restructuring

F0:F030,F042,F072/F0_testbrd/usb.c

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+/*
+ *                                                                                                  geany_encoding=koi8-r
+ * usb.c - base functions for different USB types
+ *
+ * Copyright 2018 Edward V. Emelianov <eddy@sao.ru, 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ */
+
+#include "usb.h"
+#include "usb_lib.h"
+
+static volatile uint8_t tx_succesfull = 1;
+static volatile uint8_t rxNE = 0;
+
+// 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_setup(){
+    RCC->APB1ENR |= RCC_APB1ENR_CRSEN | RCC_APB1ENR_USBEN; // enable CRS (hsi48 sync) & USB
+    RCC->CFGR3 &= ~RCC_CFGR3_USBSW; // reset USB
+    RCC->CR2 |= RCC_CR2_HSI48ON; // turn ON HSI48
+    uint32_t tmout = 16000000;
+    while(!(RCC->CR2 & RCC_CR2_HSI48RDY)){if(--tmout == 0) break;}
+    FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;
+    CRS->CFGR &= ~CRS_CFGR_SYNCSRC;
+    CRS->CFGR |= CRS_CFGR_SYNCSRC_1; // USB SOF selected as sync source
+    CRS->CR |= CRS_CR_AUTOTRIMEN; // enable auto trim
+    CRS->CR |= CRS_CR_CEN; // enable freq counter & block CRS->CFGR as read-only
+    RCC->CFGR |= RCC_CFGR_SW;
+    // allow RESET and CTRM interrupts
+    USB->CNTR = USB_CNTR_RESETM | USB_CNTR_CTRM;
+    // clear flags
+    USB->ISTR = 0;
+    // and activate pullup
+    USB->BCDR |= USB_BCDR_DPPU;
+    NVIC_EnableIRQ(USB_IRQn);
+}
+
+static int usbwr(const uint8_t *buf, uint16_t l){
+    uint32_t ctra = 1000000;
+    while(--ctra && tx_succesfull == 0){
+        IWDG->KR = IWDG_REFRESH;
+    }
+    tx_succesfull = 0;
+    EP_Write(3, buf, l);
+    ctra = 1000000;
+    while(--ctra && tx_succesfull == 0){
+        IWDG->KR = IWDG_REFRESH;
+    }
+    if(tx_succesfull == 0){usbON = 0; return 1;} // usb is OFF?
+    return 0;
+}
+
+static uint8_t usbbuff[USB_TXBUFSZ-1]; // temporary buffer (63 - to prevent need of ZLP)
+static uint8_t buflen = 0; // amount of symbols in usbbuff
+
+// send next up to 63 bytes of data in usbbuff
+static void send_next(){
+    if(!buflen || !tx_succesfull) return;
+    tx_succesfull = 0;
+    EP_Write(3, usbbuff, buflen);
+    buflen = 0;
+}
+
+// unblocking sending - just fill a buffer
+void USB_send(const uint8_t *buf, uint16_t len){
+    if(!usbON || !len) return;
+    if(len > USB_TXBUFSZ-1 - buflen){
+        usbwr(usbbuff, buflen);
+        buflen = 0;
+    }
+    if(len > USB_TXBUFSZ-1){
+        USB_send_blk(buf, len);
+        return;
+    }
+    while(len--) usbbuff[buflen++] = *buf++;
+}
+
+// blocking sending
+void USB_send_blk(const uint8_t *buf, uint16_t len){
+    if(!usbON || !len) return; // USB disconnected
+    if(buflen){
+        usbwr(usbbuff, buflen);
+        buflen = 0;
+    }
+    int needzlp = 0;
+    while(len){
+        if(len == USB_TXBUFSZ) needzlp = 1;
+        uint16_t s = (len > USB_TXBUFSZ) ? USB_TXBUFSZ : len;
+        if(usbwr(buf, s)) return;
+        len -= s;
+        buf += s;
+    }
+    if(needzlp){
+        usbwr(NULL, 0);
+    }
+}
+
+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;
+            send_next();
+    }
+}
+
+/**
+ * @brief USB_receive
+ * @param buf (i) - buffer[64] for received data
+ * @return amount of received bytes
+ */
+uint8_t USB_receive(uint8_t *buf){
+    if(!usbON || !rxNE) return 0;
+    uint8_t sz = EP_Read(2, 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;
+}