// Default USART configuration structure USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT; init.baudrate = 115200; init.databits = usartDatabits8; init.parity = usartNoParity; init.stopbits = usartStopbits1;
// Buffers char tx_buffer[64]; char rx_byte;
Universal Asynchronous Receiver-Transmitter (UART) is one of the most fundamental and widely used interfaces in embedded systems. Whether you are debugging via logs, communicating with a sensor, or interfacing with a GSM module, UART is often the go-to protocol.
// Initialize USART USART_InitAsync(UART_HANDLE, &init); simplicity studio uart example
// Function to initialize UART void uart_init(void) // Enable clock for USART CMU_ClockEnable(UART_CLOCK, true);
// Initialize UART uart_init();
// Simple string transmit function void uart_send_string(const char *str) while (*str) USART_Tx(UART_HANDLE, *str++); init.baudrate = 115200
// Enable RX interrupt (optional but useful) USART_IntEnable(UART_HANDLE, USART_IEN_RXDATAV); NVIC_EnableIRQ(USART0_RX_IRQn);
// Interrupt handler for receiving data void USART0_RX_IRQHandler(void) if (USART_IntGet(UART_HANDLE) & USART_IF_RXDATAV) rx_byte = USART_Rx(UART_HANDLE); // Echo the character back USART_Tx(UART_HANDLE, rx_byte);
Create a new file main.c and add the following code: init.databits = usartDatabits8
#include "em_device.h" #include "em_chip.h" #include "em_cmu.h" #include "em_gpio.h" #include "em_usart.h" #include <string.h> // USART instance – change to your selected peripheral #define UART_HANDLE USART0 #define UART_CLOCK cmuClock_USART0
int main(void) // Chip initialization (important for errata) CHIP_Init();
Introduction
// Configure USART pins (using location specific to your board) // For example: Route TX to PA0, RX to PA1 GPIO_PinModeSet(gpioPortA, 0, gpioModePushPull, 1); // TX GPIO_PinModeSet(gpioPortA, 1, gpioModeInput, 0); // RX
// Send welcome message uart_send_string("Simplicity Studio UART Example\r\n"); uart_send_string("Type something, and I will echo it back:\r\n");