105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
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/*
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* ftdicom.c - Low Level USB communication interface
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*
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* Provides UART and DMA low level communication
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* functions for FT2232H in slave fifo mode.
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*
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* Copyright (C) 2014 florent@enjoy-digital.fr
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*
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*/
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#ifndef __FTDICOM_H
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#define __FTDICOM_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <pthread.h>
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#include "fastftdi.h"
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/*
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* Protocol Constants
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*/
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#define UART_TAG 0
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#define DMA_TAG 1
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#define NEEDED_FOR_SIZE 9
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#define PAYLOAD_OFFSET 10
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#define INCOMPLETE -1
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#define UNMATCHED 0
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/*
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* Buffer Constants
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*
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* Buffer sizes must be a power of 2 so that modulos can be computed
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* with logical AND.
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*/
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// RAW
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#define RAW_BUFFER_SIZE 20*1024*1024
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// UART
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#define UART_RINGBUFFER_SIZE_RX 4096
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#define UART_RINGBUFFER_MASK_RX (UART_RINGBUFFER_SIZE_RX-1)
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// DMA
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#define DMA_BUFFER_SIZE_TX 20*1024*1024
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#define DMA_BUFFER_SIZE_RX 20*1024*1024
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/*
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* Struct
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*/
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typedef int (*dma_read_ext_callback_t)(uint8_t *buffer, int length, void *userdata);
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typedef struct {
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FTDIDevice *dev;
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uint8_t *raw_tx_buf;
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uint8_t *raw_rx_buf;
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unsigned int raw_rx_buf_length;
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char *uart_rx_buf;
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volatile unsigned int uart_rx_produce;
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volatile unsigned int uart_rx_consume;
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pthread_t *thread;
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dma_read_ext_callback_t dma_read_ext_callback;
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void *userdata;
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} FTDICom;
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/*
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* Public Functions
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*/
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int ftdicom_open(FTDICom *com);
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void ftdicom_close(FTDICom *com);
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int ftdicom_uart_write_buffer(FTDICom *com, uint8_t *data, size_t length);
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int ftdicom_uart_write(FTDICom *com, uint8_t c);
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uint8_t ftdicom_uart_read(FTDICom *com);
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int ftdicom_uart_read_nonblock(FTDICom *com);
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int ftdicom_dma_write(FTDICom *com, uint8_t *data, size_t length);
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void ftdicom_dma_read_set_callback(FTDICom *com, dma_read_ext_callback_t callback, void *userdata);
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/*
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* Private Functions
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*/
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int ftdicom_write(FTDICom *com, uint8_t tag, uint8_t *data, size_t length, uint8_t with_crc);
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int ftdicom_present_bytes(uint8_t tag, uint8_t *buffer, int length);
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int ftdicom_uart_present_bytes(uint8_t *buffer, int length);
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int ftdicom_dma_present_bytes(uint8_t *buffer, int length);
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int ftdicom_read_callback(uint8_t *buffer, int length, FTDIProgressInfo *progress, void *userdata);
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void *ftdicom_read_thread(void *userdata);
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void ftdicom_uart_read_callback(FTDICom *com, uint8_t *buffer, int length);
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int ftdicom_dma_read_callback(FTDICom *com, uint8_t *buffer, int length);
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#endif /* __FTDICOM_H */
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