NRF9160-SICA-R7 datasheet(127/400 Pages) NORDIC

127 / 400 page

Peripherals

2. Map IO pins using the PINSEL registers

// MCK routed to pin 0

NRF_I2S->PSEL.MCK = (0 << I2S_PSEL_MCK_PIN_Pos) |

(I2S_PSEL_MCK_CONNECT_Connected <<

I2S_PSEL_MCK_CONNECT_Pos);

// SCK routed to pin 1

NRF_I2S->PSEL.SCK = (1 << I2S_PSEL_SCK_PIN_Pos) |

(I2S_PSEL_SCK_CONNECT_Connected <<

I2S_PSEL_SCK_CONNECT_Pos);

// LRCK routed to pin 2

NRF_I2S->PSEL.LRCK = (2 << I2S_PSEL_LRCK_PIN_Pos) |

(I2S_PSEL_LRCK_CONNECT_Connected <<

I2S_PSEL_LRCK_CONNECT_Pos);

// SDOUT routed to pin 3

NRF_I2S->PSEL.SDOUT = (3 << I2S_PSEL_SDOUT_PIN_Pos) |

(I2S_PSEL_SDOUT_CONNECT_Connected <<

I2S_PSEL_SDOUT_CONNECT_Pos);

// SDIN routed on pin 4

NRF_I2S->PSEL.SDIN = (4 << I2S_PSEL_SDIN_PIN_Pos) |

(I2S_PSEL_SDIN_CONNECT_Connected <<

I2S_PSEL_SDIN_CONNECT_Pos);

3. Configure TX and RX data pointers using the TXD, RXD and RXTXD registers

NRF_I2S->TXD.PTR = my_tx_buf;

NRF_I2S->RXD.PTR = my_rx_buf;

NRF_I2S->TXD.MAXCNT = MY_BUF_SIZE;

4. Enable the I2S module using the ENABLE register

NRF_I2S->ENABLE = 1;

5. Start audio streaming using the START task

NRF_I2S->TASKS_START = 1;

6. Handle received and transmitted data when receiving the TXPTRUPD and RXPTRUPD events

if(NRF_I2S->EVENTS_TXPTRUPD != 0)

{

NRF_I2S->TXD.PTR = my_next_tx_buf;

NRF_I2S->EVENTS_TXPTRUPD = 0;

}

if(NRF_I2S->EVENTS_RXPTRUPD != 0)

{

NRF_I2S->RXD.PTR = my_next_rx_buf;

NRF_I2S->EVENTS_RXPTRUPD = 0;

}

4418_1315 v2.0

127

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