/* | |
FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 Richard Barry. | |
This file is part of the FreeRTOS.org distribution. | |
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*************************************************************************** | |
*************************************************************************** | |
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Please ensure to read the configuration and relevant port sections of the | |
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*/ | |
/* | |
BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0. | |
*/ | |
/* Library includes. */ | |
#include "75x_uart.h" | |
#include "75x_gpio.h" | |
#include "75x_eic.h" | |
#include "75x_mrcc.h" | |
/* Scheduler includes. */ | |
#include "FreeRTOS.h" | |
#include "queue.h" | |
/* Demo application includes. */ | |
#include "serial.h" | |
#define serINVALID_QUEUE ( ( xQueueHandle ) 0 ) | |
#define serNO_BLOCK ( ( portTickType ) 0 ) | |
/*-----------------------------------------------------------*/ | |
/* Queues used to hold received characters, and characters waiting to be | |
transmitted. */ | |
static xQueueHandle xRxedChars; | |
static xQueueHandle xCharsForTx; | |
static volatile portBASE_TYPE xQueueEmpty = pdTRUE; | |
/*-----------------------------------------------------------*/ | |
/* The interrupt service routine - called from the assembly entry point. */ | |
__arm void vSerialISR( void ); | |
/*-----------------------------------------------------------*/ | |
/* | |
* See the serial2.h header file. | |
*/ | |
xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
{ | |
xComPortHandle xReturn; | |
UART_InitTypeDef UART_InitStructure; | |
GPIO_InitTypeDef GPIO_InitStructure; | |
EIC_IRQInitTypeDef EIC_IRQInitStructure; | |
/* Create the queues used to hold Rx and Tx characters. */ | |
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); | |
xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); | |
/* If the queues were created correctly then setup the serial port | |
hardware. */ | |
if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) ) | |
{ | |
portENTER_CRITICAL(); | |
{ | |
/* Enable the UART0 Clock. */ | |
MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE ); | |
/* Configure the UART0_Tx as alternate function */ | |
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; | |
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; | |
GPIO_Init(GPIO0, &GPIO_InitStructure); | |
/* Configure the UART0_Rx as input floating */ | |
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; | |
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; | |
GPIO_Init(GPIO0, &GPIO_InitStructure); | |
/* Configure UART0. */ | |
UART_InitStructure.UART_WordLength = UART_WordLength_8D; | |
UART_InitStructure.UART_StopBits = UART_StopBits_1; | |
UART_InitStructure.UART_Parity = UART_Parity_No; | |
UART_InitStructure.UART_BaudRate = ulWantedBaud; | |
UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None; | |
UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx; | |
UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */ | |
UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */ | |
UART_Init(UART0, &UART_InitStructure); | |
/* Enable the UART0 */ | |
UART_Cmd(UART0, ENABLE); | |
/* Configure the IEC for the UART interrupts. */ | |
EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE; | |
EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel; | |
EIC_IRQInitStructure.EIC_IRQChannelPriority = 1; | |
EIC_IRQInit(&EIC_IRQInitStructure); | |
xQueueEmpty = pdTRUE; | |
UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE ); | |
} | |
portEXIT_CRITICAL(); | |
} | |
else | |
{ | |
xReturn = ( xComPortHandle ) 0; | |
} | |
/* This demo file only supports a single port but we have to return | |
something to comply with the standard demo header file. */ | |
return xReturn; | |
} | |
/*-----------------------------------------------------------*/ | |
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime ) | |
{ | |
/* The port handle is not required as this driver only supports one port. */ | |
( void ) pxPort; | |
/* Get the next character from the buffer. Return false if no characters | |
are available, or arrive before xBlockTime expires. */ | |
if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) ) | |
{ | |
return pdTRUE; | |
} | |
else | |
{ | |
return pdFALSE; | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength ) | |
{ | |
signed portCHAR *pxNext; | |
/* A couple of parameters that this port does not use. */ | |
( void ) usStringLength; | |
( void ) pxPort; | |
/* NOTE: This implementation does not handle the queue being full as no | |
block time is used! */ | |
/* The port handle is not required as this driver only supports UART0. */ | |
( void ) pxPort; | |
/* Send each character in the string, one at a time. */ | |
pxNext = ( signed portCHAR * ) pcString; | |
while( *pxNext ) | |
{ | |
xSerialPutChar( pxPort, *pxNext, serNO_BLOCK ); | |
pxNext++; | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime ) | |
{ | |
portBASE_TYPE xReturn; | |
/* Place the character in the queue of characters to be transmitted. */ | |
portENTER_CRITICAL(); | |
{ | |
if( xQueueEmpty == pdTRUE ) | |
{ | |
UART0->DR = cOutChar; | |
xReturn = pdPASS; | |
} | |
else | |
{ | |
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) | |
{ | |
xReturn = pdFAIL; | |
} | |
else | |
{ | |
xReturn = pdPASS; | |
} | |
} | |
xQueueEmpty = pdFALSE; | |
} | |
portEXIT_CRITICAL(); | |
return xReturn; | |
} | |
/*-----------------------------------------------------------*/ | |
void vSerialClose( xComPortHandle xPort ) | |
{ | |
/* Not supported as not required by the demo application. */ | |
} | |
/*-----------------------------------------------------------*/ | |
__arm void vSerialISR( void ) | |
{ | |
signed portCHAR cChar; | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
do | |
{ | |
if( UART0->MIS & UART_IT_Transmit ) | |
{ | |
/* The interrupt was caused by the THR becoming empty. Are there any | |
more characters to transmit? */ | |
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE ) | |
{ | |
/* A character was retrieved from the queue so can be sent to the | |
THR now. */ | |
UART0->DR = cChar; | |
} | |
else | |
{ | |
xQueueEmpty = pdTRUE; | |
} | |
UART_ClearITPendingBit( UART0, UART_IT_Transmit ); | |
} | |
if( UART0->MIS & UART_IT_Receive ) | |
{ | |
/* The interrupt was caused by a character being received. Grab the | |
character from the RHR and place it in the queue of received | |
characters. */ | |
cChar = UART0->DR; | |
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); | |
UART_ClearITPendingBit( UART0, UART_IT_Receive ); | |
} | |
} while( UART0->MIS ); | |
/* If a task was woken by either a character being received or a character | |
being transmitted then we may need to switch to another task. */ | |
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); | |
} | |