Seting up registers in Samd based arduino board

Question

I'm trying to setup the BOD33 for Samd51 MCU in th .ino file as a first thing, even before the #include lines in the .ino

// Define the base address for t_SUPC
#define T_SUPC_BASE 0x40001800UL
// Define the offsets for t_BOD33 and t_STATUS
#define T_BOD33_OFFSET 0x10
#define T_STATUS_OFFSET 0x0C
// Set the t_SUPC register
volatile uint32_t *t_SUPC = (volatile uint32_t *)T_SUPC_BASE;
// Set the t_BOD33 register
volatile uint32_t *t_BOD33 = (volatile uint32_t *)(T_SUPC_BASE + T_BOD33_OFFSET);
// Set the t_STATUS register
volatile uint32_t *t_STATUS = (volatile uint32_t *)(T_SUPC_BASE + T_STATUS_OFFSET);
// Clear bit 1 in t_BOD33 and then set it to 1
*t_BOD33 &= ~(1u << 1); // Clear bit 1
// Check bit 0 in t_STATUS and loop while it is 0
while ((*t_STATUS & 0x01) == 0)
{
}
*t_BOD33 &= (0x7D0300u << 1);
*t_BOD33 |= (1u << 1); // Set bit 1 to 1
while ((*t_STATUS & 0x01) == 0)
{
}
while ((*t_STATUS & 0x02) != 0)
{
}
// Clear bit 1 in t_BOD33 and then set it to 1
*t_BOD33 &= ~(1u << 1); // Clear bit 1
while ((*t_STATUS & 0x01) == 0)
{
}
*t_BOD33 |= (1u << 2);
*t_BOD33 &= ~(1u << 3);
*t_BOD33 |= (1u << 1); // Set bit 1 to 1

but I'm getting a compile problem and VScode is throwing those error, which I have no clue why since I never encountered it before the errors are :

""

0_2.ino:28:10: error: expected constructor, destructor, or type conversion before '&=' token
 28 | *t_BOD33 &= ~(1u << 1); // Clear bit 1
 | ^~
0_2.ino:31:1: error: expected unqualified-id before 'while'
 31 | while ((*t_STATUS & 0x01) == 0)
 | ^~~~~
0_2.ino:35:10: error: expected constructor, destructor, or type conversion before '&=' token
 35 | *t_BOD33 &= (0x7D0300u << 1);
 | ^~
0_2.ino:37:10: error: expected constructor, destructor, or type conversion before '|=' token
 37 | *t_BOD33 |= (1u << 1); // Set bit 1 to 1
 | ^~
0_2.ino:38:1: error: expected unqualified-id before 'while'
 38 | while ((*t_STATUS & 0x01) == 0)
 | ^~~~~
0_2.ino:42:1: error: expected unqualified-id before 'while'
 42 | while ((*t_STATUS & 0x02) != 0)
 | ^~~~~
0_2.ino:47:10: error: expected constructor, destructor, or type conversion before '&=' token
 47 | *t_BOD33 &= ~(1u << 1); // Clear bit 1
 | ^~
0_2.ino:48:1: error: expected unqualified-id before 'while'
 48 | while ((*t_STATUS & 0x01) == 0)
 | ^~~~~
0_2.ino:51:10: error: expected constructor, destructor, or type conversion before '|=' token
 51 | *t_BOD33 |= (1u << 2);
 | ^~
0_2.ino:52:10: error: expected constructor, destructor, or type conversion before '&=' token
 52 | *t_BOD33 &= ~(1u << 3);
 | ^~
0_2.ino:53:10: error: expected constructor, destructor, or type conversion before '|=' token
 53 | *t_BOD33 |= (1u << 1); // Set bit 1 to 1
 | ^~

thank you in advance.

Answer 1

The line where the error starts should go to a function e.g. setup(). You can compile the code below.

// Define the base address for t_SUPC
#define T_SUPC_BASE 0x40001800UL
// Define the offsets for t_BOD33 and t_STATUS
#define T_BOD33_OFFSET 0x10
#define T_STATUS_OFFSET 0x0C
// Set the t_SUPC register
volatile uint32_t *t_SUPC = (volatile uint32_t *)T_SUPC_BASE;
// Set the t_BOD33 register
volatile uint32_t *t_BOD33 = (volatile uint32_t *)(T_SUPC_BASE + T_BOD33_OFFSET);
// Set the t_STATUS register
volatile uint32_t *t_STATUS = (volatile uint32_t *)(T_SUPC_BASE + T_STATUS_OFFSET);
void setup() 
{
 // Clear bit 1 in t_BOD33 and then set it to 1
 *t_BOD33 &= ~(1u << 1); // Clear bit 1
 // Check bit 0 in t_STATUS and loop while it is 0
 while ((*t_STATUS & 0x01) == 0)
 {
 }
 *t_BOD33 &= (0x7D0300u << 1);
 *t_BOD33 |= (1u << 1); // Set bit 1 to 1
 while ((*t_STATUS & 0x01) == 0)
 {
 }
 while ((*t_STATUS & 0x02) != 0)
 {
 }
 // Clear bit 1 in t_BOD33 and then set it to 1
 *t_BOD33 &= ~(1u << 1); // Clear bit 1
 while ((*t_STATUS & 0x01) == 0)
 {
 }
 *t_BOD33 |= (1u << 2);
 *t_BOD33 &= ~(1u << 3);
 *t_BOD33 |= (1u << 1); // Set bit 1 to 1
}