//************************************************************************************ //** //** File name: D:\Data\Hobbies\Electronica\E-blocks\Eigen ontwerpen\RS232\Auto baud rate\RX UART Auto-Baud V3.c //** Title: //** Description: //** //** Generated by: Flowcode v5.5.0.1 //** Date: Sunday, January 27, 2013 18:54:46 //** Licence: Professional //** Registered to: Jan Lichtenbelt //** Licence key: M798V0 //** //** //** http://www.matrixmultimedia.com //** //************************************************************************************ #define MX_PIC #define MX_USES_UINT8 1 #define MX_USES_SINT16 0 #define MX_USES_CHAR 2 #define MX_USES_FLOAT 0 #define MX_USES_SINT32 0 #define MX_USES_BOOL 1 #define MX_USES_UINT16 1 #define MX_USES_UINT32 1 //Defines voor de microcontroller #define P16F1939 #define FC_CAL_PIC #define MX_ADC #define MX_ADC_TYPE_18 #define MX_ADC_BITS_10 #define MX_EE #define MX_EE_TYPE3 #define MX_EE_SIZE 256 #define MX_SPI_1 #define MX_SPI_1_MISO_PORT portc #define MX_SPI_1_MISO_TRIS trisc #define MX_SPI_1_MISO_PIN 4 #define MX_SPI_1_MOSI_PORT portc #define MX_SPI_1_MOSI_TRIS trisc #define MX_SPI_1_MOSI_PIN 5 #define MX_SPI_1_CLK_PORT portc #define MX_SPI_1_CLK_TRIS trisc #define MX_SPI_1_CLK_PIN 3 #define MX_SPI_1_SS_PORT portc #define MX_SPI_1_SS_TRIS trisc #define MX_UART_1 #define MX_UART_1_TX_PORT portc #define MX_UART_1_TX_TRIS trisc #define MX_UART_1_TX_PIN 6 #define MX_UART_1_RX_PORT portc #define MX_UART_1_RX_TRIS trisc #define MX_UART_1_RX_PIN 7 #define MX_I2C #define MX_MI2C #define MX_I2C_1 #define MX_I2C_1_SDA_PORT portc #define MX_I2C_1_SDA_TRIS trisc #define MX_I2C_1_SDA_PIN 4 #define MX_I2C_1_SCL_PORT portc #define MX_I2C_1_SCL_TRIS trisc #define MX_I2C_1_SCL_PIN 3 #define MX_PWM #define MX_PWM_CNT 5 #define MX_PWM_PSCA1 #define MX_PWM_PSCA4 #define MX_PWM_PSCA16 #define MX_PWM_1_PORT portc #define MX_PWM_1_TRIS trisc #define MX_PWM_1_PIN 2 #define MX_PWM_2_PORT portc #define MX_PWM_2_TRIS trisc #define MX_PWM_2_PIN 1 #define MX_PWM_2_PORT_A portb #define MX_PWM_2_TRIS_A trisb #define MX_PWM_2_PIN_A 3 #define MX_PWM_3_PORT porte #define MX_PWM_3_TRIS trise #define MX_PWM_3_PIN 0 #define MX_PWM_3_PORT_A portb #define MX_PWM_3_TRIS_A trisb #define MX_PWM_3_PIN_A 5 #define MX_PWM_4_PORT portd #define MX_PWM_4_TRIS trisd #define MX_PWM_4_PIN 1 #define MX_PWM_5_PORT porte #define MX_PWM_5_TRIS trise #define MX_PWM_5_PIN 2 //Functies #define MX_CLK_SPEED 19660800 #ifdef _BOOSTC #include #endif #ifdef HI_TECH_C #include #endif //Configuratiegegevens #ifdef _BOOSTC #pragma DATA 0x8007, 0xfe2 #endif #ifdef HI_TECH_C __CONFIG(0xfe2); #endif #ifdef _BOOSTC #pragma DATA 0x8008, 0x1633 #endif #ifdef HI_TECH_C __CONFIG(0x1633); #endif //Interne functies #include "C:\Program Files (x86)\Flowcode\v5\FCD\internals.c" //Macro functie declaraties MX_UINT32 FCM_ABD(MX_UINT32 FCL_BRG_FREQ); //Variable declaraties #define FCSZ_BAUDRATE_STRING 20 #define FCV_TRUE (1) #define FCV_FALSE (0) MX_UINT32 FCV_BAUD_RATE; MX_CHAR FCV_BAUDRATE_STRING[FCSZ_BAUDRATE_STRING]; MX_UINT8 FCV_TEMP; MX_UINT32 FCV_OSC_FREQ; //LCDDisplay(0): //Defines: /**** Macro Substitutions **** a = Unique Component Reference Number b = D1 Port Letter c = D2 Port Letter d = D3 Port Letter e = D4 Port Letter f = RS Port Letter g = E Port Letter h = Data 1_Pin i = Data 2 Pin j = Data 3 Pin k = Data 4 Pin l = RS Pin m = Enable Pin n = Row Count o = Column Count ******************************/ //component connections //Port pin lat workaround for 8-bit PIC devices running >= 32MHz //seems we need this mod for 19660800 16F1937 so changed to >= 16MHz #ifdef FC_CAL_PIC #if MX_CLK_SPEED >= 32000000 #define LCD_1__PORT0 latb #define LCD_1__PORT1 latb #define LCD_1__PORT2 latb #define LCD_1__PORT3 latb #define LCD_1__PORT4 latb #define LCD_1__PORT5 latb #else #ifdef MX_LCD_PORT_LAT #define LCD_1__PORT0 latb #define LCD_1__PORT1 latb #define LCD_1__PORT2 latb #define LCD_1__PORT3 latb #define LCD_1__PORT4 latb #define LCD_1__PORT5 latb #else #define LCD_1__PORT0 portb #define LCD_1__PORT1 portb #define LCD_1__PORT2 portb #define LCD_1__PORT3 portb #define LCD_1__PORT4 portb #define LCD_1__PORT5 portb #endif #endif #else #define LCD_1__PORT0 portb #define LCD_1__PORT1 portb #define LCD_1__PORT2 portb #define LCD_1__PORT3 portb #define LCD_1__PORT4 portb #define LCD_1__PORT5 portb #endif #define LCD_1__TRIS0 trisb #define LCD_1__TRIS1 trisb #define LCD_1__TRIS2 trisb #define LCD_1__TRIS3 trisb #define LCD_1__TRIS4 trisb #define LCD_1__TRIS5 trisb #define LCD_1__BIT0 0 #define LCD_1__BIT1 1 #define LCD_1__BIT2 2 #define LCD_1__BIT3 3 #define LCD_1__RS 4 #define LCD_1__E 5 #define LCD_1__ROWCNT 2 #define LCD_1__COLCNT 16 #ifdef _BOOSTC #define LCD_1__DELAY delay_10us(10) #endif #ifdef _C2C_ #define LCD_1__DELAY delay_us(100) #endif #ifdef HI_TECH_C #define LCD_1__DELAY __delay_us(120) #endif #ifndef LCD_1__DELAY #define LCD_1__DELAY delay_us(100) #endif //LCDDisplay(0): //Macro functie declaraties void FCD_LCDDisplay0_RawSend(MX_UINT8 in, MX_UINT8 mask); void FCD_LCDDisplay0_Start(); void FCD_LCDDisplay0_Clear(); void FCD_LCDDisplay0_PrintASCII(MX_UINT8 Character); void FCD_LCDDisplay0_Command(MX_UINT8 in); void FCD_LCDDisplay0_Cursor(MX_UINT8 x, MX_UINT8 y); void FCD_LCDDisplay0_PrintNumber(MX_SINT16 Number); void FCD_LCDDisplay0_PrintString(MX_STRING String, MX_UINT8 MSZ_String); void FCD_LCDDisplay0_ScrollDisplay(MX_UINT8 Direction, MX_UINT8 Num_Positions); void FCD_LCDDisplay0_ClearLine(MX_UINT8 Line); void FCD_LCDDisplay0_RAM_Write(MX_UINT8 nIdx, MX_UINT8 d0, MX_UINT8 d1, MX_UINT8 d2, MX_UINT8 d3, MX_UINT8 d4, MX_UINT8 d5, MX_UINT8 d6, MX_UINT8 d7); //LCDDisplay(0): //Macro implementaties void FCD_LCDDisplay0_RawSend(MX_UINT8 in, MX_UINT8 mask) { MX_UINT8 pt; FC_CAL_Bit_Low(LCD_1__PORT0, LCD_1__BIT0); FC_CAL_Bit_Low(LCD_1__PORT1, LCD_1__BIT1); FC_CAL_Bit_Low(LCD_1__PORT2, LCD_1__BIT2); FC_CAL_Bit_Low(LCD_1__PORT3, LCD_1__BIT3); FC_CAL_Bit_Low(LCD_1__PORT4, LCD_1__RS); FC_CAL_Bit_Low(LCD_1__PORT5, LCD_1__E); pt = ((in >> 4) & 0x0f); if (pt & 0x01) FC_CAL_Bit_High(LCD_1__PORT0, LCD_1__BIT0); if (pt & 0x02) FC_CAL_Bit_High(LCD_1__PORT1, LCD_1__BIT1); if (pt & 0x04) FC_CAL_Bit_High(LCD_1__PORT2, LCD_1__BIT2); if (pt & 0x08) FC_CAL_Bit_High(LCD_1__PORT3, LCD_1__BIT3); if (mask) FC_CAL_Bit_High(LCD_1__PORT4, LCD_1__RS); LCD_1__DELAY; FC_CAL_Bit_High (LCD_1__PORT5, LCD_1__E); LCD_1__DELAY; FC_CAL_Bit_Low (LCD_1__PORT5, LCD_1__E); pt = (in & 0x0f); LCD_1__DELAY; FC_CAL_Bit_Low(LCD_1__PORT0, LCD_1__BIT0); FC_CAL_Bit_Low(LCD_1__PORT1, LCD_1__BIT1); FC_CAL_Bit_Low(LCD_1__PORT2, LCD_1__BIT2); FC_CAL_Bit_Low(LCD_1__PORT3, LCD_1__BIT3); FC_CAL_Bit_Low(LCD_1__PORT4, LCD_1__RS); FC_CAL_Bit_Low(LCD_1__PORT5, LCD_1__E); if (pt & 0x01) FC_CAL_Bit_High(LCD_1__PORT0, LCD_1__BIT0); if (pt & 0x02) FC_CAL_Bit_High(LCD_1__PORT1, LCD_1__BIT1); if (pt & 0x04) FC_CAL_Bit_High(LCD_1__PORT2, LCD_1__BIT2); if (pt & 0x08) FC_CAL_Bit_High(LCD_1__PORT3, LCD_1__BIT3); if (mask) FC_CAL_Bit_High(LCD_1__PORT4, LCD_1__RS); LCD_1__DELAY; FC_CAL_Bit_High (LCD_1__PORT5, LCD_1__E); LCD_1__DELAY; FC_CAL_Bit_Low (LCD_1__PORT5, LCD_1__E); LCD_1__DELAY; } void FCD_LCDDisplay0_Start() { FC_CAL_Bit_Low_DDR(LCD_1__PORT0, LCD_1__TRIS0, LCD_1__BIT0); FC_CAL_Bit_Low_DDR(LCD_1__PORT1, LCD_1__TRIS1, LCD_1__BIT1); FC_CAL_Bit_Low_DDR(LCD_1__PORT2, LCD_1__TRIS2, LCD_1__BIT2); FC_CAL_Bit_Low_DDR(LCD_1__PORT3, LCD_1__TRIS3, LCD_1__BIT3); FC_CAL_Bit_Low_DDR(LCD_1__PORT4, LCD_1__TRIS4, LCD_1__RS); FC_CAL_Bit_Low_DDR(LCD_1__PORT5, LCD_1__TRIS5, LCD_1__E); Wdt_Delay_Ms(12); FCD_LCDDisplay0_RawSend(0x33, 0); Wdt_Delay_Ms(2); FCD_LCDDisplay0_RawSend(0x33, 0); Wdt_Delay_Ms(2); FCD_LCDDisplay0_RawSend(0x32, 0); Wdt_Delay_Ms(2); FCD_LCDDisplay0_RawSend(0x2c, 0); Wdt_Delay_Ms(2); FCD_LCDDisplay0_RawSend(0x06, 0); Wdt_Delay_Ms(2); FCD_LCDDisplay0_RawSend(0x0c, 0); Wdt_Delay_Ms(2); //clear the display FCD_LCDDisplay0_RawSend(0x01, 0); Wdt_Delay_Ms(2); FCD_LCDDisplay0_RawSend(0x02, 0); Wdt_Delay_Ms(2); } void FCD_LCDDisplay0_Clear() { FCD_LCDDisplay0_RawSend(0x01, 0); Wdt_Delay_Ms(2); FCD_LCDDisplay0_RawSend(0x02, 0); Wdt_Delay_Ms(2); } void FCD_LCDDisplay0_PrintASCII(MX_UINT8 Character) { FCD_LCDDisplay0_RawSend(Character, 0x10); } void FCD_LCDDisplay0_Command(MX_UINT8 in) { FCD_LCDDisplay0_RawSend(in, 0); Wdt_Delay_Ms(2); } void FCD_LCDDisplay0_Cursor(MX_UINT8 x, MX_UINT8 y) { #if (LCD_1__ROWCNT == 1) y=0x80; #endif #if (LCD_1__ROWCNT == 2) if (y==0) y=0x80; else y=0xc0; #endif #if (LCD_1__ROWCNT == 4) if (y==0) y=0x80; else if (y==1) y=0xc0; #if (LCD_1__COLCNT == 16) else if (y==2) y=0x90; else y=0xd0; #endif #if (LCD_1__COLCNT == 20) else if (y==2) y=0x94; else y=0xd4; #endif #endif FCD_LCDDisplay0_RawSend(y+x, 0); Wdt_Delay_Ms(2); } void FCD_LCDDisplay0_PrintNumber(MX_SINT16 Number) { MX_SINT16 tmp_int; MX_UINT8 tmp_byte; if (Number < 0) { FCD_LCDDisplay0_RawSend('-', 0x10); Number = 0 - Number; } tmp_int = Number; if (Number >= 10000) { tmp_byte = tmp_int / 10000; FCD_LCDDisplay0_RawSend('0' + tmp_byte, 0x10); while (tmp_byte > 0) { tmp_int = tmp_int - 10000; tmp_byte--; } } if (Number >= 1000) { tmp_byte = tmp_int / 1000; FCD_LCDDisplay0_RawSend('0' + tmp_byte, 0x10); while (tmp_byte > 0) { tmp_int = tmp_int - 1000; tmp_byte--; } } if (Number >= 100) { tmp_byte = tmp_int / 100; FCD_LCDDisplay0_RawSend('0' + tmp_byte, 0x10); while (tmp_byte > 0) { tmp_int = tmp_int - 100; tmp_byte--; } } if (Number >= 10) { tmp_byte = tmp_int / 10; FCD_LCDDisplay0_RawSend('0' + tmp_byte, 0x10); while (tmp_byte > 0) { tmp_int = tmp_int - 10; tmp_byte--; } } FCD_LCDDisplay0_RawSend('0' + tmp_int, 0x10); } void FCD_LCDDisplay0_PrintString(MX_STRING String, MX_UINT8 MSZ_String) { MX_UINT8 idx = 0; for (idx=0; idx> 5; st_bit(txsta,BRGH); // 1= high speed st_bit(baudcon,BRG16); // 1= 16 bit baud rate generator //Baud rate preset //C Code: FCL_BAUD_RATE = 0xFFFFFFFF; //Initialise EUSART Rx //C Code: cr_bit(txsta,SYNC); // set asynchronous mode st_bit(rcsta,SPEN); // Enable serial port (Rx,...) st_bit(rcsta,CREN); // enable asynchronous receiver //Label AUTOBAUD and set any baud rate //C Code: AUTOBAUD: spbrgh=0; // Baud Rate generator BRG spbrgl=31; // Baud Rate generator BRG //Check overflow and not busy //C Code: cr_bit(baudcon,ABDOVF); // clear ABD counter-overflow flag while (!(baudcon.RCIDL)); // check Auto-BRD is not busy //Wait until 'U' characters has been received //C Code: while (!(pir1.RCIF)); // wait until USART incoming 'U' // at the end ABDEN will be reset FCL_CHAR_IN= RCREG; // Read RCREG to clear RCIF interrupt bit // due to unknown baud rate, the contents of RCREG // does not have a meaning here FCL_COUNTS= spbrgh<<8+spbrgl-1; // place into Uint with correction of 1 FCL_COUNTS=FCL_COUNTS<<3; // BRG = BRG(during ABD)* 8 //Commentaar: //Ready. The rest is to show the result. //Save baud rate //C Code: spbrgh= FCL_COUNTS>>8; // replace into BRG spbrgl= FCL_COUNTS-spbrgh; //Show received character on LCD screen and on diodes on port D //C Code: while (!(baudcon.RCIDL)); // check Auto-BRD is not busy FCL_CHAR_IN= RCREG; // read new character FCD_LCDDisplay0_ClearLine(0); // clean line FCD_LCDDisplay0_PrintNumber(FCL_CHAR_IN); // print number trisd = 0x00; // set D as output portd = (FCL_CHAR_IN); // pint temp //Repeat procedure if no 'U'charachter has been detected //C Code: if (FCL_CHAR_IN != 'U') goto AUTOBAUD; // repeat if not ?U? //Baud rate to high (ABD counts <4) //Decision: .Counts < 32? if (FCL_COUNTS < 32) { //Wrong baud rate //Calculation: // .Return = 0xFFFFFFFF FCR_RETVAL = 0xFFFFFFFF; } else { //Calculate baud rate from # of counts //Calculation: // .Baud_Rate = .BRG_Freq // .Baud_Rate = .Baud_Rate / .Counts // .Return = .Baud_Rate FCL_BAUD_RATE = FCL_BRG_FREQ; FCL_BAUD_RATE = FCL_BAUD_RATE / FCL_COUNTS; FCR_RETVAL = FCL_BAUD_RATE; } return (FCR_RETVAL); //Definities van locale variabelen } void main() { //Initialisatie ansela = 0x00; anselb = 0x00; anseld = 0x00; ansele = 0x00; //Interrupt-initialisatiecode option_reg = 0xC0; //Commentaar: //Test Auto baud rate detection //Use PIC16F1939 with input on Rx (pin C7) //Use ABD macro with LCD output and LED outputs for testing //Principal: //1) Counts the 5 pulses of oscilator with frequency Fosc/32 of the incoming //character "U", start and stop bit included. //2) Read the U-charcater at least twice. First for the auto-baud detection // and second to check if the U-character is read correctly. //Refrences: //1) http://www.microchip.com/forums/m233642.aspx //2) Datasheet 16F1939 chapter 25 //January 27,2013 //Jan Lichtenbelt, NL //Start LCD //Component Macro Aanroepen: Start() FCD_LCDDisplay0_Start(); //Set Rx as input //Input: C7 -> Temp trisc = trisc | 0x80; FCV_TEMP = ((portc & 0x80) == 0x80); //Set microchip oscillator frequency //Calculation: // Osc_Freq = 19660800 // Hz FCV_OSC_FREQ = 19660800; //endless loop //Lus: While 1 while (1) { //Start Auto baud detection //Call Macro: Baud_Rate=ABD(Osc_Freq) FCV_BAUD_RATE = FCM_ABD(FCV_OSC_FREQ); //change into string //Calculation: // baudrate_string = tostring$ (Baud_Rate) FCI_TOSTRING(FCV_BAUD_RATE, FCV_BAUDRATE_STRING,FCSZ_BAUDRATE_STRING); //Show baud rate //Component Macro Aanroepen: PrintString(Baudrate_String) FCD_LCDDisplay0_PrintString(FCV_BAUDRATE_STRING, FCSZ_BAUDRATE_STRING); } mainendloop: goto mainendloop; } void MX_INTERRUPT_MACRO(void) { }