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add F103 PL2303 with ring buffer

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Edward Emelianov
2022-05-28 23:23:19 +03:00
parent 5265b98bac
commit 80726e1c2b
18 changed files with 1891 additions and 0 deletions
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110
F1:F103/PL2303_ringbuffer/usb.c Normal file
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/*
* This file is part of the MLX90640 project.
* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ringbuffer.h"
#include "usb.h"
#include "usb_lib.h"
static char usbbuff[USB_TXBUFSZ]; // temporary buffer for sending data
volatile uint8_t tx_succesfull = 1;
static volatile uint8_t rxNE = 0;
void send_next(){
//if(!tx_succesfull) return;
static int lastdsz = 0;
int buflen = RB_read(usbbuff);
if(!buflen){
if(lastdsz == 64) EP_Write(3, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
lastdsz = 0;
return;
}
tx_succesfull = 0;
EP_Write(3, (uint8_t*)usbbuff, buflen);
lastdsz = buflen;
}
// put `buf` into queue to send
void USB_send(const char *buf){
if(!buf) return;
int len = 0;
const char *b = buf;
while(*b++) ++len;
if(!usbON || !len) return;
RB_write(buf, len); // this is a blocking procedure if there's too little free memory in buffer
}
// interrupt IN handler (never used?)
static void EP1_Handler(){
uint16_t epstatus = KEEP_DTOG(USB->EPnR[1]);
if(RX_FLAG(epstatus)) epstatus = (epstatus & ~USB_EPnR_STAT_TX) ^ USB_EPnR_STAT_RX; // set valid RX
else epstatus = epstatus & ~(USB_EPnR_STAT_TX|USB_EPnR_STAT_RX);
// clear CTR
epstatus = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX));
USB->EPnR[1] = epstatus;
}
// 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
}
static void receive_Handler(){ // EP2OUT
rxNE = 1;
uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[2]);
USB->EPnR[2] = (epstatus & ~(USB_EPnR_CTR_RX)); // clear RX ctr
}
void usb_proc(){
switch(USB_Dev.USB_Status){
case USB_STATE_CONFIGURED:
// make new BULK endpoint
// Buffer have 1024 bytes, but last 256 we use for CAN bus (30.2 of RM: USB main features)
EP_Init(1, EP_TYPE_INTERRUPT, USB_EP1BUFSZ, 0, EP1_Handler); // IN1 - transmit
EP_Init(2, EP_TYPE_BULK, 0, USB_RXBUFSZ, receive_Handler); // OUT2 - receive data
EP_Init(3, EP_TYPE_BULK, USB_TXBUFSZ, 0, transmit_Handler); // IN3 - transmit data
USB_Dev.USB_Status = USB_STATE_CONNECTED;
break;
case USB_STATE_DEFAULT:
case USB_STATE_ADDRESSED:
if(usbON){
usbON = 0;
}
break;
default: // USB_STATE_CONNECTED - send next data portion
if(!usbON) return;
if(tx_succesfull) send_next();
}
}
/**
* @brief USB_receive
* @param buf (i) - buffer[64] for received data
* @return amount of received bytes
*/
uint8_t USB_receive(char *buf){
if(!usbON || !rxNE) return 0;
uint8_t sz = EP_Read(2, (uint16_t*)buf);
uint16_t epstatus = KEEP_DTOG(USB->EPnR[2]);
// keep stat_tx & set ACK rx
USB->EPnR[2] = (epstatus & ~(USB_EPnR_STAT_TX)) ^ USB_EPnR_STAT_RX;
rxNE = 0;
return sz;
}