Posted on April 16, 2014 at 10:05
See the schematic of my board. I'm not using U_DET pin.
STM32Cube firmware has an sample. The path is
C:\Users\Administrator\Downloads\STM32Cube_FW_F4_V1.1.0\Projects\STM324xG_EVAL\Applications\USB_Device\CDC_Standalone\Src They say:This example is a part of the USB Device Library package using STM32Cube firmware. It describes how to use USB device application based on the Device Communication Class (CDC) following the PSTN subprotocol in the STM32F4xx devices using the OTG-USB and UART peripherals.
I have removed UART part of the sample as I need only VCP part. But still no luck. My board has 12MHz crystal, I modified HSE_VALUE to 12 MHz. Here is my clock configuration which was also correct.static
void
SystemClock_Config(
void
)
{
RCC_OscInitTypeDef RCC_OscInit;
RCC_ClkInitTypeDef RCC_ClkInit;
/* Enable Power Control clock */
__PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/* Configure RCC Oscillators: All parameters can be changed according to user뭩 needs */
RCC_OscInit.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInit.HSEState = RCC_HSE_ON;
RCC_OscInit.PLL.PLLState = RCC_PLL_ON;
RCC_OscInit.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInit.PLL.PLLM = 8;
RCC_OscInit.PLL.PLLN = 224;
RCC_OscInit.PLL.PLLP = 2;
RCC_OscInit.PLL.PLLQ = 7;
HAL_RCC_OscConfig (&RCC_OscInit);
/* RCC Clocks: All parameters can be changed according to user뭩 needs */
RCC_ClkInit.ClockType = RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_HCLK |RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
RCC_ClkInit.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInit.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInit.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInit.APB2CLKDivider = RCC_HCLK_DIV2;
HAL_RCC_ClockConfig (&RCC_ClkInit, FLASH_LATENCY_5);
}