Joao Vale / NUCLEO_ATTINY

I2C Tester

Dependencies:   mbed-src

main.cpp@0:bc53a5d93a32, 2015-08-06 (annotated)

Committer:
jdiogo10
Date:
Thu Aug 06 17:05:41 2015 +0000
Revision:
0:bc53a5d93a32
ESRG - JV

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jdiogo10 0:bc53a5d93a32 1 #include "mbed.h"
jdiogo10 0:bc53a5d93a32 2
jdiogo10 0:bc53a5d93a32 3 #define SHT21_REG_DATA (0x00) // Data Register
jdiogo10 0:bc53a5d93a32 4 #define SHT21_REG_CONF (0x01) // Configuration Register
jdiogo10 0:bc53a5d93a32 5 #define SHT21_ADDR (0xAA) // SHT21 address
jdiogo10 0:bc53a5d93a32 6
jdiogo10 0:bc53a5d93a32 7 I2C i2c1(D14, D15); // This is I2C1 SDA, SCL
jdiogo10 0:bc53a5d93a32 8 //PwmOut attiny(D3); // This is PWM2/2
jdiogo10 0:bc53a5d93a32 9 DigitalOut attiny(D3); // This is PWM2/2
jdiogo10 0:bc53a5d93a32 10 Serial usart1(D10, D2); // This is USART1 TX, RX
jdiogo10 0:bc53a5d93a32 11 InterruptIn button(USER_BUTTON); // This is USERBUTTON (PC_13)
jdiogo10 0:bc53a5d93a32 12
jdiogo10 0:bc53a5d93a32 13 Ticker flipper;
jdiogo10 0:bc53a5d93a32 14 DigitalOut led(LED1);
jdiogo10 0:bc53a5d93a32 15
jdiogo10 0:bc53a5d93a32 16 volatile bool button_pressed = false;
jdiogo10 0:bc53a5d93a32 17
jdiogo10 0:bc53a5d93a32 18 //void usart1_RxIrq()
jdiogo10 0:bc53a5d93a32 19 //{
jdiogo10 0:bc53a5d93a32 20 // if(usart1.readable())
jdiogo10 0:bc53a5d93a32 21 // {
jdiogo10 0:bc53a5d93a32 22 // }
jdiogo10 0:bc53a5d93a32 23 //}
jdiogo10 0:bc53a5d93a32 24
jdiogo10 0:bc53a5d93a32 25 void pwmon()
jdiogo10 0:bc53a5d93a32 26 {
jdiogo10 0:bc53a5d93a32 27 button_pressed = true;
jdiogo10 0:bc53a5d93a32 28 }
jdiogo10 0:bc53a5d93a32 29
jdiogo10 0:bc53a5d93a32 30 void pwmoff()
jdiogo10 0:bc53a5d93a32 31 {
jdiogo10 0:bc53a5d93a32 32 button_pressed = false;
jdiogo10 0:bc53a5d93a32 33 }
jdiogo10 0:bc53a5d93a32 34
jdiogo10 0:bc53a5d93a32 35 void flip()
jdiogo10 0:bc53a5d93a32 36 {
jdiogo10 0:bc53a5d93a32 37 led = !led;
jdiogo10 0:bc53a5d93a32 38 attiny = !attiny;
jdiogo10 0:bc53a5d93a32 39 }
jdiogo10 0:bc53a5d93a32 40
jdiogo10 0:bc53a5d93a32 41 int main()
jdiogo10 0:bc53a5d93a32 42 {
jdiogo10 0:bc53a5d93a32 43 bool set_pwm = false;
jdiogo10 0:bc53a5d93a32 44 int data = 0;
jdiogo10 0:bc53a5d93a32 45 char data_write[2];
jdiogo10 0:bc53a5d93a32 46 char data_read[1];
jdiogo10 0:bc53a5d93a32 47
jdiogo10 0:bc53a5d93a32 48 // Configure the Temperature sensor device SHT21:
jdiogo10 0:bc53a5d93a32 49 // data_write[0] = SHT21_REG_CONF;
jdiogo10 0:bc53a5d93a32 50 // data_write[1] = 0x00;
jdiogo10 0:bc53a5d93a32 51 // i2c1.write(SHT21_ADDR, data_write, 2, 0);
jdiogo10 0:bc53a5d93a32 52
jdiogo10 0:bc53a5d93a32 53 // Configure serial port
jdiogo10 0:bc53a5d93a32 54 usart1.baud(115200); // Baud rate
jdiogo10 0:bc53a5d93a32 55 //usart1.attach(&usart1_RxIrq, Serial::RxIrq); // RX interrupt handler
jdiogo10 0:bc53a5d93a32 56
jdiogo10 0:bc53a5d93a32 57 // Configure button interrupt
jdiogo10 0:bc53a5d93a32 58 button.fall(&pwmon);
jdiogo10 0:bc53a5d93a32 59 button.rise(&pwmoff);
jdiogo10 0:bc53a5d93a32 60
jdiogo10 0:bc53a5d93a32 61 while(1)
jdiogo10 0:bc53a5d93a32 62 {
jdiogo10 0:bc53a5d93a32 63 if(button_pressed)
jdiogo10 0:bc53a5d93a32 64 {
jdiogo10 0:bc53a5d93a32 65 data = 0;
jdiogo10 0:bc53a5d93a32 66
jdiogo10 0:bc53a5d93a32 67 if(!set_pwm)
jdiogo10 0:bc53a5d93a32 68 {
jdiogo10 0:bc53a5d93a32 69 // Configure pwm
jdiogo10 0:bc53a5d93a32 70 // attiny.period_ms(50); // choose the period of the pwm
jdiogo10 0:bc53a5d93a32 71 // attiny.write(0.50f); // 50% duty cycle
jdiogo10 0:bc53a5d93a32 72
jdiogo10 0:bc53a5d93a32 73 set_pwm = true;
jdiogo10 0:bc53a5d93a32 74 led = 1;
jdiogo10 0:bc53a5d93a32 75 attiny = 1;
jdiogo10 0:bc53a5d93a32 76
jdiogo10 0:bc53a5d93a32 77 flipper.attach(&flip, 3.0); // the address of the function to be attached (flip) and the interval (3 seconds)
jdiogo10 0:bc53a5d93a32 78 }
jdiogo10 0:bc53a5d93a32 79 }
jdiogo10 0:bc53a5d93a32 80 else
jdiogo10 0:bc53a5d93a32 81 {
jdiogo10 0:bc53a5d93a32 82 // attiny.write(0); // Turn off the pwm
jdiogo10 0:bc53a5d93a32 83 flipper.detach();
jdiogo10 0:bc53a5d93a32 84
jdiogo10 0:bc53a5d93a32 85 set_pwm = false;
jdiogo10 0:bc53a5d93a32 86 attiny = 0;
jdiogo10 0:bc53a5d93a32 87 led = 0;
jdiogo10 0:bc53a5d93a32 88
jdiogo10 0:bc53a5d93a32 89 // Write and Read from the slave
jdiogo10 0:bc53a5d93a32 90 data_write[0] = SHT21_REG_DATA;
jdiogo10 0:bc53a5d93a32 91 data_write[1] = data;
jdiogo10 0:bc53a5d93a32 92 i2c1.write(SHT21_ADDR, data_write, 2, false);
jdiogo10 0:bc53a5d93a32 93 i2c1.read(SHT21_ADDR, data_read, 1, false);
jdiogo10 0:bc53a5d93a32 94
jdiogo10 0:bc53a5d93a32 95 usart1.printf("Value = %d\n", data_read);
jdiogo10 0:bc53a5d93a32 96 wait(2.0);
jdiogo10 0:bc53a5d93a32 97
jdiogo10 0:bc53a5d93a32 98 data++;
jdiogo10 0:bc53a5d93a32 99 }
jdiogo10 0:bc53a5d93a32 100 }
jdiogo10 0:bc53a5d93a32 101 }