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https://github.com/espressif/ESP8266_RTOS_SDK.git
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34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
// Copyright 2019-2020 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 "rom/uart.h"
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void uart_tx_wait_idle(uint8_t uart_no)
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{
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uint32_t tx_bytes;
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uint32_t baudrate, byte_delay_us;
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uart_dev_t *const UART[2] = {&uart0, &uart1};
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uart_dev_t *const uart = UART[uart_no];
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baudrate = (UART_CLK_FREQ / (uart->clk_div.val & 0xFFFFF));
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byte_delay_us = (uint32_t)(10000000 / baudrate);
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do {
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tx_bytes = uart->status.txfifo_cnt;
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/* either tx count or state is non-zero */
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} while (tx_bytes);
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ets_delay_us(byte_delay_us);
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}
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