UART2 RX TX initialization

[pietruha8]

Posted on December 18, 2011 at 16:29

UART2 RX TX initialization-how to use?

Hello, I have problem with initialization UART2 in my project(STM8S105). Below you can see part of my code, what am i doing wrong?

I'm trying to send sign to LCD display. [code]

void UART2_Cmd(FunctionalState ENABLE);

void UART2_InitGPS() {     UART2_DeInit();     UART2_Init( (u32)9600, UART2_WORDLENGTH_8D, UART2_STOPBITS_1, UART2_PARITY_NO, UART2_SYNCMODE_CLOCK_DISABLE, UART2_MODE_TXRX_ENABLE);    } void UART2_SendData8(u8 Data); u8 UART2_ReceiveData8(void); void main(void) {     char tmp;     LCD5110_init();

//function which initialize LCD

    LCD5110_set_XY(0,0);

//function which set rows and columns in LCD

    UART2_SendData8(36);     UART2_ReceiveData8();     tmp = UART2_ReceiveData8();     LCD5110_write_char(tmp); //function which send characters to LCD } [/code]

I have to mention that i have no errors after compiling code and if I use function like this everything works fine(but I need UART to racive data from GPS and send it to LCD) :

[code]

void main(void)

{     char tmp=33; //33 -> ''!'' sign in my matrix(table or haw to name it)     LCD5110_init();

//function which initialize LCD

    LCD5110_set_XY(0,0);

//function which set rows and columns in LCD

       LCD5110_write_char(tmp); //function which send characters to LCD } [/code]

BR,

Konrad

P.S. If somebody wants to see whole code let me know 🙂

[Tesla DeLorean]

Posted on December 19, 2011 at 01:11

This isn't an STM8 forum.

Consider if the GPS is using 9600 8N1, a lot use 4800 8N1 Consider sending data in a loop, GPS sentences are often 80-100 characters in length, so you forward more than one character. In embedded you typically don't want to exit the main() subroutine.

[pietruha8]

Posted on December 19, 2011 at 23:46

Yes I know but I've had no answers on STM8 so I tried here. Thanks for answer, Stm8 are using 9600, I have it from examples. I'll try to send more data and let you know.

[pietruha8]

Posted on December 21, 2011 at 20:04

GPS is not connected now, i'm trying to send data in loop -> from PD5(UART2 Tx pin) to PD6

(UART2 Rx pin), trap is set in ''

LCD5110_write_char(gp);

'' line and i see that 'gp' variable is empty...

void UART2_Init(); void UART2_Cmd(); void GPIO_Init(); void UART2_SendData8(u8 Data); u8 UART2_ReceiveData8(void); void main(void) {     char gp;     char i;     u8 Data='k';     LCD5110_init();     LCD5110_set_XY(1,1);     UART2_Init( (u32)9600, UART2_WORDLENGTH_8D, UART2_STOPBITS_1, UART2_PARITY_NO, UART2_SYNCMODE_CLOCK_DISABLE, UART2_MODE_TXRX_ENABLE);     UART2_Cmd(ENABLE);     GPIO_Init(GPIOD, GPIO_PIN_5, GPIO_MODE_OUT_PP_HIGH_FAST );     GPIO_Init(GPIOD, GPIO_PIN_6, GPIO_MODE_IN_FL_NO_IT );     UART2_SendData8(Data);     UART2_ReceiveData8();     gp = UART2_ReceiveData8();     LCD5110_write_char(gp); }

[Tesla DeLorean]

Posted on December 21, 2011 at 20:38

Aren't you supposed to wait for the status to indicate a character is ready before reading it from the data register.

Receive: while(UART2_GetFlagStatus(UART2_FLAG_RXNE) == RESET); data = UART2_ReceiveData8(); Transmit: UART2_SendData8(byte); while(UART2_GetFlagStatus(UART2_FLAG_TXE) == RESET); BTW ST I really hate this stupid Word(tm) editor

[pietruha8]

Posted on December 21, 2011 at 21:10

I don't get it, where should I put those functions in this code?

[pietruha8]

Posted on December 21, 2011 at 21:15

AAAAA! I love you man! 🙂 thanks 🙂 It seems to be working now. Ok i will try to do some more things ... just to be sure

void UART2_Init(); void UART2_Cmd(); void GPIO_Init(); void UART2_SendData8(u8 Data); u8 UART2_ReceiveData8(void); void main(void) {     int gp;     u8 data;     u8 byte=66;     LCD5110_init(); //inicjalizacja LCD     LCD5110_set_XY(1,1); //ustawienie R i C     UART2_Init( (u32)9600, UART2_WORDLENGTH_8D, UART2_STOPBITS_1, UART2_PARITY_NO, UART2_SYNCMODE_CLOCK_DISABLE, UART2_MODE_TXRX_ENABLE); //Inicjalizacja UART2     UART2_Cmd(ENABLE); // Warunek konieczny do send i recieve     GPIO_Init(GPIOD, GPIO_PIN_5, GPIO_MODE_OUT_PP_HIGH_FAST );// przypisanie pinow     GPIO_Init(GPIOD, GPIO_PIN_6, GPIO_MODE_IN_FL_NO_IT );     //UART2_SendData8(data);     UART2_SendData8(byte);   while(UART2_GetFlagStatus(UART2_FLAG_TXE) == RESET);     //UART2_ReceiveData8();     while(UART2_GetFlagStatus(UART2_FLAG_RXNE) == RESET);   data = UART2_ReceiveData8();     gp = UART2_ReceiveData8();     LCD5110_LCD_write_byte(gp, 1); }