USART setup example

jgalea · ‎2009-02-11

Posted on February 11, 2009 at 13:27

USART setup example

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 13:02

Hello everyone. Please can anyone indicate to me a good example about USART setup in STM32F101x4? Many Thanks Johann

st3 · ‎2011-05-17

Posted on May 17, 2011 at 13:02

The ST FWLib includes a whole section full of USART examples.

Your tool provider probably also provides examples - like the classic ''Hello, World!''

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 13:02

Thanks. Please is it possible to indicate where the library is on the ST site as could not find it. many thanks Johann

kaouther · ‎2011-05-17

Posted on May 17, 2011 at 13:02

Here is the link for the

http://www.st.com/mcu/modules.php?name=mcu&file=familiesdocs&FAM=110#Firmware

.

Enjoy it ;)

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 13:02

Hello found the link but could not find the example Hello World. Im following other examples but still cannot transmit to the hyperterminal. Im using and IC to convert to the required logic signals. Thanks Johann

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 13:02

Thanks. If a set up the code will put it on the forum as I did with the DMA Johann

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 13:02

im using this code: Thanks

void USART_Set_up(void)

{

USART_InitTypeDef USART_InitStructure; //declaration of structure

// USART_ClockInitTypeDef USART_ClockInitStructure;

USART_DeInit(USART1); //places USART1 to default reset value

USART_InitStructure.USART_BaudRate = 9600;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_1;

USART_InitStructure.USART_Parity = USART_Parity_No;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_InitStructure.USART_Mode = USART_Mode_Tx;

USART_Init(USART1, &USART_InitStructure);

/* Enable the USART Transmoit interrupt: this interrupt is generated when the

USART1 transmit data register is empty */

//USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

/* Enable the USARTx */

USART_Cmd(USART1, ENABLE);

}

/* Send one HalfWord on USART1 */

USART_SendData(USART1, 0x26); //38 decimal

brunoalltest · ‎2011-05-17

Posted on May 17, 2011 at 13:02

You need to activate the clock of the serial before using any usart function.

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE)

You also need to configure the usart pins with something like this

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

/* USART1 Rx */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* USART1 Tx */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

jgalea · ‎2011-05-17

Posted on May 17, 2011 at 13:02

Dear brunoalltest. Many thanks the USART is transmitting. However I'm getting a different character in the hyperterminal. Please if you have time,do I need to use this line:

USART_SendData(USART1, 0x26); //38 decimal

/* Loop until the end of transmission */

while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)

{}

Im putting this line in a timer interrupt every 200us/

Thanks

Johann