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Minor corrections for PR

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- externerlize code into functions
- correct comments
This commit is contained in:
Reinhard Panhuber 2021-01-04 17:00:23 +01:00
parent 37bb14678a
commit 2fa500af18
1 changed files with 37 additions and 26 deletions
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63
src/portable/st/synopsys/dcd_synopsys.c
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@ -151,6 +151,36 @@ static uint16_t ep0_pending[2]; // Index determines direction
static uint16_t _allocated_fifo_words_tx; // TX FIFO size in words (IN EPs)
static bool _rx_ep_closed; // Flag to check if RX FIFO size needs an update (reduce its size)
// Calculate the RX FIFO size according to recommendations from reference manual
// ep_size in words
static inline uint16_t calc_rx_ff_size(uint16_t ep_size)
{
return 15 + 2*ep_size + 2*EP_MAX;
}
static inline void update_grxfsiz()
{
// If an OUT EP was closed update (reduce) the RX FIFO size if RX FIFO is empty - since this function handle_rxflvl_ints() gets looped from dcd_int_handler() until RX FIFO is empty it is guaranteed to be entered
if (_rx_ep_closed)
{
USB_OTG_GlobalTypeDef * usb_otg = GLOBAL_BASE(rhport);
// Determine largest EP size for RX FIFO
uint16_t sz = xfer_status[0][TUSB_DIR_OUT].max_size;
for (uint8_t cnt = 1; cnt < EP_MAX; cnt++)
{
if (sz < xfer_status[cnt][TUSB_DIR_OUT].max_size) sz = xfer_status[cnt][TUSB_DIR_OUT].max_size;
}
// Update size of RX FIFO
usb_otg->GRXFSIZ = calc_rx_ff_size(sz/4); // sz was in bytes and is now needed in words
// Disable flag
_rx_ep_closed = false;
}
}
// Setup the control endpoint 0.
static void bus_reset(uint8_t rhport)
{
@ -223,12 +253,12 @@ static void bus_reset(uint8_t rhport)
// overwrite this.
#if TUD_OPT_HIGH_SPEED
usb_otg->GRXFSIZ = 271 + 2*EP_MAX;
usb_otg->GRXFSIZ = calc_rx_ff_size(128);
#else
usb_otg->GRXFSIZ = 47 + 2*EP_MAX;
usb_otg->GRXFSIZ = calc_rx_ff_size(16);
#endif
_allocated_fifo_words_tx += 16;
_allocated_fifo_words_tx = 16;
// Control IN uses FIFO 0 with 64 bytes ( 16 32-bit word )
usb_otg->DIEPTXF0_HNPTXFSIZ = (16 << USB_OTG_TX0FD_Pos) | (EP_FIFO_SIZE/4 - _allocated_fifo_words_tx);
@ -563,7 +593,7 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
if(dir == TUSB_DIR_OUT)
{
// Calculate required size of RX FIFO
uint16_t const sz = 15 + 2*fifo_size + 2*EP_MAX;
uint16_t const sz = calc_rx_ff_size(fifo_size);
// If size_rx needs to be extended check if possible and if so enlarge it
if (usb_otg->GRXFSIZ < sz)
@ -602,10 +632,6 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
//
// In FIFO is allocated by following rules:
// - IN EP 1 gets FIFO 1, IN EP "n" gets FIFO "n".
// - Offset: allocated so far
// - Size
// - Interrupt is EPSize
// - Bulk/ISO is max(EPSize, remaining-fifo / non-opened-EPIN)
// Check if free space is available
TU_ASSERT(_allocated_fifo_words_tx + fifo_size + usb_otg->GRXFSIZ <= EP_FIFO_SIZE/4);
@ -892,24 +918,6 @@ static void handle_rxflvl_ints(uint8_t rhport, USB_OTG_OUTEndpointTypeDef * out_
TU_BREAKPOINT();
break;
}
// If an OUT EP was closed update (reduce) the RX FIFO size if RX FIFO is empty - since this function handle_rxflvl_ints() gets looped from dcd_int_handler() until RX FIFO is empty it is guaranteed to be entered
if (_rx_ep_closed && (usb_otg->GINTSTS & USB_OTG_GINTSTS_RXFLVL))
{
// Determine largest EP size for RX FIFO
uint16_t sz = xfer_status[0][TUSB_DIR_OUT].max_size;
for (uint8_t cnt = 1; cnt < EP_MAX; cnt++)
{
if (sz < xfer_status[cnt][TUSB_DIR_OUT].max_size) sz = xfer_status[cnt][TUSB_DIR_OUT].max_size;
}
// Update size of RX FIFO
usb_otg->GRXFSIZ = 15 + 2*sz/4 + 2*EP_MAX; // sz was in bytes and is now needed in words
// Disable flag
_rx_ep_closed = false;
}
}
static void handle_epout_ints(uint8_t rhport, USB_OTG_DeviceTypeDef * dev, USB_OTG_OUTEndpointTypeDef * out_ep) {
@ -1074,6 +1082,9 @@ void dcd_int_handler(uint8_t rhport)
int_status = usb_otg->GINTSTS;
} while(int_status & USB_OTG_GINTSTS_RXFLVL);
// Manage RX FIFO size
update_grxfsiz();
usb_otg->GINTMSK |= USB_OTG_GINTMSK_RXFLVLM;
}