void fm_gets(unsigned char *s, unsigned long len)
{
unsigned long head, tail;
head = fm_head;
tail = fm_tail;
if(head != tail)
{
FM_CS_ENABLE();
ssi_write(FM_READ);
ssi_write(tail>>16);
ssi_write(tail>>8);
ssi_write(tail);
ssi_wait();
while(len--)
{
if(head != tail)
{
*s++ = ssi_readwrite(0xff);
if(++tail >= fm_bytes)
{
tail = 0;
}
}
else
{
break;
}
}
FM_CS_DISABLE();
fm_tail = tail;
}
void ssi_off(void)
{
ssi_wait();
GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_5); //SCK, SI = gpio
GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_5, 0); //SCK, SI = low
return;
}
