mirror of
https://github.com/eddyem/stm32samples.git
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91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/*
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* geany_encoding=koi8-r
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* usb.c - base functions for different USB types
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*
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* Copyright 2018 Edward V. Emelianov <eddy@sao.ru, 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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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#include "keycodes.h"
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#include "usb.h"
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#include "usb_lib.h"
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#include "usart.h"
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static volatile uint8_t tx_succesfull = 1;
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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{
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tx_succesfull = 1;
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epstatus = epstatus & ~(USB_EPnR_STAT_TX|USB_EPnR_STAT_RX);
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}
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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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void USB_setup(){
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RCC->APB1ENR |= RCC_APB1ENR_CRSEN | RCC_APB1ENR_USBEN; // enable CRS (hsi48 sync) & USB
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RCC->CFGR3 &= ~RCC_CFGR3_USBSW; // reset USB
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RCC->CR2 |= RCC_CR2_HSI48ON; // turn ON HSI48
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uint32_t tmout = 16000000;
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while(!(RCC->CR2 & RCC_CR2_HSI48RDY)){if(--tmout == 0) break;}
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FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;
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CRS->CFGR &= ~CRS_CFGR_SYNCSRC;
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CRS->CFGR |= CRS_CFGR_SYNCSRC_1; // USB SOF selected as sync source
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CRS->CR |= CRS_CR_AUTOTRIMEN; // enable auto trim
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CRS->CR |= CRS_CR_CEN; // enable freq counter & block CRS->CFGR as read-only
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RCC->CFGR |= RCC_CFGR_SW;
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// allow RESET and CTRM interrupts
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USB->CNTR = USB_CNTR_RESETM | USB_CNTR_CTRM;
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// clear flags
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USB->ISTR = 0;
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// and activate pullup
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USB->BCDR |= USB_BCDR_DPPU;
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NVIC_EnableIRQ(USB_IRQn);
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}
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void usb_proc(){
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if(USB_Dev.USB_Status == USB_STATE_CONFIGURED){ // USB configured - activate other endpoints
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if(!usbON){ // endpoints not activated
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EP_Init(1, EP_TYPE_INTERRUPT, USB_TXBUFSZ, 0, EP1_Handler); // IN1 - transmit
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usbON = 1;
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}
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}else{
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usbON = 0;
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}
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}
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void USB_send(uint8_t *buf, uint16_t size){
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if(!usbON) return;
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uint16_t ctr = 0;
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while(size){
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uint16_t s = (size > USB_KEYBOARD_REPORT_SIZE) ? USB_KEYBOARD_REPORT_SIZE : size;
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tx_succesfull = 0;
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EP_Write(1, (uint8_t*)&buf[ctr], s);
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uint32_t ctra = 1000000;
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while(--ctra && tx_succesfull == 0){
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IWDG->KR = IWDG_REFRESH;
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}
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if(!tx_succesfull) return;
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size -= s;
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ctr += s;
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}
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}
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