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stm32 update fifo in comment

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This commit is contained in:
hathach 2019-03-17 15:07:49 +07:00
parent e39b4199b0
commit f932cf3854
1 changed files with 5 additions and 9 deletions

14
src/portable/st/stm32f4/dcd_stm32f4.c

@ -82,7 +82,7 @@ static void bus_reset(void) {
// Peripheral FIFO architecture (Rev18 RM 29.11)
//
// --------------- 312.5 ( 1250 bytes )
// --------------- 320 ( 1280 bytes )
// | IN FIFO 3 |
// --------------- y + x + 16 + GRXFSIZ
// | IN FIFO 2 |
@ -100,15 +100,11 @@ static void bus_reset(void) {
// * 10 locations in hardware for setup packets + setup control words
// (up to 3 setup packets).
// * 2 locations for OUT endpoint control words.
// * 16 + 1 (data + info) for largest packet size of 64 bytes.
// * 16 for largest packet size of 64 bytes. ( TODO Highspeed is 512 bytes)
// * 1 location for global NAK (not required/used here).
//
// However, for OUT FIFO, 10 + 2 + 16 = 28 doesn't seem to work (TODO: why?).
// Minimum that works in practice is 35, so allocate 40 32-bit locations
// as a buffer.
//
// It is recommended to allocate 2 times the largest packet size, therefore
// Recommended value = 10 + 1 + 2 x (16+1) = 45 --> Let's make it 50
// Recommended value = 10 + 1 + 2 x (16+2) = 47 --> Let's make it 50
USB_OTG_FS->GRXFSIZ = 50;
// Control IN uses FIFO 0 with 64 bytes ( 16 32-bit word )
@ -252,7 +248,7 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
} else {
// Peripheral FIFO architecture (Rev18 RM 29.11)
//
// --------------- 312.5 ( 1250 bytes )
// --------------- 320 ( 1280 bytes )
// | IN FIFO 3 |
// --------------- y + x + 16 + GRXFSIZ
// | IN FIFO 2 |
@ -265,7 +261,7 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
// | ( Shared ) |
// --------------- 0
//
// Since OUT FIFO = 50, FIFO0 = 16, average of FIFOx = (312-50-16) / 3 = 82 ~ 80
// Since OUT FIFO = 50, FIFO 0 = 16, average of FIFOx = (312-50-16) / 3 = 82 ~ 80
in_ep[epnum].DIEPCTL |= (1 << USB_OTG_DIEPCTL_USBAEP_Pos) | \
(epnum - 1) << USB_OTG_DIEPCTL_TXFNUM_Pos | \