1 files changed, 77 insertions, 0 deletions
diff --git a/flash/uart_boot/flash.c b/flash/uart_boot/flash.c
new file mode 100644
index 0000000..f27bb7e
--- /dev/null
+++ b/flash/uart_boot/flash.c
@@ -0,0 +1,77 @@
+// flash.cpp : higher-level functions for flashing the chip
+//
+
+#include "scalar_types.h" // (U)INT8/16/32
+#include "Uart.h" // platform abstraction for UART
+#include "client.h" // client functions
+
+
+// read the manufacturer and device ID
+int ReadID(tUartHandle serial_handle, UINT32 base, UINT8* pManufacturerID, UINT8* pDeviceID)
+{
+	base &= 0xFFF80000; // round down to 512k align, to make shure
+
+	WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
+	WriteByte(serial_handle, base + 0x2AAA, 0x55);
+	WriteByte(serial_handle, base + 0x5555, 0x90); // ID command
+	SLEEP(20); // Atmel wants 20ms pause here
+
+	*pManufacturerID = ReadByte(serial_handle, base + 0);
+	*pDeviceID		 = ReadByte(serial_handle, base + 1);
+
+	WriteByte(serial_handle, base + 0, 0xF0);	// reset flash (back to normal read mode)
+	SLEEP(20); // Atmel wants 20ms pause here
+
+	return 0;
+}
+
+
+// erase the sector which contains the given address
+int EraseSector(tUartHandle serial_handle, UINT32 address)
+{
+	UINT32 base = address & 0xFFF80000; // round down to 512k align
+	
+	WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
+	WriteByte(serial_handle, base + 0x2AAA, 0x55);
+	WriteByte(serial_handle, base + 0x5555, 0x80); // eraze command
+	WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
+	WriteByte(serial_handle, base + 0x2AAA, 0x55);
+	WriteByte(serial_handle, address, 0x30); // eraze the sector
+	SLEEP(25); // sector eraze time: 25ms
+
+	return 0;
+}
+
+
+// erase the whole flash
+int EraseChip(tUartHandle serial_handle, UINT32 base)
+{
+	base &= 0xFFF80000; // round down to 512k align, to make shure
+	
+	WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
+	WriteByte(serial_handle, base + 0x2AAA, 0x55);
+	WriteByte(serial_handle, base + 0x5555, 0x80); // eraze command
+	WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
+	WriteByte(serial_handle, base + 0x2AAA, 0x55);
+	WriteByte(serial_handle, base + 0x5555, 0x10); // chip eraze command
+	SLEEP(100); // chip eraze time: 100ms
+
+	return 0;
+}
+
+
+// program a bunch of bytes "by hand"
+int ProgramBytes(tUartHandle serial_handle, UINT32 address, UINT8* pData, UINT32 size)
+{
+	UINT32 base = address & 0xFFF80000; // round down to 512k align
+
+	while (size--)
+	{
+		WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
+		WriteByte(serial_handle, base + 0x2AAA, 0x55);
+		WriteByte(serial_handle, base + 0x5555, 0xA0); // byte program command
+		WriteByte(serial_handle, address++, *pData++);
+		// UART protocol is slow enough such that I don't have to wait 20us here
+	}
+	return 0;
+}
+\ No newline at end of file