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[Core] Stabilize RP2040 Half-duplex PIO split comms take 2 #18421

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Sep 20, 2022
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[Core] Stabilize RP2040 Half-duplex PIO split comms take 2 #18421

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17 changes: 2 additions & 15 deletions platforms/chibios/drivers/vendor/RP/RP2040/serial_vendor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -140,9 +140,8 @@ void pio_serve_interrupt(void) {
// strength is chosen because the transmitting side must still be able to drive
// the signal low. With this configuration the rise times are fast enough and
// the generated low level with 360mV will generate a logical zero.
static inline void enter_rx_state(void) {
static void __no_inline_not_in_flash_func(enter_rx_state)(void) {
osalSysLock();
nvicEnableVector(RP_USBCTRL_IRQ_NUMBER, RP_IRQ_USB0_PRIORITY);
// Wait for the transmitting state machines FIFO to run empty. At this point
// the last byte has been pulled from the transmitting state machines FIFO
// into the output shift register. We have to wait a tiny bit more until
Expand All @@ -162,11 +161,8 @@ static inline void enter_rx_state(void) {
osalSysUnlock();
}

static inline void leave_rx_state(void) {
static void __no_inline_not_in_flash_func(leave_rx_state)(void) {
osalSysLock();
// We don't want to be interrupted by frequent (1KHz) USB interrupts while
// doing our timing critical sending operation.
nvicDisableVector(RP_USBCTRL_IRQ_NUMBER);
// In Half-duplex operation the tx pin dual-functions as sender and
// receiver. To not receive the data we will send, we disable the receiving
// state machine.
Expand Down Expand Up @@ -198,22 +194,13 @@ static inline msg_t sync_tx(sysinterval_t timeout) {
msg_t msg = MSG_OK;
osalSysLock();
while (pio_sm_is_tx_fifo_full(pio, tx_state_machine)) {
#if !defined(SERIAL_USART_FULL_DUPLEX)
// Enable USB interrupts again, because we might sleep for a long time
// here and don't want to be disconnected from the host.
nvicEnableVector(RP_USBCTRL_IRQ_NUMBER, RP_IRQ_USB0_PRIORITY);
#endif
pio_set_irq0_source_enabled(pio, pis_sm0_tx_fifo_not_full + tx_state_machine, true);
msg = osalThreadSuspendTimeoutS(&tx_thread, timeout);
if (msg < MSG_OK) {
pio_set_irq0_source_enabled(pio, pis_sm0_tx_fifo_not_full + tx_state_machine, false);
break;
}
}
#if !defined(SERIAL_USART_FULL_DUPLEX)
// Entering timing critical territory again.
nvicDisableVector(RP_USBCTRL_IRQ_NUMBER);
#endif
osalSysUnlock();
return msg;
}
Expand Down