problem s uartem procesoru PIC32MX795F512L - poskozeny prvni byte

[tomas mainzer]

Dobry den,
omlouvam se, spise jen obecne tipy ale mam tu take jeden projekt s timto
procesorem a prvni prijaty byte je ok.
mazete pri inicializaci priznaky chyb? nemate zapnutou autodetekci
rychlosti? neprijimate znak drive nez se stabilizuji hodiny procesoru?
nenabehne procesor rychleji nez to co je povesene na pinu UARTU a neprijme
tak chybny znak?
S pozdravem TM.

P.S. Muj inicializacni kod vypada nasledovne, ale pouzivame zrejme jine
knihovny + je to dost silene makro takze vam to asi prilis nepomuze:
#define uartini(name) \
  UARTConfigure( name ## _UART, UART_ENABLE_PINS_TX_RX_ONLY); \
  UARTSetLineControl( name ## _UART, UART_DATA_SIZE_8_BITS |
UART_PARITY_NONE | UART_STOP_BITS_1); \
  UARTSetDataRate( name ## _UART, pc, name ## _BAUD); \
  UARTEnable( name ## _UART, UART_ENABLE_FLAGS(UART_PERIPHERAL | UART_RX |
UART_TX));




2015-07-08 20:40 GMT+02:00 <nevrklap na volny.cz>:

> Zdravim,
> mame tu dva male projekty zalozene na procesoru PIC32MX795F512L..
> (Microchip si vybral kolega programator, prosim nekomentovat :-)
> V obou pripadech se projevuje stejny problem - prvni byte (po zapnuti
> zarizeni) prijaty pres UART (odeslany typicky z PC) se neprijme korektne...
> vyvola se korektne preruseni, ale precte se nesmysl. Dalsi znaky uz chodi v
> poradku (vsechno typicky jednobytove prikazy..).
> Je to ponekud otravne, nesetkal se s tim prosim nekdo?  Tento odkaz jsem
> kolegovi daval http://www.microchip.com/forums/m531951.aspx  ale zatim to
> nepomohlo...
> Nize je vyseknuty kod, ktery zmineny UART pouziva, pokud by mel nekdo chut
> se na to mrknout...
> Diky moc
> P.
>
>
>
>
>
> #include <plib.h>
> #include <stdlib.h>
>
> #define UART_HS_9600_ID              (3)     // Identifikator
> #define UART_HS_9600_BRG             (1041)  // BRG value
> #define UART_HS_9600_BRGH            (1)     // BRGH (high speed)
>
> #define UART_HS_115200_ID            (9)     // Identifikator
> #define UART_HS_115200_BRG           (86)    // BRG value
> #define UART_HS_115200_BRGH          (1)     // BRGH (high speed)
>
> #define UART_B_COMPILER              UART2
>
>
> /**
>  * Init UART module
>  */
> void UartInit(void){
>     PORTSetPinsDigitalIn(IOPORT_UART_RX, BIT_UART_RX); // INPUT
>     PORTReadBits(IOPORT_UART_RX, BIT_UART_RX);
>     PORTSetPinsDigitalOut(IOPORT_UART_TX, BIT_UART_TX); // OUTPUT
>     PORTSetBits(IOPORT_UART_TX, BIT_UART_TX);
>
>
>     U2MODE = 0x8000; // Enable UART for 8-bit data, No parity, 1 stop
>     U2MODESET = 0x80; // Enable UART wake-up from sleep
>
>     // Nastavim Baud Rate pro High Speed rezim:
>     UART_Sens_B_SetBrg(psUART_Sens_B->psCfg->ucBaudRateID, SYS_CLK_HS);
>
>
>     // Parity, stopbit:
>     U2MODECLR = 0b110; // b2-1 = 8-bit data, no parity
>     U2MODECLR = 1; // b0 = One stop bit
>
>     // Nastavim preruseni (PIC32MX795F512L.pdf str 123, Sec. 21 UART.pdf,
> str 23):
>     IEC1SET = 0b1000000000; // set the UxRXIE bit in the corresponding
> Interrupt Enable Control register (IEC).
>     IPC8SET = 0b1100; // Priority 3, b4:2 - Specify the priority (0 - 7, 0
> = ISR disable) and subpriority for the interrupt using the UxIP<2:0> and
> UxIS<1:0>
>     IPC8SET = 0b10; // Subpriority 2, b1:0 - subpriority
>
>     U2STA = 0; // Clear register
>     U2STACLR = 0b11000000; // b7:6 - Interrupt flag bit is asserted while
> receive buffer is not empty
>     U2STASET = 0x1400; // Enable Transmit and Receive
> }
>
>
> /**
>  * Change UART speed on-the-fly
>  */
> void UART_Sens_B_SetBrg(unsigned char ucBaudRateID) {
>     unsigned short usBackUp;
>
>
>     // Disable Rx and Tx
>     usBackUp = U2STA & 0x1400; // Backup actuall state.
>     U2STACLR = 0x1400;  // Disable
>
>     // Clear b3 = BRGH
>     U2MODECLR = 0b1000;
>
>     // Nastavim Baud Rate
>     switch (psUART_Sens_B->psCfg->ucBaudRateID) {
>         case UART_HS_9600_ID:
>             U2BRG = UART_HS_9600_BRG; // Set Baud rate
>             U2MODESET = UART_HS_9600_BRGH << 3; // b3 = BRGH
>             break;
>         case UART_HS_115200_ID:
>             U2BRG = UART_HS_115200_BRG; // Set Baud rate
>             U2MODESET = UART_HS_115200_BRGH << 3; // b3 = BRGH
>             break;
>     }
>
>     // Reenable UART module:
>     U2STASET = usBackUp;        // Backuped value
>     return;
> }
>
>
>
> /**
>  * UART 2 interrupt handler, the priority set in init function
>  */
> void __ISR(_UART_2_VECTOR, ipl3) IntUart2Handler(void) {
>     volatile char cDummy;
>
>     //Is this an RX interrupt?
>     if (INTGetFlag(INT_SOURCE_UART_RX(UART_B_COMPILER))) {
>         cDummy = UARTGetDataByte(UART_B_COMPILER);      // Get data
>         INTClearFlag(INT_SOURCE_UART_RX(UART_B_COMPILER)); // Clear the RX
> interrupt Flag
>         QueueInsertLast(psQueueB, cDummy);      // Save data to my buffer
>     }
>
>     // We don't care about TX interrupt
>     if (INTGetFlag(INT_SOURCE_UART_TX(UART_B_COMPILER))) {
>         INTClearFlag(INT_SOURCE_UART_TX(UART_B_COMPILER));
>     }
> }
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