La Suno / Mbed 2 deprecated afero_poc15_180403

I2C hang recover function added

Dependencies:   UniGraphic mbed vt100

In this version, check_i2c_pins function was added in edge_mgr.cpp.

プログラムの起動時、I2Cモジュールを初期化する前に、I2Cに使用するピンの電位を確認し
もし一方でも Low に張り付いていた場合、SCL を GPIO 出力に設定して　
所定回数 (I2C_UNLOCK_TRIAL_CYCLE) 反転させることにより、疑似リセットクロックを生成します。

その後は、通常の起動手順に復帰し、以降はこれまでと同様の動作をします。

sensors/PSE530.cpp@0:d895cd1cd897, 2018-04-03 (annotated)

Committer:
Rhyme
Date:
Tue Apr 03 08:30:29 2018 +0000
Revision:
0:d895cd1cd897
Child:
2:de22987be9ba
Initial I2C Pin force reset function added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rhyme 0:d895cd1cd897 1 #include "mbed.h"
Rhyme 0:d895cd1cd897 2 #include "PSE530.h"
Rhyme 0:d895cd1cd897 3
Rhyme 0:d895cd1cd897 4 /**
Rhyme 0:d895cd1cd897 5 * SMC PSE530 pressure sensor
Rhyme 0:d895cd1cd897 6 * analog output 1.0V - 5.0V
Rhyme 0:d895cd1cd897 7 * 1.0V : 0
Rhyme 0:d895cd1cd897 8 * 5.0V : 1MPa
Rhyme 0:d895cd1cd897 9 * (at 0.6V : -0.1MPa)
Rhyme 0:d895cd1cd897 10 * Our sensor I/F converts 0-5V to 0-3V
Rhyme 0:d895cd1cd897 11 * So we suppose V = Analog Float Value : Pressure
Rhyme 0:d895cd1cd897 12 * 0.6V = 0.2 : 0
Rhyme 0:d895cd1cd897 13 * 3.0V = 1.0 : 1MPa
Rhyme 0:d895cd1cd897 14 */
Rhyme 0:d895cd1cd897 15
Rhyme 0:d895cd1cd897 16 /**
Rhyme 0:d895cd1cd897 17 * conversion from Pa to kgf/cm2
Rhyme 0:d895cd1cd897 18 * 98,066.5 Pa = 1 kgf/cm2
Rhyme 0:d895cd1cd897 19 * 1 Pa = 1 / 98066.6 kgf/cm2
Rhyme 0:d895cd1cd897 20 */
Rhyme 0:d895cd1cd897 21
Rhyme 0:d895cd1cd897 22 PSE530::PSE530(AnalogIn *ain)
Rhyme 0:d895cd1cd897 23 {
Rhyme 0:d895cd1cd897 24 _ain = ain ;
Rhyme 0:d895cd1cd897 25 }
Rhyme 0:d895cd1cd897 26
Rhyme 0:d895cd1cd897 27 PSE530::~PSE530(void)
Rhyme 0:d895cd1cd897 28 {
Rhyme 0:d895cd1cd897 29 if (_ain) {
Rhyme 0:d895cd1cd897 30 delete _ain ;
Rhyme 0:d895cd1cd897 31 }
Rhyme 0:d895cd1cd897 32 }
Rhyme 0:d895cd1cd897 33
Rhyme 0:d895cd1cd897 34 /**
Rhyme 0:d895cd1cd897 35 * On FRDM-KL25Z ADC's AREF is about 3.28V
Rhyme 0:d895cd1cd897 36 * Where the converted pressure output is 0 to 3.21V
Rhyme 0:d895cd1cd897 37 * So we must map ADC output 0 to 3.21/3.28 as full scale
Rhyme 0:d895cd1cd897 38 *
Rhyme 0:d895cd1cd897 39 * Then according to the datasheet of PSE530
Rhyme 0:d895cd1cd897 40 * when full range is 0V to 5V
Rhyme 0:d895cd1cd897 41 * 1V is 0 and 5V is 1MPa which is converted to
Rhyme 0:d895cd1cd897 42 * 0.642/3.28 to 3.21/3.28 ~ 0.195731 to 0.9786585.
Rhyme 0:d895cd1cd897 43 * The linear equation of
Rhyme 0:d895cd1cd897 44 * y = a x + b
Rhyme 0:d895cd1cd897 45 * 0 = a * 0.195731 + b
Rhyme 0:d895cd1cd897 46 * 1 = a * 0.978658 + b
Rhyme 0:d895cd1cd897 47 * results a = 1.277, b = -0.250
Rhyme 0:d895cd1cd897 48 */
Rhyme 0:d895cd1cd897 49 float PSE530::getPressure(void)
Rhyme 0:d895cd1cd897 50 {
Rhyme 0:d895cd1cd897 51 float coef_A = 1.277 ;
Rhyme 0:d895cd1cd897 52 float coef_B = -0.250 ;
Rhyme 0:d895cd1cd897 53 float av = 0.0 ;
Rhyme 0:d895cd1cd897 54 float value = 0.0 ;
Rhyme 0:d895cd1cd897 55 av = coef_A * _ain->read() + coef_B ;
Rhyme 0:d895cd1cd897 56 // printf("Pressure ADC = %.4f\n", av) ;
Rhyme 0:d895cd1cd897 57 value = 1000000 * av ; /* 1MPa at 1.0 */
Rhyme 0:d895cd1cd897 58 value = value / 98066.5 ; /* Pa -> kgf/cm2 */
Rhyme 0:d895cd1cd897 59 return( value ) ;
Rhyme 0:d895cd1cd897 60 }