我正在尝试编写一个简单的程序，当用户输入“motor”＆amp; “25”电机将以25°顺时针方向和25°逆时针方向旋转
//Define clock-speed and include necessary headers
#define F_CPU 1000000
#include <avr/io.h>
#include <util/delay.h>
#include <inttypes.h>
#include <avr/io.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include <stdint.h>
#include <util/delay.h>
#include <ctype.h>
#define F_CPU 16000000UL
#define BAUD 9600UL
char cmd[40];
void uart_init(void) // initializing UART
{
UBRRH = 0;
UBRRL = ((F_CPU+BAUD*8)/(BAUD*16)-1);
UCSRC |= 0x86; // 8N1 Data
UCSRB = 0x18; // Receiving and Transmitting
}
int uart_putch(char ch, FILE *stream) // Function for sending Data to PC
{
if (ch == '\n')
uart_putch('\r', stream);
while (!(UCSRA & (1<<UDRE)));
UDR=ch;
return 0;
}
int uart_getch(FILE *stream) // Function for receiving Data from PC
{
unsigned char ch; while (!(UCSRA & (1<<RXC)));
ch=UDR;
uart_putch(ch,stream); // Echo the output back to the terminal
return (tolower(ch));
}
FILE uart_str = FDEV_SETUP_STREAM(uart_putch, uart_getch, _FDEV_SETUP_RW); // Important, not deleting
void loeschen() // Delete the String
{
int strnglen = 0;
while (strnglen < 41 && cmd[strnglen] != 0)
{
cmd[strnglen]= 0;
strnglen++;
}
}
// Define the stepping angle
// Note: Divide by 2 if you are doing half-stepping. for filter test 1.8 defult
#define MIN_STEP 1.8
/* Define an array containing values to be sent at the required Port - for Full-stepping
<first four bits> - <last four bits> = <decimal equivalent>
00000001 = 1 ; 01000000 = 4
00000100 = 4 ; 00010000 = 16
00000010 = 2 ; 00001000 = 8
00001000 = 8 ; 00100000 = 32
*/
unsigned short control_array_full[4] = {4,16,8,32};
/* Define an array containing values to be sent at the required Port - for Half-stepping
<first four bits> - <last four bits> = <decimal equivalent>
0000-1001 = 8 + 1 = 9 ; 0010-0100 = 32 + 4 =36
0000-0001 = 1 ; 0000-0100 = 4
0000-0101 = 4 + 1 = 5 ; 00010100 = 16 + 4 = 20
00000100 = 4 ; 00010000 = 16
00000110 = 4 + 2 = 6 ; 00011000 = 16+8=24
0000-0010 = ; 00-001000 = 8
0000-1010 = 8 + 2 = 10 ; 00-101000 = 40
0000-1000 = 8 ; 00-100000 = 32
*/
unsigned short control_array_half[8] = {36,4,20,16,24,8,40,32};
// Adjust this delay to control effective RPM
// Do not make it very small as rotor will not be able to move so fast
// Currently set at 100ms
void delay()
{
_delay_ms(100);
}
void move_clockwise(unsigned short revolutions){
int i=0;
for (i=0; i < (revolutions* 360 /MIN_STEP) ; i++)
{
//Note: Take modulo (%) with 8 when half-stepping and change array too
PORTD = control_array_half[i % 4];
delay();
}
}
void move_anticlockwise(unsigned short revolutions){
int i;
for (i = (revolutions* 360 /MIN_STEP); i > 0 ; i--){
//Note: Take modulo (%) with 8 when half-stepping and change array too
PORTD = control_array_half[i % 4];
delay();
}
}
int main()
{
// Enter infinte loop
// Make changes here to suit your requirements
uart_init(); // initializing UART
stdout = stdin = &uart_str; // Necessary to compare whole Strings
while(1){
scanf("%s",&cmd); // Read String from Data Register
printf ("Please enter number of motor rotation for clockwise and anticlockwise");
items_read = scanf ("%d", &numbers[i]); // Read integer for motor revolution
if(strcmp(cmd, "motor") == 0)
{
DDRD = 0b00111110; //Set PORTD 4 bits for output
//Enter number of revolutions required in brackets
move_clockwise(items_read);
move_anticlockwise(items_read);
}
DDRD = 0b00000000;
}
loeschen();
}
现在，问题是当我从main（）
中删除这些行时 items_read = scanf ("%d", &numbers[i]);
scanf ("%d",&i);
＆安培;在move_clockwise(items_read);中将items_read设为：
move_clockwise(25);
move_anticlockwise(25);
然后当用户输入“motor”然后电机正在运行move_clockwise(25);但是move_anticlockwise(25);没有运行，我想要的是“电机”，顺时针编号和逆时针编号。 ..
如果有人能帮助我，我真的很感激！ 提前谢谢！
答案 0 :(得分：0)
首先，在我看来，你只是在loeschen（）中清除“cmd”，但你永远不会有任何价值。 第二个“cmd”不是任何类型的UART dataregister。
DDRD是DataDirectionRegister D，这意味着您可以将某个引脚设置为输入或输出模式。
使用PORTD将引脚设置为高电平或低电平，例如PORTD |= 1<<PD0;将端口D引脚0设置为高电平。
我想您更喜欢德语文档，因为您将一个函数命名为“loeschen（）”;-)，那么为什么不访问mikrocontroller.net AVR GCC Tutorial (UART)？
如果你喜欢更多技术细节的youtube-stuff，瞧瞧：Introduction to UART
RXT（ATMEGA16） - 例如：
//////////////////////////////////////////////////////////////////////////
// Definitions
//////////////////////////////////////////////////////////////////////////
#define BAUD 9600UL
#define UBRR_VAL ((F_CPU+BAUD*8)/(BAUD*16)-1)
#define BAUD_REAL (F_CPU/(16*(UBRR_VAL+1)))
#define BAUD_ERROR ((BAUD_REAL*1000)/BAUD)
#if ((BAUD_ERROR<990) || (BAUD_ERROR>1010))
#error Baud to high
#endif
#define UART_MAX_STRING_LENGHT 20 // Max lenght
//////////////////////////////////////////////////////////////////////////
// UART-Receive-Variables
//////////////////////////////////////////////////////////////////////////
volatile uint8_t uart_str_complete = 0; // FLAG - String received
volatile uint8_t uart_str_count = 0; // Current position
volatile char uart_string[UART_MAX_STRING_LENGHT + 1] = ""; // received string
//////////////////////////////////////////////////////////////////////////
// ISR-UART
//////////////////////////////////////////////////////////////////////////
ISR(USART_RXC_vect)
{
unsigned char nextChar;
nextChar = UDR; // read data from buffer
if(uart_str_complete == 0) // UART-String is currently usen
{
if(nextChar != '\n' && nextChar != '\r' && uart_str_count < UART_MAX_STRING_LENGHT)
{
uart_string[uart_str_count] = nextChar;
uart_str_count++;
}
else
{
uart_string[uart_str_count] = '\0';
uart_str_count = 0;
uart_str_complete = 1;
}
}
}
//////////////////////////////////////////////////////////////////////////
// Init UART
//////////////////////////////////////////////////////////////////////////
void Init_UART_Async()
{
UBRRH = UBRR_VAL >> 8;
UBRRL = UBRR_VAL & 0xFF;
UCSRB |= (1<<TXEN); // UART TX high
UCSRB |= (1<<RXEN); // UART RX high
UCSRB |= (1<<RXCIE); // UART RX Interrupt enable
UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0); // Asynchron 8N1
sei(); // Enable interrups
}
//////////////////////////////////////////////////////////////////////////
// Main
//////////////////////////////////////////////////////////////////////////
int main(void)
{
Init_UART_Async();
while(1)
{
HandleCommunication(); // <-- Handle your communication ;-)
// and to some other cool stuff here
}
}
//////////////////////////////////////////////////////////////////////////
// Handle Communication
//////////////////////////////////////////////////////////////////////////
void HandleCommunication()
{
if(uart_str_complete == 1)
{
strcpy(received_string, uart_string); // copy received string
strcpy(uart_string, ""); // empty uart-string
uart_str_complete = 0; // set flag to 0
// handle your communication
}
}
在了解UART的工作原理后，您应该检查您的代码部分 比如“scanf（”％s“，＆amp; cmd）;”在控制台应用程序中 - 更容易发现一些错误。
我希望这对你有所帮助，但我想最好的解决方案就是当你知道自己在做什么时。
-Crazy