rp2040: move flash related functions into separate file from C imports for correct LSP. Fixes #3852

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/machine/machine_rp2040_flash.go

@@ -0,0 +1,97 @@
+//go:build rp2040
+
+package machine
+
+import (
+	"bytes"
+	"unsafe"
+)
+
+// EnterBootloader should perform a system reset in preparation
+// to switch to the bootloader to flash new firmware.
+func EnterBootloader() {
+	enterBootloader()
+}
+
+// compile-time check for ensuring we fulfill BlockDevice interface
+var _ BlockDevice = flashBlockDevice{}
+
+var Flash flashBlockDevice
+
+type flashBlockDevice struct {
+}
+
+// ReadAt reads the given number of bytes from the block device.
+func (f flashBlockDevice) ReadAt(p []byte, off int64) (n int, err error) {
+	if readAddress(off) > FlashDataEnd() {
+		return 0, errFlashCannotReadPastEOF
+	}
+
+	data := unsafe.Slice((*byte)(unsafe.Pointer(readAddress(off))), len(p))
+	copy(p, data)
+
+	return len(p), nil
+}
+
+// WriteAt writes the given number of bytes to the block device.
+// Only word (32 bits) length data can be programmed.
+// If the length of p is not long enough it will be padded with 0xFF bytes.
+// This method assumes that the destination is already erased.
+func (f flashBlockDevice) WriteAt(p []byte, off int64) (n int, err error) {
+	return f.writeAt(p, off)
+}
+
+// Size returns the number of bytes in this block device.
+func (f flashBlockDevice) Size() int64 {
+	return int64(FlashDataEnd() - FlashDataStart())
+}
+
+const writeBlockSize = 1 << 8
+
+// WriteBlockSize returns the block size in which data can be written to
+// memory. It can be used by a client to optimize writes, non-aligned writes
+// should always work correctly.
+func (f flashBlockDevice) WriteBlockSize() int64 {
+	return writeBlockSize
+}
+
+const eraseBlockSizeValue = 1 << 12
+
+func eraseBlockSize() int64 {
+	return eraseBlockSizeValue
+}
+
+// EraseBlockSize returns the smallest erasable area on this particular chip
+// in bytes. This is used for the block size in EraseBlocks.
+func (f flashBlockDevice) EraseBlockSize() int64 {
+	return eraseBlockSize()
+}
+
+// EraseBlocks erases the given number of blocks. An implementation may
+// transparently coalesce ranges of blocks into larger bundles if the chip
+// supports this. The start and len parameters are in block numbers, use
+// EraseBlockSize to map addresses to blocks.
+func (f flashBlockDevice) EraseBlocks(start, length int64) error {
+	return f.eraseBlocks(start, length)
+}
+
+// pad data if needed so it is long enough for correct byte alignment on writes.
+func (f flashBlockDevice) pad(p []byte) []byte {
+	overflow := int64(len(p)) % f.WriteBlockSize()
+	if overflow == 0 {
+		return p
+	}
+
+	padding := bytes.Repeat([]byte{0xff}, int(f.WriteBlockSize()-overflow))
+	return append(p, padding...)
+}
+
+// return the correct address to be used for write
+func writeAddress(off int64) uintptr {
+	return readAddress(off) - uintptr(memoryStart)
+}
+
+// return the correct address to be used for reads
+func readAddress(off int64) uintptr {
+	return FlashDataStart() + uintptr(off)
+}

src/machine/machine_rp2040_rom.go

@@ -3,7 +3,6 @@
 package machine
 
 import (
-	"bytes"
 	"runtime/interrupt"
 	"unsafe"
 )
@@ -136,40 +135,14 @@ void ram_func flash_erase_blocks(uint32_t offset, size_t count)
 */
 import "C"
 
-// EnterBootloader should perform a system reset in preparation
-// to switch to the bootloader to flash new firmware.
-func EnterBootloader() {
+func enterBootloader() {
 	C.reset_usb_boot(0, 0)
 }
 
 // Flash related code
 const memoryStart = C.XIP_BASE // memory start for purpose of erase
 
-// compile-time check for ensuring we fulfill BlockDevice interface
-var _ BlockDevice = flashBlockDevice{}
-
-var Flash flashBlockDevice
-
-type flashBlockDevice struct {
-}
-
-// ReadAt reads the given number of bytes from the block device.
-func (f flashBlockDevice) ReadAt(p []byte, off int64) (n int, err error) {
-	if readAddress(off) > FlashDataEnd() {
-		return 0, errFlashCannotReadPastEOF
-	}
-
-	data := unsafe.Slice((*byte)(unsafe.Pointer(readAddress(off))), len(p))
-	copy(p, data)
-
-	return len(p), nil
-}
-
-// WriteAt writes the given number of bytes to the block device.
-// Only word (32 bits) length data can be programmed.
-// If the length of p is not long enough it will be padded with 0xFF bytes.
-// This method assumes that the destination is already erased.
-func (f flashBlockDevice) WriteAt(p []byte, off int64) (n int, err error) {
+func (f flashBlockDevice) writeAt(p []byte, off int64) (n int, err error) {
 	if writeAddress(off)+uintptr(C.XIP_BASE) > FlashDataEnd() {
 		return 0, errFlashCannotWritePastEOF
 	}
@@ -190,37 +163,7 @@ func (f flashBlockDevice) WriteAt(p []byte, off int64) (n int, err error) {
 	return len(padded), nil
 }
 
-// Size returns the number of bytes in this block device.
-func (f flashBlockDevice) Size() int64 {
-	return int64(FlashDataEnd() - FlashDataStart())
-}
-
-const writeBlockSize = 1 << 8
-
-// WriteBlockSize returns the block size in which data can be written to
-// memory. It can be used by a client to optimize writes, non-aligned writes
-// should always work correctly.
-func (f flashBlockDevice) WriteBlockSize() int64 {
-	return writeBlockSize
-}
-
-const eraseBlockSizeValue = 1 << 12
-
-func eraseBlockSize() int64 {
-	return eraseBlockSizeValue
-}
-
-// EraseBlockSize returns the smallest erasable area on this particular chip
-// in bytes. This is used for the block size in EraseBlocks.
-func (f flashBlockDevice) EraseBlockSize() int64 {
-	return eraseBlockSize()
-}
-
-// EraseBlocks erases the given number of blocks. An implementation may
-// transparently coalesce ranges of blocks into larger bundles if the chip
-// supports this. The start and len parameters are in block numbers, use
-// EraseBlockSize to map addresses to blocks.
-func (f flashBlockDevice) EraseBlocks(start, length int64) error {
+func (f flashBlockDevice) eraseBlocks(start, length int64) error {
 	address := writeAddress(start * f.EraseBlockSize())
 	if address+uintptr(C.XIP_BASE) > FlashDataEnd() {
 		return errFlashCannotErasePastEOF
@@ -233,24 +176,3 @@ func (f flashBlockDevice) EraseBlocks(start, length int64) error {
 
 	return nil
 }
-
-// pad data if needed so it is long enough for correct byte alignment on writes.
-func (f flashBlockDevice) pad(p []byte) []byte {
-	overflow := int64(len(p)) % f.WriteBlockSize()
-	if overflow == 0 {
-		return p
-	}
-
-	padding := bytes.Repeat([]byte{0xff}, int(f.WriteBlockSize()-overflow))
-	return append(p, padding...)
-}
-
-// return the correct address to be used for write
-func writeAddress(off int64) uintptr {
-	return readAddress(off) - uintptr(C.XIP_BASE)
-}
-
-// return the correct address to be used for reads
-func readAddress(off int64) uintptr {
-	return FlashDataStart() + uintptr(off)
-}