mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 10:45:11 +03:00
389 lines
13 KiB
C
389 lines
13 KiB
C
/*
|
|
* This file is part of the pl2303 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 <stdint.h>
|
|
#include "usb_lib.h"
|
|
|
|
ep_t endpoints[STM32ENDPOINTS];
|
|
|
|
usb_dev_t USB_Dev;
|
|
static usb_LineCoding lineCoding = {115200, 0, 0, 8};
|
|
config_pack_t setup_packet;
|
|
uint8_t ep0databuf[EP0DATABUF_SIZE];
|
|
uint8_t ep0dbuflen = 0;
|
|
|
|
usb_LineCoding getLineCoding(){return lineCoding;}
|
|
|
|
uint8_t usbON = 0; // device disconnected from terminal
|
|
|
|
// definition of parts common for USB_DeviceDescriptor & USB_DeviceQualifierDescriptor
|
|
#define bcdUSB_L 0x10
|
|
#define bcdUSB_H 0x01
|
|
#define bDeviceClass 0
|
|
#define bDeviceSubClass 0
|
|
#define bDeviceProtocol 0
|
|
#define bNumConfigurations 1
|
|
|
|
static const uint8_t USB_DeviceDescriptor[] = {
|
|
18, // bLength
|
|
0x01, // bDescriptorType - Device descriptor
|
|
bcdUSB_L, // bcdUSB_L - 1.10
|
|
bcdUSB_H, // bcdUSB_H
|
|
bDeviceClass, // bDeviceClass - USB_COMM
|
|
bDeviceSubClass, // bDeviceSubClass
|
|
bDeviceProtocol, // bDeviceProtocol
|
|
USB_EP0_BUFSZ, // bMaxPacketSize
|
|
0x7b, // idVendor_L PL2303: VID=0x067b, PID=0x2303
|
|
0x06, // idVendor_H
|
|
0x03, // idProduct_L
|
|
0x23, // idProduct_H
|
|
0x00, // bcdDevice_Ver_L
|
|
0x03, // bcdDevice_Ver_H
|
|
0x01, // iManufacturer
|
|
0x02, // iProduct
|
|
0x00, // iSerialNumber
|
|
bNumConfigurations // bNumConfigurations
|
|
};
|
|
|
|
static const uint8_t USB_DeviceQualifierDescriptor[] = {
|
|
10, //bLength
|
|
0x06, // bDescriptorType - Device qualifier
|
|
bcdUSB_L, // bcdUSB_L
|
|
bcdUSB_H, // bcdUSB_H
|
|
bDeviceClass, // bDeviceClass
|
|
bDeviceSubClass, // bDeviceSubClass
|
|
bDeviceProtocol, // bDeviceProtocol
|
|
USB_EP0_BUFSZ, // bMaxPacketSize0
|
|
bNumConfigurations, // bNumConfigurations
|
|
0x00 // Reserved
|
|
};
|
|
|
|
static const uint8_t USB_ConfigDescriptor[] = {
|
|
/*Configuration Descriptor*/
|
|
0x09, /* bLength: Configuration Descriptor size */
|
|
0x02, /* bDescriptorType: Configuration */
|
|
39, /* wTotalLength:no of returned bytes */
|
|
0x00,
|
|
0x01, /* bNumInterfaces: 1 interface */
|
|
0x01, /* bConfigurationValue: Configuration value */
|
|
0x00, /* iConfiguration: Index of string descriptor describing the configuration */
|
|
0xa0, /* bmAttributes - Bus powered, Remote wakeup */
|
|
0x32, /* MaxPower 100 mA */
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/*Interface Descriptor */
|
|
0x09, /* bLength: Interface Descriptor size */
|
|
0x04, /* bDescriptorType: Interface */
|
|
0x00, /* bInterfaceNumber: Number of Interface */
|
|
0x00, /* bAlternateSetting: Alternate setting */
|
|
0x03, /* bNumEndpoints: 3 endpoints used */
|
|
0xff, /* bInterfaceClass */
|
|
0x00, /* bInterfaceSubClass */
|
|
0x00, /* bInterfaceProtocol */
|
|
0x00, /* iInterface: */
|
|
///////////////////////////////////////////////////
|
|
/*Endpoint 1 Descriptor*/
|
|
0x07, /* bLength: Endpoint Descriptor size */
|
|
0x05, /* bDescriptorType: Endpoint */
|
|
0x81, /* bEndpointAddress IN1 */
|
|
0x03, /* bmAttributes: Interrupt */
|
|
0x0a, /* wMaxPacketSize LO: */
|
|
0x00, /* wMaxPacketSize HI: */
|
|
0x01, /* bInterval: */
|
|
|
|
/*Endpoint OUT2 Descriptor*/
|
|
0x07, /* bLength: Endpoint Descriptor size */
|
|
0x05, /* bDescriptorType: Endpoint */
|
|
0x02, /* bEndpointAddress: OUT2 */
|
|
0x02, /* bmAttributes: Bulk */
|
|
(USB_RXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
|
|
(USB_RXBUFSZ >> 8),
|
|
0x00, /* bInterval: ignore for Bulk transfer */
|
|
|
|
/*Endpoint IN3 Descriptor*/
|
|
0x07, /* bLength: Endpoint Descriptor size */
|
|
0x05, /* bDescriptorType: Endpoint */
|
|
0x83, /* bEndpointAddress IN3 */
|
|
0x02, /* bmAttributes: Bulk */
|
|
(USB_TXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
|
|
(USB_TXBUFSZ >> 8),
|
|
0x00, /* bInterval: ignore for Bulk transfer */
|
|
};
|
|
|
|
_USB_LANG_ID_(USB_StringLangDescriptor, LANG_US);
|
|
// these descriptors are not used in PL2303 emulator!
|
|
_USB_STRING_(USB_StringSerialDescriptor, u"0");
|
|
_USB_STRING_(USB_StringManufacturingDescriptor, u"Prolific Technology Inc.");
|
|
_USB_STRING_(USB_StringProdDescriptor, u"USB-Serial Controller");
|
|
|
|
/*
|
|
* default handlers
|
|
*/
|
|
// SET_LINE_CODING
|
|
void WEAK linecoding_handler(usb_LineCoding __attribute__((unused)) *lc){
|
|
}
|
|
|
|
// SET_CONTROL_LINE_STATE
|
|
void WEAK clstate_handler(uint16_t __attribute__((unused)) val){
|
|
}
|
|
|
|
// SEND_BREAK
|
|
void WEAK break_handler(){
|
|
}
|
|
|
|
// handler of vendor requests
|
|
void WEAK vendor_handler(config_pack_t *packet){
|
|
if(packet->bmRequestType & 0x80){ // read
|
|
uint8_t c;
|
|
switch(packet->wValue){
|
|
case 0x8484:
|
|
c = 2;
|
|
break;
|
|
case 0x0080:
|
|
c = 1;
|
|
break;
|
|
case 0x8686:
|
|
c = 0xaa;
|
|
break;
|
|
default:
|
|
c = 0;
|
|
}
|
|
EP_WriteIRQ(0, &c, 1);
|
|
}else{ // write ZLP
|
|
EP_WriteIRQ(0, (uint8_t *)0, 0);
|
|
}
|
|
}
|
|
|
|
static void wr0(const uint8_t *buf, uint16_t size){
|
|
if(setup_packet.wLength < size) size = setup_packet.wLength; // shortened request
|
|
if(size < endpoints[0].txbufsz){
|
|
EP_WriteIRQ(0, buf, size);
|
|
return;
|
|
}
|
|
while(size){
|
|
uint16_t l = size;
|
|
if(l > endpoints[0].txbufsz) l = endpoints[0].txbufsz;
|
|
EP_WriteIRQ(0, buf, l);
|
|
buf += l;
|
|
size -= l;
|
|
uint8_t needzlp = (l == endpoints[0].txbufsz) ? 1 : 0;
|
|
if(size || needzlp){ // send last data buffer
|
|
uint16_t status = KEEP_DTOG(USB->EPnR[0]);
|
|
// keep DTOGs, clear CTR_RX,TX, set TX VALID, leave stat_Rx
|
|
USB->EPnR[0] = (status & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX|USB_EPnR_STAT_RX))
|
|
^ USB_EPnR_STAT_TX;
|
|
uint32_t ctr = 1000000;
|
|
while(--ctr && (USB->ISTR & USB_ISTR_CTR) == 0){IWDG->KR = IWDG_REFRESH;};
|
|
if((USB->ISTR & USB_ISTR_CTR) == 0){
|
|
return;
|
|
}
|
|
if(needzlp) EP_WriteIRQ(0, (uint8_t*)0, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void get_descriptor(){
|
|
switch(setup_packet.wValue){
|
|
case DEVICE_DESCRIPTOR:
|
|
wr0(USB_DeviceDescriptor, sizeof(USB_DeviceDescriptor));
|
|
break;
|
|
case CONFIGURATION_DESCRIPTOR:
|
|
wr0(USB_ConfigDescriptor, sizeof(USB_ConfigDescriptor));
|
|
break;
|
|
case STRING_LANG_DESCRIPTOR:
|
|
wr0((const uint8_t *)&USB_StringLangDescriptor, STRING_LANG_DESCRIPTOR_SIZE_BYTE);
|
|
break;
|
|
case STRING_MAN_DESCRIPTOR:
|
|
wr0((const uint8_t *)&USB_StringManufacturingDescriptor, USB_StringManufacturingDescriptor.bLength);
|
|
break;
|
|
case STRING_PROD_DESCRIPTOR:
|
|
wr0((const uint8_t *)&USB_StringProdDescriptor, USB_StringProdDescriptor.bLength);
|
|
break;
|
|
case STRING_SN_DESCRIPTOR:
|
|
wr0((const uint8_t *)&USB_StringSerialDescriptor, USB_StringSerialDescriptor.bLength);
|
|
break;
|
|
case DEVICE_QUALIFIER_DESCRIPTOR:
|
|
wr0(USB_DeviceQualifierDescriptor, USB_DeviceQualifierDescriptor[0]);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static uint8_t configuration = 0; // reply for GET_CONFIGURATION (==1 if configured)
|
|
static inline void std_d2h_req(){
|
|
uint16_t status = 0; // bus powered
|
|
switch(setup_packet.bRequest){
|
|
case GET_DESCRIPTOR:
|
|
get_descriptor();
|
|
break;
|
|
case GET_STATUS:
|
|
EP_WriteIRQ(0, (uint8_t *)&status, 2); // send status: Bus Powered
|
|
break;
|
|
case GET_CONFIGURATION:
|
|
EP_WriteIRQ(0, &configuration, 1);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void std_h2d_req(){
|
|
switch(setup_packet.bRequest){
|
|
case SET_ADDRESS:
|
|
// new address will be assigned later - after acknowlegement or request to host
|
|
USB_Dev.USB_Addr = setup_packet.wValue;
|
|
break;
|
|
case SET_CONFIGURATION:
|
|
// Now device configured
|
|
USB_Dev.USB_Status = USB_STATE_CONFIGURED;
|
|
configuration = setup_packet.wValue;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
bmRequestType: 76543210
|
|
7 direction: 0 - host->device, 1 - device->host
|
|
65 type: 0 - standard, 1 - class, 2 - vendor
|
|
4..0 getter: 0 - device, 1 - interface, 2 - endpoint, 3 - other
|
|
*/
|
|
/**
|
|
* Endpoint0 (control) handler
|
|
*/
|
|
void EP0_Handler(){
|
|
uint16_t epstatus = USB->EPnR[0]; // EP0R on input -> return this value after modifications
|
|
uint8_t reqtype = setup_packet.bmRequestType & 0x7f;
|
|
uint8_t dev2host = (setup_packet.bmRequestType & 0x80) ? 1 : 0;
|
|
int rxflag = RX_FLAG(epstatus);
|
|
if(rxflag && SETUP_FLAG(epstatus)){
|
|
switch(reqtype){
|
|
case STANDARD_DEVICE_REQUEST_TYPE: // standard device request
|
|
if(dev2host){
|
|
std_d2h_req();
|
|
}else{
|
|
std_h2d_req();
|
|
EP_WriteIRQ(0, (uint8_t *)0, 0);
|
|
}
|
|
break;
|
|
case STANDARD_ENDPOINT_REQUEST_TYPE: // standard endpoint request
|
|
if(setup_packet.bRequest == CLEAR_FEATURE){
|
|
EP_WriteIRQ(0, (uint8_t *)0, 0);
|
|
}
|
|
break;
|
|
case VENDOR_REQUEST_TYPE:
|
|
vendor_handler(&setup_packet);
|
|
break;
|
|
case CONTROL_REQUEST_TYPE:
|
|
switch(setup_packet.bRequest){
|
|
case GET_LINE_CODING:
|
|
EP_WriteIRQ(0, (uint8_t*)&lineCoding, sizeof(lineCoding));
|
|
break;
|
|
case SET_LINE_CODING: // omit this for next stage, when data will come
|
|
break;
|
|
case SET_CONTROL_LINE_STATE:
|
|
usbON = 1;
|
|
clstate_handler(setup_packet.wValue);
|
|
break;
|
|
case SEND_BREAK:
|
|
usbON = 0;
|
|
break_handler();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if(setup_packet.bRequest != GET_LINE_CODING) EP_WriteIRQ(0, (uint8_t *)0, 0); // write acknowledgement
|
|
break;
|
|
default:
|
|
EP_WriteIRQ(0, (uint8_t *)0, 0);
|
|
}
|
|
}else if(rxflag){ // got data over EP0 or host acknowlegement
|
|
if(endpoints[0].rx_cnt){
|
|
if(setup_packet.bRequest == SET_LINE_CODING){
|
|
linecoding_handler((usb_LineCoding*)ep0databuf);
|
|
}
|
|
}
|
|
} else if(TX_FLAG(epstatus)){ // package transmitted
|
|
// now we can change address after enumeration
|
|
if ((USB->DADDR & USB_DADDR_ADD) != USB_Dev.USB_Addr){
|
|
USB->DADDR = USB_DADDR_EF | USB_Dev.USB_Addr;
|
|
// change state to ADRESSED
|
|
USB_Dev.USB_Status = USB_STATE_ADDRESSED;
|
|
}
|
|
}
|
|
epstatus = KEEP_DTOG(USB->EPnR[0]);
|
|
if(rxflag) epstatus ^= USB_EPnR_STAT_TX; // start ZLP/data transmission
|
|
else epstatus &= ~USB_EPnR_STAT_TX; // or leave unchanged
|
|
// keep DTOGs, clear CTR_RX,TX, set RX VALID
|
|
USB->EPnR[0] = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX)) ^ USB_EPnR_STAT_RX;
|
|
}
|
|
|
|
/**
|
|
* Write data to EP buffer (called from IRQ handler)
|
|
* @param number - EP number
|
|
* @param *buf - array with data
|
|
* @param size - its size
|
|
*/
|
|
void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size){
|
|
uint8_t i;
|
|
if(size > endpoints[number].txbufsz) size = endpoints[number].txbufsz;
|
|
uint16_t N2 = (size + 1) >> 1;
|
|
// the buffer is 16-bit, so we should copy data as it would be uint16_t
|
|
uint16_t *buf16 = (uint16_t *)buf;
|
|
uint32_t *out = (uint32_t *)endpoints[number].tx_buf;
|
|
for(i = 0; i < N2; ++i, ++out){
|
|
*out = buf16[i];
|
|
}
|
|
USB_BTABLE->EP[number].USB_COUNT_TX = size;
|
|
}
|
|
|
|
/**
|
|
* Write data to EP buffer (called outside IRQ handler)
|
|
* @param number - EP number
|
|
* @param *buf - array with data
|
|
* @param size - its size
|
|
*/
|
|
void EP_Write(uint8_t number, const uint8_t *buf, uint16_t size){
|
|
EP_WriteIRQ(number, buf, size);
|
|
uint16_t status = KEEP_DTOG(USB->EPnR[number]);
|
|
// keep DTOGs, clear CTR_TX & set TX VALID to start transmission
|
|
USB->EPnR[number] = (status & ~(USB_EPnR_CTR_TX)) ^ USB_EPnR_STAT_TX;
|
|
}
|
|
|
|
/*
|
|
* Copy data from EP buffer into user buffer area
|
|
* @param *buf - user array for data
|
|
* @return amount of data read
|
|
*/
|
|
int EP_Read(uint8_t number, uint16_t *buf){
|
|
int sz = endpoints[number].rx_cnt;
|
|
if(!sz) return 0;
|
|
endpoints[number].rx_cnt = 0;
|
|
int n = (sz + 1) >> 1;
|
|
uint32_t *in = (uint32_t *)endpoints[number].rx_buf;
|
|
if(n){
|
|
for(int i = 0; i < n; ++i, ++in)
|
|
buf[i] = *(uint16_t*)in;
|
|
}
|
|
return sz;
|
|
}
|
|
|