driver_usart.rar_ring buffer

//*************************************************************************** // // Author(s)...: Pashgan http://ChipEnable.Ru // // Target(s)...: ATMega8535 // // Compiler....: IAR EWA 5.11A // // Description.: 滔甥閑� USART/UART � 蜻鼻獵順� 蛭繆曉� // // Data........: 3.01.10 // //*************************************************************************** #include "usart.h" //影蜥褓� 溫� 擋鼓義粵�� � 頑頜羨粵�� 頜綑權痢慷 usart`a #define EnableRxInt() UCSRB |= (1<<RXCIE); #define DisableRxInt() UCSRB &= (~(1<<RXCIE)); #define EnableTxInt() UCSRB |= (1<<TXCIE); #define DisableTxInt() UCSRB &= (~(1<<TXCIE)); //閱擇滓�慷 蛭繆� static volatile unsigned char usartTxBuf[SIZE_BUF]; static unsigned char txBufTail = 0; static unsigned char txBufHead = 0; static volatile unsigned char txCount = 0; //頜徹憧癮 蛭繆� static volatile unsigned char usartRxBuf[SIZE_BUF]; static unsigned char rxBufTail = 0; static unsigned char rxBufHead = 0; static volatile unsigned char rxCount = 0; //慚摟廓鞅頑甕� usart`a void USART_Init(void) { UBRRH = UBRRH_VALUE; UBRRL = UBRRL_VALUE; #if USE_2X UCSRA |= (1 << U2X); #else UCSRA &= (~(1 << U2X)); #endif UCSRB = (1<<RXCIE)|(1<<TXCIE)|(1<<RXEN)|(1<<TXEN); //擋鼓. 頜綑權 頜� 頜徹慮 � 閱擇滓鞣, 擋鼓 頜徹影, 擋鼓 閱擇滓鞣. UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0); //擋髡綑 縛蝴� 8 擋鼓�溜� } //______________________________________________________________________________ //隆頊擋麴綏 蜻領摺綁錳� 縊徵蝓蝴 閱擇滓�稞� 蛭繆擋 unsigned char USART_GetTxCount(void) { return txCount; } //"諄摧琯�" 閱擇滓�慷 蛭繆� void USART_FlushTxBuf(void) { txBufTail = 0; txCount = 0; txBufHead = 0; } //頡慮麴綏 縊徵蝓 � 蛭繆�, 慚摟態樽綏 熱闐餃 閱擇滓鞣 void USART_PutChar(unsigned char sym) { //綁鞅 憐溴鼻 usart 篛螂蝠粵 � �� 閱撼癮 縊徵蝓 //震羅� 稞� 頜�憐 � 擇媲羲� UDR if(((UCSRA & (1<<UDRE)) != 0) && (txCount == 0)) UDR = sym; else { if (txCount < SIZE_BUF){ //綁鞅 � 蛭繆擇 羨� 綁靦 慮羲� usartTxBuf[txBufTail] = sym; //頡慮麴粳 � 獗廈 縊徵蝓 txCount++; //慚蜥粳粵錚樽粳 膳綏鞣� 縊徵蝓蝴 txBufTail++; //� 慚滇蜴 避褓錶 蛭繆擋 if (txBufTail == SIZE_BUF) txBufTail = 0; } } } //縯璀甕� 頡興閤��� 羲曉蝕 頡 usart`� void USART_SendStr(unsigned char * data) { unsigned char sym; while(*data){ sym = *data++; USART_PutChar(sym); } } //螂擋菔霍慢 頜綑權痢�� 頡 頑閑橘粵斡 閱擇滓鞣 #pragma vector=USART_TXC_vect __interrupt void usart_txc_my(void) { if (txCount > 0){ //綁鞅 蛭繆� 獗 餓羲蝗 UDR = usartTxBuf[txBufHead]; //頑震興鈇粳 � UDR 縊徵蝓 愿 蛭繆擋 txCount--; //擭粵鱟琯� 膳綏鞣� 縊徵蝓蝴 txBufHead++; //慚蜥粳粵錚樽粳 慚滇蜴 廈餃順 蛭繆擋 if (txBufHead == SIZE_BUF) txBufHead = 0; } } //______________________________________________________________________________ //隆頊擋麴綏 蜻領摺綁錳� 縊徵蝓蝴 熱錨��孃鍥� � 頜徹憧衛 蛭繆擇 unsigned char USART_GetRxCount(void) { return rxCount; } //"諄摧琯�" 頜徹憧癮 蛭繆� void USART_FlushRxBuf(void) { DisableRxInt(); //頑頜羨琯� 頜綑權痢徹 頡 頑閑樹粵斡 頜徹影 rxBufTail = 0; rxBufHead = 0; rxCount = 0; EnableRxInt(); } //餾粵徹 蛭繆擋 unsigned char USART_GetChar(void) { unsigned char sym; if (rxCount > 0){ //綁鞅 頜徹憧癮 蛭繆� 獗 餓羲蝗 sym = usartRxBuf[rxBufHead]; //頜諄摘痞� 愿 獗廈 縊徵蝓 rxCount--; //擭粵鱟摘� 膳綏鞣� 縊徵蝓蝴 rxBufHead++; //慚蜥粳粵錚曉鈇靦 慚滇蜴 廈餃順 蛭繆擋 if (rxBufHead == SIZE_BUF) rxBufHead = 0; return sym; //閑曆檔� 頜諄摘痢磋� 縊徵蝓 } return 0; } //頜綑權痢徹 頡 頑閑橘粵斡 頜徹影 #pragma vector=USART_RXC_vect __interrupt void usart_rxc_my(void) { if (rxCount < SIZE_BUF){ //綁鞅 � 蛭繆擇 羨� 綁靦 慮羲� usartRxBuf[rxBufTail] = UDR; //膳摘痞� 縊徵蝓 愿 UDR � 蛭繆� rxBufTail++; //戴粱摺摘� 慚滇蜴 避褓錶 頜徹憧蝶� 蛭繆擋 if (rxBufTail == SIZE_BUF) rxBufTail = 0; rxCount++; //戴粱摺摘� 膳綏鞣� 頜慚�靜� 縊徵蝓蝴 } }