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Single chip microcomputer STM32L151CCU6
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1206RGB (single)
The button scan result and the actual button pressed follow a specific relationship. Here are some examples of how the scan results map to the buttons:
// K100XE7K180XB7
// K110XEBK190XBB
// K120XEDK200XBD
// K130XEEK210XBE
// K140XD7K220X77
// K150XDBK230X7B
// K160XDDK240X7D
// K170XDEK250X7E
#include // Includes internal resources of the microcontroller
__CONFIG(0x1832); // Configuration word: watchdog off, power-on delay on, power-down detection off, low-voltage programming off, encryption, 4M crystal HS oscillator
int result; // Variable to store the scan result
void delay(); // Declaration of delay function
void init(); // Declaration of I/O port initialization function
void scan(); // Declaration of key scanning function
void display(int x); // Declaration of display function
//---------------------------------------------------
// Main program
void main() {
while(1) { // Infinite loop
init(); // Call initialization function
scan(); // Call button scan function
display(result); // Call display function with the result
}
}
//---------------------------------------------------
// Initialization function
void init() {
ADCON1 = 0x07; // Set A port as general I/O
TRISA = 0x0F; // Set upper 2 bits of A port as output, lower 4 bits as input
TRISC = 0xF0; // Set upper 4 bits of C port as input, lower 4 bits as output
TRISD = 0x00; // Set D port as output
PORTA = 0xFF;
PORTD = 0xFF; // Clear all displays first
}
//---------------------------------------------------
// Button scan program
void scan() {
PORTC = 0xF7; // Set C3 to low, others high
asm("nop"); // Delay for stability
result = PORTC; // Read back the value from PORTC
result &= 0xF0; // Clear lower 4 bits
if (result != 0xF0) { // If not all 1s, a key is pressed
result |= 0x07; // Add lower 4 bits to identify the key
} else { // Otherwise, check next row
PORTC = 0xFB; // Set C2 to low
asm("nop");
result = PORTC;
result &= 0xF0;
if (result != 0xF0) {
result |= 0x0B;
} else {
PORTC = 0xFD; // Set C1 to low
asm("nop");
result = PORTC;
result &= 0xF0;
if (result != 0xF0) {
result |= 0x0D;
} else {
PORTC = 0xFE; // Set C0 to low
asm("nop");
result = PORTC;
result &= 0xF0;
if (result != 0xF0) {
result |= 0x0E;
} else {
result = 0xFF; // No key pressed
}
}
}
}
}
//---------------------------------------------------
// Display program
void display(int x) {
switch(result) {
case 0xE7: // K10
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0xC0; PORTA = 0x1F; delay(); break;
case 0xEB: // K11
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0xF9; PORTA = 0x1F; delay(); break;
case 0xED: // K12
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0xA4; PORTA = 0x1F; delay(); break;
case 0xEE: // K13
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0xB0; PORTA = 0x1F; delay(); break;
case 0xD7: // K14
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0x99; PORTA = 0x1F; delay(); break;
case 0xDB: // K15
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0x92; PORTA = 0x1F; delay(); break;
case 0xDD: // K16
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0x82; PORTA = 0x1F; delay(); break;
case 0xDE: // K17
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0xF8; PORTA = 0x1F; delay(); break;
case 0xB7: // K18
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0x80; PORTA = 0x1F; delay(); break;
case 0xBB: // K19
PORTD = 0xF9; PORTA = 0x2F; delay();
PORTD = 0x90; PORTA = 0x1F; delay(); break;
case 0xBD: // K20
PORTD = 0xA4; PORTA = 0x2F; delay();
PORTD = 0xC0; PORTA = 0x1F; delay(); break;
case 0xBE: // K21
PORTD = 0xA4; PORTA = 0x2F; delay();
PORTD = 0xF9; PORTA = 0x1F; delay(); break;
case 0x77: // K22
PORTD = 0xA4; PORTA = 0x2F; delay();
PORTD = 0xA4; PORTA = 0x1F; delay(); break;
case 0x7B: // K23
PORTD = 0xA4; PORTA = 0x2F; delay();
PORTD = 0xB0; PORTA = 0x1F; delay(); break;
case 0x7D: // K24
PORTD = 0xA4; PORTA = 0x2F; delay();
PORTD = 0x99; PORTA = 0x1F; delay(); break;
case 0x7E: // K25
PORTD = 0xA4; PORTA = 0x2F; delay();
PORTD = 0x92; PORTA = 0x1F; delay(); break;
case 0xFF: // No button pressed
PORTD = 0x8E; PORTA = 0x2F; delay();
PORTD = 0x8E; PORTA = 0x1F; delay(); break;
}
}
//---------------------------------------------------
// Delay function
void delay() {
int i; // Define a variable for counting
for(i = 0x100; i--;); // Simple delay loop
}
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