Hi, I'm reading data from UART 1, doing some processing on it, then logging the result to console which is on the default UART 0. The program is extremely unstable when I'm printing to console using either printf() or ESP_LOGI(), but is completely stable when these lines are commented out. The error...

Thanks for the reply, I misread the documents so I've changed it to: uint8_t *writeBuf = (uint8_t *)"$PMTK220,10000*2F\r\n"; uart_write_bytes(UART_NUM_1, (const char *)writeBuf, 128); This didn't work at first, but when I moved the uart_write_bytes() call further down the program after I'd read a fe...

I'm using an MTK3339 GPS module with UART1 in pins 16 (RX) & 17 (TX). I can read data coming from the GPS module with uart_read_bytes() on UART1, but I can't get uart_write_bytes() working to send commands to the module (see: https://cdn-shop.adafruit.com/datasheets/PMTK_A11.pdf ). I've tried sendin...