uart-echo

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

Source: examples/uart-echo/.

board.yaml

schema_version: 2

som:
  sku: E1M-AEN701

carrier:
  name: E1M-EVK

cores:
  m55_hp:
    os: zephyr
    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){
        .bus_id      = E1M_UART0,
        .baudrate    = 115200u,
        .data_bits   = 8,
        .stop_bits   = ALP_UART_STOP_1,
        .parity      = ALP_UART_PARITY_NONE,
        .flow_control= ALP_UART_FLOW_NONE,
    });
    if (uart == NULL) return -1;

    uint8_t byte;
    size_t got;
    while (1) {
        if (alp_uart_read(uart, &byte, 1, &got) == ALP_OK && got == 1) {
            alp_uart_write(uart, &byte, 1);
        }
    }
}

See also

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