tinygo-org/tinygo
1
0
Fork 0
mirror of https://github.com/tinygo-org/tinygo.git synced 2026-08-12 15:03:41 +00:00
Code Issues Packages Projects Releases 6 Wiki Activity

usb: remove allocs in ISR

Browse Source
This commit is contained in:
Kenneth Bell
2022-10-05 16:18:56 +01:00
committed by Ron Evans
parent 7e9d84777e
commit 8f33721b88
3 changed files with 47 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/machine/usb.go
+22 -11
View File
@@ -72,6 +72,13 @@ var udd_ep_in_cache_buffer [7][64]uint8
//go:align 4
var udd_ep_out_cache_buffer [7][64]uint8
// usb_trans_buffer max size is 255 since that is max size
// for a descriptor (bLength is 1 byte), and the biggest use
// for this buffer is to transmit string descriptors. If
// this buffer is used for new purposes in future the length
// must be revisited.
var usb_trans_buffer [255]uint8
var (
usbTxHandler [usb.NumberOfEndpoints]func()
usbRxHandler [usb.NumberOfEndpoints]func([]byte)
@@ -113,16 +120,19 @@ func sendDescriptor(setup usb.Setup) {
case usb.STRING_DESCRIPTOR_TYPE:
switch setup.WValueL {
case 0:
b := []byte{0x04, 0x03, 0x09, 0x04}
sendUSBPacket(0, b, setup.WLength)
usb_trans_buffer[0] = 0x04
usb_trans_buffer[1] = 0x03
usb_trans_buffer[2] = 0x09
usb_trans_buffer[3] = 0x04
sendUSBPacket(0, usb_trans_buffer[:4], setup.WLength)
case usb.IPRODUCT:
b := make([]byte, (len(usb_STRING_PRODUCT)<<1)+2)
b := usb_trans_buffer[:(len(usb_STRING_PRODUCT)<<1)+2]
strToUTF16LEDescriptor(usb_STRING_PRODUCT, b)
sendUSBPacket(0, b, setup.WLength)
case usb.IMANUFACTURER:
b := make([]byte, (len(usb_STRING_MANUFACTURER)<<1)+2)
b := usb_trans_buffer[:(len(usb_STRING_MANUFACTURER)<<1)+2]
strToUTF16LEDescriptor(usb_STRING_MANUFACTURER, b)
sendUSBPacket(0, b, setup.WLength)
@@ -149,15 +159,16 @@ func sendDescriptor(setup usb.Setup) {
func handleStandardSetup(setup usb.Setup) bool {
switch setup.BRequest {
case usb.GET_STATUS:
buf := []byte{0, 0}
usb_trans_buffer[0] = 0
usb_trans_buffer[1] = 0
if setup.BmRequestType != 0 { // endpoint
if isEndpointHalt {
buf[0] = 1
usb_trans_buffer[0] = 1
}
}
sendUSBPacket(0, buf, setup.WLength)
sendUSBPacket(0, usb_trans_buffer[:2], setup.WLength)
return true
case usb.CLEAR_FEATURE:
@@ -189,8 +200,8 @@ func handleStandardSetup(setup usb.Setup) bool {
return false
case usb.GET_CONFIGURATION:
buff := []byte{usbConfiguration}
sendUSBPacket(0, buff, setup.WLength)
usb_trans_buffer[0] = usbConfiguration
sendUSBPacket(0, usb_trans_buffer[:1], setup.WLength)
return true
case usb.SET_CONFIGURATION:
@@ -208,8 +219,8 @@ func handleStandardSetup(setup usb.Setup) bool {
}
case usb.GET_INTERFACE:
buff := []byte{usbSetInterface}
sendUSBPacket(0, buff, setup.WLength)
usb_trans_buffer[0] = usbSetInterface
sendUSBPacket(0, usb_trans_buffer[:1], setup.WLength)
return true
case usb.SET_INTERFACE: