diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_usbdev.c')
| -rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_usbdev.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_usbdev.c b/nuttx/arch/arm/src/stm32/stm32_usbdev.c index c62c4277e..bf49b6665 100644 --- a/nuttx/arch/arm/src/stm32/stm32_usbdev.c +++ b/nuttx/arch/arm/src/stm32/stm32_usbdev.c @@ -124,14 +124,15 @@ #define STM32_EP0MAXPACKET STM32_MAXPACKET_SIZE -/* Buffer description table. We assume that USB has excluse use of the buffer - * table. The buffer table is positioned at the beginning of the 512-byte +/* Buffer descriptor table. We assume that USB has exclusive use of CAN/USB + * memory. The buffer table is positioned at the beginning of the 512-byte * CAN/USB memory. We will use the first STM32_NENDPOINTS*4 words for the buffer - * table. + * table. That is exactly 64 bytes, leaving 7*64 bytes for endpoint buffers. */ -#define STM32_BTABLE_ADDRESS (0x00) -#define STM32_BTABLE_SIZE (0x18) +#define STM32_BTABLE_ADDRESS (0x00) /* Start at the beginning of USB/CAN RAM */ +#define STM32_DESC_SIZE (8) /* Each descriptor is 4*2=8 bytes in size */ +#define STM32_BTABLE_SIZE (STM32_NENDPOINTS*STM32_DESC_SIZE) /* Buffer layout. Assume that all buffers are 64-bytes (maxpacketsize), then * we have space for only 7 buffers; endpoint 0 will require two buffers, leaving |