COCleverOS
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Serial Example

UART Smoke Test

Initialize the board serial port and print a repeating counter through a USB-to-UART adapter.

Download Code Back To Examples
Board LPCXpresso51U68 EVB OM40005
Status Verified
Download lpc51u68_uart_main.c

Run It

Use these commands from the COS workspace when the board and serial adapter are attached.

make -C firmware/lpc51u68_uart clean allmake -C firmware/lpc51u68_uart flashpython3 tools/uart_viewer.py --device <serial-device> --baud 9600

What To Look For

  • Serial output proves pin wiring and adapter ground are correct.
  • The counter proves the firmware remains alive after boot.
  • This gives every later RTOS example a debug channel.
Download Code From This Website Open Repository 
#include "cos_lpc51u68_bsp.h"

int main(void)
{
    uint32_t tick = 0;

    cos_lpc51u68_uart0_init_9600_8n1();
    cos_lpc51u68_uart0_puts("\r\nCOS LPC51U68 UART0 smoke test: 9600 8N1\r\n");

    for (;;) {
        cos_lpc51u68_uart0_puts("cos uart tick ");
        cos_lpc51u68_uart0_put_hex32(tick++);
        cos_lpc51u68_uart0_puts("\r\n");
        cos_lpc51u68_busy_delay(1200000u);
    }
}