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110 lines
2.2 KiB
110 lines
2.2 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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#if defined(STM32F10X_MD) || defined(STM32F4XX)
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#include "STM_UART.h"
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/* Initializes a new instance of the STM_UART class. */
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STM_UART::STM_UART() :
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m_usart(NULL)
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{
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/* stub */
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}
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/* */
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void STM_UART::init(USART_TypeDef* usart)
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{
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m_usart = usart;
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}
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/* */
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void STM_UART::write(const uint8_t* data, uint16_t length)
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{
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if (length == 0U || m_usart == NULL)
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return;
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m_txFifo.put(data[0]);
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USART_ITConfig(m_usart, USART_IT_TXE, ENABLE);//switch TX IRQ is on
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for (uint16_t i = 1U; i < length; i++) {
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m_txFifo.put(data[i]);
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}
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USART_ITConfig(m_usart, USART_IT_TXE, ENABLE);//make sure TX IRQ is on
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}
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/* */
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uint8_t STM_UART::read()
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{
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return m_rxFifo.get();
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}
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/* */
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void STM_UART::handleIRQ()
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{
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if (m_usart == NULL)
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return;
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if (USART_GetITStatus(m_usart, USART_IT_RXNE)) {
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if (!m_rxFifo.isFull())
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m_rxFifo.put((uint8_t)USART_ReceiveData(m_usart));
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USART_ClearITPendingBit(USART1, USART_IT_RXNE);
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}
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if (USART_GetITStatus(m_usart, USART_IT_TXE)) {
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if (!m_txFifo.isEmpty())
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USART_SendData(m_usart, m_txFifo.get());
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USART_ClearITPendingBit(m_usart, USART_IT_TXE);
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if (m_txFifo.isEmpty()) // if there's no more data to transmit then turn off TX interrupts
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USART_ITConfig(m_usart, USART_IT_TXE, DISABLE);
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}
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}
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/* Flushes the transmit shift register. */
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void STM_UART::flush()
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{
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if (m_usart == NULL)
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return;
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// wait until the TXE shows the shift register is empty
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while (USART_GetITStatus(m_usart, USART_FLAG_TXE))
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;
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}
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/* */
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uint16_t STM_UART::available()
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{
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return m_rxFifo.isEmpty() ? 0U : 1U;
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}
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/* */
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uint16_t STM_UART::availableForWrite()
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{
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return m_txFifo.isFull() ? 0U : 1U;
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}
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#endif
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