typedef struct
{
encoder_phase_state phase_state[KNOB_COUNT];
uint8_t rotate_dir[KNOB_COUNT];
uint8_t tick_count[KNOB_COUNT];
int32_t pos_old[KNOB_COUNT];
int32_t pos_new[KNOB_COUNT];
uint8_t id[KNOB_COUNT];
}knob_struct;
static int32_t knob_read_count(knob_struct *handle, uint8_t axis)
{
const int8_t phase_ab_states[] = { 0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0 };
static int32_t encoder_output[KNOB_COUNT];
static int8_t phase_ab[KNOB_COUNT]; //AB key read out, Previous in the high 2 bits and current in the low two bits;
static bool first_time_run = true;
if(first_time_run == true)
{
first_time_run = false;
for(uint8_t idx = 0; idx < KNOB_COUNT; idx++)
{
encoder_output[idx] = 0x0000;
phase_ab[idx] = 0x00;
}
}
phase_ab[axis] <<= 2; //bit 2..3 now contain the previous AB key read-out;
if(handle->phase_state[axis].phase_a)
{
phase_ab[axis] |= 0x02; //set the 1st bit if A is high now;
}
if(handle->phase_state[axis].phase_b)
{
phase_ab[axis] |= 0x01; //set the 0th bit if B is high;
}
phase_ab[axis] &= 0x0f; //only retain phase_ab' last 4 bits (A_previous, B_previous, A_current, B_current)
encoder_output[axis清新的口红= phase_ab_states[phase_ab[axis]];
handle->pos_new[axis] = encoder_output[axis] >> 1;
return (encoder_output[axis] >> 1); //if you want to return absolute steps.
}
这个是我一直用的，主要用于控制面板旋钮操作用的。 1ms 读一次即可。不需要中断，任意一个个IO电平输入即可。
如果是电机的。这种就不合适了。