42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
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/* Extremely simple example that just reads from stdin and echoes back on stdout
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*
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* Has an easter egg, which is if you type "QUACK" it'll quack 3 times back at you.
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*
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* This example code is in the public domain
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*/
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#include "espressif/esp_common.h"
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#include <esp/uart.h>
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#include <string.h>
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void user_init(void)
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{
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printf("SDK version:%s\n", sdk_system_get_sdk_version());
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printf("Going into echo mode...\n");
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/* By default stdout is line-buffered, so you only see output
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after a newline is sent. This is helpful in a multithreaded
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environment so output doesn't get chopped up within a line.
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Here we want to see the echo immediately, so disable buffering.
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*/
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setbuf(stdout, NULL);
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while(1) {
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int c = getchar();
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if(c != EOF)
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putchar(c);
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/* Easter egg: check for a quack! */
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static int quack;
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if(c == "QUACK"[quack]) {
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quack++;
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if(quack == strlen("QUACK")) {
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printf("\nQUACK\nQUACK\n");
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quack = 0;
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}
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} else {
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quack = 0;
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}
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}
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}
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