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Change the triple buffer object interface

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This commit is contained in:
Fred Sundvik 2016-02-21 18:30:04 +02:00
parent 679bfe7c54
commit 2710361cd8
3 changed files with 49 additions and 78 deletions
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34
serial_link/protocol/triple_buffered_object.c
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@ -43,7 +43,7 @@ void triple_buffer_init(triple_buffer_object_t* object) {
SET_DATA_AVAILABLE(0);
}
static bool triple_buffer_begin_read(uint16_t object_size, triple_buffer_object_t* object) {
void* triple_buffer_read_internal(uint16_t object_size, triple_buffer_object_t* object) {
serial_link_lock();
if (GET_DATA_AVAILABLE()) {
uint8_t shared_index = GET_SHARED_INDEX();
@ -52,41 +52,25 @@ static bool triple_buffer_begin_read(uint16_t object_size, triple_buffer_object_
SET_SHARED_INDEX(read_index);
SET_DATA_AVAILABLE(false);
serial_link_unlock();
return true;
return object->buffer + object_size * shared_index;
}
else {
serial_link_unlock();
return false;
return NULL;
}
}
static void triple_buffer_actual_read(uint16_t object_size, triple_buffer_object_t* object, void* dst) {
uint8_t read_index = GET_READ_INDEX();
memcpy(dst, object->buffer + object_size*read_index, object_size);
}
static void triple_buffer_end_read(uint16_t object_size, triple_buffer_object_t* object) {
}
void triple_buffer_write(uint16_t object_size, triple_buffer_object_t* object, void* src) {
void* triple_buffer_begin_write_internal(uint16_t object_size, triple_buffer_object_t* object) {
uint8_t write_index = GET_WRITE_INDEX();
memcpy(object->buffer + object_size * write_index, src, object_size);
return object->buffer + object_size * write_index;
}
void triple_buffer_end_write_internal(triple_buffer_object_t* object) {
serial_link_lock();
uint8_t shared_index = GET_SHARED_INDEX();
uint8_t write_index = GET_WRITE_INDEX();
SET_SHARED_INDEX(write_index);
SET_WRITE_INDEX(shared_index);
SET_DATA_AVAILABLE(true);
serial_link_unlock();
}
bool triple_buffer_read(uint16_t object_size, triple_buffer_object_t* object, void* dst) {
if (triple_buffer_begin_read(object_size, object)) {
triple_buffer_actual_read(object_size, object, dst);
triple_buffer_end_read(object_size, object);
return true;
}
else {
return false;
}
}