Problem with comparison.
/Modules/H_Bridge/HBSTEP01A/SW/Wiring/speed_control.pde
0,0 → 1,81
#include <SPI.h>
 
void command(char* buffer, unsigned int len)
{
for (int i = 0; i < len; i++) {
delay(10);
digitalWrite(SS, 0);
SPI.transfer(buffer[i]);
digitalWrite(SS, 1);
}
}
 
void goTo(unsigned int pos)
{
char buffer[4];
buffer[0] = 0x60;
buffer[1] = pos >> 16;
buffer[2] = (pos >> 8) & 0xff;
buffer[3] = pos & 0xff;
command(buffer, 4);
}
 
void setParam(unsigned int reg, unsigned int val, unsigned int len)
{
char buffer[4];
buffer[0] = reg;
/* BUG: reg? */
for (int i = 0; i < len; i++)
buffer[i + 1] = (reg >> (8 * ((len - 1) - i))) & 0xff;
command(buffer, 1 + len);
}
 
void setup()
{
Serial.begin(9600);
SPI.begin(SPI_MASTER, MSBFIRST, SPI_MODE3, SPI_CLOCK_DIV32);
setParam(5, 0xd0, 2); // ACC
setParam(6, 0xd0, 2); // DEC
setParam(7, 0, 2); // MAX_SPEED
}
 
int readInt()
{
char line[100];
int i = 0;
while (true) {
if (Serial.available()) {
byte c = Serial.read();
if (c == '\n' || c == '\r') {
Serial.println();
line[i] = '\0';
return atoi(line);
}
Serial.write(c);
line[i++] = c;
}
}
}
 
void loop()
{
int speed = readInt();
 
int dir = speed > 0;
if (!dir)
speed = -speed;
char buffer[4];
buffer[0] = 0x50 | dir;
buffer[1] = (speed >> 16) & 0xff;
buffer[2] = (speed >> 8) & 0xff;
buffer[3] = speed & 0xff;
command(buffer, 4);
}