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https://github.com/eddyem/stm32samples.git
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add USB temlpate for F303
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eddyem
158
F3:F303/USB_template/usb.c
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158
F3:F303/USB_template/usb.c
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#include <string.h>
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#include "hardware.h"
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#include "ringbuffer.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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static volatile ringbuffer out = {.data = obuf, .length = RBOUTSZ, .head = 0, .tail = 0};
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static volatile ringbuffer in = {.data = ibuf, .length = RBINSZ, .head = 0, .tail = 0};
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// transmission is succesfull
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static volatile uint8_t bufisempty = 1;
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static volatile uint8_t bufovrfl = 0;
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static 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*)&out, (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*)&out, 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*)&out, &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*)&in, buf, len);
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if(bufovrfl){
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RB_clearbuf((ringbuffer*)&in);
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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*)&in, '\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*)&in);
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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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// interrupt IN handler (never used?)
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static void EP1_Handler(){
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uint16_t epstatus = KEEP_DTOG(USB->EPnR[1]);
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if(RX_FLAG(epstatus)) epstatus = (epstatus & ~USB_EPnR_STAT_TX) ^ USB_EPnR_STAT_RX; // set valid RX
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else epstatus = epstatus & ~(USB_EPnR_STAT_TX|USB_EPnR_STAT_RX);
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// clear CTR
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epstatus = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX));
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USB->EPnR[1] = epstatus;
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}
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// data IN/OUT handlers
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static void transmit_Handler(){ // EP3IN
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uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[3]);
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// clear CTR keep DTOGs & STATs
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USB->EPnR[3] = (epstatus & ~(USB_EPnR_CTR_TX)); // clear TX ctr
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send_next();
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}
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static void receive_Handler(){ // EP2OUT
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uint8_t buf[USB_RXBUFSZ];
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uint16_t epstatus = KEEP_DTOG(USB->EPnR[2]);
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uint8_t sz = EP_Read(2, (uint16_t*)buf);
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if(sz){
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if(RB_write((ringbuffer*)&in, buf, sz) != sz) bufovrfl = 1;
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}
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// keep stat_tx & set ACK rx, clear RX ctr
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USB->EPnR[2] = (epstatus & ~USB_EPnR_CTR_RX) ^ USB_EPnR_STAT_RX;
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}
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void USB_proc(){
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switch(USB_Dev.USB_Status){
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case USB_STATE_CONFIGURED:
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// make new BULK endpoint
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// Buffer have 1024 bytes, but last 256 we use for CAN bus (30.2 of RM: USB main features)
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EP_Init(1, EP_TYPE_INTERRUPT, USB_EP1BUFSZ, 0, EP1_Handler); // IN1 - transmit
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EP_Init(2, EP_TYPE_BULK, 0, USB_RXBUFSZ, receive_Handler); // OUT2 - receive data
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EP_Init(3, EP_TYPE_BULK, USB_TXBUFSZ, 0, transmit_Handler); // IN3 - transmit data
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USB_Dev.USB_Status = USB_STATE_CONNECTED;
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break;
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case USB_STATE_DEFAULT:
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case USB_STATE_ADDRESSED:
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if(usbON){
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usbON = 0;
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}
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break;
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default: // USB_STATE_CONNECTED - send next data portion
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if(!usbON) return;
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}
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}
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