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encoder.c
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encoder.c
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/* ========================================
*
* Concept: https://www.best-microcontroller-projects.com/rotary-encoder.html
*
* ========================================
*/
#include "encoder.h"
#include "utilities.h" //dbg_printf
#define READ_ENCA 0 //((encA_PS & encA_MASK) >> encA_SHIFT)
#define READ_ENCB 0 //((encB_PS & encB_MASK) >> encB_SHIFT)
uint8_t out1, out2, out3;
uint8_t prevNextCode = 0;
uint16_t store = 0;
static int8_t c, val;
void updateEncoder()
{
val = read_rotary();
if(val) {
c += val;
dbg_printf("Count: %d\n", c);
}
}
// A vald CW or CCW move returns 1, invalid returns 0.
int8_t read_rotary() {
static int8_t rot_enc_table[] = {0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0};
prevNextCode <<= 2;
if (READ_ENCB) prevNextCode |= 0x02;
if (READ_ENCA) prevNextCode |= 0x01;
prevNextCode &= 0x0f;
// If valid then store as 16 bit data.
if (rot_enc_table[prevNextCode] ) {
store <<= 4;
store |= prevNextCode;
//if (store==0xd42b) return 1;
//if (store==0xe817) return -1;
if ((store&0xff)==0x2b) return -1;
if ((store&0xff)==0x17) return 1;
}
return 0;
}
/* [] END OF FILE */