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dcd_msp430x5xx: Implement dcd_edpt_open.

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This commit is contained in:
William D. Jones 2019-09-29 00:21:40 -04:00
parent 5d9f833915
commit 529efcc0d2
1 changed files with 71 additions and 3 deletions
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74
src/portable/ti/msp430x5xx/dcd_msp430x5xx.c
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@ -44,7 +44,9 @@ static bool in_isr = false;
uint8_t _setup_packet[8];
typedef struct {
// Xfer control
typedef struct
{
uint8_t * buffer;
uint16_t total_len;
uint16_t queued_len;
@ -55,6 +57,21 @@ typedef struct {
xfer_ctl_t xfer_status[8][2];
#define XFER_CTL_BASE(_ep, _dir) &xfer_status[_ep][_dir]
// Accessing endpoint regs
typedef volatile uint8_t * ep_regs_t;
typedef enum
{
CNF = 0,
BBAX = 1,
BCTX = 2,
BBAY = 5,
BCTY = 6,
SIZXY = 7
} ep_regs_index_t;
#define EP_REGS(epnum, dir) &USBOEPCNF_1 + 64*dir + 8*(epnum - 1)
static void bus_reset(void)
{
@ -197,9 +214,60 @@ void dcd_remote_wakeup(uint8_t rhport)
bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
{
(void) rhport;
(void) desc_edpt;
return false;
uint8_t const epnum = tu_edpt_number(desc_edpt->bEndpointAddress);
uint8_t const dir = tu_edpt_dir(desc_edpt->bEndpointAddress);
// Unsupported endpoint numbers/size or type (Iso not supported. Control
// not supported on nonzero endpoints).
if((desc_edpt->wMaxPacketSize.size > 64) || (epnum > 7) || \
(desc_edpt->bmAttributes.xfer == 0) || \
(desc_edpt->bmAttributes.xfer == 1)) {
return false;
}
// Buffer allocation scheme:
// For simplicity, only single buffer for now, since tinyusb currently waits
// for an xfer to complete before scheduling another one. This means only
// the X buffer is used.
//
// 1904 bytes are available, the max endpoint size supported on msp430 is
// 64 bytes. This is enough RAM for all 14 endpoints enabled _with_ double
// bufferring (64*14*2 = 1792 bytes). Extra RAM exists for triple and higher
// order bufferring, which must be maintained in software.
//
// For simplicity, each endpoint gets a hardcoded 64 byte chunk (regardless
// of actual wMaxPacketSize) whose start address is the following:
// addr = 128 * (epnum - 1) + 64 * dir.
//
// Double buffering equation:
// x_addr = 256 * (epnum - 1) + 128 * dir
// y_addr = x_addr + 64
ep_regs_t ep_regs = EP_REGS(epnum, dir);
uint8_t buf_base = (128 * (epnum - 1) + 64 * dir) >> 3;
// IN and OUT EP registers have the same structure.
ep_regs[SIZXY] = desc_edpt->wMaxPacketSize.size;
ep_regs[BCTX] |= NAK;
ep_regs[BBAX] = buf_base;
ep_regs[CNF] &= ~TOGGLE; // ISO xfers not supported on MSP430, so no need
// to gate DATA0/1 and frame behavior.
ep_regs[CNF] |= (UBME | USBIIE);
USBKEYPID = USBKEY;
if(dir == TUSB_DIR_OUT)
{
USBOEPIE |= (1 << epnum);
}
else
{
USBIEPIE |= (1 << epnum);
}
USBKEYPID = 0;
return true;
}
bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)