NRF9160-SICA-R7 datasheet(126/400 Pages) NORDIC

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Peripherals

Left sample 0

x.PTR

x.PTR + 4

x.PTR + (n*4) - 4

Left sample 1

Sign ext.

Left sample n - 1

Sign ext.

Figure 33: Memory mapping for 24 bit mono, left channel

only. CONFIG.SWIDTH = 24Bit, CONFIG.CHANNELS = Left.

6.7.8 Module operation

Described here is a typical operating procedure for the I2S module.

1. Configure the I2S module using the CONFIG registers

// Enable reception

NRF_I2S->CONFIG.RXEN = (I2S_CONFIG_RXEN_RXEN_Enabled <<

I2S_CONFIG_RXEN_RXEN_Pos);

// Enable transmission

NRF_I2S->CONFIG.TXEN = (I2S_CONFIG_TXEN_TXEN_Enabled <<

I2S_CONFIG_TXEN_TXEN_Pos);

// Enable MCK generator

NRF_I2S->CONFIG.MCKEN = (I2S_CONFIG_MCKEN_MCKEN_Enabled <<

I2S_CONFIG_MCKEN_MCKEN_Pos);

// MCKFREQ = 4 MHz

NRF_I2S->CONFIG.MCKFREQ = I2S_CONFIG_MCKFREQ_MCKFREQ_32MDIV8 <<

I2S_CONFIG_MCKFREQ_MCKFREQ_Pos;

// Ratio = 256

NRF_I2S->CONFIG.RATIO = I2S_CONFIG_RATIO_RATIO_256X <<

I2S_CONFIG_RATIO_RATIO_Pos;

// MCKFREQ = 4 MHz and Ratio = 256 gives sample rate = 15.625 ks/s

// Sample width = 16 bit

NRF_I2S->CONFIG.SWIDTH = I2S_CONFIG_SWIDTH_SWIDTH_16Bit <<

I2S_CONFIG_SWIDTH_SWIDTH_Pos;

// Alignment = Left

NRF_I2S->CONFIG.ALIGN = I2S_CONFIG_ALIGN_ALIGN_Left <<

I2S_CONFIG_ALIGN_ALIGN_Pos;

// Format = I2S

NRF_I2S->CONFIG.FORMAT = I2S_CONFIG_FORMAT_FORMAT_I2S <<

I2S_CONFIG_FORMAT_FORMAT_Pos;

// Use stereo

NRF_I2S->CONFIG.CHANNELS = I2S_CONFIG_CHANNELS_CHANNELS_Stereo <<

I2S_CONFIG_CHANNELS_CHANNELS_Pos;

4418_1315 v2.0

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