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Created October 11, 2012 14:58
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Stellaris Launchpad serialADC
Raw
Makefile
#******************************************************************************
#
# Makefile - Rules for building the serialADC example.
#
# Copyright (c) 2012 Texas Instruments Incorporated. All rights reserved.
# Software License Agreement
#
# Texas Instruments (TI) is supplying this software for use solely and
# exclusively on TI's microcontroller products. The software is owned by
# TI and/or its suppliers, and is protected under applicable copyright
# laws. You may not combine this software with "viral" open-source
# software in order to form a larger program.
#
# THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
# NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
# NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
# CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
# DAMAGES, FOR ANY REASON WHATSOEVER.
#
# This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
#
#******************************************************************************
#
# Defines the part type that this project uses.
#
PART=LM4F120H5QR
#
# Set the processor variant.
#
VARIANT=cm4f
#
# The base directory for StellarisWare.
#
ROOT=../../..
#
# Include the common make definitions.
#
include ${ROOT}/makedefs
#
# Where to find header files that do not live in the source directory.
#
IPATH=../../..
#
# Where to find source files that do not live in this directory.
#
VPATH=../../../utils
#
# The default rule, which causes the serialADC example to be built.
#
all: ${COMPILER}
all: ${COMPILER}/serialADC.axf
#
# The rule to clean out all the build products.
#
clean:
@rm -rf ${COMPILER} ${wildcard *~}
#
# The rule to create the target directory.
#
${COMPILER}:
@mkdir -p ${COMPILER}
#
# Rules for building the serialADC example.
#
${COMPILER}/serialADC.axf: ${COMPILER}/startup_${COMPILER}.o
${COMPILER}/serialADC.axf: ${COMPILER}/serialADC.o
${COMPILER}/serialADC.axf: ${COMPILER}/uartstdio.o
${COMPILER}/serialADC.axf: ${ROOT}/driverlib/${COMPILER}-cm4f/libdriver-cm4f.a
${COMPILER}/serialADC.axf: serialADC.ld
SCATTERgcc_serialADC=serialADC.ld
ENTRY_serialADC=ResetISR
CFLAGSgcc=-DTARGET_IS_BLIZZARD_RA1
#
# Include the automatically generated dependency files.
#
ifneq (${MAKECMDGOALS},clean)
-include ${wildcard ${COMPILER}/*.d} __dummy__
endif
Raw
serialADC.c
/*
* serialADC: send the data from the internal temperature sensor
* via uart0 back to a connected PC.
*
* Author: Mauro Scomparin <scompo@gmail.com>
* Version: 1.0
* Date: 11/10/2012
*/
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/adc.h"
#include "driverlib/gpio.h"
#include "driverlib/sysctl.h"
#include "driverlib/debug.h"
#include "utils/uartstdio.h"
#ifdef DEBUG
void__error__(char *pcFilename, unsigned long ulLine){
}
#endif
#define ADC_SEQUENCER_LENGTH 1
//initializes the adc
void initADC(void){
//enable the adc0 peripherial.
SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
//set the speed to 1msps.
SysCtlADCSpeedSet(SYSCTL_ADCSPEED_1MSPS);
//set the auto avergage to 64.
ADCHardwareOversampleConfigure(ADC0_BASE, 64);
//before setting up I must disable the sequence 3.
ADCSequenceDisable(ADC0_BASE, 3);
//set the sequence to use (adc0 sequence 3).
ADCSequenceConfigure(ADC0_BASE, 3, ADC_TRIGGER_PROCESSOR, 0);
//set up the sequence step.
//set up the last step and start an interrupt when the conversion it's over.
ADCSequenceStepConfigure(ADC0_BASE, 3, 0, ADC_CTL_TS | ADC_CTL_IE | ADC_CTL_END);
//enable the sequence again!
ADCSequenceEnable(ADC0_BASE, 3);
}
void initConsole(void)
{
//enable portA
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
//configure the pin multiplexing
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
//configure the type of the pins for uart tx/rx
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
//init the console
UARTStdioInit(0);
}
//Main entry point for application.
int main(void){
//Variable to store the data from the sequencer.
unsigned long ulADC0Value[ADC_SEQUENCER_LENGTH];
unsigned long ulTemp_ValueC=0;
//Set the system clock to run at 40MHz.
SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_OSC_MAIN|SYSCTL_XTAL_16MHZ);
//I should initialize the adc!
initADC();
//init the console for serial use.
initConsole();
while(1)
{
//clear the interrupt flag
ADCIntClear(ADC0_BASE, 3);
//trigger the adc conversion process.
ADCProcessorTrigger(ADC0_BASE, 3);
//wait for the interrupt flag to get set!
while(!ADCIntStatus(ADC0_BASE, 3, false))
{
}
//get the actual data samples from adc0 sequencer 3!
ADCSequenceDataGet(ADC0_BASE, 3, ulADC0Value);
//convert the value!
ulTemp_ValueC = ((1475 * 1023) - (2250 * ulADC0Value[0])) / 10230;;
UARTprintf("Temperature = %3d*C \n\r", ulTemp_ValueC);
SysCtlDelay(SysCtlClockGet() / 12);
}
}
Raw
startup_gcc.c
//*****************************************************************************
//
// startup_gcc.c - Startup code for use with GNU tools.
//
// Copyright (c) 2012 Texas Instruments Incorporated. All rights reserved.
// Software License Agreement
//
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
//
// This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
//
//*****************************************************************************
#include "inc/hw_nvic.h"
#include "inc/hw_types.h"
//*****************************************************************************
//
// Forward declaration of the default fault handlers.
//
//*****************************************************************************
void ResetISR(void);
static void NmiSR(void);
static void FaultISR(void);
static void IntDefaultHandler(void);
//*****************************************************************************
//
// External declaration for the interrupt handler used by the application.
// extern void UARTIntHandler(void);
//*****************************************************************************
//*****************************************************************************
//
// The entry point for the application.
//
//*****************************************************************************
extern int main(void);
//*****************************************************************************
//
// Reserve space for the system stack.
//
//*****************************************************************************
static unsigned long pulStack[64];
//*****************************************************************************
//
// The vector table. Note that the proper constructs must be placed on this to
// ensure that it ends up at physical address 0x0000.0000.
//
//*****************************************************************************
__attribute__ ((section(".isr_vector")))
void (* const g_pfnVectors[])(void) =
{
(void (*)(void))((unsigned long)pulStack + sizeof(pulStack)),
// The initial stack pointer
ResetISR, // The reset handler
NmiSR, // The NMI handler
FaultISR, // The hard fault handler
IntDefaultHandler, // The MPU fault handler
IntDefaultHandler, // The bus fault handler
IntDefaultHandler, // The usage fault handler
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
IntDefaultHandler, // SVCall handler
IntDefaultHandler, // Debug monitor handler
0, // Reserved
IntDefaultHandler, // The PendSV handler
IntDefaultHandler, // The SysTick handler
IntDefaultHandler, // GPIO Port A
IntDefaultHandler, // GPIO Port B
IntDefaultHandler, // GPIO Port C
IntDefaultHandler, // GPIO Port D
IntDefaultHandler, // GPIO Port E
IntDefaultHandler, // UART0 Rx and Tx
IntDefaultHandler, // UART1 Rx and Tx
IntDefaultHandler, // SSI0 Rx and Tx
IntDefaultHandler, // I2C0 Master and Slave
IntDefaultHandler, // PWM Fault
IntDefaultHandler, // PWM Generator 0
IntDefaultHandler, // PWM Generator 1
IntDefaultHandler, // PWM Generator 2
IntDefaultHandler, // Quadrature Encoder 0
IntDefaultHandler, // ADC Sequence 0
IntDefaultHandler, // ADC Sequence 1
IntDefaultHandler, // ADC Sequence 2
IntDefaultHandler, // ADC Sequence 3
IntDefaultHandler, // Watchdog timer
IntDefaultHandler, // Timer 0 subtimer A
IntDefaultHandler, // Timer 0 subtimer B
IntDefaultHandler, // Timer 1 subtimer A
IntDefaultHandler, // Timer 1 subtimer B
IntDefaultHandler, // Timer 2 subtimer A
IntDefaultHandler, // Timer 2 subtimer B
IntDefaultHandler, // Analog Comparator 0
IntDefaultHandler, // Analog Comparator 1
IntDefaultHandler, // Analog Comparator 2
IntDefaultHandler, // System Control (PLL, OSC, BO)
IntDefaultHandler, // FLASH Control
IntDefaultHandler, // GPIO Port F
IntDefaultHandler, // GPIO Port G
IntDefaultHandler, // GPIO Port H
IntDefaultHandler, // UART2 Rx and Tx
IntDefaultHandler, // SSI1 Rx and Tx
IntDefaultHandler, // Timer 3 subtimer A
IntDefaultHandler, // Timer 3 subtimer B
IntDefaultHandler, // I2C1 Master and Slave
IntDefaultHandler, // Quadrature Encoder 1
IntDefaultHandler, // CAN0
IntDefaultHandler, // CAN1
IntDefaultHandler, // CAN2
IntDefaultHandler, // Ethernet
IntDefaultHandler, // Hibernate
IntDefaultHandler, // USB0
IntDefaultHandler, // PWM Generator 3
IntDefaultHandler, // uDMA Software Transfer
IntDefaultHandler, // uDMA Error
IntDefaultHandler, // ADC1 Sequence 0
IntDefaultHandler, // ADC1 Sequence 1
IntDefaultHandler, // ADC1 Sequence 2
IntDefaultHandler, // ADC1 Sequence 3
IntDefaultHandler, // I2S0
IntDefaultHandler, // External Bus Interface 0
IntDefaultHandler, // GPIO Port J
IntDefaultHandler, // GPIO Port K
IntDefaultHandler, // GPIO Port L
IntDefaultHandler, // SSI2 Rx and Tx
IntDefaultHandler, // SSI3 Rx and Tx
IntDefaultHandler, // UART3 Rx and Tx
IntDefaultHandler, // UART4 Rx and Tx
IntDefaultHandler, // UART5 Rx and Tx
IntDefaultHandler, // UART6 Rx and Tx
IntDefaultHandler, // UART7 Rx and Tx
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
IntDefaultHandler, // I2C2 Master and Slave
IntDefaultHandler, // I2C3 Master and Slave
IntDefaultHandler, // Timer 4 subtimer A
IntDefaultHandler, // Timer 4 subtimer B
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
IntDefaultHandler, // Timer 5 subtimer A
IntDefaultHandler, // Timer 5 subtimer B
IntDefaultHandler, // Wide Timer 0 subtimer A
IntDefaultHandler, // Wide Timer 0 subtimer B
IntDefaultHandler, // Wide Timer 1 subtimer A
IntDefaultHandler, // Wide Timer 1 subtimer B
IntDefaultHandler, // Wide Timer 2 subtimer A
IntDefaultHandler, // Wide Timer 2 subtimer B
IntDefaultHandler, // Wide Timer 3 subtimer A
IntDefaultHandler, // Wide Timer 3 subtimer B
IntDefaultHandler, // Wide Timer 4 subtimer A
IntDefaultHandler, // Wide Timer 4 subtimer B
IntDefaultHandler, // Wide Timer 5 subtimer A
IntDefaultHandler, // Wide Timer 5 subtimer B
IntDefaultHandler, // FPU
IntDefaultHandler, // PECI 0
IntDefaultHandler, // LPC 0
IntDefaultHandler, // I2C4 Master and Slave
IntDefaultHandler, // I2C5 Master and Slave
IntDefaultHandler, // GPIO Port M
IntDefaultHandler, // GPIO Port N
IntDefaultHandler, // Quadrature Encoder 2
IntDefaultHandler, // Fan 0
0, // Reserved
IntDefaultHandler, // GPIO Port P (Summary or P0)
IntDefaultHandler, // GPIO Port P1
IntDefaultHandler, // GPIO Port P2
IntDefaultHandler, // GPIO Port P3
IntDefaultHandler, // GPIO Port P4
IntDefaultHandler, // GPIO Port P5
IntDefaultHandler, // GPIO Port P6
IntDefaultHandler, // GPIO Port P7
IntDefaultHandler, // GPIO Port Q (Summary or Q0)
IntDefaultHandler, // GPIO Port Q1
IntDefaultHandler, // GPIO Port Q2
IntDefaultHandler, // GPIO Port Q3
IntDefaultHandler, // GPIO Port Q4
IntDefaultHandler, // GPIO Port Q5
IntDefaultHandler, // GPIO Port Q6
IntDefaultHandler, // GPIO Port Q7
IntDefaultHandler, // GPIO Port R
IntDefaultHandler, // GPIO Port S
IntDefaultHandler, // PWM 1 Generator 0
IntDefaultHandler, // PWM 1 Generator 1
IntDefaultHandler, // PWM 1 Generator 2
IntDefaultHandler, // PWM 1 Generator 3
IntDefaultHandler // PWM 1 Fault
};
//*****************************************************************************
//
// The following are constructs created by the linker, indicating where the
// the "data" and "bss" segments reside in memory. The initializers for the
// for the "data" segment resides immediately following the "text" segment.
//
//*****************************************************************************
extern unsigned long _etext;
extern unsigned long _data;
extern unsigned long _edata;
extern unsigned long _bss;
extern unsigned long _ebss;
//*****************************************************************************
//
// This is the code that gets called when the processor first starts execution
// following a reset event. Only the absolutely necessary set is performed,
// after which the application supplied entry() routine is called. Any fancy
// actions (such as making decisions based on the reset cause register, and
// resetting the bits in that register) are left solely in the hands of the
// application.
//
//*****************************************************************************
void
ResetISR(void)
{
unsigned long *pulSrc, *pulDest;
//
// Copy the data segment initializers from flash to SRAM.
//
pulSrc = &_etext;
for(pulDest = &_data; pulDest < &_edata; )
{
*pulDest++ = *pulSrc++;
}
//
// Zero fill the bss segment.
//
__asm(" ldr r0, =_bss\n"
" ldr r1, =_ebss\n"
" mov r2, #0\n"
" .thumb_func\n"
"zero_loop:\n"
" cmp r0, r1\n"
" it lt\n"
" strlt r2, [r0], #4\n"
" blt zero_loop");
//
// Enable the floating-point unit. This must be done here to handle the
// case where main() uses floating-point and the function prologue saves
// floating-point registers (which will fault if floating-point is not
// enabled). Any configuration of the floating-point unit using DriverLib
// APIs must be done here prior to the floating-point unit being enabled.
//
// Note that this does not use DriverLib since it might not be included in
// this project.
//
HWREG(NVIC_CPAC) = ((HWREG(NVIC_CPAC) &
~(NVIC_CPAC_CP10_M | NVIC_CPAC_CP11_M)) |
NVIC_CPAC_CP10_FULL | NVIC_CPAC_CP11_FULL);
//
// Call the application's entry point.
//
main();
}
//*****************************************************************************
//
// This is the code that gets called when the processor receives a NMI. This
// simply enters an infinite loop, preserving the system state for examination
// by a debugger.
//
//*****************************************************************************
static void
NmiSR(void)
{
//
// Enter an infinite loop.
//
while(1)
{
}
}
//*****************************************************************************
//
// This is the code that gets called when the processor receives a fault
// interrupt. This simply enters an infinite loop, preserving the system state
// for examination by a debugger.
//
//*****************************************************************************
static void
FaultISR(void)
{
//
// Enter an infinite loop.
//
while(1)
{
}
}
//*****************************************************************************
//
// This is the code that gets called when the processor receives an unexpected
// interrupt. This simply enters an infinite loop, preserving the system state
// for examination by a debugger.
//
//*****************************************************************************
static void
IntDefaultHandler(void)
{
//
// Go into an infinite loop.
//
while(1)
{
}
}
Raw
uart_echo.ld
/******************************************************************************
*
* uart_echo.ld - Linker configuration file for uart_echo.
*
* Copyright (c) 2012 Texas Instruments Incorporated. All rights reserved.
* Software License Agreement
*
* Texas Instruments (TI) is supplying this software for use solely and
* exclusively on TI's microcontroller products. The software is owned by
* TI and/or its suppliers, and is protected under applicable copyright
* laws. You may not combine this software with "viral" open-source
* software in order to form a larger program.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
* NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
* NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
* CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
* DAMAGES, FOR ANY REASON WHATSOEVER.
*
* This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
*
*****************************************************************************/
MEMORY
{
FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x00040000
SRAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00008000
}
SECTIONS
{
.text :
{
_text = .;
KEEP(*(.isr_vector))
*(.text*)
*(.rodata*)
_etext = .;
} > FLASH
.data : AT(ADDR(.text) + SIZEOF(.text))
{
_data = .;
*(vtable)
*(.data*)
_edata = .;
} > SRAM
.bss :
{
_bss = .;
*(.bss*)
*(COMMON)
_ebss = .;
} > SRAM
}
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