116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
#include "FreeRTOS.h"
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#include "stm32f1xx.h"
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#include "task.h"
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#include "tusb.h"
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// Глобальная переменная для CMSIS
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/* uint32_t SystemCoreClock = 72000000; */
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// --- System Clock Config (72MHz from 8MHz HSE) ---
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void SystemClock_Config(void) {
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// Включаем HSE
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RCC->CR |= RCC_CR_HSEON;
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while (!(RCC->CR & RCC_CR_HSERDY));
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// Настраиваем Flash latency (2 wait states)
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FLASH->ACR |= FLASH_ACR_LATENCY_2;
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// PLL: HSE * 9 = 72 MHz
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RCC->CFGR |= (RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL9);
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// Включаем PLL
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RCC->CR |= RCC_CR_PLLON;
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while (!(RCC->CR & RCC_CR_PLLRDY));
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// Переключаем System Clock на PLL
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RCC->CFGR |= RCC_CFGR_SW_PLL;
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while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
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SystemCoreClock = 72000000;
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}
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// --- Задачи FreeRTOS ---
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void usb_device_task(void *param) {
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(void)param;
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while (1) { tud_task(); }
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}
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void cdc_task(void *param) {
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(void)param;
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while (1) {
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GPIOC->BSRR = GPIO_BSRR_BR13; // LED ON
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vTaskDelay(pdMS_TO_TICKS(500));
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GPIOC->BSRR = GPIO_BSRR_BS13; // LED OFF
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vTaskDelay(pdMS_TO_TICKS(500));
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if (tud_cdc_connected()) {
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if (tud_cdc_available()) {
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uint8_t buf[64];
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uint32_t count = tud_cdc_read(buf, sizeof(buf));
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tud_cdc_write(buf, count);
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tud_cdc_write_flush();
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}
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}
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vTaskDelay(pdMS_TO_TICKS(1));
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}
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}
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// Программный сброс USB (Soft-Connect)
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void force_usb_reset(void) {
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// Включаем тактирование порта A
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
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// Настраиваем PA12 (USB D+) как Output Push-Pull
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GPIOA->CRH &= ~GPIO_CRH_CNF12;
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GPIOA->CRH |= GPIO_CRH_MODE12_1; // Output 2MHz
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// Прижимаем к земле (Logic 0) на 10 мс
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GPIOA->BSRR = GPIO_BSRR_BR12;
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for (volatile int i = 0; i < 500000; i++) __NOP(); // ~10ms при 72MHz
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// Возвращаем в состояние Input Floating
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GPIOA->CRH &= ~GPIO_CRH_MODE12;
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GPIOA->CRH |= GPIO_CRH_CNF12_0; // Floating input
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}
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int main(void) {
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SystemClock_Config();
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// Моргаем светодиодом
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RCC->APB2ENR |= RCC_APB2ENR_IOPCEN; // Включаем GPIOC
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GPIOC->CRH &= ~GPIO_CRH_CNF13; // PC13 (LED)
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GPIOC->CRH |= GPIO_CRH_MODE13_1; // Output 2MHz
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force_usb_reset();
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// Включаем тактирование USB и GPIOA
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
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RCC->APB1ENR |= RCC_APB1ENR_USBEN;
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// ВКЛЮЧАЕМ ПРЕРЫВАНИЯ USB (КРИТИЧНО!)
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NVIC_EnableIRQ(USB_HP_CAN1_TX_IRQn);
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NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
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NVIC_EnableIRQ(USBWakeUp_IRQn);
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tusb_init();
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xTaskCreate(usb_device_task, "usbd", 128, NULL, 3, NULL);
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xTaskCreate(cdc_task, "cdc", 128, NULL, 2, NULL);
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vTaskStartScheduler();
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while (1);
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}
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// Обработчики прерываний
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void USB_HP_CAN1_TX_IRQHandler(void) {
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tud_int_handler(0);
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}
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void USB_LP_CAN1_RX0_IRQHandler(void) {
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tud_int_handler(0);
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}
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void USBWakeUp_IRQHandler(void) {
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tud_int_handler(0);
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}
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