In this tutorial, we will see STM32 UART Communication with example: you will learn how to Configure Registers for UART Communication. How to Send Data and Receive Data on UART port And Application of UART Communication in Embedded Application.
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STM32 UART Registers
GPIO Initialization
- RCC AHB1 peripheral clock enable register (RCC_AHB1ENR)
- GPIO alternate function low register (GPIOx_AFRL)
USART Initialization
- APB peripheral clock enable register 1 (RCC_APB1ENR)
- Baud rate register (USART_BRR)
- Control register 1 (USART_CR1)
- Control register 2 (USART_CR2)
- Control register 3 (USART_CR3)
- Transmit data register (USART_TDR)
- Receive data register (USART_RDR)
Programming for STM32 USART
USART Transmission
- The clock is running at 16 MHz.
- UART2 is configured for 9600 BaudRate.
- Pin PA2 Configured In Transmission mode for USART2 and Enable 8 Bit Data mode.
- Enable USART2 .
- Check Status register for Until TX buffer is empty .
- Pass 1 Byte Data to Data register for transmission.
USART Reception
- The clock is running at 16 MHz.
- UART2 is configured for 9600 BaudRate.
- Pin PA2 Configured In Receive mode for USART2 and Enable 8 Bit Data mode.
- Enable USART2 .
- Check Status register for Wait until char arrives
- Return Received Character.
Boudrate Calculation
Fck = 16 MHz, Tx baud = 9600, Rx baud= 9600
Register Configuration For STM32 USART
GPIO Initialization
RCC AHB1 peripheral clock enable register (RCC_AHB1ENR)
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USART Initialization
USART Transmission
Transmit 5 5 1 Cr2 Drive Mp4
GPIO alternate function low register (GPIOx_AFRL)
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APB peripheral clock enable register 1 (RCC_APB1ENR)
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Baud rate register (USART_BRR)
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Control register 1 (USART_CR1)
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Control register 2 (USART_CR2)
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Control register 3 (USART_CR3)
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Transmit data register (USART_TDR)
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USART Reception
GPIO alternate function low register (GPIOx_AFRL)
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APB peripheral clock enable register 1 (RCC_APB1ENR)
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Baud rate register (USART_BRR)
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Control register 1 (USART_CR1)
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Control register 2 (USART_CR2)
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Transmit 5 5 1 Cr2 Drive 3.0
Control register 3 (USART_CR3)
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Receive data register (USART_RDR)
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Code for STM32 USART with Example
Program for Transmit Character on USART
#include “stm32F4xx.h” void USART2_init(void); void USART2_write(int c); void DelayMs(int); /*————————MAIN function———————————–*/ int main (void) { USART2_init(); //Initialize USART2 while(1) { // Loop forever USART2_write(‘A’); USART2_write(‘n’) //leave a gap between messages DelayMs(10); } } /*———————–Initialize UART pins, Baudrate——————-*/ void USART2_init (void) { RCC->AHB1ENR |= 1; // Enable GPIOA clock RCC->APB1ENR |= 0x20000; //Enable USART2 clock /*——————- Configure PA2 for USART2_TX——————— */ GPIOA->AFR[0] &= ~0x0F00; GPIOA->AFR[0] |= 0x0700; //Alternate function for USART2 GPIOA->MODER &= ~0x0030; GPIOA->MODER |= 0x0020; //enable alternate function for PA2 USART2->BRR = 0x0683; //Set 9600 baudrate @ 16 MHz USART2->CR1 = 0x0008; //Enable Tx, 8-bit data mode USART2->CR2 = 0x0000; //1 stop bit USART2->CR3 = 0x0000; //No flow control USART2->CR1 |= 0x2000; //enable USART2 } /*——————- transmit character to USART2 ———————*/ void USART2_write (int ch) { while (!(USART2->SR & 0x0080)) {} // wait until Tx buffer empty USART2->DR = (ch & 0xFF); } void DelayMs(int n) { int i; for (; n > 0; n–) for (i = 0; i < 2000; i++) ; } |
Program for Receive Character on USART
5 1 Height Cm
#include “stm32F4xx.h” void USART2_init(void); char USART2_read(void); void DelayMs(int); /*————————MAIN function———————————–*/ int main (void) { char c; USART2_init(); //Initialize USART2 while(1) { // Loop forever c = USART2_read(); //wait for a character received DelayMs(10); } } /*———————–Initialize UART pins, Baudrate——————-*/ void USART2_init (void) { RCC->AHB1ENR |= 1; // Enable GPIOA clock Easy video converter pro 2 1 – video converter mp4. RCC->APB1ENR |= 0x20000; //Enable USART2 clock Opera 63 0 3368 66 inches. /*——————- Configure PA3 for USART2_RX——————— */ GPIOA->AFR[0] &= ~0xF000; GPIOA->AFR[0] |= 0x7000; //Alternate function for USART2 GPIOA->MODER &= ~0x00C0 GPIOA->MODER |= 0x0080; //Enable alternate function for PA3 USART2->BRR = 0x0683; //Set 9600 baudrate @ 16 MHz USART2->CR1 = 0x0004; //Enable Rx, 8-bit data mode USART2->CR2 = 0x0000; //1 stop bit USART2->CR3 = 0x0000; //No flow control USART2->CR1 |= 0x2000; //enable USART2 } /*——————- Receive character on USART2 ———————*/ char USART2_read(void) { while (!(USART2->SR & 0x0020)) {} // wait until char arrives return USART2->DR; } void DelayMs(int n) { int i; for (; n > 0; n–) for (i = 0; i < 2000; i++) ; } |