From 207281a869e04229c275cd2a3c447456c77309f2 Mon Sep 17 00:00:00 2001 From: Manuel Odendahl Date: Mon, 26 Nov 2012 17:20:27 +0100 Subject: Add double buffering routines Signed-off-by: Manuel Odendahl --- libmaple/usb/stm32f1/usb_reg_map.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'libmaple/usb/stm32f1/usb_reg_map.c') diff --git a/libmaple/usb/stm32f1/usb_reg_map.c b/libmaple/usb/stm32f1/usb_reg_map.c index 75562e1..fbfca86 100644 --- a/libmaple/usb/stm32f1/usb_reg_map.c +++ b/libmaple/usb/stm32f1/usb_reg_map.c @@ -58,6 +58,26 @@ void usb_copy_from_pma(uint8 *buf, uint16 len, uint16 pma_offset) { } } +void usb_set_ep_rx_buf0_count(uint8 ep, uint16 count) { + uint32 *rxc = usb_ep_tx_count_ptr(ep); + uint16 nblocks; + if (count > 62) { + /* use 32-byte memory block size */ + nblocks = count >> 5; + if ((count & 0x1F) == 0) { + nblocks--; + } + *rxc = (nblocks << 10) | 0x8000; + } else { + /* use 2-byte memory block size */ + nblocks = count >> 1; + if ((count & 0x1) != 0) { + nblocks++; + } + *rxc = nblocks << 10; + } +} + void usb_set_ep_rx_count(uint8 ep, uint16 count) { uint32 *rxc = usb_ep_rx_count_ptr(ep); uint16 nblocks; -- cgit v1.2.3