for NXP KV1x chip, how to modify specific bit in GPCHR register with mask

To modify a specific bit in the GPCHR register of the NXP KV1x chip, you can follow these steps:

1. Read the current value of the GPCHR register into a variable.
2. Define a mask that identifies the specific bit you want to modify. The mask should have a 1 in the bit position you want to modify, and 0s in all other bit positions.
3. Set the value of the bit in the variable using bitwise OR with the mask. This will set the bit to 1 if it was previously 0, without affecting any other bits.
4. Write the modified value back to the GPCHR register.

Here's some sample code that demonstrates this process:

// Read the current value of the GPCHR register
uint32_t gpchr = GPCHR;

// Define a mask for the specific bit to modify
uint32_t mask = (1 << 5); // modify bit 5

// Set the bit using bitwise OR with the mask
gpchr |= mask;

// Write the modified value back to the GPCHR register
GPCHR = gpchr;

In this example, we're modifying bit 5 of the GPCHR register. The mask we've defined has a 1 in bit position 5, so when we perform a bitwise OR with the current value of the register, the bit will be set to 1 without affecting any other bits. Finally, we write the modified value back to the GPCHR register to update the hardware.