78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <termios.h>
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int main() {
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int uart0_filestream = -1;
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uart0_filestream = open("/dev/ttyAMA0", O_RDWR | O_NOCTTY | O_NDELAY);
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if (uart0_filestream == -1) {
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printf("[ERROR] UART open()\n");
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}
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struct termios options;
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tcgetattr(uart0_filestream, &options);
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options.c_cflag = B9600 | CS8 | CLOCAL | CREAD;
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options.c_iflag = IGNPAR;
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options.c_oflag = 0;
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options.c_lflag = 0;
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tcflush(uart0_filestream, TCIFLUSH);
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tcsetattr(uart0_filestream, TCSANOW, &options);
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// Bytes senden
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unsigned char BUF_TX[20];
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unsigned char *TX;
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TX = &BUF_TX[0];
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//*TX++ = 'R'; // -> decrease TTL
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*TX++ = 'P'; // -> do NOT decrease TTL
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/*
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*TX++ = 'a';
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*TX++ = 's';
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*TX++ = 'p';
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*TX++ = 'b';
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*TX++ = 'e';
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*TX++ = 'r';
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*TX++ = 'r';
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*TX++ = 'y';
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*TX++ = ' ';
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*TX++ = 'P';
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*TX++ = 'i';
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*/
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if (uart0_filestream != -1) {
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int out = write(uart0_filestream, &BUF_TX[0], (TX - &BUF_TX[0])); //
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if (out < 0) {
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printf("[ERROR] UART TX\n");
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} else {
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//printf("[STATUS: TX %i Bytes] %s\n", out, BUF_TX);
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}
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} // if uart0
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sleep(1);
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// Bytes empfangen
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if (uart0_filestream != -1) {
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unsigned char BUF_RX[1024];
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int rx_length = read(uart0_filestream, (void*)BUF_RX, 1024);
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if (rx_length < 0) {
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printf("[ERROR] UART RX\n");
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} else if (rx_length == 0) {
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printf("[ERROR] UART RX - no data\n");
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} else {
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BUF_RX[rx_length] = '\0';
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//printf("[STATUS: RX %i Bytes] %s\n", rx_length, BUF_RX);
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printf("%s", BUF_RX);
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} //rx_length check
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} //if uart0
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close(uart0_filestream);
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return 0;
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}
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