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