mirror of
https://github.com/espressif/ESP8266_RTOS_SDK.git
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50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdint.h>
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#include <stdarg.h>
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#include "esp_attr.h"
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#include "esp8266/eagle_soc.h"
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#include "esp8266/uart_register.h"
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#include "esp8266/rom_functions.h"
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static void IRAM_ATTR uart_tx_one_char(char c)
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{
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while (1) {
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uint32_t fifo_cnt = READ_PERI_REG(UART_STATUS(0)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S);
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if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126)
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break;
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}
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WRITE_PERI_REG(UART_FIFO(0) , c);
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}
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/* Re-write ets_printf in SDK side, since ets_printf in ROM will use a global
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* variable which address is in heap region of SDK side. If use ets_printf in ROM,
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* this variable maybe re-write when heap alloc and modification.*/
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int IRAM_ATTR ets_printf(const char* fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = ets_vprintf(uart_tx_one_char, fmt, ap);
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va_end(ap);
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return ret;
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}
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