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Stabilize Half-duplex PIO split comms (#17612)

master
Stefan Kerkmann 2022-07-11 13:05:04 +02:00 committed by GitHub
parent 35d78aa8a4
commit 0348071810
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 3 deletions
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20
platforms/chibios/drivers/vendor/RP/RP2040/serial_vendor.c vendored
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@ -142,6 +142,7 @@ void pio_serve_interrupt(void) {
// the generated low level with 360mV will generate a logical zero.
static inline void 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
@ -163,6 +164,9 @@ static inline void enter_rx_state(void) {
static inline void 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.
@ -194,12 +198,21 @@ 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) {
break;
}
}
#if !defined(SERIAL_USART_FULL_DUPLEX)
// Entering timing critical territory again.
nvicDisableVector(RP_USBCTRL_IRQ_NUMBER);
#endif
osalSysUnlock();
return msg;
}
@ -412,11 +425,12 @@ static inline void pio_init(pin_t tx_pin, pin_t rx_pin) {
pio_set_irq0_source_enabled(pio, pis_sm0_tx_fifo_not_full + tx_state_machine, true);
pio_set_irq0_source_enabled(pio, pis_interrupt0, true);
// Enable PIO specific interrupt vector
// Enable PIO specific interrupt vector, as the pio implementation is timing
// critical we use the highest possible priority.
#if defined(SERIAL_PIO_USE_PIO1)
nvicEnableVector(RP_PIO1_IRQ_0_NUMBER, RP_IRQ_UART0_PRIORITY);
nvicEnableVector(RP_PIO1_IRQ_0_NUMBER, CORTEX_MAX_KERNEL_PRIORITY);
#else
nvicEnableVector(RP_PIO0_IRQ_0_NUMBER, RP_IRQ_UART0_PRIORITY);
nvicEnableVector(RP_PIO0_IRQ_0_NUMBER, CORTEX_MAX_KERNEL_PRIORITY);
#endif
enter_rx_state();