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vp-digi/Src/drivers/uart.c

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/*
This file is part of VP-Digi.
VP-Digi is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
VP-Digi is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with VP-Digi. If not, see <http://www.gnu.org/licenses/>.
*/
#include "drivers/uart.h"
#include "drivers/systick.h"
#include "terminal.h"
#include "ax25.h"
#include "common.h"
#include <string.h>
#include "digipeater.h"
Uart Uart1, Uart2, UartUsb;
//uint8_t Uart_txKiss(uint8_t *buf, uint16_t len)
//{
// if(len < 10) //frame is too small
// {
// return 1;
// }
//
// uint16_t framebegin = 0;
// uint8_t framestatus = 0; //0 - frame not started, 1 - frame start found, 2 - in a frame, 3 - frame end found
//
// for(uint16_t i = 0; i < len; i++)
// {
// if(*(buf + i) == 0xc0) //found KISS frame delimiter
// {
// if((i > 2) && (framestatus == 2)) //we are already in frame, this is the ending marker
// {
// framestatus = 3;
// ax25.frameXmit[ax25.xmitIdx++] = 0xFF; //write frame separator
// Digi_storeDeDupeFromXmitBuf(framebegin); //store duplicate protection hash
// if((FRAMEBUFLEN - ax25.xmitIdx) < (len - i + 2)) //there might be next frame in input buffer, but if there is no space for it, drop it
// break;
// }
// }
// else if((*(buf + i) == 0x00) && (*(buf + i - 1) == 0xC0) && ((framestatus == 0) || (framestatus == 3))) //found frame delimiter, modem number (0x00) and we are not in a frame yet or preceding frame has been processed
// {
// framestatus = 1; //copy next frame
// framebegin = ax25.xmitIdx;
// }
// else if((framestatus == 1) || (framestatus == 2)) //we are in a frame
// {
// ax25.frameXmit[ax25.xmitIdx++] = *(buf + i); //copy data
// framestatus = 2;
// }
// }
//
// return 0;
//}
static void handleInterrupt(Uart *port)
{
if(port->port->SR & USART_SR_RXNE) //byte received
{
port->port->SR &= ~USART_SR_RXNE;
port->rxBuffer[port->rxBufferHead++] = port->port->DR; //store it
port->rxBufferHead %= UART_BUFFER_SIZE;
// if(port->port == USART1) //handle special functions and characters
// term_handleSpecial(TERM_UART1);
// else if(port->port == USART2)
// term_handleSpecial(TERM_UART2);
if(port->mode == MODE_KISS)
port->kissTimer = ticks + (5000 / SYSTICK_INTERVAL); //set timeout to 5s in KISS mode
}
if(port->port->SR & USART_SR_IDLE) //line is idle, end of data reception
{
port->port->DR; //reset idle flag by dummy read
if(port->rxBufferHead != 0)
{
if((port->rxBuffer[0] == 0xC0) && (port->rxBuffer[port->rxBufferHead - 1] == 0xC0)) //data starts with 0xc0 and ends with 0xc0 - this is a KISS frame
{
port->rxType = DATA_KISS;
port->kissTimer = 0;
}
else if(((port->rxBuffer[port->rxBufferHead - 1] == '\r') || (port->rxBuffer[port->rxBufferHead - 1] == '\n'))) //data ends with \r or \n, process as data
{
port->rxType = DATA_TERM;
port->kissTimer = 0;
}
}
}
if(port->port->SR & USART_SR_TXE) //TX buffer empty
{
if((port->txBufferHead != port->txBufferTail) || port->txBufferFull) //if there is anything to transmit
{
port->port->DR = port->txBuffer[port->txBufferTail++]; //push it to the refister
port->txBufferTail %= UART_BUFFER_SIZE;
port->txBufferFull = 0;
}
else //nothing more to be transmitted
{
port->port->CR1 &= ~USART_CR1_TXEIE;
}
}
if((port->kissTimer > 0) && (ticks >= port->kissTimer)) //KISS timer timeout
{
port->kissTimer = 0;
port->rxBufferHead = 0;
memset(port->rxBuffer, 0, sizeof(port->rxBuffer));
}
}
void USART1_IRQHandler(void) __attribute__ ((interrupt));
void USART1_IRQHandler(void)
{
handleInterrupt(&Uart1);
}
void USART2_IRQHandler(void) __attribute__ ((interrupt));
void USART2_IRQHandler(void)
{
handleInterrupt(&Uart2);
}
void UartSendByte(Uart *port, uint8_t data)
{
if(!port->enabled)
return;
if(port->isUsb)
{
CDC_Transmit_FS(&data, 1);
}
else
{
while(port->txBufferFull)
;
port->txBuffer[port->txBufferHead++] = data;
port->txBufferHead %= UART_BUFFER_SIZE;
if(port->txBufferHead == port->txBufferTail)
port->txBufferFull = 1;
if(0 == (port->port->CR1 & USART_CR1_TXEIE))
port->port->CR1 |= USART_CR1_TXEIE;
}
}
void UartSendString(Uart *port, void *data, uint16_t len)
{
if(0 == len)
len = strlen((char*)data);
for(uint16_t i = 0; i < len; i++)
{
UartSendByte(port, ((uint8_t*)data)[i]);
}
}
static unsigned int findHighestPosition(unsigned int n)
{
unsigned int i = 1;
while((i * 10) <= n)
i *= 10;
return i;
}
void UartSendNumber(Uart *port, int32_t n)
{
if(n < 0)
UartSendByte(port, '-');
n = abs(n);
unsigned int position = findHighestPosition(n);
while(position)
{
unsigned int number = n / position;
UartSendByte(port, (number + 48));
n -= (number * position);
position /= 10;
}
}
void UartInit(Uart *port, USART_TypeDef *uart, uint32_t baud)
{
port->port = uart;
port->baudrate = baud;
port->rxType = DATA_NOTHING;
port->rxBufferHead = 0;
port->txBufferHead = 0;
port->txBufferTail = 0;
port->txBufferFull = 0;
port->mode = MODE_KISS;
port->enabled = 0;
port->kissTimer = 0;
memset(port->rxBuffer, 0, sizeof(port->rxBuffer));
memset(port->txBuffer, 0, sizeof(port->txBuffer));
}
void UartConfig(Uart *port, uint8_t state)
{
if(port->port == USART1)
{
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
GPIOA->CRH |= GPIO_CRH_MODE9_1;
GPIOA->CRH &= ~GPIO_CRH_CNF9_0;
GPIOA->CRH |= GPIO_CRH_CNF9_1;
GPIOA->CRH |= GPIO_CRH_CNF10_0;
GPIOA->CRH &= ~GPIO_CRH_CNF10_1;
USART1->BRR = (SystemCoreClock / (port->baudrate));
if(state)
USART1->CR1 |= USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE | USART_CR1_UE | USART_CR1_IDLEIE;
else
USART1->CR1 &= (~USART_CR1_RXNEIE) & (~USART_CR1_TE) & (~USART_CR1_RE) & (~USART_CR1_UE) & (~USART_CR1_IDLEIE);
NVIC_SetPriority(USART1_IRQn, 2);
if(state)
NVIC_EnableIRQ(USART1_IRQn);
else
NVIC_DisableIRQ(USART1_IRQn);
port->enabled = state > 0;
port->isUsb = 0;
}
else if(port->port == USART2)
{
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
GPIOA->CRL |= GPIO_CRL_MODE2_1;
GPIOA->CRL &= ~GPIO_CRL_CNF2_0;
GPIOA->CRL |= GPIO_CRL_CNF2_1;
GPIOA->CRL |= GPIO_CRL_CNF3_0;
GPIOA->CRL &= ~GPIO_CRL_CNF3_1;
USART2->BRR = (SystemCoreClock / (port->baudrate * 2));
if(state)
USART2->CR1 |= USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE | USART_CR1_UE | USART_CR1_IDLEIE;
else
USART2->CR1 &= (~USART_CR1_RXNEIE) & (~USART_CR1_TE) & (~USART_CR1_RE) & (~USART_CR1_UE) & (~USART_CR1_IDLEIE);
NVIC_SetPriority(USART2_IRQn, 2);
if(state)
NVIC_EnableIRQ(USART2_IRQn);
else
NVIC_DisableIRQ(USART2_IRQn);
port->enabled = state > 0;
port->isUsb = 0;
}
else
{
port->isUsb = 1;
port->enabled = state > 0;
}
}
void UartClearRx(Uart *port)
{
port->rxBufferHead = 0;
port->rxType = DATA_NOTHING;
}
void UartHandleKissTimeout(Uart *port)
{
if((port->kissTimer > 0) && (ticks >= port->kissTimer)) //KISS timer timeout
{
port->kissTimer = 0;
port->rxBufferHead = 0;
memset(port->rxBuffer, 0, sizeof(port->rxBuffer));
}
}