Split writeSRAM to show progress

src/gowin.cpp

@@ -534,8 +534,21 @@ bool Gowin::writeSRAM(const uint8_t *data, int length)
 	send_command(CONFIG_ENABLE); // config enable
 	send_command(INIT_ADDR); // address initialize
 	send_command(XFER_WRITE); // transfer configuration data
-
-	_jtag->shiftDR(data, NULL, length);
+	int remains = length;
+	const uint8_t *ptr = data;
+	int blength = length / 8;
+	while (remains) {
+		int chunk = (length / 10) & ~3; // round to byte boundary
+		Jtag::tapState_t next = Jtag::SHIFT_DR;
+		if (remains < chunk) {
+			chunk = remains;
+			next = Jtag::RUN_TEST_IDLE;
+		}
+		_jtag->shiftDR(ptr, NULL, chunk, next);
+		ptr += chunk / 8; // in bytes
+		remains -= chunk;
+		progress.display(ptr - data);
+	}
 	progress.done();
 	send_command(0x0a);
 	uint32_t checksum = static_cast<FsParser *>(_fs)->checksum();