static uint32_t derive_interval(uint32_t num)
{
uint32_t interval;
if ((DETAILED_STATS) && (LOG2_STATS)) {
/* Use a logarithmic method to generate geometric variates in order to
* populate the result table evenly across all buckets */
/* Static exponent mask, picking the mask as tightly as possible reduces the
* probability of discarded values, which reduces the computing overhead
* between test iterations */
static uint32_t exp_mask = 0;
if (exp_mask == 0) {
/* non-constant initializer */
exp_mask = (2 << bitarithm_msb(TEST_LOG2NUM)) - 1;
print_str("exp_mask = ");
print_u32_hex(exp_mask);
print("\n", 1);
print_str("max interval = ");
print_u32_dec((2 << exp_mask) - 1);
print("\n", 1);
}
/* Pick an exponent based on the top bits of the number */
/* exponent will be a number in the interval [0, log2(TEST_NUM) + 1] */
unsigned int exponent = ((num >> (32 - 8)) & exp_mask);
if (exponent == 0) {
/* Special handling to avoid the situation where we never see a zero */
/* We could also have used an extra right shift in the else case,
* but the state grouping also groups 0 and 1 in the same bucket, which means that they are twice as likely */
interval = bitarithm_bits_set(num) & 1;
}
else {
interval = (1 << exponent);
interval |= (num & (interval - 1));
}
}
else {
int main()
{
init_platform();
XIOModule_Initialize(&iomod_inst, 0);
wait_ms(&iomod_inst,1000);
codec_init(&iomod_inst);
wait_ms(&iomod_inst,1000);
print("Codec Initialized\r\n");
print("Reading back registers\r\n");
int i;
uint8_t regData;
for(i = 1; i < 9; i++)
{
regData = codec_read(&iomod_inst,i);
print("Address ");
print_u32_hex((u32)i);
print(" ");
print_u32_hex((u32)regData);
print("\r\n");
}
print("Waiting 5 seconds for codec HPF to stabilize...\r\n");
wait_ms(&iomod_inst,5000);
u8 numCharsRet;
clearInpBuffer();
while(1)
{
print("Please select the channel (L/R)\r\n> ");
numCharsRet = serial_read_line(serialInputBuffer,SERIAL_INPUT_BUFFER_LEN);
if(numCharsRet > 0)
{
if((serialInputBuffer[0] == 'l') || (serialInputBuffer[0] == 'L'))
{
selectedChannel = Left;
break;
}
else if((serialInputBuffer[0] == 'r') || (serialInputBuffer[0] == 'R'))
{
selectedChannel = Right;
break;
}
}
print("Invalid channel selection.\r\n");
}
clearInpBuffer();
RunSineTest();
for(i = 0; i < MAX_INPUT_LEN; i++)
{
xil_printf("%d\r\n",input_buffer[i]);
}
print("End of samples\r\n");
return 0;
}
