[717405]: rx_ringbuffer.c Maximize Restore History

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rx_ringbuffer.c    62 lines (47 with data), 1.4 kB

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/*
Copyright (C) 2012 Georg Ottinger
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "includes.h"
unsigned char rx_ring[256];
unsigned char rx_head;
unsigned char rx_tail;
void InitRXBuffer()
{
rx_head = 0;
rx_tail = 0;
ITC_SetSoftwarePriority(ITC_IRQ_UART2_RX, ITC_PRIORITYLEVEL_3);
UART2_ITConfig(UART2_IT_RXNE_OR, ENABLE);
}
#pragma vector = UART2_RX_vector
__interrupt void UART_RX_vector(void)
{
rx_ring[rx_head] = UART2->DR;
if(UART2_HasError())
{
rs232_rx_errors++;
} else {
rx_head++;
}
}
unsigned char RXBuffer_HasBytes()
{
return rx_head - rx_tail;
}
unsigned char RXBuffer_ReadBytes()
{
unsigned char temp;
temp = rx_ring[rx_tail];
rx_tail++;
return temp;
}