writing data to USART1 of STM8L152

nanayakkaraan · ‎2010-09-29

Posted on September 30, 2010 at 05:20

lowpowermcu · ‎2011-05-17

Posted on May 17, 2011 at 15:10

Hi ANN,

When you write data in USART1_DR it is sent and you can't read it back from USART1_DR.

USART1_DR is for both writing data to be sent and reading received data.

If you want to make a test, you can connect Tx to Rx and you will read back your data.

That is my own understanding, perhaps ST people can confirm this.

regards,

MCU Lüfter

leoren_tm · ‎2011-05-17

Posted on May 17, 2011 at 15:10

Hi.

I have this, from STM sample library, maybe it can help

/*deinitilize systme remap*/

SYSCFG_REMAPDeInit();

/* Change RX-TX default map to A2-A3*/

SYSCFG_REMAPPinConfig(((uint16_t)0x011C),ENABLE);

/*Enable Usart clock */

CLK_PeripheralClockConfig(CLK_Peripheral_USART1, ENABLE);

/*Set the USART RX and USART TX at high level*/

GPIO_ExternalPullUpConfig(GPIOA, GPIO_Pin_2 , ENABLE);

GPIO_Init(GPIOA, GPIO_Pin_3, GPIO_Mode_In_PU_IT);

/* USART configuration ------------------------------------------------------*/

/* USART configured as follow:

- BaudRate = 115200 baud

- Word Length = 8 Bits

- One Stop Bit

- No parity

- Receive and transmit enabled

*/

USART_Init(USART1, (uint32_t)19200, USART_WordLength_8b, USART_StopBits_1,

USART_Parity_No, (USART_Mode_TypeDef)(USART_Mode_Rx | USART_Mode_Tx));

USART_SendData8(USART1,0x58);

lowpowermcu · ‎2011-05-17

Posted on May 17, 2011 at 15:10

Hi leo,

ANN is making doing an interesting job. He is using his own code and he doesn't like to use ST one (as I am doing now).

Good idea but that could be time consuming job.

MCU Lüfter

leoren_tm · ‎2011-05-17

Posted on May 17, 2011 at 15:10

Hi.

Yah it is. but time, time time............. :D

anyway, ST library is open, soo she can directly point it to library to get the real code, as datasheet is really not that complete, and which i think ST provided(the lib) to fill that ''not complete'' part.

Also, as ST said, there library set-up is compatible/almost same to there ST32, planning to jump on ST32 would be easy.

So your planning to make your library? 🙂

Have a nice-fun Coding Lüfter and ANN

nanayakkaraan · ‎2011-05-17

Posted on May 17, 2011 at 15:10

Hello Leo and lowpowerMCU,

Thanks for your replies.

Problem has been solved now.

What I want is not to build up my own lib.

I just want to understand the functionality of STM8L. A learning process.

Rather than using provided examples coding of my own makes the thing more understandable and controlable.

Thanks :p