ST STM32F101xx User Manual

RM0008 USB on-the-go full-speed (OTG_FS)
Doc ID 13902 Rev 12 905/1096
Disable Channel
if (STALL)
{
Transfer Done = 1
}
}
else
if (NAK or TXERR)
{
Rewind Buffer Pointers
Reset Error Count
Mask ACK
Unmask CHH
Disable Channel
}
else
if (CHH)
{
Mask CHH
if (Transfer Done or (Error_count == 3))
{
De-allocate Channel
}
else
{
Re-initialize Channel (in next b_interval - 1 Frame)
}
}
else
if (ACK)
{
Reset Error Count
Mask ACK
}
The application uses the NPTXFE interrupt in OTG_FS_GINTSTS to find the transmit
FIFO space.
b) Interrupt IN
Unmask (NAK/TXERR/XFRC/BBERR/STALL/FRMOR/DTERR)
if (XFRC)
{
Reset Error Count
Mask ACK
if (OTG_FS_HCTSIZx.PKTCNT == 0)
{
De-allocate Channel
}
else
{
Transfer Done = 1
Unmask CHH
Disable Channel

ST STM32F101xx Specifications

General

Series	STM32F1
Core	ARM Cortex-M3
GPIO Pins	Up to 80
Communication Interfaces	I2C, SPI, USART
Operating Voltage	2.0 to 3.6 V
Program Memory Type	Flash
Connectivity	I2C, SPI, USART
Flash Memory	16 KB to 128 KB
ADC	12-bit
Peripherals	ADC, DMA, Timers, GPIO
Operating Temperature	-40°C to 85°C
Package	LQFP, BGA