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https://github.com/cesanta/mongoose.git
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Deomid Ryabkov
0b2e474d52
Use old baud rate and autodetected divider to calculate new divider. This works better with higher baud rates and drifting clocks. CL: mos: Improve ESP flasher baud rate setting PUBLISHED_FROM=7761e756c3ae7cc76e3b9a4fe3e40d06a779b2e8
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
/*
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* Copyright (c) 2014-2018 Cesanta Software Limited
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* All rights reserved
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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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*/
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#include "uart.h"
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#include "rom_functions.h"
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uint32_t set_baud_rate(uint32_t uart_no, uint32_t old_baud_rate,
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uint32_t new_baud_rate) {
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uint32_t uart_reg = REG_READ(UART_CLKDIV_REG(uart_no));
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uint32_t uart_div = uart_reg & UART_CLKDIV_M;
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uint32_t fraction = (uart_reg >> UART_CLKDIV_FRAG_S) & UART_CLKDIV_FRAG_V;
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uart_div = (uart_div << 4) + fraction;
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uint32_t master_freq = uart_div * old_baud_rate;
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uart_div_modify(uart_no, master_freq / new_baud_rate);
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return uart_div;
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}
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