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@@ -126,6 +126,7 @@ uint8_t optiboot_w25x20cl_enter()
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}
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selectedSerialPort = 0; //switch to Serial0
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MYSERIAL.flush(); //clear RX buffer
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+ int SerialHead = rx_buffer.head;
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// Send the initial magic string.
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while (ptr != end)
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putch(pgm_read_byte(ptr ++));
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@@ -143,7 +144,6 @@ uint8_t optiboot_w25x20cl_enter()
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// With the volatile keyword the compiler generates exactly the same code as without it with only one difference:
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// the last brne instruction jumps onto the (*rx_head == SerialHead) check and NOT onto the wdr instruction bypassing the check.
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volatile int *rx_head = &rx_buffer.head;
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- int SerialHead = rx_buffer.head;
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while (*rx_head == SerialHead) {
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wdt_reset();
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if ( --boot_timer == 0) {
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