Mick Cher / Mbed 2 deprecated code_oscilloscope_poirier

code c++ carte KL25Z avec écran TFT Qr4 526S01 TP28017 oscilloscope (en développement)

Dependencies:   poirier-proj-95 TFT_fonts mbed

perso/diver.h@5:960d4056d774, 2015-11-28 (annotated)

Committer:
xpoirier
Date:
Sat Nov 28 12:00:07 2015 +0000
Revision:
5:960d4056d774
Parent:
3:24069293d35d 
Projet - oscilloscope - iut neuville sur oise

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dujardin 3:24069293d35d 1
dujardin 3:24069293d35d 2 // pour lecture I2C accelerometre
dujardin 3:24069293d35d 3 PinName const SDA = PTE25;
dujardin 3:24069293d35d 4 PinName const SCL = PTE24;
dujardin 3:24069293d35d 5 I2C i2c(SDA,SCL);
dujardin 3:24069293d35d 6
dujardin 3:24069293d35d 7 #define REG_WHO_AM_I 0x0D
dujardin 3:24069293d35d 8 #define REG_CTRL_REG_1 0x2A
dujardin 3:24069293d35d 9 #define REG_OUT_X_MSB 0x01
dujardin 3:24069293d35d 10 #define REG_OUT_Y_MSB 0x03
dujardin 3:24069293d35d 11 #define REG_OUT_Z_MSB 0x05
dujardin 3:24069293d35d 12
dujardin 3:24069293d35d 13 #define MMA8451_I2C_ADDRESS (0x1d<<1)
dujardin 3:24069293d35d 14
dujardin 3:24069293d35d 15 // #define UINT14_MAX 16383
dujardin 3:24069293d35d 16 #define UINT14_MAX 16384
dujardin 2:1d66e2e776bc 17
dujardin 2:1d66e2e776bc 18
dujardin 3:24069293d35d 19 static const float redx=0.0f;
dujardin 3:24069293d35d 20 static const float redy=1.0f;
dujardin 3:24069293d35d 21 static const float greenx=sqrt(3.0f)/2.0f;
dujardin 3:24069293d35d 22 static const float greeny=-0.5f;
dujardin 3:24069293d35d 23 static const float bluex=-sqrt(3.0f)/2.0f;
dujardin 3:24069293d35d 24 static const float bluey=-0.5f;
dujardin 3:24069293d35d 25
dujardin 3:24069293d35d 26 static const float twothirds=2.0f/3.0f;
dujardin 3:24069293d35d 27
dujardin 3:24069293d35d 28
dujardin 3:24069293d35d 29 float acclnread(uint8_t reg)
dujardin 3:24069293d35d 30 {
dujardin 3:24069293d35d 31 // Normalisation here seems wrong
dujardin 3:24069293d35d 32 char t[1]= {reg};
dujardin 3:24069293d35d 33 i2c.write(MMA8451_I2C_ADDRESS,t,1,true);
dujardin 3:24069293d35d 34 uint8_t xbits[2] = {0,0};
dujardin 3:24069293d35d 35 i2c.read(MMA8451_I2C_ADDRESS,(char *)xbits,2);
dujardin 3:24069293d35d 36 int16_t xint = 0;
dujardin 3:24069293d35d 37 xint=(xbits[0]<<6)|(xbits[1]>>2);
dujardin 3:24069293d35d 38 // this sign flip code looks wrong, UINT14_MAX maps to 0
dujardin 3:24069293d35d 39 // UINT14_MAX=16383, should it be UINT14_MAX=16384
dujardin 3:24069293d35d 40 if (xint > UINT14_MAX>>1)
dujardin 3:24069293d35d 41 xint -= UINT14_MAX;
dujardin 3:24069293d35d 42 return float(xint)/4096.0f;
dujardin 3:24069293d35d 43 // return float(xint);
dujardin 3:24069293d35d 44 }