You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
228 lines
7.3 KiB
C
228 lines
7.3 KiB
C
/*
|
|
* FreeRTOS Kernel V10.0.1
|
|
* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
* this software and associated documentation files (the "Software"), to deal in
|
|
* the Software without restriction, including without limitation the rights to
|
|
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
|
* the Software, and to permit persons to whom the Software is furnished to do so,
|
|
* subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
|
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* http://www.FreeRTOS.org
|
|
* http://aws.amazon.com/freertos
|
|
*
|
|
* 1 tab == 4 spaces!
|
|
*/
|
|
|
|
/*
|
|
BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR USART0.
|
|
|
|
This file contains all the serial port components that can be compiled to
|
|
either ARM or THUMB mode. Components that must be compiled to ARM mode are
|
|
contained in serialISR.c.
|
|
*/
|
|
|
|
/* Standard includes. */
|
|
#include <stdlib.h>
|
|
|
|
/* Scheduler includes. */
|
|
#include "FreeRTOS.h"
|
|
#include "queue.h"
|
|
#include "task.h"
|
|
|
|
/* Demo application includes. */
|
|
#include "serial.h"
|
|
#include "AT91R40008.h"
|
|
#include "usart.h"
|
|
#include "pio.h"
|
|
#include "aic.h"
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/* Constants to setup and access the UART. */
|
|
#define portUSART0_AIC_CHANNEL ( ( unsigned long ) 2 )
|
|
|
|
#define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
|
|
#define serHANDLE ( ( xComPortHandle ) 1 )
|
|
#define serNO_BLOCK ( ( TickType_t ) 0 )
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/* Queues used to hold received characters, and characters waiting to be
|
|
transmitted. */
|
|
static QueueHandle_t xRxedChars;
|
|
static QueueHandle_t xCharsForTx;
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/*
|
|
* The queues are created in serialISR.c as they are used from the ISR.
|
|
* Obtain references to the queues and THRE Empty flag.
|
|
*/
|
|
extern void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, QueueHandle_t *pxRxedChars, QueueHandle_t *pxCharsForTx );
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
|
|
{
|
|
unsigned long ulSpeed;
|
|
unsigned long ulCD;
|
|
xComPortHandle xReturn = serHANDLE;
|
|
extern void ( vUART_ISR_Wrapper )( void );
|
|
|
|
/* The queues are used in the serial ISR routine, so are created from
|
|
serialISR.c (which is always compiled to ARM mode. */
|
|
vSerialISRCreateQueues( uxQueueLength, &xRxedChars, &xCharsForTx );
|
|
|
|
if(
|
|
( xRxedChars != serINVALID_QUEUE ) &&
|
|
( xCharsForTx != serINVALID_QUEUE ) &&
|
|
( ulWantedBaud != ( unsigned long ) 0 )
|
|
)
|
|
{
|
|
portENTER_CRITICAL();
|
|
{
|
|
/* Enable clock to USART0... */
|
|
AT91C_BASE_PS->PS_PCER = AT91C_PS_US0;
|
|
|
|
/* Disable all USART0 interrupt sources to begin... */
|
|
AT91C_BASE_US0->US_IDR = 0xFFFFFFFF;
|
|
|
|
/* Reset various status bits (just in case)... */
|
|
AT91C_BASE_US0->US_CR = US_RSTSTA;
|
|
|
|
AT91C_BASE_PIO->PIO_PDR = TXD0 | RXD0; /* Enable RXD and TXD pins */
|
|
AT91C_BASE_US0->US_CR = US_RSTRX | US_RSTTX | US_RXDIS | US_TXDIS;
|
|
|
|
/* Clear Transmit and Receive Counters */
|
|
AT91C_BASE_US0->US_RCR = 0;
|
|
AT91C_BASE_US0->US_TCR = 0;
|
|
|
|
/* Input clock to baud rate generator is MCK */
|
|
ulSpeed = configCPU_CLOCK_HZ * 10;
|
|
ulSpeed = ulSpeed / 16;
|
|
ulSpeed = ulSpeed / ulWantedBaud;
|
|
|
|
/* compute the error */
|
|
ulCD = ulSpeed / 10;
|
|
if ((ulSpeed - (ulCD * 10)) >= 5)
|
|
ulCD++;
|
|
|
|
/* Define the baud rate divisor register */
|
|
AT91C_BASE_US0->US_BRGR = ulCD;
|
|
|
|
/* Define the USART mode */
|
|
AT91C_BASE_US0->US_MR = US_CLKS_MCK | US_CHRL_8 | US_PAR_NO | US_NBSTOP_1 | US_CHMODE_NORMAL;
|
|
|
|
/* Write the Timeguard Register */
|
|
AT91C_BASE_US0->US_TTGR = 0;
|
|
|
|
/* Setup the interrupt for USART0.
|
|
|
|
Store interrupt handler function address in USART0 vector register... */
|
|
AT91C_BASE_AIC->AIC_SVR[ portUSART0_AIC_CHANNEL ] = (unsigned long)vUART_ISR_Wrapper;
|
|
|
|
/* USART0 interrupt level-sensitive, priority 1... */
|
|
AT91C_BASE_AIC->AIC_SMR[ portUSART0_AIC_CHANNEL ] = AIC_SRCTYPE_INT_LEVEL_SENSITIVE | 1;
|
|
|
|
/* Clear some pending USART0 interrupts (just in case)... */
|
|
AT91C_BASE_US0->US_CR = US_RSTSTA;
|
|
|
|
/* Enable USART0 interrupt sources (but not Tx for now)... */
|
|
AT91C_BASE_US0->US_IER = US_RXRDY;
|
|
|
|
/* Enable USART0 interrupts in the AIC... */
|
|
AT91C_BASE_AIC->AIC_IECR = ( 1 << portUSART0_AIC_CHANNEL );
|
|
|
|
/* Enable receiver and transmitter... */
|
|
AT91C_BASE_US0->US_CR = US_RXEN | US_TXEN;
|
|
}
|
|
portEXIT_CRITICAL();
|
|
}
|
|
else
|
|
{
|
|
xReturn = ( xComPortHandle ) 0;
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
|
|
{
|
|
/* The port handle is not required as this driver only supports UART0. */
|
|
( 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 char * const pcString, unsigned short usStringLength )
|
|
{
|
|
signed char *pxNext;
|
|
|
|
/* 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;
|
|
( void ) usStringLength;
|
|
|
|
/* Send each character in the string, one at a time. */
|
|
pxNext = ( signed char * ) pcString;
|
|
while( *pxNext )
|
|
{
|
|
xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
|
|
pxNext++;
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
|
|
{
|
|
( void ) pxPort;
|
|
|
|
/* Place the character in the queue of characters to be transmitted. */
|
|
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
|
|
{
|
|
return pdFAIL;
|
|
}
|
|
|
|
/* Turn on the Tx interrupt so the ISR will remove the character from the
|
|
queue and send it. This does not need to be in a critical section as
|
|
if the interrupt has already removed the character the next interrupt
|
|
will simply turn off the Tx interrupt again. */
|
|
AT91C_BASE_US0->US_IER = US_TXRDY;
|
|
|
|
return pdPASS;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vSerialClose( xComPortHandle xPort )
|
|
{
|
|
/* Not supported as not required by the demo application. */
|
|
( void ) xPort;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|