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https://github.com/eddyem/stm32samples.git
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restructuring
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196
F1:F103/USB_HID/main.c
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196
F1:F103/USB_HID/main.c
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/*
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* main.c
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*
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* Copyright 2017 Edward V. Emelianoff <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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#include "hardware.h"
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#include "keycodes.h"
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#include "usart.h"
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#include "usb.h"
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#include "usb_lib.h"
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volatile uint32_t Tms = 0;
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/* Called when systick fires */
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void sys_tick_handler(void){
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++Tms;
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}
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static void hw_setup(){
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// Enable clocks to the GPIO subsystems (PB for ADC), turn on AFIO clocking to disable SWD/JTAG
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_AFIOEN;
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// turn off SWJ/JTAG
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//AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
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// turn off USB pullup
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GPIOA->ODR = (1<<13);
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// Set led (PC13) as opendrain output
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GPIOC->CRH = CRH(13, CNF_ODOUTPUT|MODE_SLOW);
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// Set USB pullup (PA13) as opendrain output
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GPIOA->CRH = CRH(13, CNF_ODOUTPUT|MODE_SLOW);
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}
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static void iwdg_setup(){
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uint32_t tmout = 16000000;
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/* Enable the peripheral clock RTC */
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/* (1) Enable the LSI (40kHz) */
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/* (2) Wait while it is not ready */
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RCC->CSR |= RCC_CSR_LSION; /* (1) */
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while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
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/* Configure IWDG */
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/* (1) Activate IWDG (not needed if done in option bytes) */
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/* (2) Enable write access to IWDG registers */
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/* (3) Set prescaler by 64 (1.6ms for each tick) */
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/* (4) Set reload value to have a rollover each 2s */
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/* (5) Check if flags are reset */
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/* (6) Refresh counter */
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IWDG->KR = IWDG_START; /* (1) */
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IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
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IWDG->PR = IWDG_PR_PR_1; /* (3) */
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IWDG->RLR = 1250; /* (4) */
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tmout = 16000000;
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while(IWDG->SR){if(--tmout == 0) break;} /* (5) */
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IWDG->KR = IWDG_REFRESH; /* (6) */
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}
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/*
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* buf[0]: 1 - report ID
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* buf[1]: bit2 - middle button, bit1 - right, bit0 - left
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* buf[2]: move X
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* buf[3]: move Y
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* buf[4]: wheel
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*/
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static void move_mouse(int8_t x, int8_t y){
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int8_t buf[5] = {1,0,0,0,0};
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buf[2] = x; buf[3] = y;
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USB_send((uint8_t*)buf, 5);
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}
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/*
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* Keyboard buffer:
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* buf[1]: MOD
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* buf[2]: reserved
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* buf[3]..buf[8] - keycodes 1..6
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*/
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static void send_word(const char *wrd){
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char last = 0;
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do{
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// release key before pressing it again
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if(last == *wrd) USB_send(release_key(), USB_KEYBOARD_REPORT_SIZE);
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last = *wrd;
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USB_send(press_key(last), USB_KEYBOARD_REPORT_SIZE);
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IWDG->KR = IWDG_REFRESH;
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}while(*(++wrd));
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USB_send(release_key(), USB_KEYBOARD_REPORT_SIZE);
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}
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static char *parse_cmd(char *buf){
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if(buf[1] != '\n') return buf;
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switch(*buf){
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case 'p':
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pin_toggle(USBPU_port, USBPU_pin);
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SEND("USB pullup is ");
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if(pin_read(USBPU_port, USBPU_pin)) SEND("off");
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else SEND("on");
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newline();
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break;
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case 'C':
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SEND("USB ");
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if(!usbON) SEND("dis");
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SEND("connected\n");
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break;
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case 'K':
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send_word("Hello, weird and cruel world!\n\n");
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SEND("Write hello\n");
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break;
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case 'M':
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move_mouse(100, 10);
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move_mouse(0,0);
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SEND("Move mouse\n");
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break;
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case 'R':
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SEND("Soft reset\n");
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NVIC_SystemReset();
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break;
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case 'W':
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SEND("Wait for reboot\n");
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while(1){nop();};
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break;
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default: // help
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return
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"'p' - toggle USB pullup\n"
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"'C' - test if USB is configured\n"
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"'K' - emulate keyboard\n"
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"'M' - move mouse\n"
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"'R' - software reset\n"
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"'W' - test watchdog\n"
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;
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break;
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}
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return NULL;
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}
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int main(void){
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uint32_t lastT = 0;
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sysreset();
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StartHSE();
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hw_setup();
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usart_setup();
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SysTick_Config(72000);
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SEND("Hello! I'm ready.\n");
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if(RCC->CSR & RCC_CSR_IWDGRSTF){ // watchdog reset occured
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SEND("WDGRESET=1\n");
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}
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if(RCC->CSR & RCC_CSR_SFTRSTF){ // software reset occured
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SEND("SOFTRESET=1\n");
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}
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RCC->CSR |= RCC_CSR_RMVF; // remove reset flags
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USBPU_OFF();
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USB_setup();
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iwdg_setup();
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USBPU_ON();
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while (1){
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IWDG->KR = IWDG_REFRESH; // refresh watchdog
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if(lastT > Tms || Tms - lastT > 499){
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LED_blink();
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lastT = Tms;
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transmit_tbuf(); // non-blocking transmission of data from UART buffer every 0.5s
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}
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usb_proc();
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int r = 0;
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char *txt, *ans;
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if(usartrx()){ // usart1 received data, store in in buffer
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r = usart_getline(&txt);
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if(r){
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txt[r] = 0;
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ans = parse_cmd(txt);
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if(ans){
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usart_send(ans);
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transmit_tbuf();
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}
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}
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}
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}
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return 0;
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}
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