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tsoftuart: add a softare timer base UART driver, and example.

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Our Air Quality 2019-04-11 23:13:25 +10:00
parent 05da9151ee
commit 5ab0d05768
8 changed files with 349 additions and 0 deletions
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extras/tsoftuart/tsoftuart.h Normal file
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/*
* Software timer based UART driver.
*
* Copyright (C) 2018 to 2019 OurAirQuality.org
*
* Licensed under the Apache License, Version 2.0, January 2004 (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/
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS WITH THE SOFTWARE.
*
*/
#ifndef _TSOFTUART_H
#define _TSOFTUART_H
#include "mactimer/mactimer.h"
typedef struct tsoftuart {
uint32_t tx_pin;
/* Bit time period in usec * 256 */
uint32_t td;
mactimer_t output_mactimer;
uint32_t output_queue[16];
volatile uint64_t output_start_time;
volatile size_t output_queue_head;
volatile size_t output_queue_tail;
size_t output_queue_state;
uint64_t output_expected_time;
int32_t output_queue_error_high;
int32_t output_queue_error_low;
uint32_t output_done;
} tsoftuart_t;
void tsoftuart_putc(tsoftuart_t *uart, uint8_t ch);
ssize_t tsoftuart_write(tsoftuart_t *uart, const void *ptr, size_t len);
tsoftuart_t *tsoftuart_init(uint8_t tx_pin, uint32_t baud_rate);
#endif /* _TSOFTUART_H */