TMS570LC4357: USE MOSI-3 pin as GPIO

Dear All,

TMS570LC have only 2 ports(A & B) for GPIO and each port having 8 pins mean only 2*8 pins are available for GPIO output,

My requirement is of 40 GPIOs So I try to use Peripherals pins as GPIO

I want to use SPI3-MOSI pin as GPIO for that I made some changes as below

/---------------------------------------------------------------------------------------------------------

int main(void)
{
gioInit();
spiInit();
dataconfig1_t.CS_HOLD = 1;
dataconfig1_t.WDEL = FALSE;

gioToggleBit(gioPORTB, 7);            // LED
gioToggleBit(gioPORTB, 6);            // LED
spiREG3->PC0 &= ~(0x00FF0000); //MoSI as GPIO
spiREG3->PC1 |= 0x00FF0000; // Direction as OUTPUT
while(1)
{

spiREG3->PC3 |= (1 << SPI_PIN_SIMO_3);       // Set as HIGH
delay_v();
spiREG3->PC3 &= ~(1 << SPI_PIN_SIMO_3);   // Set as LOW
delay_v();
gioToggleBit(gioPORTB, 7);                      // LED
gioToggleBit(gioPORTB, 6);                    // LED
delay_v();
}/* USER CODE END */

return 0;
}

-------------------------------------------------------------------------------------/

Above code is generated from HALCoGen software 

In which SPI is initilize and try to set MOSI as GPIO as per SFR

PROBLEM - MOSI pin remain in HIGH state only its not working as per requirements

So kindly let me know the Correct way to implement the logic