eddy/stm32samples
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Seems like all U[S]ARTs works well. Tested on speeds up to 2Mbaud (as CH340 can).

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This commit is contained in:
Edward Emelianov
2026-02-17 23:37:17 +03:00
parent fb570367fa
commit 68028f42a3
13 changed files with 104 additions and 64 deletions
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48
F3:F303/InterfaceBoard/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){
@@ -24,7 +26,7 @@ static int datalen(ringbuffer *b){
// stored data length
int RB_datalen(ringbuffer *b){
if(b->busy) return -1;
if(!b || b->busy) return -1;
b->busy = 1;
int l = datalen(b);
b->busy = 0;
@@ -32,7 +34,7 @@ int RB_datalen(ringbuffer *b){
}
static int hasbyte(ringbuffer *b, uint8_t byte){
if(b->head == b->tail) return -1; // no data in buffer
if(!b || b->head == b->tail) return -1; // no data in buffer
int startidx = b->head;
if(b->head > b->tail){ //
for(int found = b->head; found < b->length; ++found)
@@ -51,18 +53,13 @@ static int hasbyte(ringbuffer *b, uint8_t byte){
* @return index if found, -1 if none or busy
*/
int RB_hasbyte(ringbuffer *b, uint8_t byte){
if(b->busy) return -1;
if(!b || b->busy) return -1;
b->busy = 1;
int ret = hasbyte(b, byte);
b->busy = 0;
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){
*what += n;
@@ -76,9 +73,9 @@ 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;
}
@@ -94,20 +91,27 @@ static int read(ringbuffer *b, uint8_t *s, int len){
* @return bytes read or -1 if busy
*/
int RB_read(ringbuffer *b, uint8_t *s, int len){
if(b->busy) return -1;
if(!b || b->busy || !s || len < 1) return -1;
b->busy = 1;
int r = read(b, s, len);
b->busy = 0;
return r;
}
static int readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
// length of data from current position to `byte` (including byte)
static int lento(ringbuffer *b, uint8_t byte){
int idx = hasbyte(b, byte);
if(idx < 0) return 0;
int partlen = idx + 1 - b->head;
// now calculate length of new data portion
if(idx < b->head) partlen += b->length;
if(partlen > len) return -read(b, s, len);
return partlen;
}
static int readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
int partlen = lento(b, byte);
if(!partlen) return 0;
if(partlen > len) return -1;
return read(b, s, partlen);
}
@@ -120,21 +124,29 @@ static int readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
* @return amount of bytes written (negative, if len<data in buffer or buffer is busy)
*/
int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
if(b->busy) return -1;
if(!b || b->busy || !s || len < 1) return -1;
b->busy = 1;
int n = readto(b, byte, s, len);
b->busy = 0;
return n;
}
int RB_datalento(ringbuffer *b, uint8_t byte){
if(!b || b->busy) return -1;
b->busy = 1;
int n = lento(b, byte);
b->busy = 0;
return n;
}
static int write(ringbuffer *b, const uint8_t *str, int l){
int r = b->length - 1 - datalen(b); // rest length
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;
@@ -148,7 +160,7 @@ static int write(ringbuffer *b, const uint8_t *str, int l){
* @return amount of bytes written or -1 if busy
*/
int RB_write(ringbuffer *b, const uint8_t *str, int l){
if(b->busy) return -1;
if(!b || b->busy || !str || l < 1) return -1;
b->busy = 1;
int w = write(b, str, l);
b->busy = 0;
@@ -157,7 +169,7 @@ int RB_write(ringbuffer *b, const uint8_t *str, int l){
// just delete all information in buffer `b`
int RB_clearbuf(ringbuffer *b){
if(b->busy) return -1;
if(!b || b->busy) return -1;
b->busy = 1;
b->head = 0;
b->tail = 0;