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USB @F042 receive/send in IRQ, circular buffers

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This commit is contained in:
Edward Emelianov
2022-10-27 11:58:56 +03:00
parent c0fd4fb10a
commit 1dc60d18b5
4 changed files with 25 additions and 11 deletions
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27
F0:F030,F042,F072/PL2303_ringbuffer/usb.c
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@@ -16,7 +16,15 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// USB read/write for text or binary data through ring-buffers (mean 5187476b/s)
// USB read/write for text or binary data through ring-buffers
/*
* mean speeds (bit/s) @ buffer size (bytes):
5333333 @ 128
5249343 @ 256
5181347 @ 512
5277044 @ 2048
5434782 @ 4096
*/
#include "ringbuffer.h"
#include "usb.h"
@@ -28,27 +36,26 @@ static uint8_t obuf[RBOUTSZ], ibuf[RBINSZ];
static ringbuffer out = {.data = obuf, .length = RBOUTSZ, .head = 0, .tail = 0};
static ringbuffer in = {.data = ibuf, .length = RBINSZ, .head = 0, .tail = 0};
// transmission is succesfull
static volatile uint8_t tx_succesfull = 1;
static volatile uint8_t bufisempty = 1;
static volatile uint8_t bufovrfl = 0;
static void send_next(){
if(!tx_succesfull) return;
if(bufisempty) return;
static int lastdsz = 0;
int buflen = RB_read(&out, usbbuff, USB_TXBUFSZ);
if(!buflen){
if(lastdsz == 64) EP_Write(3, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
lastdsz = 0;
bufisempty = 1;
return;
}
tx_succesfull = 0;
EP_Write(3, usbbuff, buflen);
lastdsz = buflen;
}
// send full content of ring buffer
int USB_sendall(){
while(RB_datalen(&out)){
send_next();
while(!bufisempty){
if(!usbON) return 0;
}
return 1;
@@ -58,10 +65,13 @@ int USB_sendall(){
int USB_send(const uint8_t *buf, int len){
if(!buf || !usbON || !len) return 0;
while(len){
if(tx_succesfull) send_next();
int a = RB_write(&out, buf, len);
len -= a;
buf += a;
if(bufisempty){
bufisempty = 0;
send_next();
}
}
return 1;
}
@@ -119,10 +129,10 @@ static void EP1_Handler(){
// data IN/OUT handlers
static void transmit_Handler(){ // EP3IN
tx_succesfull = 1;
uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[3]);
// clear CTR keep DTOGs & STATs
USB->EPnR[3] = (epstatus & ~(USB_EPnR_CTR_TX)); // clear TX ctr
send_next();
}
static void receive_Handler(){ // EP2OUT
@@ -153,6 +163,5 @@ void USB_proc(){
break;
default: // USB_STATE_CONNECTED - send next data portion
if(!usbON) return;
if(tx_succesfull) send_next();
}
}