![]() ![]() Initially, the example was not working directly but I read somewhere in the form that it needs to increase the I2C buffer size as the received packet size from the sensor is big therefore default size will not work.įirst I tested it by changing the I2C_BUFFER_LENGTH to 256 directly in the Wire.h file and the example code is working perfectly. To be specific inside the Wire.h file of the ESP32 package. I am using this library and its example for testing and it works perfectly but I need to change inside the ESP32 package to make it work. I am using a vl53l3cx TOF sensor with an ESP32 board. If interrupts are turned off this will never happen, thus you do not do Serial prints inside an Interrupt Service Routine.Using generic ESP32 dev board Hardware Configuration In the case of sending if the buffer fills up the code "blocks" waiting for an interrupt to send the next byte out the serial port. ![]() You can see from the #if (RAMEND < 1000) check that the processors with 1000+ bytes of RAM get the 64-byte buffer, the ones will less RAM get the 16-byte buffer.ĭata that you write is placed in a same-sized buffer (16 or 64 bytes). All you really have to do is move the data from the HardwareSerial buffer to your own, if you don't want to process it right now. On a 16 MHz processor you should be able to check the buffer often enough that it doesn't fill up. However with a 64-byte buffer, and receiving data at (say) 9600 baud, you get one byte every 1.04 ms, and thus it takes 66.6 ms to fill up the buffer. There is no software or hardware flow control, unless you implement your own. I get the impression that if I transmit data to the Arduino and don't have an active "puller" of data on the Arduino side then if more data arrives than can fit in the buffer, it will be discarded. and so we don't write the character or advance the head. current location of the tail), we're about to overflow the buffer just before the tail (meaning that the head would advance to the if we should be storing the received character into the location Int i = (unsigned int)(buffer->head + 1) % SERIAL_BUFFER_SIZE ![]() You can see from the source of HardwareSerial that if an incoming byte finds the ring buffer full it is discarded: inline void store_char(unsigned char c, ring_buffer *buffer) ![]()
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