uart-echo

UART RX → TX echo loop. The minimal demo for <alp/peripheral.h>'s UART class.

Source: examples/uart-echo/.

board.yaml

som:
  sku: E1M-AEN701

preset: e1m-evk

cores:
  m55_hp:
    app: ./src
    peripherals: [uart]

diagnostics:
  log_level: info

Source (abbreviated)

#include <alp/peripheral.h>
#include <alp/e1m_pinout.h>

int main(void) {
    alp_uart_t *uart = alp_uart_open(&(alp_uart_config_t){
        .port_id   = ALP_E1M_UART0,
        .baudrate  = 115200u,
        .data_bits = 8,
        .stop_bits = 1,
        .parity    = ALP_UART_PARITY_NONE,
    });
    if (uart == NULL) return -1;

    uint8_t byte;
    while (1) {
        /* Block until a byte arrives (UINT32_MAX = wait forever), echo it. */
        if (alp_uart_read(uart, &byte, 1, UINT32_MAX) == ALP_OK) {
            alp_uart_write(uart, &byte, 1);
        }
    }
}

See also

• <alp/peripheral.h> reference — UART
• uart-rx-ringbuf — interrupt-driven variant
• Examples overview