Richard Nash / Mbed OS i2c_pca9685_test1

basic pca9685

Fork of ic2_test_bus by Martin Simpson

main.cpp@1:dbe78e80d722, 2018-10-29 (annotated)

Committer:
richnash
Date:
Mon Oct 29 14:56:07 2018 +0000
Revision:
1:dbe78e80d722
Parent:
0:2db41a0c2f17 
basic pca9685

Who changed what in which revision?

UserRevisionLine numberNew contents of line
martinsimpson 0:2db41a0c2f17 1 #include "mbed.h"
richnash 1:dbe78e80d722 2 #include"PCA9685.h"
martinsimpson 0:2db41a0c2f17 3
richnash 1:dbe78e80d722 4 #define I2C_ADDR_PCA9685 (0xEE) // Device You Wish to Use Address - using i2c Address
richnash 1:dbe78e80d722 5
martinsimpson 0:2db41a0c2f17 6 #define WRITE (0x00) // i2c Write bit
martinsimpson 0:2db41a0c2f17 7 #define READ (0x01) // i2c Read bit
martinsimpson 0:2db41a0c2f17 8
richnash 1:dbe78e80d722 9 // ----- NOTES -----
richnash 1:dbe78e80d722 10 // 4.7k resistor pull up to 3.3v on SDA and SDL lines
richnash 1:dbe78e80d722 11 // SCL is green on our boards
richnash 1:dbe78e80d722 12 //
martinsimpson 0:2db41a0c2f17 13
martinsimpson 0:2db41a0c2f17 14 Serial pc(SERIAL_TX, SERIAL_RX); //Serial Class Pin Assignments see Serial.h
martinsimpson 0:2db41a0c2f17 15
richnash 1:dbe78e80d722 16
richnash 1:dbe78e80d722 17 PCA9685 pwm( I2C_SDA, I2C_SCL );
richnash 1:dbe78e80d722 18
richnash 1:dbe78e80d722 19
richnash 1:dbe78e80d722 20 bool I2CScan( I2C *i2c, int Device_Adress )
richnash 1:dbe78e80d722 21 {
richnash 1:dbe78e80d722 22 char ucdata_write[2];
richnash 1:dbe78e80d722 23
richnash 1:dbe78e80d722 24 ucdata_write[0]=0;
richnash 1:dbe78e80d722 25 ucdata_write[1]=0;
richnash 1:dbe78e80d722 26
richnash 1:dbe78e80d722 27 // try writing to the device
richnash 1:dbe78e80d722 28 if (!i2c->write((Device_Adress|WRITE), ucdata_write, 1, 0))// Check for ACK from i2c Device NB I am 'ORing' the Write Bit
richnash 1:dbe78e80d722 29 {
richnash 1:dbe78e80d722 30 // all good
richnash 1:dbe78e80d722 31 return true;
richnash 1:dbe78e80d722 32 }
richnash 1:dbe78e80d722 33 // no device found
richnash 1:dbe78e80d722 34 return false;
richnash 1:dbe78e80d722 35 }
richnash 1:dbe78e80d722 36
martinsimpson 0:2db41a0c2f17 37
richnash 1:dbe78e80d722 38 int I2CScan( I2C *i2c )
richnash 1:dbe78e80d722 39 {
richnash 1:dbe78e80d722 40 short count=0;
richnash 1:dbe78e80d722 41
richnash 1:dbe78e80d722 42 // scan all channels
richnash 1:dbe78e80d722 43 pc.printf("====================================================\n\r");
richnash 1:dbe78e80d722 44 pc.printf("I2CScan (ALL Channels)\n\r");
richnash 1:dbe78e80d722 45 for (int Device_Adress=0; Device_Adress<=0xFE; Device_Adress+=2)//Stepping in 2 Because Read/Write use LSB
richnash 1:dbe78e80d722 46 {
richnash 1:dbe78e80d722 47 if( I2CScan(i2c, Device_Adress) )
richnash 1:dbe78e80d722 48 {
richnash 1:dbe78e80d722 49 pc.printf("I2CScan: %#4x\n\r", Device_Adress );
richnash 1:dbe78e80d722 50 count++;
richnash 1:dbe78e80d722 51 }
richnash 1:dbe78e80d722 52 }
richnash 1:dbe78e80d722 53 pc.printf("%d Devices detected!\n\r",count);
richnash 1:dbe78e80d722 54 pc.printf("====================================================\n\r\n\r");
richnash 1:dbe78e80d722 55
richnash 1:dbe78e80d722 56 return count;
richnash 1:dbe78e80d722 57 }
richnash 1:dbe78e80d722 58
richnash 1:dbe78e80d722 59
richnash 1:dbe78e80d722 60
richnash 1:dbe78e80d722 61 void PCA9685_initDriver() {
richnash 1:dbe78e80d722 62 pwm.begin();
richnash 1:dbe78e80d722 63 pwm.setPWMFreq(1600); // max frequency
richnash 1:dbe78e80d722 64 pwm.frequencyI2C(400000); //400kHz fast I2C comunication
richnash 1:dbe78e80d722 65 }
richnash 1:dbe78e80d722 66
martinsimpson 0:2db41a0c2f17 67
martinsimpson 0:2db41a0c2f17 68 int main()
martinsimpson 0:2db41a0c2f17 69 {
richnash 1:dbe78e80d722 70 I2C i2c(I2C_SDA, I2C_SCL); //I2C Class Pin Assignments see I2C.h
martinsimpson 0:2db41a0c2f17 71
martinsimpson 0:2db41a0c2f17 72 unsigned int uifrequency=400000; //400KHz for i2c Max
richnash 1:dbe78e80d722 73 unsigned int uibaudrate=115200;
martinsimpson 0:2db41a0c2f17 74
richnash 1:dbe78e80d722 75 // debug
richnash 1:dbe78e80d722 76 pc.baud(uibaudrate);
richnash 1:dbe78e80d722 77 pc.printf("\n\r ---- I2C Scanner ---- \n\r");
martinsimpson 0:2db41a0c2f17 78
richnash 1:dbe78e80d722 79 // setup i2c
richnash 1:dbe78e80d722 80 i2c.frequency(uifrequency);
richnash 1:dbe78e80d722 81 pc.printf("I2C: %uKHz\n\r", uifrequency/1000);
richnash 1:dbe78e80d722 82
richnash 1:dbe78e80d722 83 // scan
richnash 1:dbe78e80d722 84 I2CScan(&i2c);
richnash 1:dbe78e80d722 85
richnash 1:dbe78e80d722 86 // Init the PCA9685 on the default addr
richnash 1:dbe78e80d722 87 PCA9685_initDriver();
richnash 1:dbe78e80d722 88
richnash 1:dbe78e80d722 89 // loop led's on channel 0 and 1
richnash 1:dbe78e80d722 90 while(1)
martinsimpson 0:2db41a0c2f17 91 {
richnash 1:dbe78e80d722 92 for (int i = 0; i < 4095; i=i+24)
richnash 1:dbe78e80d722 93 {
richnash 1:dbe78e80d722 94 pwm.setPWM_ALL(4095-i,0);
richnash 1:dbe78e80d722 95 wait(0.0005);
richnash 1:dbe78e80d722 96 }
richnash 1:dbe78e80d722 97 for (int i = 4094; i > 0; i=i-24)
richnash 1:dbe78e80d722 98 {
richnash 1:dbe78e80d722 99 pwm.setPWM_ALL(4095-i,0);
richnash 1:dbe78e80d722 100 wait(0.0005);
richnash 1:dbe78e80d722 101 }
richnash 1:dbe78e80d722 102 /*
richnash 1:dbe78e80d722 103 pc.printf("1.");
richnash 1:dbe78e80d722 104 for (int i = 0; i < 4095; i=i+8)
richnash 1:dbe78e80d722 105 {
richnash 1:dbe78e80d722 106 pwm.setPWM(1,4095-i,0);
richnash 1:dbe78e80d722 107 wait(0.0005);
richnash 1:dbe78e80d722 108
richnash 1:dbe78e80d722 109 pwm.setPWM(2,i,0);
richnash 1:dbe78e80d722 110 wait(0.0005);
richnash 1:dbe78e80d722 111 }
richnash 1:dbe78e80d722 112
richnash 1:dbe78e80d722 113 pc.printf("2.");
richnash 1:dbe78e80d722 114 for (int i = 4094; i > 0; i=i-8)
richnash 1:dbe78e80d722 115 {
richnash 1:dbe78e80d722 116 pwm.setPWM(1,4095-i,0);
richnash 1:dbe78e80d722 117 wait(0.0005);
richnash 1:dbe78e80d722 118
richnash 1:dbe78e80d722 119 pwm.setPWM(2,i,0);
richnash 1:dbe78e80d722 120 wait(0.0005);
richnash 1:dbe78e80d722 121 }
richnash 1:dbe78e80d722 122 pc.printf("\n\r");
richnash 1:dbe78e80d722 123 */
martinsimpson 0:2db41a0c2f17 124 }
martinsimpson 0:2db41a0c2f17 125 }
richnash 1:dbe78e80d722 126