mirror of
https://github.com/eddyem/stm32samples.git
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390 lines
13 KiB
C
390 lines
13 KiB
C
/*
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* This file is part of the pl2303 project.
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* Copyright 2022 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 <stdint.h>
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#include "usb_lib.h"
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ep_t endpoints[STM32ENDPOINTS];
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usb_dev_t USB_Dev;
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static usb_LineCoding lineCoding = {115200, 0, 0, 8};
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config_pack_t setup_packet;
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uint8_t ep0databuf[EP0DATABUF_SIZE];
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uint8_t ep0dbuflen = 0;
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usb_LineCoding getLineCoding(){return lineCoding;}
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volatile uint8_t usbON = 0; // device disconnected from terminal
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// definition of parts common for USB_DeviceDescriptor & USB_DeviceQualifierDescriptor
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#define bcdUSB_L 0x10
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#define bcdUSB_H 0x01
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#define bDeviceClass 0
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#define bDeviceSubClass 0
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#define bDeviceProtocol 0
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#define bNumConfigurations 1
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static const uint8_t USB_DeviceDescriptor[] = {
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18, // bLength
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0x01, // bDescriptorType - Device descriptor
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bcdUSB_L, // bcdUSB_L - 1.10
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bcdUSB_H, // bcdUSB_H
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bDeviceClass, // bDeviceClass - USB_COMM
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bDeviceSubClass, // bDeviceSubClass
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bDeviceProtocol, // bDeviceProtocol
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USB_EP0_BUFSZ, // bMaxPacketSize
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0x7b, // idVendor_L PL2303: VID=0x067b, PID=0x2303
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0x06, // idVendor_H
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0x03, // idProduct_L
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0x23, // idProduct_H
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0x00, // bcdDevice_Ver_L
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0x03, // bcdDevice_Ver_H
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0x01, // iManufacturer
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0x02, // iProduct
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0x00, // iSerialNumber
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bNumConfigurations // bNumConfigurations
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};
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static const uint8_t USB_DeviceQualifierDescriptor[] = {
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10, //bLength
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0x06, // bDescriptorType - Device qualifier
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bcdUSB_L, // bcdUSB_L
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bcdUSB_H, // bcdUSB_H
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bDeviceClass, // bDeviceClass
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bDeviceSubClass, // bDeviceSubClass
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bDeviceProtocol, // bDeviceProtocol
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USB_EP0_BUFSZ, // bMaxPacketSize0
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bNumConfigurations, // bNumConfigurations
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0x00 // Reserved
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};
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static const uint8_t USB_ConfigDescriptor[] = {
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/*Configuration Descriptor*/
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0x09, /* bLength: Configuration Descriptor size */
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0x02, /* bDescriptorType: Configuration */
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39, /* wTotalLength:no of returned bytes */
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0x00,
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0x01, /* bNumInterfaces: 1 interface */
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0x01, /* bConfigurationValue: Configuration value */
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0x00, /* iConfiguration: Index of string descriptor describing the configuration */
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0xa0, /* bmAttributes - Bus powered, Remote wakeup */
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0x32, /* MaxPower 100 mA */
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/*---------------------------------------------------------------------------*/
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/*Interface Descriptor */
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0x09, /* bLength: Interface Descriptor size */
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0x04, /* bDescriptorType: Interface */
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0x00, /* bInterfaceNumber: Number of Interface */
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0x00, /* bAlternateSetting: Alternate setting */
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0x03, /* bNumEndpoints: 3 endpoints used */
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0xff, /* bInterfaceClass */
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0x00, /* bInterfaceSubClass */
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0x00, /* bInterfaceProtocol */
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0x00, /* iInterface: */
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///////////////////////////////////////////////////
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/*Endpoint 1 Descriptor*/
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0x07, /* bLength: Endpoint Descriptor size */
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0x05, /* bDescriptorType: Endpoint */
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0x81, /* bEndpointAddress IN1 */
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0x03, /* bmAttributes: Interrupt */
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0x0a, /* wMaxPacketSize LO: */
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0x00, /* wMaxPacketSize HI: */
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0x01, /* bInterval: */
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/*Endpoint OUT2 Descriptor*/
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0x07, /* bLength: Endpoint Descriptor size */
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0x05, /* bDescriptorType: Endpoint */
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0x02, /* bEndpointAddress: OUT2 */
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0x02, /* bmAttributes: Bulk */
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(USB_RXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
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(USB_RXBUFSZ >> 8),
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0x00, /* bInterval: ignore for Bulk transfer */
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/*Endpoint IN3 Descriptor*/
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0x07, /* bLength: Endpoint Descriptor size */
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0x05, /* bDescriptorType: Endpoint */
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0x83, /* bEndpointAddress IN3 */
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0x02, /* bmAttributes: Bulk */
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(USB_TXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
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(USB_TXBUFSZ >> 8),
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0x00, /* bInterval: ignore for Bulk transfer */
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};
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_USB_LANG_ID_(USB_StringLangDescriptor, LANG_US);
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// these descriptors are not used in PL2303 emulator!
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_USB_STRING_(USB_StringSerialDescriptor, u"0");
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_USB_STRING_(USB_StringManufacturingDescriptor, u"Prolific Technology Inc.");
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_USB_STRING_(USB_StringProdDescriptor, u"USB-Serial Controller");
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/*
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* default handlers
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*/
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// SET_LINE_CODING
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void WEAK linecoding_handler(usb_LineCoding __attribute__((unused)) *lc){
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}
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// SET_CONTROL_LINE_STATE
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void WEAK clstate_handler(uint16_t __attribute__((unused)) val){
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}
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// SEND_BREAK
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void WEAK break_handler(){
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}
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// handler of vendor requests
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void WEAK vendor_handler(config_pack_t *packet){
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uint16_t c;
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if(packet->bmRequestType & 0x80){ // read
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switch(packet->wValue){
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case 0x8484:
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c = 2;
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break;
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case 0x0080:
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c = 1;
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break;
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case 0x8686:
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c = 0xaa;
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break;
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default:
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c = 0;
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}
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EP_WriteIRQ(0, (uint8_t*)&c, 1);
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}else{ // write ZLP
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c = 0;
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EP_WriteIRQ(0, (uint8_t *)&c, 0);
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}
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}
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static void wr0(const uint8_t *buf, uint16_t size){
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if(setup_packet.wLength < size) size = setup_packet.wLength; // shortened request
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if(size < endpoints[0].txbufsz){
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EP_WriteIRQ(0, buf, size);
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return;
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}
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while(size){
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uint16_t l = size;
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if(l > endpoints[0].txbufsz) l = endpoints[0].txbufsz;
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EP_WriteIRQ(0, buf, l);
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buf += l;
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size -= l;
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uint8_t needzlp = (l == endpoints[0].txbufsz) ? 1 : 0;
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if(size || needzlp){ // send last data buffer
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uint16_t status = KEEP_DTOG(USB->EPnR[0]);
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// keep DTOGs, clear CTR_RX,TX, set TX VALID, leave stat_Rx
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USB->EPnR[0] = (status & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX|USB_EPnR_STAT_RX))
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^ USB_EPnR_STAT_TX;
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uint32_t ctr = 1000000;
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while(--ctr && (USB->ISTR & USB_ISTR_CTR) == 0){IWDG->KR = IWDG_REFRESH;};
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if((USB->ISTR & USB_ISTR_CTR) == 0){
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return;
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}
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if(needzlp) EP_WriteIRQ(0, (uint8_t*)0, 0);
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}
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}
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}
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static inline void get_descriptor(){
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switch(setup_packet.wValue){
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case DEVICE_DESCRIPTOR:
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wr0(USB_DeviceDescriptor, sizeof(USB_DeviceDescriptor));
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break;
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case CONFIGURATION_DESCRIPTOR:
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wr0(USB_ConfigDescriptor, sizeof(USB_ConfigDescriptor));
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break;
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case STRING_LANG_DESCRIPTOR:
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wr0((const uint8_t *)&USB_StringLangDescriptor, STRING_LANG_DESCRIPTOR_SIZE_BYTE);
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break;
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case STRING_MAN_DESCRIPTOR:
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wr0((const uint8_t *)&USB_StringManufacturingDescriptor, USB_StringManufacturingDescriptor.bLength);
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break;
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case STRING_PROD_DESCRIPTOR:
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wr0((const uint8_t *)&USB_StringProdDescriptor, USB_StringProdDescriptor.bLength);
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break;
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case STRING_SN_DESCRIPTOR:
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wr0((const uint8_t *)&USB_StringSerialDescriptor, USB_StringSerialDescriptor.bLength);
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break;
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case DEVICE_QUALIFIER_DESCRIPTOR:
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wr0(USB_DeviceQualifierDescriptor, USB_DeviceQualifierDescriptor[0]);
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break;
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default:
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break;
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}
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}
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static uint16_t configuration = 0; // reply for GET_CONFIGURATION (==1 if configured)
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static inline void std_d2h_req(){
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uint16_t status = 0; // bus powered
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switch(setup_packet.bRequest){
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case GET_DESCRIPTOR:
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get_descriptor();
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break;
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case GET_STATUS:
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EP_WriteIRQ(0, (uint8_t *)&status, 2); // send status: Bus Powered
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break;
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case GET_CONFIGURATION:
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EP_WriteIRQ(0, (uint8_t*)&configuration, 1);
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break;
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default:
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break;
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}
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}
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static inline void std_h2d_req(){
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switch(setup_packet.bRequest){
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case SET_ADDRESS:
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// new address will be assigned later - after acknowlegement or request to host
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USB_Dev.USB_Addr = setup_packet.wValue;
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break;
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case SET_CONFIGURATION:
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// Now device configured
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USB_Dev.USB_Status = USB_STATE_CONFIGURED;
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configuration = setup_packet.wValue;
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break;
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default:
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break;
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}
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}
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/*
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bmRequestType: 76543210
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7 direction: 0 - host->device, 1 - device->host
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65 type: 0 - standard, 1 - class, 2 - vendor
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4..0 getter: 0 - device, 1 - interface, 2 - endpoint, 3 - other
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*/
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/**
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* Endpoint0 (control) handler
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*/
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void EP0_Handler(){
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uint16_t epstatus = USB->EPnR[0]; // EP0R on input -> return this value after modifications
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uint8_t reqtype = setup_packet.bmRequestType & 0x7f;
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uint8_t dev2host = (setup_packet.bmRequestType & 0x80) ? 1 : 0;
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int rxflag = RX_FLAG(epstatus);
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if(rxflag && SETUP_FLAG(epstatus)){
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switch(reqtype){
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case STANDARD_DEVICE_REQUEST_TYPE: // standard device request
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if(dev2host){
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std_d2h_req();
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}else{
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std_h2d_req();
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EP_WriteIRQ(0, (uint8_t *)0, 0);
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}
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break;
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case STANDARD_ENDPOINT_REQUEST_TYPE: // standard endpoint request
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if(setup_packet.bRequest == CLEAR_FEATURE){
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EP_WriteIRQ(0, (uint8_t *)0, 0);
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}
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break;
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case VENDOR_REQUEST_TYPE:
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vendor_handler(&setup_packet);
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break;
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case CONTROL_REQUEST_TYPE:
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switch(setup_packet.bRequest){
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case GET_LINE_CODING:
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EP_WriteIRQ(0, (uint8_t*)&lineCoding, sizeof(lineCoding));
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break;
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case SET_LINE_CODING: // omit this for next stage, when data will come
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break;
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case SET_CONTROL_LINE_STATE:
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usbON = 1;
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clstate_handler(setup_packet.wValue);
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break;
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case SEND_BREAK:
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usbON = 0;
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break_handler();
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break;
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default:
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break;
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}
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if(setup_packet.bRequest != GET_LINE_CODING) EP_WriteIRQ(0, (uint8_t *)0, 0); // write acknowledgement
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break;
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default:
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EP_WriteIRQ(0, (uint8_t *)0, 0);
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}
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}else if(rxflag){ // got data over EP0 or host acknowlegement
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if(endpoints[0].rx_cnt){
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if(setup_packet.bRequest == SET_LINE_CODING){
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linecoding_handler((usb_LineCoding*)ep0databuf);
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}
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}
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} else if(TX_FLAG(epstatus)){ // package transmitted
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// now we can change address after enumeration
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if ((USB->DADDR & USB_DADDR_ADD) != USB_Dev.USB_Addr){
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USB->DADDR = USB_DADDR_EF | USB_Dev.USB_Addr;
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// change state to ADRESSED
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USB_Dev.USB_Status = USB_STATE_ADDRESSED;
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}
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}
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epstatus = KEEP_DTOG(USB->EPnR[0]);
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if(rxflag) epstatus ^= USB_EPnR_STAT_TX; // start ZLP/data transmission
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else epstatus &= ~USB_EPnR_STAT_TX; // or leave unchanged
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// keep DTOGs, clear CTR_RX,TX, set RX VALID
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USB->EPnR[0] = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX)) ^ USB_EPnR_STAT_RX;
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}
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/**
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* Write data to EP buffer (called from IRQ handler)
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* @param number - EP number
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* @param *buf - array with data
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* @param size - its size
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*/
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void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size){
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uint8_t i;
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if(size > endpoints[number].txbufsz) size = endpoints[number].txbufsz;
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uint16_t N2 = (size + 1) >> 1;
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// the buffer is 16-bit, so we should copy data as it would be uint16_t
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uint16_t *buf16 = (uint16_t *)buf;
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uint32_t *out = (uint32_t *)endpoints[number].tx_buf;
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for(i = 0; i < N2; ++i, ++out){
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*out = buf16[i];
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}
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USB_BTABLE->EP[number].USB_COUNT_TX = size;
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}
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/**
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* Write data to EP buffer (called outside IRQ handler)
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* @param number - EP number
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* @param *buf - array with data
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* @param size - its size
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*/
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void EP_Write(uint8_t number, const uint8_t *buf, uint16_t size){
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EP_WriteIRQ(number, buf, size);
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uint16_t status = KEEP_DTOG(USB->EPnR[number]);
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// keep DTOGs, clear CTR_TX & set TX VALID to start transmission
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USB->EPnR[number] = (status & ~(USB_EPnR_CTR_TX)) ^ USB_EPnR_STAT_TX;
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}
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/*
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* Copy data from EP buffer into user buffer area
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* @param *buf - user array for data
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* @return amount of data read
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*/
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int EP_Read(uint8_t number, uint16_t *buf){
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int sz = endpoints[number].rx_cnt;
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if(!sz) return 0;
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endpoints[number].rx_cnt = 0;
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int n = (sz + 1) >> 1;
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uint32_t *in = (uint32_t *)endpoints[number].rx_buf;
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if(n){
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for(int i = 0; i < n; ++i, ++in)
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buf[i] = *(uint16_t*)in;
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}
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return sz;
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}
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