Merge upstream changes from Marlin 2.1.1
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@@ -406,7 +406,7 @@ size_t MarlinSerial<Cfg>::write(const uint8_t c) {
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const uint8_t i = (tx_buffer.head + 1) & (Cfg::TX_SIZE - 1);
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// If global interrupts are disabled (as the result of being called from an ISR)...
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if (!ISRS_ENABLED()) {
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if (!hal.isr_state()) {
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// Make room by polling if it is possible to transmit, and do so!
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while (i == tx_buffer.tail) {
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@@ -454,7 +454,7 @@ void MarlinSerial<Cfg>::flushTX() {
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if (!_written) return;
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// If global interrupts are disabled (as the result of being called from an ISR)...
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if (!ISRS_ENABLED()) {
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if (!hal.isr_state()) {
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// Wait until everything was transmitted - We must do polling, as interrupts are disabled
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while (tx_buffer.head != tx_buffer.tail || !(HWUART->UART_SR & UART_SR_TXEMPTY)) {
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