7 uint16_t track_current_samples[16] = { 0 };
8 uint8_t track_current_head = 0;
9 volatile uint16_t track_current_sum = 0;
10 uint16_t overcurrent_limit = 8796;
11 uint8_t overcurrent_sent = 0;
13 uint16_t input_voltage_samples[16] = { 0 };
14 uint8_t input_voltage_head = 0;
15 volatile uint16_t input_voltage_sum = 0;
17 volatile uint8_t adc_state = 0;
18 volatile uint16_t adc_value = 0;
20 uint16_t track_current_milliamps(void);
21 uint16_t input_voltage_millivolts(void);
23 void monitor_init(void)
28 void monitor_check(void)
32 uint16_t value = adc_value;
36 uint8_t i = track_current_head;
37 track_current_sum -= track_current_samples[i];
38 track_current_samples[i] = value;
39 track_current_sum += value;
40 track_current_head = (i+1)&15;
42 if(track_current_sum>overcurrent_limit)
48 interface_send1(OVERCURRENT);
56 uint8_t i = input_voltage_head;
57 input_voltage_sum -= input_voltage_samples[i];
58 input_voltage_samples[i] = value;
59 input_voltage_sum += value;
60 input_voltage_head = (i+1)&15;
63 adc_state = (adc_state+1)&3;
64 adc_read_async(adc_state>>1);
68 uint8_t monitor_command(const uint8_t *cmd_buf, uint8_t cmd_length)
70 if(cmd_buf[0]==READ_TRACK_CURRENT)
77 uint16_t value = track_current_milliamps();
78 reply[0] = TRACK_CURRENT;
81 interface_send(reply, sizeof(reply));
83 else if(cmd_buf[0]==SET_OVERCURRENT_LIMIT)
88 uint16_t value = (cmd_buf[1]<<8) | cmd_buf[2];
89 if(value>4000) // Safe maximum value
92 // Convert from milliamps: (512+v/1000*0.185/5*1024)*16
93 // multiply by 16384*0.185/5000 = 0.1001101100110b
94 uint16_t v_3 = value*3;
95 overcurrent_limit = 8192+(value>>1)+(v_3>>5)+(v_3>>8)+(v_3>>12);
97 else if(cmd_buf[0]==READ_INPUT_VOLTAGE)
104 uint16_t value = input_voltage_millivolts();
105 reply[0] = INPUT_VOLTAGE;
108 interface_send(reply, sizeof(reply));
111 return INVALID_COMMAND;
116 uint16_t track_current_milliamps(void)
118 uint16_t value = track_current_sum;
120 // Convert to milliamps: (v/16*5/1024-2.5)*1000/0.185
121 if(value<8192) // Ignore negative current readings
127 // multiply by 5000/0.185/16384 = 1.1010011001001b
128 int16_t v_3 = value*3;
129 return (v_3>>1)+(value>>3)+(v_3>>7)+(value>>10)+(v_3>>13);
133 uint16_t input_voltage_millivolts(void)
135 uint16_t value = input_voltage_sum;
137 // Convert to millivolts: (v/16*5/1024)*1000*11
138 // multiply by 55000/16384 = 11.0101101101100b
139 uint16_t v_3 = value*3;
140 return v_3+(value>>2)+(v_3>>5)+(v_3>>8)+(v_3>>11);
143 static inline void adc_complete(uint16_t value)
149 ADC_SET_CALLBACK(adc_complete)