AVR Memory Architecture : Arduino / ATmega328p

 avr_adc.h

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1 

44 #ifndef AVR_ADC_H_

45 #define AVR_ADC_H_

46 

47 #include <avr/io.h>

48 

49 #pragma message ( "avr_adc.h included" )

50 

55 #define ADC0 0x00

56 #define ADC1 0x01

57 #define ADC2 0x02

58 #define ADC3 0x03

59 #define ADC4 0x04

60 #define ADC5 0x05

61 #define ADC6 0x06

62 #define ADC7 0x07

63 #define ADC8 0x08

64 #define VBG 0x0E

65 #define GND 0x0F

66 #define ADC_PIN_MASK 0x0F

73 #define ADC_VOLTAGE_REFERENCE_AREF (0<<REFS0)

74 #define ADC_VOLTAGE_REFERENCE_AVCC (1<<REFS0)

75 #define ADC_VOLTAGE_REFERENCE_IREF (1<<REFS1) | (1<<REFS0)

76 #define ADC_VOLTAGE_REFERENCE_MASK (1<<REFS1) | (1<<REFS0)

83 #define ADC_PRESCALER_2 (1<<ADPS0)

84 #define ADC_PRESCALER_4 (1<<ADPS1)

85 #define ADC_PRESCALER_8 (1<<ADPS1) | (1<<ADPS0)

86 #define ADC_PRESCALER_16 (1<<ADPS2)

87 #define ADC_PRESCALER_32 (1<<ADPS2) | (1<<ADPS0)

88 #define ADC_PRESCALER_64 (1<<ADPS2) | (1<<ADPS1)

89 #define ADC_PRESCALER_128 (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0)

90 #define ADC_PRESCALER_MASK (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0)

97 #define ADC_TEMP_TOS 0x01

98 #define ADC_TEMP_K 0x01

99 

105 typedef struct ADC_ConfigData

106 {

107  uint8_t VoltageReference;

108  uint8_t Prescaler;

109 } ADC_ConfigData;

116 inline void ADC_DisableInterrupt();

117 inline void ADC_EnableInterrupt();

124 inline void ADC_Init(ADC_ConfigData Data);

125 inline void ADC_DeInit();

132 uint16_t ADC_ReadPin(uint8_t Pin);

133 uint16_t ADC_ReadTemperature();

141 inline void ADC_DisableInterrupt()

142 {

143 

144 }

145 

151 inline void ADC_EnableInterrupt()

152 {

153 

154 }

155 

162 inline void ADC_Init(ADC_ConfigData Data)

163 {

164  ADMUX = Data.VoltageReference | VBG; // Set Voltage Reference and Connect the ADC H/W to GND

165  ADCSRA = (1<<ADEN) | Data.Prescaler;

166 }

167 

173 inline void ADC_DeInit()

174 {

175  ADMUX = 0x00;

176  ADCSRA = 0x00;

177  ADC_DisableInterrupt();

178 }

179 

186 uint16_t ADC_ReadPin(uint8_t Pin)

187 {

188  uint8_t Low, High;

189  ADMUX = (ADMUX & ADC_VOLTAGE_REFERENCE_MASK) | Pin;

190  ADCSRA |= (1<<ADSC);

191  while (ADCSRA & (1<<ADSC));

192  Low = ADCL;

193  High = ADCH;

194  return (High<<8) | Low;

195 }

196 

202 uint16_t ADC_ReadTemperature()

203 {

204  uint8_t Low, High;

205  ADMUX = ADC_VOLTAGE_REFERENCE_IREF | ADC8;

206  ADCSRA |= (1<<ADSC);

207  while (ADCSRA & (1<<ADSC));

208  Low = ADCL;

209  High = ADCH;

210  return (((High<<8) | Low) - ADC_TEMP_TOS) / ADC_TEMP_K;

211 }

212 

213 #endif /* AVR_ADC_H_ */