How to read COMM_ROTOR_POSITION through uart

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Wed, 2021-04-28 23:59

Graham Bowen-Davies

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How to read COMM_ROTOR_POSITION through uart

Hi,

I'm setting to up communication to teh VESC through an Arduino. Using SolidGeek's libraries, I have been able to send position control commands. What I need, is to read in the current position of the motor.

In order to set position, I modified the existing "setRPM" to make a "setPOS" command.

To set position, I naively tired to convert "getVescValues" to a "getVescPos", with the command value of "COMM_ROTOR_POSITION". But this does not seem to be recognized (payload size is zero).

Any pointers on how I should be going this are appreciated. I'm very new to arduino, and I have very little comfort with "C" language.

Thanks

Thu, 2021-05-13 20:35

Graham Bowen-Davies

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Nothing doing here? The following is the bit code that I attempted, but lenPayload returns zero

bool VescUart::getVescPos(void) {

	uint8_t command[1] = { COMM_ROTOR_POSITION };
	uint8_t payload[256];

	int lenSent = packSendPayload(command, 1);

	int lenPayload = receiveUartMessage(payload);
	
	Serial.println(lenPayload);

}

Graham

Wed, 2022-11-30 18:39

Gloobox

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Joined: 2019-09-22 14:42

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Hi Graham,

I have the same question than you ;), but do not have done some tests for now.

do you have solved your problem?

do you have tried to insert a delay between PackSend and UART reception?

Have a good day

Bruno

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How to read COMM_ROTOR_POSITION through uart