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Updated ring buffer

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Updated ring buffer to match use case, one write head with negative read
index
This commit is contained in:
Hector van der Aa
2026-06-02 17:29:46 +02:00
parent e549ed9038
commit e7e436affa
3 changed files with 4 additions and 15 deletions
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1
STM32/CM7/CMakeLists.txt
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@@ -59,6 +59,7 @@ target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE
# Add sources to executable # Add sources to executable
target_sources(${CMAKE_PROJECT_NAME} PRIVATE target_sources(${CMAKE_PROJECT_NAME} PRIVATE
# Add user sources here # Add user sources here
Core/Src/ring_buffer.c
) )
# Link directories setup # Link directories setup

3
STM32/CM7/Core/Inc/ring_buffer.h
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@@ -6,9 +6,8 @@
typedef struct ring_buffer_t { typedef struct ring_buffer_t {
uint32_t buffer[256]; uint32_t buffer[256];
uint8_t w_head; uint8_t w_head;
uint8_t r_head;
} ring_buffer_t; } ring_buffer_t;
inline void ringBufferPush(ring_buffer_t *rb, uint32_t value); inline void ringBufferPush(ring_buffer_t *rb, uint32_t value);
inline int ringBufferPop(ring_buffer_t *rb, uint32_t *output); inline uint32_t ringBufferRead(ring_buffer_t *rb, uint8_t idx);

15
STM32/CM7/Core/Src/ring_buffer.c
View File

@@ -9,20 +9,9 @@
inline void ringBufferPush(ring_buffer_t *rb, uint32_t value) { inline void ringBufferPush(ring_buffer_t *rb, uint32_t value) {
rb->buffer[rb->w_head] = value; rb->buffer[rb->w_head] = value;
rb->w_head++; rb->w_head++;
if (rb->w_head == rb->r_head) {
// if write head catches up to read head, crash program as consumer task
// should keep up with write head
assert(false);
}
return; return;
} }
inline int ringBufferPop(ring_buffer_t *rb, uint32_t *output) { inline uint32_t ringBufferRead(ring_buffer_t *rb, uint8_t idx) {
if (rb->w_head == rb->r_head) { return rb->buffer[rb->w_head - 1 - idx];
// if read head is at write head, buffer is empty so nothing to pop
return 1;
}
*output = rb->buffer[rb->r_head];
rb->r_head++;
return 0;
} }