It is not recognized as a USB device. What did I do wrong or miss?
IC: STM32F103CBT6
1. Is the distance between USB D+ and PA12 (Pin 33) and USB D- and PA11 (Pin 32) long?
The distance from USB D+ to PA12 and USB D- to PA11 is approximately 35 mm (1,384 mil) each.
The distance between R1 (0 Ω) on USB D+ and R3 (0 Ω) on USB D- is each approximately 6 mm (25 mil).
2. Are bias resistance (4.7k ~ 10k) required for USB D+ and USB D-?
USB D+ and USB D- use 5V TVS (D3, D4) and decoupling (C94, C95) is 6.8pF each.
3. Is the USB VCC connection incorrect?
5V+ is connected to J16 (excluded from the picture as it may cause crosstalk), and the external power or USB VCC is connected to 3.2V through R21 (2.7kΩ) and R22 (4.7kΩ) to PB3 (Pin 39).
Remove C68, R53, L7 and connect directly to GND or
Remove AR3, L4 and connect directly to GND or
Removing D3, D4 and C94, C95 results in it not being recognized as a USB device.
USBD_DFU_MEDIA Interface: @Internal Flash /0x08000000/03*016Ka,01*016Kg,01*064Kg,07*128Kg,04*016Kg,01*064Kg,07*128Kg
The program used the source code created in STM32CubeIDE and only modified main() in main.c.
The main() function contents are as follows:
int main(void)
{
/* USER CODE BEGIN 1 */
typedef void (*pFunction)(void);
uint32_t JumpAddress;
void (*Jump_To_Application)();
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
/* USER CODE BEGIN 2 */
if (HAL_GPIO_ReadPin(Firmup_Pin_GPIO_Port, Firmup_Pin_Pin) != GPIO_PIN_RESET)
{
if (((*(__IO uint32_t*)USBD_DFU_APP_DEFAULT_ADD - 1) & 0x2FFFB000 ) == 0x20000000)
{
JumpAddress = *(__IO uint32_t*) (USBD_DFU_APP_DEFAULT_ADD + 4);
Jump_To_Application = (pFunction) JumpAddress;
__set_MSP(*(__IO uint32_t*) USBD_DFU_APP_DEFAULT_ADD);
Jump_To_Application();
}
}
MX_USB_DEVICE_Init();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
