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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 66 | mjames | 1 | #include "stm32l1xx_hal.h" |
| 2 | |||
| 3 | #include "switches.h" |
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| 4 | #include "main.h" |
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| 5 | |||
| 6 | const int SHIFT = 1; |
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| 7 | typedef enum |
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| 8 | { |
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| 9 | PH_00 = 0, PH_10 = 2, PH_11 = 3, PH_01 = 1, |
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| 10 | } eGreyCode; |
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| 11 | |||
| 12 | typedef struct |
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| 13 | { |
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| 14 | GPIO_TypeDef *GPIO; |
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| 15 | uint16_t Pin; |
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| 16 | uint16_t Debounce; |
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| 17 | } sGPIOPin; |
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| 18 | |||
| 19 | volatile int push_pos[MAX_PUSHBUTTONS]; |
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| 20 | volatile int sw_count[MAX_PUSHBUTTONS]; //< debounced switch state |
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| 21 | volatile int sw_newstate[MAX_PUSHBUTTONS]; //< debounced switch state |
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| 22 | |||
| 23 | volatile int dial_count[MAX_DIALS]; |
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| 24 | volatile int dial_pos[MAX_DIALS]; |
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| 25 | volatile int dial_last[MAX_DIALS]; // previous debounced switch position |
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| 26 | |||
| 27 | static const sGPIOPin sw_arr[MAX_PUSHBUTTONS] = |
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| 28 | { |
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| 29 | { SW1_PUSH_GPIO_Port, SW1_PUSH_Pin, 10 }, // two debounced switches |
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| 30 | { SW2_PUSH_GPIO_Port, SW2_PUSH_Pin, 10 }, }; |
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| 31 | |||
| 32 | // call this to setup switch states |
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| 33 | void |
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| 34 | InitSwitches (void) |
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| 35 | { |
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| 36 | int i; |
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| 37 | |||
| 38 | for (i = 0; i < MAX_PUSHBUTTONS; i++) |
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| 39 | { |
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| 40 | sw_newstate[i] = 0; |
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| 41 | sw_count[i] = 0; |
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| 42 | push_pos[i] = 0; |
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| 43 | } |
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| 44 | // reset the dial positions |
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| 45 | for (i = 0; i < MAX_DIALS; i++) |
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| 46 | { |
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| 47 | dial_pos[i] = 0; |
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| 48 | } |
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| 49 | dial_count[0] = __HAL_TIM_GET_COUNTER(&htim9) >> SHIFT; |
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| 50 | dial_count[1] = __HAL_TIM_GET_COUNTER(&htim3) >> SHIFT; |
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| 51 | } |
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| 52 | |||
| 53 | // this is the interrupt handler , dealling with the switches |
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| 54 | void |
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| 55 | HandleSwitches (void) |
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| 56 | { |
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| 57 | |||
| 58 | int i; |
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| 59 | |||
| 60 | for (i = 0; i < MAX_PUSHBUTTONS; i++) |
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| 61 | { |
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| 62 | |||
| 63 | int sw = HAL_GPIO_ReadPin (sw_arr[i].GPIO, sw_arr[i].Pin) |
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| 64 | == GPIO_PIN_RESET; |
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| 65 | |||
| 66 | // bouncing, reset counter |
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| 67 | if (sw == sw_newstate[i]) |
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| 68 | { |
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| 69 | sw_count[i] = 0; |
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| 70 | } |
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| 71 | else |
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| 72 | { |
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| 73 | // count up to debounce time |
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| 74 | if (sw_count[i] < sw_arr[i].Debounce) |
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| 75 | { |
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| 76 | sw_count[i]++; |
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| 77 | |||
| 78 | if (sw_count[i] == sw_arr[i].Debounce) |
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| 79 | { |
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| 80 | sw_newstate[i] = sw; |
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| 81 | } |
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| 82 | } |
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| 83 | } |
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| 84 | } |
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| 85 | push_pos[0] = sw_newstate[0]; |
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| 86 | push_pos[1] = sw_newstate[1]; |
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| 87 | |||
| 88 | // use the modulus counters from the timer counters |
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| 89 | int cnt0 = __HAL_TIM_GET_COUNTER(&htim9) >> SHIFT; // counts 4 per step |
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| 90 | int cnt1 = __HAL_TIM_GET_COUNTER(&htim3) >> SHIFT; // counts 4 per step |
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| 91 | |||
| 92 | // always count up, or count down to zero but dont wrap |
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| 93 | |||
| 94 | //if ((dial_pos[0] != 0) || (cnt0 > dial_count[0])) |
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| 95 | dial_pos[0] += cnt0 - dial_count[0]; |
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| 96 | dial_count[0] = cnt0; |
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| 97 | |||
| 98 | // if ((dial_pos[1] != 0) || (cnt1 > dial_count[1])) |
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| 99 | dial_pos[1] += cnt1 - dial_count[1]; |
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| 100 | dial_count[1] = cnt1; |
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| 101 | |||
| 102 | } |
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| 103 |