Projet S5 Info
Projet S5 Lecture de l'accelerometre avec interruption
Dependencies: mbed PowerControl
Fork of
Projet_S5
by 
Jonathan Tousignant
Revision 0:d80295a0bcc2, committed 2014-03-26
- Comitter:
- joGenie
- Date:
- Wed Mar 26 16:13:42 2014 +0000
- Child:
- 1:feae56685ab1
- Commit message:
- In C++;
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/accelerometer.cpp Wed Mar 26 16:13:42 2014 +0000
@@ -0,0 +1,98 @@
+#include "accelerometer.h"
+
+Accelerometer::Accelerometer() :
+ i2c(p9, p10)
+{
+ initAccel();
+}
+
+Accelerometer::~Accelerometer(){}
+
+void Accelerometer::writeToRegister(int address, int startingRegister, int data2Write)
+{
+ char data[2];
+ data[0] = startingRegister;
+ data[1] = data2Write;
+
+ i2c.write(address, data, 2);
+}
+
+int Accelerometer::readRegister(int address, int startingRegister)
+{
+ char content[1];
+ char reg[1];
+ reg[0] = startingRegister;
+
+ i2c.write(address, reg, 1, true);
+ i2c.read(address, content, 1);
+
+ return content[0];
+}
+
+char Accelerometer::i2c_read_reg(char address) //fonction qui lit les valeurs des registres
+{
+ // Read from selected register adress
+ i2c.start();
+ i2c.write(MMA8452_WRITE_ADDRESS);
+ i2c.write(address);
+ i2c.start();
+ i2c.write(MMA8452_READ_ADDRESS);
+ char data = i2c.read(0);
+ i2c.stop();
+
+ // return the data readed
+ return data;
+}
+
+bool Accelerometer::initAccel() //fonction qui initialise l'Accelerometer avec i2c
+{
+ // Start I2C communication
+ char data = i2c_read_reg(WHO_AM_I);
+ if(data != 0x2A)
+ {
+ return false;
+ }
+
+ // Put accelerometer in active mode at 6.25Hz
+ writeToRegister(MMA8452_WRITE_ADDRESS, CTRL_REG1, 0x31);
+
+ // Put accelerometer in standby mode at 6.25Hz
+ writeToRegister(MMA8452_WRITE_ADDRESS, CTRL_REG1, 0x30);
+
+ // Set accelerometer in 4g range
+ writeToRegister(MMA8452_WRITE_ADDRESS, XYZ_DATA_CFG, 0x1);
+
+ // Put accelerometer in active mode at 6.25Hz
+ writeToRegister(MMA8452_WRITE_ADDRESS, CTRL_REG1, 0x31);
+
+ return true;
+}
+
+unsigned short* Accelerometer::getAccelValue()
+{
+ unsigned short* values = new unsigned short[3];
+
+ values[0] = i2c_read_reg(OUT_X_MSB);
+ values[1] = i2c_read_reg(OUT_Y_MSB);
+ values[2] = i2c_read_reg(OUT_Z_MSB);
+
+ return values;
+}
+
+extern void *Accelerometer_C_new()
+{
+ return new Accelerometer();
+}
+
+extern void Accelerometer_C_delete(void *accelerometer)
+{
+ Accelerometer *acc = (Accelerometer*)accelerometer;
+ delete acc;
+}
+
+extern unsigned short* Accelerometer_C_getAccelValue(void *accelerometer)
+{
+ Accelerometer *acc = (Accelerometer*)accelerometer;
+ return acc->getAccelValue();
+}
+
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/accelerometer.h Wed Mar 26 16:13:42 2014 +0000
@@ -0,0 +1,55 @@
+#ifndef ACCELERATOR_H
+#define ACCELERATOR_H
+
+#include "mbed.h"
+
+/********************************************************
+* DEFINES
+********************************************************/
+
+#define DELAY 0.5
+
+#define MMA8452_WRITE_ADDRESS 0x3A
+#define MMA8452_READ_ADDRESS 0x3B
+#define WHO_AM_I 0x0D
+#define OUT_X_MSB 0x01
+#define OUT_X_LSB 0x02
+#define OUT_Y_MSB 0x03
+#define OUT_Y_LSB 0x04
+#define OUT_Z_MSB 0x05
+#define OUT_Z_LSB 0x06
+#define CTRL_REG1 0x2A
+#define CTRL_REG2 0x2B
+#define XYZ_DATA_CFG 0x0E
+
+class Accelerometer
+{
+public:
+ Accelerometer();
+ ~Accelerometer();
+
+ unsigned short* getAccelValue();
+
+private:
+ void writeToRegister(int address, int startingRegister, int data2Write);
+ int readRegister(int address, int startingRegister);
+ char i2c_read_reg(char address);
+ bool initAccel();
+
+ I2C i2c; // I2C port (sda, scl)
+};
+
+// Define function in C for interruption
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void *Accelerometer_C_new();
+extern void Accelerometer_C_delete(void *accelerometer);
+extern unsigned short* Accelerometer_C_getAccelValue(void *accelerometer);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/interrupt.h Wed Mar 26 16:13:42 2014 +0000
@@ -0,0 +1,11 @@
+#ifndef INTERRUPT_H
+#define INTERRUPT_H
+
+extern "C"
+{
+void interruptMatch();
+void interruptCapture();
+
+void initialize();
+}
+#endif //INTERRUPT_H
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Mar 26 16:13:42 2014 +0000
@@ -0,0 +1,87 @@
+#include "accelerometer.h"
+#include "interrupt.h"
+
+Serial pc(USBTX, USBRX);
+void *accelerometer = Accelerometer_C_new();
+bool capture = false;
+
+extern "C" void interruptCapture()
+{
+ capture = !capture;
+
+ if (capture)
+ {
+ LPC_TIM3->TC = 0; // clear timer counter
+ LPC_TIM3->PC = 0; // clear prescale counter
+ LPC_TIM3->PR = 0; // clear prescale register
+ LPC_TIM3->IR |= 0xFF;
+
+ NVIC_EnableIRQ(TIMER3_IRQn); // Enable timer3 interrupt
+
+ }
+ else
+ {
+ NVIC_DisableIRQ(TIMER3_IRQn); // Disable timer3 interrupt
+ }
+}
+
+extern "C" void interruptMatch()
+{
+ unsigned short* values;
+
+ values = Accelerometer_C_getAccelValue(accelerometer);
+
+ for(int i = 0; i < 3; i++)
+ pc.printf("%d/n/r", values[i]);
+
+
+ LPC_TIM3->IR |= 0x01; // Reset timer
+}
+
+void initialize()
+{
+ // Set system control
+ LPC_SC->PCONP |= (3 << 22); // Enable Timer2
+ LPC_SC->PCLKSEL1 |= (1 << 12); // PClk Timer2 = CCLK
+
+ // Set pin connection
+ LPC_PINCON->PINSEL0 |= (3 << 8) | (3<<20); // Pin 30 Capture and Pin X Match
+
+ // Set timer 2 for capture
+ LPC_TIM2->TC = 0; // clear timer counter
+ LPC_TIM2->PC = 0; // clear prescale counter
+ LPC_TIM2->PR = 0; // clear prescale register
+ LPC_TIM2->TCR = (1 << 1); // reset timer
+ LPC_TIM2->IR |= 0xFF; // Clear MR0 interrupt flag
+ LPC_TIM2->CCR |= (7 << 0); // enable cap2.0 rising-edge capture and falling-edge; interrupt on cap2.0
+ LPC_TIM2->TCR = 1; // start Timer2
+
+ NVIC_EnableIRQ(TIMER2_IRQn); //enable timer2 interrupt
+
+ // Set timer 3 for match
+ LPC_TIM3->MR0 = SystemCoreClock / 20;
+ LPC_TIM3->MCR |= 0x03; //interrupt and reset control
+ LPC_TIM3->TC = 0; // clear timer counter
+ LPC_TIM3->PC = 0; // clear prescale counter
+ LPC_TIM3->PR = 0; // clear prescale register
+ LPC_TIM3->TCR = 0x1; // enable timer3
+ LPC_TIM3->IR |= 1 << 0; // Clear MR0 interrupt flag
+
+ // Set call function
+ NVIC_SetVector(TIMER2_IRQn, uint32_t(interruptCapture));
+ NVIC_SetVector(TIMER3_IRQn, uint32_t(interruptMatch));
+}
+
+int main()
+{
+ Accelerometer accel;
+ while(1)
+ {
+ unsigned short* values;
+ wait(0.1);
+ values = accel.getAccelValue();
+
+ for(int i = 0; i < 3; i++)
+ pc.printf("%d/n/r", values[i]);
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Mar 26 16:13:42 2014 +0000 @@ -0,0 +1,1 @@ +http://world3.dev.mbed.org/users/mbed_official/code/mbed/builds/824293ae5e43 \ No newline at end of file