[En-Nut-Discussion] TWI and Ethernut

[Ole Reinhardt]

Hello

> Has anyone 
> [...]
> example code of using TWI?

Using TWI with avr is quite simple. Everything you need you'll find in 
/nut/include/dev/twif.h. Always think about using a mutex in a multi
threaded application to avoid ressource conflicts.

Just a short example:

char PCF8575_OutW(u_char sub_addr, u_char* data)
{
    u_char addr;
    addr = PCF8575_ADR_BASE | (sub_addr & 0x07);
    if (TwMasterTransact(addr, data, 2, NULL, 0, I2C_TIMEOUT) == -1)
        return -1; 
    else 
        return 0;
}

char PCF8575_InW(u_char sub_addr, u_char* data)
{
    u_char addr;
    addr = PCF8575_ADR_BASE | (sub_addr & 0x07);
    if (TwMasterTransact(addr, NULL, 0, data, 2, I2C_TIMEOUT) == -1)
        return -1; 
    else 
        return 0;
}

Bye,

Ole Reinhardt


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