I2c - mma7760 test asynch

main.cpp

#include <stdio.h>
#include "mbed.h"


#define MMA7660_ADDRESS     0x98

volatile int gevent;
volatile bool done;
volatile const char * why;

void callback(int event) {
    done = true;
    gevent = event;
    switch(event) {
    case I2C_EVENT_ERROR:
        why = "Generic I2C error";
        break;
    case I2C_EVENT_ERROR_NO_SLAVE:
        why = "Slave did not reply";
        break;
    case I2C_EVENT_TRANSFER_COMPLETE:
        break;
    case I2C_EVENT_TRANSFER_EARLY_NACK:
        why = "Early NAK received";
        break;
    default:
        why = "Unknown Error";
        break;
    }
}


int main(void)
{
    I2C i2c(PTE25, PTE24);
    event_callback_t event;

    event.attach(callback);
    why = "running...";
    done = false;
    printf("Testing MMA7660 on the mbed application shield \n");
    char mode, mma_reg[3]={0x07,0x07,0x07};

    // Read mode
    int rc = i2c.transfer(MMA7660_ADDRESS, mma_reg, 1, &mode, 1, event, I2C_EVENT_ALL, false);
    if (rc) {
        printf("Failed to start transfer\n");
        return -1;
    }
    while (!done) {
        sleep();
    }

    // set MMA7660 to active
    done = false;
    mode |= 0x1;
    rc = i2c.transfer(MMA7660_ADDRESS, &mode, 1, NULL, 0, event, I2C_EVENT_ALL, false);
    if (rc) {
        printf("Failed to start transfer\n");
        return -1;
    }
    while (!done) {
        sleep();
    }

    if (gevent != I2C_EVENT_TRANSFER_COMPLETE) {
        printf("Failed to complete the transfer, event: %d \n", gevent);
        return -1;
    }

    // Test connection
    done = false;
    rc = i2c.transfer(MMA7660_ADDRESS, NULL, 0, &mode, 1, event, I2C_EVENT_ALL, false);
    if (rc) {
        printf("Failed to start transfer\n");
        return -1;
    }
    while (!done) {
        sleep();
    }
    if (mode != 0) {
        printf("Failed to find MMA7660 \n");
        return -1;
    }

    if (gevent != I2C_EVENT_TRANSFER_COMPLETE) {
        printf("Failed to complete the transfer, event: %d \n", gevent);
        return -1;
    }

    done = false;
    rc = i2c.transfer(MMA7660_ADDRESS, NULL, 0, NULL, 0, event, I2C_EVENT_ALL, false);
    if (rc) {
        printf("Failed to start transfer\n");
        return -1;
    }
    while (!done) {
        sleep();
    }

    if (gevent != I2C_EVENT_TRANSFER_COMPLETE) {
        printf("Failed to complete the transfer, event: %d \n", gevent);
        return -1;
    }

    printf("{{success}}\r\n");
    return 1;
}