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Raise STM32F1 UART IRQ Priority, add error handling (#19301)

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(Error handling for Overrun, Framing and Parity.)
This commit is contained in:
Victor Oliveira 2020-09-10 00:46:50 -03:00 committed by Scott Lahteine
parent 13f2915b65
commit 8393c6a63d
3 changed files with 52 additions and 24 deletions
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6
Marlin/src/HAL/STM32/MarlinSerial.cpp
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@ -55,10 +55,8 @@
void MarlinSerial::begin(unsigned long baud, uint8_t config) {
HardwareSerial::begin(baud, config);
// replace the IRQ callback with the one we have defined
#if ENABLED(EMERGENCY_PARSER)
_serial.rx_callback = _rx_callback;
#endif
// Replace the IRQ callback with the one we have defined
TERN_(EMERGENCY_PARSER, _serial.rx_callback = _rx_callback);
}
// This function is Copyright (c) 2006 Nicholas Zambetti.

55
Marlin/src/HAL/STM32F1/MarlinSerial.cpp
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@ -29,28 +29,43 @@
// Copied from ~/.platformio/packages/framework-arduinoststm32-maple/STM32F1/system/libmaple/usart_private.h
// Changed to handle Emergency Parser
static inline __always_inline void my_usart_irq(ring_buffer *rb, ring_buffer *wb, usart_reg_map *regs, MarlinSerial &serial) {
/* Handle RXNEIE and TXEIE interrupts.
* RXNE signifies availability of a byte in DR.
*
* See table 198 (sec 27.4, p809) in STM document RM0008 rev 15.
* We enable RXNEIE.
*/
if ((regs->CR1 & USART_CR1_RXNEIE) && (regs->SR & USART_SR_RXNE)) {
uint8_t c = (uint8)regs->DR;
#ifdef USART_SAFE_INSERT
// If the buffer is full and the user defines USART_SAFE_INSERT,
// ignore new bytes.
rb_safe_insert(rb, c);
#else
// By default, push bytes around in the ring buffer.
rb_push_insert(rb, c);
#endif
#if ENABLED(EMERGENCY_PARSER)
emergency_parser.update(serial.emergency_state, c);
#endif
/* Handle RXNEIE and TXEIE interrupts.
* RXNE signifies availability of a byte in DR.
*
* See table 198 (sec 27.4, p809) in STM document RM0008 rev 15.
* We enable RXNEIE.
*/
uint32_t srflags = regs->SR, cr1its = regs->CR1;
if ((cr1its & USART_CR1_RXNEIE) && (srflags & USART_SR_RXNE)) {
if (srflags & USART_SR_FE || srflags & USART_SR_PE ) {
// framing error or parity error
regs->DR; // Read and throw away the data, which also clears FE and PE
}
else {
uint8_t c = (uint8)regs->DR;
#ifdef USART_SAFE_INSERT
// If the buffer is full and the user defines USART_SAFE_INSERT,
// ignore new bytes.
rb_safe_insert(rb, c);
#else
// By default, push bytes around in the ring buffer.
rb_push_insert(rb, c);
#endif
#if ENABLED(EMERGENCY_PARSER)
emergency_parser.update(serial.emergency_state, c);
#endif
}
}
else if (srflags & USART_SR_ORE) {
// overrun and empty data, just do a dummy read to clear ORE
// and prevent a raise condition where a continous interrupt stream (due to ORE set) occurs
// (see chapter "Overrun error" ) in STM32 reference manual
regs->DR;
}
// TXE signifies readiness to send a byte to DR.
if ((regs->CR1 & USART_CR1_TXEIE) && (regs->SR & USART_SR_TXE)) {
if ((cr1its & USART_CR1_TXEIE) && (srflags & USART_SR_TXE)) {
if (!rb_is_empty(wb))
regs->DR=rb_remove(wb);
else

15
Marlin/src/HAL/STM32F1/MarlinSerial.h
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@ -22,6 +22,7 @@
#pragma once
#include <HardwareSerial.h>
#include <libmaple/usart.h>
#include <WString.h>
#include "../../inc/MarlinConfigPre.h"
@ -29,6 +30,8 @@
#include "../../feature/e_parser.h"
#endif
#define UART_IRQ_PRIO 1
class MarlinSerial : public HardwareSerial {
public:
MarlinSerial(struct usart_dev *usart_device, uint8 tx_pin, uint8 rx_pin) :
@ -38,6 +41,18 @@ public:
#endif
{ }
#ifdef UART_IRQ_PRIO
// shadow the parent methods to set irq priority after the begin
void begin(uint32 baud) {
MarlinSerial::begin(baud, SERIAL_8N1);
}
void begin(uint32 baud, uint8_t config) {
HardwareSerial::begin(baud, config);
nvic_irq_set_priority(c_dev()->irq_num, UART_IRQ_PRIO);
}
#endif
#if ENABLED(EMERGENCY_PARSER)
EmergencyParser::State emergency_state;
#endif