I Can't for the life of me figure this out and I have all but given up. Hardware is an official Mkr WiFi1010 and using IDE 1.8.10. I decided to post this here because at this point I am going to treat this as a hardware problem unless I can somehow prove otherwise. I am trying to interface the Arduino Mkr WiFi1010 with a 5v Serial "BusLinker" from Lobot. It is the serial interface board for Lobot (LewanSoul) Serial Servos.
I have the two connected together via a level converter (generic clone of the sparkfun).
They are using separate power supplies. For the sake of this post you can assume I have everything connected correctly (Arduino VCC to LV, Arduino GND to GND, BusLinker 5v to HV Buslinker GND to GND, TX and RX (14,13) crossed at the logic converter and all GND tied.).
I am using a very stripped down example from the sample code (See Below) and have changed everything to Serial1.
I Tried 4 different logic converters thinking the problem was there and to no avail, so then tested the logic converters and the inputs cycle when pulled to ground properly.
Next I completely removed the logic converter and tried with a voltage divider, still no dice.
I checked voltages before ever connecting the Mkr and voltage was always at VCC on the LV side of the logic converter/ voltage divider.
I even tried using the Sercom example to add another serial interface to pins 0,1 and still nothing.
The crazy thing is, that I can connect a 5v arduino to tx and rx, tie the grounds and everything works perfectly.
I can write the data to "Serial" (not Serial1) on the Mkr asnd see the same terminal output that I see on the 5v Arduino.
What am I missing here?? This is is driving me crazy. Is there some way I can confirm that my Mkr is actually outputting the Serial data?
Please tell me there is some smart person out there who ran into a similar issue and knows the fix. I literally feel like I am out of options other than going out and buying and oscilloscope to connect to the Mkr and hunt to see if the data is there.
Here's the simple sample code:
#define GET_LOW_BYTE(A) (uint8_t)((A))
//Macro function get lower 8 bits of A
#define GET_HIGH_BYTE(A) (uint8_t)((A) >> 8)
//Macro function get higher 8 bits of A
#define BYTE_TO_HW(A, B) ((((uint16_t)(A)) << 8) | (uint8_t)(B))
//Macro Function put A as higher 8 bits B as lower 8 bits which amalgamated into 16 bits integer
#define LOBOT_SERVO_FRAME_HEADER 0x55
#define LOBOT_SERVO_MOVE_TIME_WRITE 1
#define LOBOT_SERVO_MOVE_TIME_READ 2
#define LOBOT_SERVO_MOVE_TIME_WAIT_WRITE 7
#define LOBOT_SERVO_MOVE_TIME_WAIT_READ 8
#define LOBOT_SERVO_MOVE_START 11
#define LOBOT_SERVO_MOVE_STOP 12
#define LOBOT_SERVO_ID_WRITE 13
#define LOBOT_SERVO_ID_READ 14
#define LOBOT_SERVO_ANGLE_OFFSET_ADJUST 17
#define LOBOT_SERVO_ANGLE_OFFSET_WRITE 18
#define LOBOT_SERVO_ANGLE_OFFSET_READ 19
#define LOBOT_SERVO_ANGLE_LIMIT_WRITE 20
#define LOBOT_SERVO_ANGLE_LIMIT_READ 21
#define LOBOT_SERVO_VIN_LIMIT_WRITE 22
#define LOBOT_SERVO_VIN_LIMIT_READ 23
#define LOBOT_SERVO_TEMP_MAX_LIMIT_WRITE 24
#define LOBOT_SERVO_TEMP_MAX_LIMIT_READ 25
#define LOBOT_SERVO_TEMP_READ 26
#define LOBOT_SERVO_VIN_READ 27
#define LOBOT_SERVO_POS_READ 28
#define LOBOT_SERVO_OR_MOTOR_MODE_WRITE 29
#define LOBOT_SERVO_OR_MOTOR_MODE_READ 30
#define LOBOT_SERVO_LOAD_OR_UNLOAD_WRITE 31
#define LOBOT_SERVO_LOAD_OR_UNLOAD_READ 32
#define LOBOT_SERVO_LED_CTRL_WRITE 33
#define LOBOT_SERVO_LED_CTRL_READ 34
#define LOBOT_SERVO_LED_ERROR_WRITE 35
#define LOBOT_SERVO_LED_ERROR_READ 36
#define ID1 1
int step = 0;
int pos[4] = {100, 200, 300, 400};
void setup() {
// put your setup code here, to run once:
Serial1.begin(115200);
}
void loop() {
// put your main code here, to run repeatedly:
SerialServoMove(ID1, pos[step++], 500);
if (step == 4) {
step = 0;
}
delay(3000);
}
byte LobotCheckSum(byte buf[])
{
byte i;
uint16_t temp = 0;
for (i = 2; i < buf[3] + 2; i++) {
temp += buf[i];
}
temp = ~temp;
i = (byte)temp;
return i;
}
void SerialServoMove(uint8_t id, int16_t position, uint16_t time)
{
byte buf[10];
if (position < 0)
position = 0;
if (position > 1000)
position = 1000;
buf[0] = buf[1] = LOBOT_SERVO_FRAME_HEADER;
buf[2] = id;
buf[3] = 7;
buf[4] = LOBOT_SERVO_MOVE_TIME_WRITE;
buf[5] = GET_LOW_BYTE(position);
buf[6] = GET_HIGH_BYTE(position);
buf[7] = GET_LOW_BYTE(time);
buf[8] = GET_HIGH_BYTE(time);
buf[9] = LobotCheckSum(buf);
Serial1.write(buf, 10);
}
If you took a look, it is much appreciated.
Thanks!
