;
+}
+
+void ringbuffer_ext::consumed(size_type len)
+{
+    if (!len) {
+        return;
+    }
+    m_tail += len;
+    if (m_tail == m_bsize) {
+        m_tail = 0;
+    }
+}
+
+iringbuffer::size_type ringbuffer_ext::max_chunk_len() const
+{
+    if (m_tail <= m_head_shadow) {
+        return m_bsize - m_head_shadow;
+    } else {
+        return m_tail - m_head_shadow - 1;
+    }
+}
+
+uint8_t *ringbuffer_ext::get_free_chunk(size_type &len)
+{
+    len = max_chunk_len();
+
+    return m_buffer + m_head_shadow;
+}
+
+bool ringbuffer_ext::produced(size_type len)
+{
+    size_type max_len = max_chunk_len();
+    if (len > max_len) {
+        return false;
+    }
+    m_head_shadow += len;
+    if (m_head_shadow == m_bsize) {
+        m_head_shadow = 0;
+    }
+    return true;
+}
+
+iringbuffer::size_type ringbuffer_ext::uncommited() const
+{
+    return marker_diff(m_head_shadow, m_head);
+}
+
+iringbuffer::size_type ringbuffer_ext::commited() const
+{
+    return marker_diff(m_head, m_tail);
+}
+
+void ringbuffer_ext::discard()
+{
+    m_head_shadow = m_head;
+}
+
+iringbuffer::size_type ringbuffer_ext::size() const
+{
+    return m_bsize;
+}
+
+iringbuffer::size_type ringbuffer_ext::used() const
+{
+    return marker_diff(m_head_shadow, m_tail);
+}
+
+iringbuffer::size_type ringbuffer_ext::unused() const
+{
+    return m_bsize - used() - 1;
+}
+
+iringbuffer::size_type ringbuffer_ext::marker_diff(size_type m1, size_type m2) const
+{
+    return (m1 >= m2) ? (m1 - m2) : (m_bsize - m2 + m1);
+}
+
+//
+}

src/str_util.cpp

@@ -1,5 +1,6 @@
 #include <f4ll/str_util.h>
-#include <stdint.h>
+
+#include <cstdint>
 
 //////////////////////////////////////////////////////////////////////////////
 size_t strcpy_ex(char *dst, char const *src)