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How To: Digital/Analog Converter

Core Module contains two analog outputs: DAC0 and DAC1. These are real analog outputs, not just PWM outputs.

Both channels can run completely separately with different sample rates.

References

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In this example, there’s a sine wave lookup table, you need to prepare the output buffer first.

The sampling is set on TWR_DAC_SAMPLE_RATE_16K. This together generates 125 Hz sine-wave on DAC0 output.

Sine Wave Generator Code Example

#include <application.h>const uint8_t sine_wave[] = {0x80, 0x86, 0x8C, 0x93,0x99, 0x9F, 0xA5, 0xAB,0xB1, 0xB6, 0xBC, 0xC1,0xC7, 0xCC, 0xD1, 0xD5,0xDA, 0xDE, 0xE2, 0xE6,0xEA, 0xED, 0xF0, 0xF3,0xF5, 0xF8, 0xFA, 0xFB,0xFD, 0xFE, 0xFE, 0xFF,0xFF, 0xFF, 0xFE, 0xFE,0xFD, 0xFB, 0xFA, 0xF8,0xF5, 0xF3, 0xF0, 0xED,0xEA, 0xE6, 0xE2, 0xDE,0xDA, 0xD5, 0xD1, 0xCC,0xC7, 0xC1, 0xBC, 0xB6,0xB1, 0xAB, 0xA5, 0x9F,0x99, 0x93, 0x8C, 0x86,0x80, 0x7A, 0x74, 0x6D,0x67, 0x61, 0x5B, 0x55,0x4F, 0x4A, 0x44, 0x3F,0x39, 0x34, 0x2F, 0x2B,0x26, 0x22, 0x1E, 0x1A,0x16, 0x13, 0x10, 0x0D,0x0B, 0x08, 0x06, 0x05,0x03, 0x02, 0x02, 0x01,0x01, 0x01, 0x02, 0x02,0x03, 0x05, 0x06, 0x08,0x0B, 0x0D, 0x10, 0x13,0x16, 0x1A, 0x1E, 0x22,0x26, 0x2B, 0x2F, 0x34,0x39, 0x3F, 0x44, 0x4A,0x4F, 0x55, 0x5B, 0x61,0x67, 0x6D, 0x74, 0x7A};void application_init(void){    twr_dac_init(TWR_DAC_DAC0);    twr_dac_config_t dac_config;    dac_config.buffer = (uint8_t*)sine_wave;    dac_config.length = sizeof(sine_wave);    dac_config.data_size = TWR_DAC_DATA_SIZE_8;    dac_config.mode = TWR_DAC_MODE_CIRCULAR;    dac_config.sample_rate = TWR_DAC_SAMPLE_RATE_16K;    twr_dac_async_config(TWR_DAC_DAC0, &dac_config);    twr_dac_async_run(TWR_DAC_DAC0);}