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Add FIFO copy modes: tu_fifo_copy_mode_t

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Allows to copy from/to constant pointers required for STM32 hardware
FIFO copies.
This commit is contained in:
Reinhard Panhuber
2021-01-18 17:12:39 +01:00
parent 84c383061f
commit 8450bc3225
2 changed files with 127 additions and 6 deletions
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30
src/common/tusb_fifo.h
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@@ -55,6 +55,19 @@ extern "C" {
#define tu_fifo_mutex_t osal_mutex_t
#endif
/** \enum tu_fifo_copy_mode_t
* \brief Write modes intended to allow special read and write functions to be able to copy data to and from USB hardware FIFOs as needed for e.g. STM32s
*/
typedef enum
{
TU_FIFO_COPY_INC, ///< Copy from/to an increasing source/destination address - default mode
TU_FIFO_COPY_CST, ///< Copy from/to a constant source/destination address - required for e.g. STM32 to write into USB hardware FIFO
} tu_fifo_copy_mode_t;
//TU_FIFO_WRITE_INC_DST, ///< Write to an increasing destination address - default mode
// TU_FIFO_WRITE_CONST_DST, ///< Write to a constant destination address - required for e.g. STM32 to write into USB hardware FIFO
// TU_FIFO_READ_INC_SRC, ///< Read from an increasing source address - default mode
// TU_FIFO_READ_CONST_SRC, ///< Read from a constant source address - required for e.g. STM32 to read from USB hardware FIFO
/** \struct tu_fifo_t
* \brief Simple Circular FIFO
@@ -72,6 +85,9 @@ typedef struct
volatile uint16_t wr_idx ; ///< write pointer
volatile uint16_t rd_idx ; ///< read pointer
tu_fifo_copy_mode_t wr_mode ; ///< write mode - default is TU_FIFO_COPY_INC
tu_fifo_copy_mode_t rd_mode ; ///< read mode - default is TU_FIFO_COPY_INC
#if CFG_FIFO_MUTEX
tu_fifo_mutex_t mutex;
#endif
@@ -87,6 +103,8 @@ typedef struct
.overwritable = _overwritable, \
.max_pointer_idx = 2*_depth-1, \
.non_used_index_space = 0xFFFF - 2*_depth-1, \
.wr_mode = TU_FIFO_COPY_INC, \
.rd_mode = TU_FIFO_COPY_INC, \
}
bool tu_fifo_set_overwritable(tu_fifo_t *f, bool overwritable);
@@ -133,6 +151,18 @@ static inline uint16_t tu_fifo_depth(tu_fifo_t* f)
return f->depth;
}
// When writing into the FIFO by fifo_write_n(), rd_mode determines how the pointer read from is modified
static inline void tu_fifo_set_copy_mode_read(tu_fifo_t* f, tu_fifo_copy_mode_t rd_mode)
{
f->rd_mode = rd_mode;
}
// When reading from the FIFO by fifo_read_n() or fifo_peek_n(), wr_mode determines how the pointer written to is modified
static inline void tu_fifo_set_copy_mode_write(tu_fifo_t* f, tu_fifo_copy_mode_t wr_mode)
{
f->wr_mode = wr_mode;
}
#ifdef __cplusplus
}
#endif