Problems with XOR on Bluepill (STM32F103)
Hi Community
It shouldn't be so difficult, but I'm having problems with the XOR function on CubeIde and a STM32F103 (Bluepill Board)
I have this buffer:
#define NUM_CHANNELS 17
volatile uint16_t ihcData[NUM_CHANNELS];
I have these 2 functions that are working perfectly to clear a bit and to set a bit in this buffer:
uint8_t setOutput(uint8_t port, uint8_t channel)
{
if ( (port < 1) || (port > 16) || (channel < 1) || (channel > 8)) return 3; // Indicate that values are out of range
ihcData[channel -1] |= (1 << (port -1));
return (ihcData[channel -1] & (1 << (port -1)) ) ? 1 : 0; // To indicate what the channel/port is set to
}
uint8_t clrOutput(uint8_t port, uint8_t channel)
{
if ( (port < 1) || (port > 16) || (channel < 1) || (channel > 8)) return 3; // Indicate that values are out of range
ihcData[channel -1] &= ~(1 << (port -1));
return (ihcData[channel -1] & (1 << (port -1)) ) ? 1 : 0; // To indicate what the channel/port is set to
}
In the debugger the bit's are set and cleared correctly in the array as expected
And then I have this function that was supposed to toggle one bit in the buffer.
But whatever I tries it is not working !!
uint8_t toggleOutput(uint8_t port, uint8_t channel)
{
if ( (port < 1) || (port > 16) || (channel < 1) || (channel > 8)) return 3; // Indicate that values are out of range
ihcData[channel -1] ^= (1 << (port -1)); // Not working
// ihcData[channel -1] = ihcData[channel -1] ^ (1 << (port -1)); // Not working
// ihcData[4] ^= (1 << 4); // Not working
// ihcData[4] = ihcData[4] ^ 0x00FF; // Not working
return (ihcData[channel -1] & (1 << (port -1)) ) ? 1 : 0; // To indicate what the channel/port is set to
}
None of the attempts in the toggleOutput function are working, and I'm sure that I get into the function and the code is running since I can set the return value to a fixed value, or I can set or clear the bit value with one of the 2 working functions shown above, and the toggleOutput return function is given the correct return value (If bit is set to 1 or 0)
What am I don't wrong since the XOR function is not working ?
BTW. I'm using CubeIDE 1.14.0
Br
Steen