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41 lines
1.2 KiB
41 lines
1.2 KiB
8 years ago
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/* AudioContolSGTL5000_Extended.h
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*
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* Purpose: Extends the functionality of the AudioControlSGTL5000 from the Teensy Audio Library
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*
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* Created: Chip Audette, Nov 2016
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*
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* License: MIT License. Use at your own risk
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*/
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#ifndef _AudioControlSGTL5000_Extended
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#define _AudioControlSGTL5000_Extended
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class AudioControlSGTL5000_Extended : public AudioControlSGTL5000
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{
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public:
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AudioControlSGTL5000_Extended(void) {};
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bool micBiasEnable(void) {
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return micBiasEnable(3.0);
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}
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bool micBiasEnable(float volt) {
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//in the SGTL5000 datasheet see Table 29. CHIP_MIC_CTRL Register 0x002A
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///bias resistor is set via bits 9-8 (out of 15-0)
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uint16_t bias_resistor_setting = 1 << 8; //set the bit for the registor to enable 2kOhm
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//bias voltage is set via bits 6-4 (out of 15-0)
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uint16_t bias_voltage_setting = ((uint16_t)((volt - 1.25) / 0.250 + 0.5)) << 4;
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//combine the two settings and issue the command
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return write(0x002A, bias_voltage_setting | bias_resistor_setting);
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}
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bool micBiasDisable(void) {
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//in the SGTL5000 datasheet see Table 29. CHIP_MIC_CTRL Register 0x002A
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return write(0x002A, 0x00);
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}
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};
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#endif
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