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30 mjames 1 
#include "stm32l1xx_hal.h"
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#include "switches.h"
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#include "main.h"
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typedef enum
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{
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  PH_00 = 0, PH_10 = 2, PH_11 = 3, PH_01 = 1,
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} eGreyCode;
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typedef struct
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{
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  GPIO_TypeDef *GPIO;
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  uint16_t Pin;
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  uint16_t Debounce;
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} sGPIOPin;
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volatile int push_pos[MAX_PUSHBUTTONS];
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volatile int sw_count[MAX_PUSHBUTTONS]; //< debounced switch state
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volatile int sw_newstate[MAX_PUSHBUTTONS]; //< debounced switch state
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volatile int dial_count[MAX_DIALS];
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volatile int dial_pos[MAX_DIALS];
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volatile int dial_last[MAX_DIALS]; // previous debounced switch position
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static const sGPIOPin sw_arr[MAX_PUSHBUTTONS] =
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  {
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    { SW1_PUSH_GPIO_Port, SW1_PUSH_Pin, 10 }, // two debounced switches
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        { SW2_PUSH_GPIO_Port, SW2_PUSH_Pin, 10 }, };
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// call this to setup switch states
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void
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InitSwitches (void)
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{
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  int i;
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  for (i = 0; i < MAX_PUSHBUTTONS; i++)
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    {
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      sw_newstate[i] = 0;
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      sw_count[i] = 0;
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      push_pos[i] = 0;
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    }
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// reset the dial positions
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  for (i = 0; i < MAX_DIALS; i++)
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    {
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      dial_pos[i] = 0;
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    }
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  dial_count[0] = __HAL_TIM_GET_COUNTER(&htim9) >> 2;
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  dial_count[1] = __HAL_TIM_GET_COUNTER(&htim3) >> 2;
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}
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// this is the interrupt handler , dealling with the switches
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void
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HandleSwitches (void)
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{
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  int i;
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  for (i = 0; i < MAX_PUSHBUTTONS; i++)
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    {
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      int sw = HAL_GPIO_ReadPin (sw_arr[i].GPIO, sw_arr[i].Pin)
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          == GPIO_PIN_RESET;
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      // bouncing, reset counter
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      if (sw == sw_newstate[i])
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        {
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          sw_count[i] = 0;
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        }
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      else
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        {
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          // count up to debounce time
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          if (sw_count[i] < sw_arr[i].Debounce)
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            {
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              sw_count[i]++;
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              if (sw_count[i] == sw_arr[i].Debounce)
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                {
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                  sw_newstate[i] = sw;
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                }
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            }
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        }
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    }
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  push_pos[0] = sw_newstate[0];
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  push_pos[1] = sw_newstate[1];
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  int cnt0 = __HAL_TIM_GET_COUNTER(&htim9) >> 2;  // counts 4 per step
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  int cnt1 = __HAL_TIM_GET_COUNTER(&htim3) >> 2;  // counts 4 per step
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  // always count up, or count down to zero but dont wrap
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  if ((dial_pos[0] != 0) || (cnt0 > dial_count[0]))
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    dial_pos[0] += cnt0 - dial_count[0];
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  dial_count[0] = cnt0;
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  if ((dial_pos[1] != 0) || (cnt1 > dial_count[1]))
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    dial_pos[1] += cnt1 - dial_count[1];
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  dial_count[1] = cnt1;
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}
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