mirror of
https://github.com/eddyem/stm32samples.git
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127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
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* This file is part of the pl2303 project.
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* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "hardware.h"
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#include "usb.h"
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#include "usb_lib.h"
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static volatile uint8_t usbbuff[USB_TXBUFSZ]; // temporary buffer for sending data
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// ring buffers for incoming and outgoing data
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static uint8_t obuf[RBOUTSZ], ibuf[RBINSZ];
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volatile ringbuffer rbout = {.data = obuf, .length = RBOUTSZ, .head = 0, .tail = 0};
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volatile ringbuffer rbin = {.data = ibuf, .length = RBINSZ, .head = 0, .tail = 0};
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// transmission is succesfull
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volatile uint8_t bufisempty = 1;
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volatile uint8_t bufovrfl = 0;
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void send_next(){
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if(bufisempty) return;
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static int lastdsz = 0;
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int buflen = RB_read((ringbuffer*)&rbout, (uint8_t*)usbbuff, USB_TXBUFSZ);
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if(!buflen){
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if(lastdsz == 64) EP_Write(3, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
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lastdsz = 0;
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bufisempty = 1;
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return;
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}
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EP_Write(3, (uint8_t*)usbbuff, buflen);
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lastdsz = buflen;
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}
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// blocking send full content of ring buffer
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int USB_sendall(){
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while(!bufisempty){
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if(!usbON) return 0;
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}
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return 1;
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}
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// put `buf` into queue to send
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int USB_send(const uint8_t *buf, int len){
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if(!buf || !usbON || !len) return 0;
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while(len){
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int a = RB_write((ringbuffer*)&rbout, buf, len);
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len -= a;
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buf += a;
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if(bufisempty){
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bufisempty = 0;
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send_next();
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}
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}
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return 1;
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}
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int USB_putbyte(uint8_t byte){
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if(!usbON) return 0;
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while(0 == RB_write((ringbuffer*)&rbout, &byte, 1)){
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if(bufisempty){
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bufisempty = 0;
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send_next();
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}
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}
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return 1;
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}
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int USB_sendstr(const char *string){
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if(!string || !usbON) return 0;
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int len = 0;
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const char *b = string;
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while(*b++) ++len;
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if(!len) return 0;
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return USB_send((const uint8_t*)string, len);
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}
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/**
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* @brief USB_receive - get binary data from receiving ring-buffer
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* @param buf (i) - buffer for received data
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* @param len - length of `buf`
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* @return amount of received bytes (negative, if overfull happened)
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*/
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int USB_receive(uint8_t *buf, int len){
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int sz = RB_read((ringbuffer*)&rbin, buf, len);
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if(bufovrfl){
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RB_clearbuf((ringbuffer*)&rbin);
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if(!sz) sz = -1;
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else sz = -sz;
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bufovrfl = 0;
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}
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return sz;
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}
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/**
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* @brief USB_receivestr - get string up to '\n' and replace '\n' with 0
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* @param buf - receiving buffer
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* @param len - its length
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* @return strlen or negative value indicating overflow (if so, string won't be ends with 0 and buffer should be cleared)
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*/
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int USB_receivestr(char *buf, int len){
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int l = RB_readto((ringbuffer*)&rbin, '\n', (uint8_t*)buf, len);
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if(l == 0) return 0;
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if(--l < 0 || bufovrfl) RB_clearbuf((ringbuffer*)&rbin);
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else buf[l] = 0; // replace '\n' with strend
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if(bufovrfl){
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if(l > 0) l = -l;
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else l = -1;
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bufovrfl = 0;
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}
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return l;
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}
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