MBED_DEMOS / Mbed 2 deprecated IoT_World_Hackathon_WiGo_NSP_Demo

Demo starter application to connect WiGo to NSP and expose on-board sensors

Dependencies:   NVIC_set_all_priorities cc3000_hostdriver_mbedsocket mbed nsdl_lib TEMT6200 TSI Wi-Go_eCompass_Lib_V3 WiGo_BattCharger

This is the mbed project for the IoT World Hackathon event, June 17th and 18th in Palo Also.

The setup instructions for participants are at the Setup page of this wiki:

http://mbed.org/teams/MBED_DEMOS/code/IoT_World_Hackathon_WiGo_NSP_Demo/wiki/Setup-Guide-for-the-IoT-World-Hackathon

I2C_busreset/I2C_busreset.cpp

Committer:
michaeljkoster
Date:
2014-07-09
Revision:
18:11b9d98ecae2
Parent:
0:07581223f90c

File content as of revision 18:11b9d98ecae2:

/**************************************************************************************************
 *****                                                                                        *****
 *****  Name: KL25Z I2C_busreset.cpp                                                          *****
 *****  Date: 24/11/2013                                                                      *****
 *****  Auth: Frank Vannieuwkerke                                                             *****
 *****  Func: library for unblocking I2C bus on KL25Z board                                   *****
 *****  Info: MPL3115A2-AN4481                                                                *****
 **************************************************************************************************/

#include "I2C_busreset.h"

void I2C_busreset(void)
{
    I2C0->C1 &= 0x7f;                 // Disable I2C0 bus
    I2C1->C1 &= 0x7f;                 // Disable I2C1 bus
    PORTE->PCR[1] = PORT_PCR_MUX(1);  // PTE1 Alt1 (pin)
    PORTE->PCR[0] = PORT_PCR_MUX(1);  // PTE0 Alt1 (pin)
    PORTE->PCR[24] = PORT_PCR_MUX(1); // PTE24 Alt1 (pin)
    PORTE->PCR[25] = PORT_PCR_MUX(1); // PTE25 Alt1 (pin)
    if((PTE->PDIR & 0x3) != 3)        // When PTE0 / PTE1 are not 1 : I2C1 bus lock-up
    {
        PTE->PDDR |= 0x2;             // Set PTE1 as a GPIO output so we can bit bang it
        PTE->PDOR |= 0x2;             // Set PTE1 (SCL) pin high;
        wait_ms(1);
        while(!(PTE->PDIR & 0x1))     // bit bang SCL until the offending device releases the bus
        {   
            PTE->PDOR &= 0xfffffffd;  // Set PTE1 (SCL) pin low;
            wait_ms(1);
            PTE->PDOR |= 0x2;         // Set PTE1 (SCL) pin high;
            wait_ms(1);
        }
    }
    if((PTE->PDIR & 0x03000000) != 0x03000000)  // When PTE24 / PTE25 are not 1 : I2C0 bus lock-up
    {
        PTE->PDDR |= 0x01000000;      // Set PTE24 as a GPIO output so we can bit bang it
        PTE->PDOR |= 0x01000000;      // Set PTE24 (SCL) pin high;
        wait_ms(1);
        while(!(PTE->PDIR & 0x1))     // bit bang SCL until the offending device releases the bus
        {   
            PTE->PDOR &= 0xfeffffff;  // Set PTE24 (SCL) pin low;
            wait_ms(1);
            PTE->PDOR |= 0x01000000;  // Set PTE24 (SCL) pin high;
            wait_ms(1);
        }
    }
    // Reinstate I2C bus pins
    PORTE->PCR[1] = PORT_PCR_MUX(6);  // PTE1 Alt6 (SCL)
    PORTE->PCR[0] = PORT_PCR_MUX(6);  // PTE0 Alt6 (SDA)
    PORTE->PCR[24] = PORT_PCR_MUX(5); // PTE24 Alt6 (SCL)
    PORTE->PCR[25] = PORT_PCR_MUX(5); // PTE25 Alt6 (SDA)
    I2C0->C1 |= 0x80;                 // Enable I2C0 bus
    I2C1->C1 |= 0x80;                 // Enable I2C1 bus
}