Salve ho acquistato da poco la stm32f3 e stavo imparando un po ad utilizzarla attraverso chibios, volevo chiedere se qualcuno puo aiutarmi con la realizzazione di una comunicazione seriale con la scheda.
Invio un informazione alla scheda, viene elaborata e restituita..
è possibile?
Comunicazione Seriale
Moderator: RoccoMarco
Re: Comunicazione Seriale
Scopri il programma di esempio in C: \ ChibiStudio \ chibios \ testhal \ STM32F30x \ UART. Inizia con questo e vedere se fa quello che ti serve. C'è un sacco di roba di configurazione è necessario imparare per il futuro, ma questo programma di esempio permette di iniziare rapidamente.
Fare un tentativo e si sentono liberi di fare tutte le domande che avete.
Vi è anche un pilota di serie, ma non vi è un programma di esempio per la STM32F3 ancora. E 'un po' più facile da usare, ma non ti dà più controllo sulla connessione.
-John Scott
www.atl123.com
Fare un tentativo e si sentono liberi di fare tutte le domande che avete.
Vi è anche un pilota di serie, ma non vi è un programma di esempio per la STM32F3 ancora. E 'un po' più facile da usare, ma non ti dà più controllo sulla connessione.
-John Scott
www.atl123.com
Re: Comunicazione Seriale
purtroppo non riesco a farlo partire, mi puoi aiutare? copio il main di uart nel main della discovery ma non funziona.
Re: Comunicazione Seriale
Avete copiato l'intero progetto, o solo il file principale fuori del programma demo?
Ci sono molte opzioni di configurazione che sono necessari per far funzionare il driver Serial.
Inoltre, ciò che errore hai preso? Al fine di aiutare, abbiamo bisogno di ottenere quante più informazioni possibile. Inviare il tuo codice aiuta anche.
Che ambiente di sviluppo che si sta utilizzando?
Puoi pubblicare in inglese? E 'il linguaggio comune in questo forum.
-John Scott
www.atl123.com
Ci sono molte opzioni di configurazione che sono necessari per far funzionare il driver Serial.
Inoltre, ciò che errore hai preso? Al fine di aiutare, abbiamo bisogno di ottenere quante più informazioni possibile. Inviare il tuo codice aiuta anche.
Che ambiente di sviluppo che si sta utilizzando?
Puoi pubblicare in inglese? E 'il linguaggio comune in questo forum.
-John Scott
www.atl123.com
-
Giovanni
- Site Admin
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- Has thanked: 1202 times
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Re: Comunicazione Seriale
Correct, please English only, no matter how bad it is.
If this is a problem then feel free to PM me.
Per favore, solo Inglese, se per te è un problema mandami un messaggio privato.
Yes, it is possible, the demo ARMCM4-STM32F303-DISCOVERY already does most of what you need.
Si, è possible, la demo ARMCM4-STM32F303-DISCOVERY già fa molto di quello che chiedi.
Giovanni
If this is a problem then feel free to PM me.
Per favore, solo Inglese, se per te è un problema mandami un messaggio privato.
Salve ho acquistato da poco la stm32f3 e stavo imparando un po ad utilizzarla attraverso chibios, volevo chiedere se qualcuno puo aiutarmi con la realizzazione di una comunicazione seriale con la scheda.
Invio un informazione alla scheda, viene elaborata e restituita..
è possibile?
Yes, it is possible, the demo ARMCM4-STM32F303-DISCOVERY already does most of what you need.
Si, è possible, la demo ARMCM4-STM32F303-DISCOVERY già fa molto di quello che chiedi.
Giovanni
Re: Comunicazione Seriale
Hello I try to write in English, (pardon is an English school).
I was trying to do the writing and reading through serial but after doing the writing I can not properly be read, in the variable Nd do not see the character typed on the terminal (I included that needs to read only one character).
I wanted to ask if you could help me, and if I could explain what it is for chIOReadTimeout that appears in the warning.
I use CHIBIOS.
#include "ch.h"
#include "hal.h"
#include "test.h"
/*
*
* This is a periodic thread that does absolutely nothing except flashing LEDs.
*/
static WORKING_AREA(waThread1, 128);
static msg_t Thread1(void *arg) {
(void)arg;
chRegSetThreadName("blinker");
while (TRUE) {
palSetPad(GPIOE, GPIOE_LED3_RED);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED3_RED);
palSetPad(GPIOE, GPIOE_LED5_ORANGE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED5_ORANGE);
palSetPad(GPIOE, GPIOE_LED7_GREEN);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED7_GREEN);
palSetPad(GPIOE, GPIOE_LED9_BLUE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED9_BLUE);
palSetPad(GPIOE, GPIOE_LED10_RED);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED10_RED);
palSetPad(GPIOE, GPIOE_LED8_ORANGE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED8_ORANGE);
palSetPad(GPIOE, GPIOE_LED6_GREEN);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED6_GREEN);
palSetPad(GPIOE, GPIOE_LED4_BLUE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED4_BLUE);
}
return 0;}
/*
* Application entry point.
*/
int main(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
chSysInit();
/*
* Activates the serial driver 1 using the driver default configuration.
* PA9(TX) and PA10(RX) are routed to USART1.
*/
uint8_t Nd;
sdStart(&SD1, NULL);
palSetPadMode(GPIOA, 9, PAL_MODE_ALTERNATE(7));
palSetPadMode(GPIOA, 10, PAL_MODE_ALTERNATE(7));
sdWrite(&SD1,(uint8_t *)"Hello\n\r",6);
sdRead(&SD1,&Nd,1);
sdWrite(&SD1,(uint8_t *)"WORLD",5);
/*
* Creates the example thread.
*/
chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
/*
* Normal main() thread activity, in this demo it does nothing except
* sleeping in a loop and check the button state, when the button is
* pressed the test procedure is launched.
*/
while (TRUE) {
if (palReadPad(GPIOA, GPIOA_BUTTON))
TestThread(&SD1);
chThdSleepMilliseconds(500);
}
}
[/i][/i][/i][/i]
I was trying to do the writing and reading through serial but after doing the writing I can not properly be read, in the variable Nd do not see the character typed on the terminal (I included that needs to read only one character).
I wanted to ask if you could help me, and if I could explain what it is for chIOReadTimeout that appears in the warning.
I use CHIBIOS.
#include "ch.h"
#include "hal.h"
#include "test.h"
/*
*
* This is a periodic thread that does absolutely nothing except flashing LEDs.
*/
static WORKING_AREA(waThread1, 128);
static msg_t Thread1(void *arg) {
(void)arg;
chRegSetThreadName("blinker");
while (TRUE) {
palSetPad(GPIOE, GPIOE_LED3_RED);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED3_RED);
palSetPad(GPIOE, GPIOE_LED5_ORANGE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED5_ORANGE);
palSetPad(GPIOE, GPIOE_LED7_GREEN);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED7_GREEN);
palSetPad(GPIOE, GPIOE_LED9_BLUE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED9_BLUE);
palSetPad(GPIOE, GPIOE_LED10_RED);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED10_RED);
palSetPad(GPIOE, GPIOE_LED8_ORANGE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED8_ORANGE);
palSetPad(GPIOE, GPIOE_LED6_GREEN);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED6_GREEN);
palSetPad(GPIOE, GPIOE_LED4_BLUE);
chThdSleepMilliseconds(125);
palClearPad(GPIOE, GPIOE_LED4_BLUE);
}
return 0;}
/*
* Application entry point.
*/
int main(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
chSysInit();
/*
* Activates the serial driver 1 using the driver default configuration.
* PA9(TX) and PA10(RX) are routed to USART1.
*/
uint8_t Nd;
sdStart(&SD1, NULL);
palSetPadMode(GPIOA, 9, PAL_MODE_ALTERNATE(7));
palSetPadMode(GPIOA, 10, PAL_MODE_ALTERNATE(7));
sdWrite(&SD1,(uint8_t *)"Hello\n\r",6);
sdRead(&SD1,&Nd,1);
sdWrite(&SD1,(uint8_t *)"WORLD",5);
/*
* Creates the example thread.
*/
chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
/*
* Normal main() thread activity, in this demo it does nothing except
* sleeping in a loop and check the button state, when the button is
* pressed the test procedure is launched.
*/
while (TRUE) {
if (palReadPad(GPIOA, GPIOA_BUTTON))
TestThread(&SD1);
chThdSleepMilliseconds(500);
}
}
[/i][/i][/i][/i]
-
RoccoMarco
- Posts: 655
- Joined: Wed Apr 24, 2013 4:11 pm
- Has thanked: 83 times
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Re: Comunicazione Seriale
i think that your problem can be solved configuring properly the Serial Driver using sdStart. When the second argument of sdStart is NULL a default configuration is used:
you can find a big number of bitmask for usart in C:\ChibiStudio\chibios\os\hal\platforms\STM32F30x\stm32f30x.h
like these:
In order to use properly serial driver you need to read reference manual for stm32f30x, in this case usart chapter (starts @769), and understand how it works.
Rocco Marco
Code: Select all
static const SerialConfig default_config =
{
SERIAL_DEFAULT_BITRATE, /* BITRATE */
0, /* USART CR1 */
USART_CR2_STOP1_BITS | USART_CR2_LINEN, /* USART CR2 */
0 /* USART CR3 */
};you can find a big number of bitmask for usart in C:\ChibiStudio\chibios\os\hal\platforms\STM32F30x\stm32f30x.h
like these:
Code: Select all
/******************************************************************************/
/* */
/* Universal Synchronous Asynchronous Receiver Transmitter (USART) */
/* */
/******************************************************************************/
/****************** Bit definition for USART_CR1 register *******************/
#define USART_CR1_UE ((uint32_t)0x00000001) /*!< USART Enable */
#define USART_CR1_UESM ((uint32_t)0x00000002) /*!< USART Enable in STOP Mode */
#define USART_CR1_RE ((uint32_t)0x00000004) /*!< Receiver Enable */
#define USART_CR1_TE ((uint32_t)0x00000008) /*!< Transmitter Enable */
#define USART_CR1_IDLEIE ((uint32_t)0x00000010) /*!< IDLE Interrupt Enable */
#define USART_CR1_RXNEIE ((uint32_t)0x00000020) /*!< RXNE Interrupt Enable */
#define USART_CR1_TCIE ((uint32_t)0x00000040) /*!< Transmission Complete Interrupt Enable */
#define USART_CR1_TXEIE ((uint32_t)0x00000080) /*!< TXE Interrupt Enable */
#define USART_CR1_PEIE ((uint32_t)0x00000100) /*!< PE Interrupt Enable */
#define USART_CR1_PS ((uint32_t)0x00000200) /*!< Parity Selection */
#define USART_CR1_PCE ((uint32_t)0x00000400) /*!< Parity Control Enable */
#define USART_CR1_WAKE ((uint32_t)0x00000800) /*!< Receiver Wakeup method */
#define USART_CR1_M ((uint32_t)0x00001000) /*!< Word length */
#define USART_CR1_MME ((uint32_t)0x00002000) /*!< Mute Mode Enable */
#define USART_CR1_CMIE ((uint32_t)0x00004000) /*!< Character match interrupt enable */
#define USART_CR1_OVER8 ((uint32_t)0x00008000) /*!< Oversampling by 8-bit or 16-bit mode */
#define USART_CR1_DEDT ((uint32_t)0x001F0000) /*!< DEDT[4:0] bits (Driver Enable Deassertion Time) */
#define USART_CR1_DEDT_0 ((uint32_t)0x00010000) /*!< Bit 0 */
#define USART_CR1_DEDT_1 ((uint32_t)0x00020000) /*!< Bit 1 */
#define USART_CR1_DEDT_2 ((uint32_t)0x00040000) /*!< Bit 2 */
#define USART_CR1_DEDT_3 ((uint32_t)0x00080000) /*!< Bit 3 */
#define USART_CR1_DEDT_4 ((uint32_t)0x00100000) /*!< Bit 4 */
#define USART_CR1_DEAT ((uint32_t)0x03E00000) /*!< DEAT[4:0] bits (Driver Enable Assertion Time) */
#define USART_CR1_DEAT_0 ((uint32_t)0x00200000) /*!< Bit 0 */
#define USART_CR1_DEAT_1 ((uint32_t)0x00400000) /*!< Bit 1 */
#define USART_CR1_DEAT_2 ((uint32_t)0x00800000) /*!< Bit 2 */
#define USART_CR1_DEAT_3 ((uint32_t)0x01000000) /*!< Bit 3 */
#define USART_CR1_DEAT_4 ((uint32_t)0x02000000) /*!< Bit 4 */
#define USART_CR1_RTOIE ((uint32_t)0x04000000) /*!< Receive Time Out interrupt enable */
#define USART_CR1_EOBIE ((uint32_t)0x08000000) /*!< End of Block interrupt enable */
/****************** Bit definition for USART_CR2 register *******************/
#define USART_CR2_ADDM7 ((uint32_t)0x00000010) /*!< 7-bit or 4-bit Address Detection */
#define USART_CR2_LBDL ((uint32_t)0x00000020) /*!< LIN Break Detection Length */
#define USART_CR2_LBDIE ((uint32_t)0x00000040) /*!< LIN Break Detection Interrupt Enable */
#define USART_CR2_LBCL ((uint32_t)0x00000100) /*!< Last Bit Clock pulse */
#define USART_CR2_CPHA ((uint32_t)0x00000200) /*!< Clock Phase */
#define USART_CR2_CPOL ((uint32_t)0x00000400) /*!< Clock Polarity */
#define USART_CR2_CLKEN ((uint32_t)0x00000800) /*!< Clock Enable */
#define USART_CR2_STOP ((uint32_t)0x00003000) /*!< STOP[1:0] bits (STOP bits) */
#define USART_CR2_STOP_0 ((uint32_t)0x00001000) /*!< Bit 0 */
#define USART_CR2_STOP_1 ((uint32_t)0x00002000) /*!< Bit 1 */
#define USART_CR2_LINEN ((uint32_t)0x00004000) /*!< LIN mode enable */
#define USART_CR2_SWAP ((uint32_t)0x00008000) /*!< SWAP TX/RX pins */
#define USART_CR2_RXINV ((uint32_t)0x00010000) /*!< RX pin active level inversion */
#define USART_CR2_TXINV ((uint32_t)0x00020000) /*!< TX pin active level inversion */
#define USART_CR2_DATAINV ((uint32_t)0x00040000) /*!< Binary data inversion */
#define USART_CR2_MSBFIRST ((uint32_t)0x00080000) /*!< Most Significant Bit First */
#define USART_CR2_ABREN ((uint32_t)0x00100000) /*!< Auto Baud-Rate Enable*/
#define USART_CR2_ABRMODE ((uint32_t)0x00600000) /*!< ABRMOD[1:0] bits (Auto Baud-Rate Mode) */
#define USART_CR2_ABRMODE_0 ((uint32_t)0x00200000) /*!< Bit 0 */
#define USART_CR2_ABRMODE_1 ((uint32_t)0x00400000) /*!< Bit 1 */
#define USART_CR2_RTOEN ((uint32_t)0x00800000) /*!< Receiver Time-Out enable */
#define USART_CR2_ADD ((uint32_t)0xFF000000) /*!< Address of the USART node */
/****************** Bit definition for USART_CR3 register *******************/
#define USART_CR3_EIE ((uint32_t)0x00000001) /*!< Error Interrupt Enable */
#define USART_CR3_IREN ((uint32_t)0x00000002) /*!< IrDA mode Enable */
#define USART_CR3_IRLP ((uint32_t)0x00000004) /*!< IrDA Low-Power */
#define USART_CR3_HDSEL ((uint32_t)0x00000008) /*!< Half-Duplex Selection */
#define USART_CR3_NACK ((uint32_t)0x00000010) /*!< SmartCard NACK enable */
#define USART_CR3_SCEN ((uint32_t)0x00000020) /*!< SmartCard mode enable */
#define USART_CR3_DMAR ((uint32_t)0x00000040) /*!< DMA Enable Receiver */
#define USART_CR3_DMAT ((uint32_t)0x00000080) /*!< DMA Enable Transmitter */
#define USART_CR3_RTSE ((uint32_t)0x00000100) /*!< RTS Enable */
#define USART_CR3_CTSE ((uint32_t)0x00000200) /*!< CTS Enable */
#define USART_CR3_CTSIE ((uint32_t)0x00000400) /*!< CTS Interrupt Enable */
#define USART_CR3_ONEBIT ((uint32_t)0x00000800) /*!< One sample bit method enable */
#define USART_CR3_OVRDIS ((uint32_t)0x00001000) /*!< Overrun Disable */
#define USART_CR3_DDRE ((uint32_t)0x00002000) /*!< DMA Disable on Reception Error */
#define USART_CR3_DEM ((uint32_t)0x00004000) /*!< Driver Enable Mode */
#define USART_CR3_DEP ((uint32_t)0x00008000) /*!< Driver Enable Polarity Selection */
#define USART_CR3_SCARCNT ((uint32_t)0x000E0000) /*!< SCARCNT[2:0] bits (SmartCard Auto-Retry Count) */
#define USART_CR3_SCARCNT_0 ((uint32_t)0x00020000) /*!< Bit 0 */
#define USART_CR3_SCARCNT_1 ((uint32_t)0x00040000) /*!< Bit 1 */
#define USART_CR3_SCARCNT_2 ((uint32_t)0x00080000) /*!< Bit 2 */
#define USART_CR3_WUS ((uint32_t)0x00300000) /*!< WUS[1:0] bits (Wake UP Interrupt Flag Selection) */
#define USART_CR3_WUS_0 ((uint32_t)0x00100000) /*!< Bit 0 */
#define USART_CR3_WUS_1 ((uint32_t)0x00200000) /*!< Bit 1 */
#define USART_CR3_WUFIE ((uint32_t)0x00400000) /*!< Wake Up Interrupt Enable */
/****************** Bit definition for USART_BRR register *******************/
#define USART_BRR_DIV_FRACTION ((uint16_t)0x000F) /*!< Fraction of USARTDIV */
#define USART_BRR_DIV_MANTISSA ((uint16_t)0xFFF0) /*!< Mantissa of USARTDIV */
/****************** Bit definition for USART_GTPR register ******************/
#define USART_GTPR_PSC ((uint16_t)0x00FF) /*!< PSC[7:0] bits (Prescaler value) */
#define USART_GTPR_GT ((uint16_t)0xFF00) /*!< GT[7:0] bits (Guard time value) */
/******************* Bit definition for USART_RTOR register *****************/
#define USART_RTOR_RTO ((uint32_t)0x00FFFFFF) /*!< Receiver Time Out Value */
#define USART_RTOR_BLEN ((uint32_t)0xFF000000) /*!< Block Length */
/******************* Bit definition for USART_RQR register ******************/
#define USART_RQR_ABRRQ ((uint16_t)0x0001) /*!< Auto-Baud Rate Request */
#define USART_RQR_SBKRQ ((uint16_t)0x0002) /*!< Send Break Request */
#define USART_RQR_MMRQ ((uint16_t)0x0004) /*!< Mute Mode Request */
#define USART_RQR_RXFRQ ((uint16_t)0x0008) /*!< Receive Data flush Request */
#define USART_RQR_TXFRQ ((uint16_t)0x0010) /*!< Transmit data flush Request */
/******************* Bit definition for USART_ISR register ******************/
#define USART_ISR_PE ((uint32_t)0x00000001) /*!< Parity Error */
#define USART_ISR_FE ((uint32_t)0x00000002) /*!< Framing Error */
#define USART_ISR_NE ((uint32_t)0x00000004) /*!< Noise detected Flag */
#define USART_ISR_ORE ((uint32_t)0x00000008) /*!< OverRun Error */
#define USART_ISR_IDLE ((uint32_t)0x00000010) /*!< IDLE line detected */
#define USART_ISR_RXNE ((uint32_t)0x00000020) /*!< Read Data Register Not Empty */
#define USART_ISR_TC ((uint32_t)0x00000040) /*!< Transmission Complete */
#define USART_ISR_TXE ((uint32_t)0x00000080) /*!< Transmit Data Register Empty */
#define USART_ISR_LBD ((uint32_t)0x00000100) /*!< LIN Break Detection Flag */
#define USART_ISR_CTSIF ((uint32_t)0x00000200) /*!< CTS interrupt flag */
#define USART_ISR_CTS ((uint32_t)0x00000400) /*!< CTS flag */
#define USART_ISR_RTOF ((uint32_t)0x00000800) /*!< Receiver Time Out */
#define USART_ISR_EOBF ((uint32_t)0x00001000) /*!< End Of Block Flag */
#define USART_ISR_ABRE ((uint32_t)0x00004000) /*!< Auto-Baud Rate Error */
#define USART_ISR_ABRF ((uint32_t)0x00008000) /*!< Auto-Baud Rate Flag */
#define USART_ISR_BUSY ((uint32_t)0x00010000) /*!< Busy Flag */
#define USART_ISR_CMF ((uint32_t)0x00020000) /*!< Character Match Flag */
#define USART_ISR_SBKF ((uint32_t)0x00040000) /*!< Send Break Flag */
#define USART_ISR_RWU ((uint32_t)0x00080000) /*!< Receive Wake Up from mute mode Flag */
#define USART_ISR_WUF ((uint32_t)0x00100000) /*!< Wake Up from stop mode Flag */
#define USART_ISR_TEACK ((uint32_t)0x00200000) /*!< Transmit Enable Acknowledge Flag */
#define USART_ISR_REACK ((uint32_t)0x00400000) /*!< Receive Enable Acknowledge Flag */
/******************* Bit definition for USART_ICR register ******************/
#define USART_ICR_PECF ((uint32_t)0x00000001) /*!< Parity Error Clear Flag */
#define USART_ICR_FECF ((uint32_t)0x00000002) /*!< Framing Error Clear Flag */
#define USART_ICR_NCF ((uint32_t)0x00000004) /*!< Noise detected Clear Flag */
#define USART_ICR_ORECF ((uint32_t)0x00000008) /*!< OverRun Error Clear Flag */
#define USART_ICR_IDLECF ((uint32_t)0x00000010) /*!< IDLE line detected Clear Flag */
#define USART_ICR_TCCF ((uint32_t)0x00000040) /*!< Transmission Complete Clear Flag */
#define USART_ICR_LBDCF ((uint32_t)0x00000100) /*!< LIN Break Detection Clear Flag */
#define USART_ICR_CTSCF ((uint32_t)0x00000200) /*!< CTS Interrupt Clear Flag */
#define USART_ICR_RTOCF ((uint32_t)0x00000800) /*!< Receiver Time Out Clear Flag */
#define USART_ICR_EOBCF ((uint32_t)0x00001000) /*!< End Of Block Clear Flag */
#define USART_ICR_CMCF ((uint32_t)0x00020000) /*!< Character Match Clear Flag */
#define USART_ICR_WUCF ((uint32_t)0x00100000) /*!< Wake Up from stop mode Clear Flag */
/******************* Bit definition for USART_RDR register ******************/
#define USART_RDR_RDR ((uint16_t)0x01FF) /*!< RDR[8:0] bits (Receive Data value) */
/******************* Bit definition for USART_TDR register ******************/
#define USART_TDR_TDR ((uint16_t)0x01FF) /*!< TDR[8:0] bits (Transmit Data value) */
In order to use properly serial driver you need to read reference manual for stm32f30x, in this case usart chapter (starts @769), and understand how it works.
Rocco Marco