converting a string into binary for data transfer

[Bopamo]

I am working on an embedded project that requires me to transmit data via SPI using a processor that doesn't have built in SPI ports.

I was wondering if there was a simple library/algorithm/scheme in C++ that can allow me to convert a string into its binary form so I can clock each bit in on a rising clock edge. Thanks!!!!

[laserlight]

What exactly do you mean by the binary form of a string? When you say a string, are you talking about std::string or a null terminated C-style string?

[Memloop]

This can easily be generalized to an entire string:

uint8_t text[] = "Hello";
uint8_t i;
uint8_t *p = &text[0];

/* Transmit the first character. */
for (i = 0; i < 8; ++i)
{
    /* Wait for next edge */
    if ((uint8_t)(1 << i) & *p)
    {
        OUT_PORT |= 1 << PIN_NUMBER;
    }
    else
    {
        OUT_PORT &= ~(1 << PIN_NUMBER);
    }
}

You can replace the for loop with a static counter if you need to do the sending inside an ISR.