Communication between UART DMA and ESP8266 hangs after first response Posted on May 26, 2018 at 16:04I'm going crazy with this. I want to send some commands to an ESP8266, and search the response for 'OK'. Since the response is of arbitrary length, I'm receiving 400 bytes, and see if there's an 'OK' in there. If there isn't within a given timeout, the operation fails.clearBuffer(buffer);HAL_UART_Receive_DMA(&huart7, rxbuffer, 400);HAL_UART_Transmit_DMA(&huart7, 'OK' CRLF, 4);buf = waitOK(buffer, 3); // wait 3 secs for 'OK'HAL_UART_Transmit_DMA(&huart7, 'OK' CRLF, 4);buf = waitOK(buf, 3); // wait 3 secs for 'OK'// ...static uint8_t *waitOK(uint8_t *buf, int timeout) { uint8_t *found = 0; int count = 0; while (count++ < 2 * timeout) { found = strfind(buf, 'OK'); // search for 'OK' in remaining buffer if (found) break; HAL_Delay(500); } return found + 1;}Unfortunately, I can only get the first OK. Subsequent commands don't re
