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OK, I2C read by DMA works

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This commit is contained in:
Edward Emelianov
2025-09-19 21:24:19 +03:00
parent 934f4fbddd
commit 080be6a1ec
8 changed files with 103 additions and 109 deletions
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13
F3:F303/I2C_scan/ringbuffer.c
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@@ -15,6 +15,8 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "ringbuffer.h"
static int datalen(ringbuffer *b){
@@ -58,10 +60,11 @@ int RB_hasbyte(ringbuffer *b, uint8_t byte){
return ret;
}
/*
// poor memcpy
static void mcpy(uint8_t *targ, const uint8_t *src, int l){
while(l--) *targ++ = *src++;
}
}*/
// increment head or tail
TRUE_INLINE void incr(ringbuffer *b, volatile int *what, int n){
@@ -76,9 +79,9 @@ static int read(ringbuffer *b, uint8_t *s, int len){
int _1st = b->length - b->head;
if(_1st > l) _1st = l;
if(_1st > len) _1st = len;
mcpy(s, b->data + b->head, _1st);
memcpy(s, b->data + b->head, _1st);
if(_1st < len && l > _1st){
mcpy(s+_1st, b->data, l - _1st);
memcpy(s+_1st, b->data, l - _1st);
incr(b, &b->head, l);
return l;
}
@@ -132,9 +135,9 @@ static int write(ringbuffer *b, const uint8_t *str, int l){
if(l > r || !l) return 0;
int _1st = b->length - b->tail;
if(_1st > l) _1st = l;
mcpy(b->data + b->tail, str, _1st);
memcpy(b->data + b->tail, str, _1st);
if(_1st < l){ // add another piece from start
mcpy(b->data, str+_1st, l-_1st);
memcpy(b->data, str+_1st, l-_1st);
}
incr(b, &b->tail, l);
return l;