Nios SPI and alt_u32 bit array

Hello guys. I have a little doubt.. Hope someone could help me..

I'm using the standard altera function to tx and rx on a SPI.

The proto is:

int alt_avalon_spi_command(alt_u32 base, alt_u32 slave, alt_u32 write_length, const alt_u8* wdata, alt_u32 read_length, alt_u8* read_data, alt_u32 flags)

So if i want to transmit the array:

uint32_t my_array[32]={.....};

I would call:

alt_avalon_spi_command(SPI_BASE, 0, 32, my_array, 0, NULL,0);

By the way, as you see, the function alt_avalon_spi_command wants a 8-bit unsigned pointer. So how can I figure out if I want to transmit a 32bit unsignet variable at a time ?

Intuitively I would do something like that:

alt_avalon_spi_command(SPI_BASE, 0, 32*4, (uint8_t*)my_array, 0, NULL,0);

What do you recommend ?