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/*
* This file is part of the libusbhost library
* hosted at http://github.com/libusbhost/libusbhost
*
* Copyright (C) 2015 Amir Hammad <amir.hammad@hotmail.com>
*
*
* libusbhost is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef USBH_USART_HELPERS_H
#define USBH_USART_HELPERS_H
#include "usbh_core.h"
#include <stdint.h>
#include <stdarg.h>
#include <errno.h>
BEGIN_DECLS
struct dma_buf {
uint32_t xfr_start; /* Start index of running DMA transfer */
uint32_t xfr_end; /* End index of running DMA transfer plus one */
uint32_t wr_pos; /* Next index to be written */
uint32_t len;
uint8_t data[0];
};
struct dma_usart_file {
uint32_t usart;
uint32_t baudrate;
uint32_t dma;
uint8_t stream;
uint8_t channel;
uint8_t irqn;
volatile struct dma_buf *buf;
};
extern struct dma_usart_file *debug_out;
void usart_init(uint32_t usart, uint32_t baudrate);
void usart_fprintf(struct dma_usart_file *f, const char *str, ...);
void usart_fifo_push(uint8_t c);
void usart_dma_init(struct dma_usart_file *f);
void usart_kickoff_dma(uint32_t dma, uint8_t stream, volatile uint8_t *buf, size_t len);
void schedule_dma(volatile struct dma_usart_file *f);
int dma_fifo_push(volatile struct dma_buf *buf, char c);
int putf(void *file, char c);
int putb(void *file, const uint8_t *buf, size_t len);
void flush(void *file);
/* This macro abomination templates a bunch of dma-specific register/constant names from preprocessor macros passed in
* from cmake. */
#define DMA_PASTE(num) DMA ## num
#define DMA(num) DMA_PASTE(num)
#define NVIC_DMA_IRQ_PASTE(dma, stream) NVIC_ ## DMA ## dma ## _ ## STREAM ## stream ## _IRQ
#define NVIC_DMA_IRQ(dma, stream) NVIC_DMA_IRQ_PASTE(dma, stream)
#define DMA_ISR_PASTE(dma, stream) DMA ## dma ## _ ## STREAM ## stream ## _IRQHandler
#define DMA_ISR(dma, stream) DMA_ISR_PASTE(dma, stream)
#ifdef USART_DEBUG
#define LOG_PRINTF(format, ...) usart_fprintf(debug_out, format, ##__VA_ARGS__);
#else
#define LOG_PRINTF(dummy, ...) ((void)dummy)
#endif
#define UNUSED(var) ((void)var)
END_DECLS
#endif
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