// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #include #include #include "esp_attr.h" #include "esp8266/eagle_soc.h" #include "esp8266/uart_register.h" #include "esp8266/rom_functions.h" static void IRAM_ATTR uart_tx_one_char(char c) { while (1) { uint32_t fifo_cnt = READ_PERI_REG(UART_STATUS(0)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S); if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126) break; } WRITE_PERI_REG(UART_FIFO(0) , c); } /* Re-write ets_printf in SDK side, since ets_printf in ROM will use a global * variable which address is in heap region of SDK side. If use ets_printf in ROM, * this variable maybe re-write when heap alloc and modification.*/ int IRAM_ATTR ets_printf(const char* fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = ets_vprintf(uart_tx_one_char, fmt, ap); va_end(ap); return ret; }