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169 lines
3.2 KiB
169 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Digital Voice Modem - Hotspot Firmware
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright (c) 2020 Jonathan Naylor, G4KLX
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* Copyright (c) 2020 Geoffrey Merck, F4FXL - KC3FRA
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*
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*/
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/**
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* @file STM_UART.h
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* @ingroup hotspot_fw
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* @file STM_UART.cpp
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* @ingroup hotspot_fw
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*/
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#if defined(STM32F10X_MD) || defined(STM32F4XX)
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#if !defined(__STM_UART_H__)
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#define __STM_UART_H__
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#include "Defines.h"
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#if defined(STM32F10X_MD)
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#include <stm32f10x.h>
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#elif defined(STM32F4XX)
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#include "stm32f4xx.h"
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#endif
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const uint16_t BUFFER_SIZE = 2048U; //needs to be a power of 2 !
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const uint16_t BUFFER_MASK = BUFFER_SIZE - 1;
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// ---------------------------------------------------------------------------
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// Class Declaration
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// ---------------------------------------------------------------------------
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/**
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* @brief This class represents a FIFO buffer on a STM32 UART.
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* @ingroup hotspot_fw
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*/
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class DSP_FW_API STM_UARTFIFO {
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public:
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/**
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* @brief Initializes a new instance of the STM_UARTFIFO class.
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*/
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STM_UARTFIFO() :
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m_head(0U),
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m_tail(0U)
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{
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/* stub */
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}
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/**
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* @brief
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* @returns uint8_t
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*/
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uint8_t get()
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{
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return m_buffer[BUFFER_MASK & (m_tail++)];
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}
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/**
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* @brief
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* @param data
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*/
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void put(uint8_t data)
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{
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m_buffer[BUFFER_MASK & (m_head++)] = data;
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}
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/**
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* @brief Helper to reset data values to defaults.
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*/
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void reset()
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{
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m_tail = 0U;
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m_head = 0U;
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}
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/**
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* @brief
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* @returns bool
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*/
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bool isEmpty()
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{
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return m_tail == m_head;
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}
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/**
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* @brief
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* @returns bool
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*/
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bool isFull()
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{
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return ((m_head + 1U) & BUFFER_MASK) == (m_tail & BUFFER_MASK);
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}
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private:
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volatile uint8_t m_buffer[BUFFER_SIZE];
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volatile uint16_t m_head;
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volatile uint16_t m_tail;
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};
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// ---------------------------------------------------------------------------
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// Class Declaration
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// ---------------------------------------------------------------------------
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/**
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* @brief This class represents an STM32 UART.
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* @ingroup hotspot_fw
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*/
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class STM_UART {
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public:
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/**
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* @brief Initializes a new instance of the STM_UART class.
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*/
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STM_UART();
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/**
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* @brief Initializes the UART.
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* @param usart
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*/
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void init(USART_TypeDef* usart);
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/**
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* @brief
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* @returns uint8_t
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*/
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uint8_t read();
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/**
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* @brief
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* @param[in] data
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* @param length
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*/
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void write(const uint8_t* data, uint16_t length);
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/**
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* @brief
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*/
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void handleIRQ();
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/**
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* @brief Flushes the transmit shift register.
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*
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* This call is blocking!
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*/
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void flush();
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/**
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* @brief
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* @returns uint16_t
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*/
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uint16_t available();
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/**
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* @brief
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* @returns uint16_t
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*/
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uint16_t availableForWrite();
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private:
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USART_TypeDef* m_usart;
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STM_UARTFIFO m_rxFifo;
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STM_UARTFIFO m_txFifo;
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};
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#endif // __SERIAL_PORT_H__
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#endif
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