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MarlinFirmware/Marlin/src/HAL/HAL_LPC1768/HardwareSerial.cpp

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/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef TARGET_LPC1768
#include "../../inc/MarlinConfig.h"
#include "HardwareSerial.h"
#if SERIAL_PORT == 0 || SERIAL_PORT_2 == 0
HardwareSerial Serial = HardwareSerial(LPC_UART0);
#elif SERIAL_PORT == 1 || SERIAL_PORT_2 == 1
HardwareSerial Serial1 = HardwareSerial((LPC_UART_TypeDef *) LPC_UART1);
#elif SERIAL_PORT == 2 || SERIAL_PORT_2 == 2
HardwareSerial Serial2 = HardwareSerial(LPC_UART2);
#elif SERIAL_PORT == 3 || SERIAL_PORT_2 == 3
HardwareSerial Serial3 = HardwareSerial(LPC_UART3);
#endif
void HardwareSerial::begin(uint32_t baudrate) {
UART_CFG_Type UARTConfigStruct;
PINSEL_CFG_Type PinCfg;
UART_FIFO_CFG_Type FIFOConfig;
if (UARTx == LPC_UART0) {
// Initialize UART0 pin connect
PinCfg.Funcnum = 1;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
PinCfg.Pinnum = 2;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 3;
PINSEL_ConfigPin(&PinCfg);
} else if ((LPC_UART1_TypeDef *) UARTx == LPC_UART1) {
// Initialize UART1 pin connect
PinCfg.Funcnum = 1;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
PinCfg.Pinnum = 15;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 16;
PINSEL_ConfigPin(&PinCfg);
} else if (UARTx == LPC_UART2) {
// Initialize UART2 pin connect
PinCfg.Funcnum = 1;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
PinCfg.Pinnum = 10;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 11;
PINSEL_ConfigPin(&PinCfg);
} else if (UARTx == LPC_UART3) {
// Initialize UART2 pin connect
PinCfg.Funcnum = 1;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
PinCfg.Pinnum = 0;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 1;
PINSEL_ConfigPin(&PinCfg);
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}
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/* Initialize UART Configuration parameter structure to default state:
* Baudrate = 9600bps
* 8 data bit
* 1 Stop bit
* None parity
*/
UART_ConfigStructInit(&UARTConfigStruct);
// Re-configure baudrate
UARTConfigStruct.Baud_rate = baudrate;
// Initialize eripheral with given to corresponding parameter
UART_Init(UARTx, &UARTConfigStruct);
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// Enable and reset the TX and RX FIFOs
UART_FIFOConfigStructInit(&FIFOConfig);
UART_FIFOConfig(UARTx, &FIFOConfig);
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// Enable UART Transmit
UART_TxCmd(UARTx, ENABLE);
// Configure Interrupts
UART_IntConfig(UARTx, UART_INTCFG_RBR, ENABLE);
UART_IntConfig(UARTx, UART_INTCFG_RLS, ENABLE);
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if (UARTx == LPC_UART0) NVIC_EnableIRQ(UART0_IRQn);
else if ((LPC_UART1_TypeDef *) UARTx == LPC_UART1) NVIC_EnableIRQ(UART1_IRQn);
else if (UARTx == LPC_UART2) NVIC_EnableIRQ(UART2_IRQn);
else if (UARTx == LPC_UART3) NVIC_EnableIRQ(UART3_IRQn);
RxQueueWritePos = RxQueueReadPos = 0;
#if TX_BUFFER_SIZE > 0
TxQueueWritePos = TxQueueReadPos = 0;
#endif
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}
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int HardwareSerial::peek() {
int byte = -1;
// Temporarily lock out UART receive interrupts during this read so the UART receive
// interrupt won't cause problems with the index values
UART_IntConfig(UARTx, UART_INTCFG_RBR, DISABLE);
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if (RxQueueReadPos != RxQueueWritePos)
byte = RxBuffer[RxQueueReadPos];
// Re-enable UART interrupts
UART_IntConfig(UARTx, UART_INTCFG_RBR, ENABLE);
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return byte;
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}
int HardwareSerial::read() {
int byte = -1;
// Temporarily lock out UART receive interrupts during this read so the UART receive
// interrupt won't cause problems with the index values
UART_IntConfig(UARTx, UART_INTCFG_RBR, DISABLE);
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if (RxQueueReadPos != RxQueueWritePos) {
byte = RxBuffer[RxQueueReadPos];
RxQueueReadPos = (RxQueueReadPos + 1) % RX_BUFFER_SIZE;
}
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// Re-enable UART interrupts
UART_IntConfig(UARTx, UART_INTCFG_RBR, ENABLE);
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return byte;
}
size_t HardwareSerial::write(uint8_t send) {
#if TX_BUFFER_SIZE > 0
size_t bytes = 0;
uint32_t fifolvl = 0;
// If the Tx Buffer is full, wait for space to clear
if ((TxQueueWritePos+1) % TX_BUFFER_SIZE == TxQueueReadPos) flushTX();
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// Temporarily lock out UART transmit interrupts during this read so the UART transmit interrupt won't
// cause problems with the index values
UART_IntConfig(UARTx, UART_INTCFG_THRE, DISABLE);
// LPC17xx.h incorrectly defines FIFOLVL as a uint8_t, when it's actually a 32-bit register
if ((LPC_UART1_TypeDef *) UARTx == LPC_UART1) {
fifolvl = *(reinterpret_cast<volatile uint32_t *>(&((LPC_UART1_TypeDef *) UARTx)->FIFOLVL));
} else fifolvl = *(reinterpret_cast<volatile uint32_t *>(&UARTx->FIFOLVL));
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// If the queue is empty and there's space in the FIFO, immediately send the byte
if (TxQueueWritePos == TxQueueReadPos && fifolvl < UART_TX_FIFO_SIZE) {
bytes = UART_Send(UARTx, &send, 1, BLOCKING);
}
// Otherwiise, write the byte to the transmit buffer
else if ((TxQueueWritePos+1) % TX_BUFFER_SIZE != TxQueueReadPos) {
TxBuffer[TxQueueWritePos] = send;
TxQueueWritePos = (TxQueueWritePos+1) % TX_BUFFER_SIZE;
bytes++;
}
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// Re-enable the TX Interrupt
UART_IntConfig(UARTx, UART_INTCFG_THRE, ENABLE);
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return bytes;
#else
return UART_Send(UARTx, &send, 1, BLOCKING);
#endif
}
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#if TX_BUFFER_SIZE > 0
void HardwareSerial::flushTX() {
// Wait for the tx buffer and FIFO to drain
while (TxQueueWritePos != TxQueueReadPos && UART_CheckBusy(UARTx) == SET);
}
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#endif
int HardwareSerial::available() {
return (RxQueueWritePos + RX_BUFFER_SIZE - RxQueueReadPos) % RX_BUFFER_SIZE;
}
void HardwareSerial::flush() {
RxQueueWritePos = 0;
RxQueueReadPos = 0;
}
void HardwareSerial::printf(const char *format, ...) {
char RxBuffer[256];
va_list vArgs;
va_start(vArgs, format);
int length = vsnprintf(RxBuffer, 256, format, vArgs);
va_end(vArgs);
if (length > 0 && length < 256) {
for (int i = 0; i < length; ++i)
write(RxBuffer[i]);
}
}
void HardwareSerial::IRQHandler() {
uint32_t IIRValue;
uint8_t LSRValue, byte;
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IIRValue = UART_GetIntId(UARTx);
IIRValue &= UART_IIR_INTID_MASK; // check bit 1~3, interrupt identification
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// Receive Line Status
if (IIRValue == UART_IIR_INTID_RLS) {
LSRValue = UART_GetLineStatus(UARTx);
// Receive Line Status
if (LSRValue & (UART_LSR_OE | UART_LSR_PE | UART_LSR_FE | UART_LSR_RXFE | UART_LSR_BI)) {
// There are errors or break interrupt
// Read LSR will clear the interrupt
Status = LSRValue;
byte = UART_ReceiveByte(UARTx); // Dummy read on RX to clear interrupt, then bail out
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return;
}
}
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// Receive Data Available
if (IIRValue == UART_IIR_INTID_RDA) {
// Clear the FIFO
while (UART_Receive(UARTx, &byte, 1, NONE_BLOCKING)) {
if ((RxQueueWritePos + 1) % RX_BUFFER_SIZE != RxQueueReadPos) {
RxBuffer[RxQueueWritePos] = byte;
RxQueueWritePos = (RxQueueWritePos + 1) % RX_BUFFER_SIZE;
} else
break;
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}
// Character timeout indicator
} else if (IIRValue == UART_IIR_INTID_CTI) {
// Character Time-out indicator
Status |= 0x100; // Bit 9 as the CTI error
}
#if TX_BUFFER_SIZE > 0
if (IIRValue == UART_IIR_INTID_THRE) {
// Disable THRE interrupt
UART_IntConfig(UARTx, UART_INTCFG_THRE, DISABLE);
// Wait for FIFO buffer empty
while (UART_CheckBusy(UARTx) == SET);
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// Transfer up to UART_TX_FIFO_SIZE bytes of data
for (int i = 0; i < UART_TX_FIFO_SIZE && TxQueueWritePos != TxQueueReadPos; i++) {
// Move a piece of data into the transmit FIFO
if (UART_Send(UARTx, &TxBuffer[TxQueueReadPos], 1, NONE_BLOCKING)) {
TxQueueReadPos = (TxQueueReadPos+1) % TX_BUFFER_SIZE;
} else break;
}
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// If there is no more data to send, disable the transmit interrupt - else enable it or keep it enabled
if (TxQueueWritePos == TxQueueReadPos) {
UART_IntConfig(UARTx, UART_INTCFG_THRE, DISABLE);
} else UART_IntConfig(UARTx, UART_INTCFG_THRE, ENABLE);
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}
#endif
}
#ifdef __cplusplus
extern "C" {
#endif
void UART0_IRQHandler(void) {
#if SERIAL_PORT == 0 || SERIAL_PORT_2 == 0
Serial.IRQHandler();
#endif
}
void UART1_IRQHandler(void) {
#if SERIAL_PORT == 1 || SERIAL_PORT_2 == 1
Serial1.IRQHandler();
#endif
}
void UART2_IRQHandler(void) {
#if SERIAL_PORT == 2 || SERIAL_PORT_2 == 2
Serial2.IRQHandler();
#endif
}
void UART3_IRQHandler(void) {
#if SERIAL_PORT == 3 || SERIAL_PORT_2 == 3
Serial3.IRQHandler();
#endif
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}
#ifdef __cplusplus
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}
#endif
#endif // TARGET_LPC1768