Diff: I2SSlave/I2SSlave.cpp

Revision:

1:9ea0cc2fa567

Parent:

0:3d6892f6384f

--- a/I2SSlave/I2SSlave.cpp	Fri Aug 05 10:07:47 2011 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,306 +0,0 @@
-/******************************************************
- * I2SSlave.cpp: I2S port abstraction library cpp file for NXP LPC1768
- *
- * Written by:
- * mbed Team     -   15th July 2011
- * Daniel Worrall
- *
- * History
- * version 1.31
-******************************************************/
-#include "I2SSlave.h"
-/*Global Functions*/
-FunctionPointer akjnh3489v8ncv;
-
-extern "C" void I2S_IRQHandler(void){                   //this is a very special function so can remain outside
-    akjnh3489v8ncv.call();
-}
-/******************************************************
- * Function name:   I2SSlave
- *
- * Description:     class constructor
- *
- * Parameters:      PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
- * Returns:         none
-******************************************************/
-//Constructor
-I2SSlave::I2SSlave(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
-    storePins_(tx_sda, tx_ws, clk, rx_sda, rx_ws);
-    format(16, STEREO);                                 //this also invokes initialize so no need to call it twice
-}
-//Public functions
-/******************************************************
- * Function name:   format()
- *
- * Description:     sets the bit length for writing and stereo or mono mode
- *
- * Parameters:      int bit, bool mode
- * Returns:         none
-******************************************************/
-void I2SSlave::format(int bit, bool mode){
-    bit_ = bit;
-    mode_ = mode;
-    initialize_(tx_sda_, tx_ws_, clk_, rx_sda_, rx_ws_);
-}
-/******************************************************
- * Function name:   write()
- *
- * Description:     load buffer to write to I2S port
- *
- * Parameters:      long *buffer
- * Returns:         none
-******************************************************/
-void I2SSlave::write(int* buffer, int from, int length){
-    int to = from + length;
-    for(int i = from; i < to; ++i){
-        LPC_I2S->I2STXFIFO = buffer[i];
-    }
-}
-/******************************************************
- * Function name:   start()
- *
- * Description:     attach streamOut_ function to ticker interrupt
- *
- * Parameters:      none
- * Returns:         none
-******************************************************/
-void I2SSlave::start(int mode){
-    switch(mode){
-        case(0):
-             LPC_I2S->I2SIRQ |= (0 << 0);           //disable receive interrupt
-             LPC_I2S->I2SIRQ |= (0 << 1);           //disable transmit interrupt
-             break;
-        case(1):
-            LPC_I2S->I2SIRQ |= (0 << 0);            //disable receive interrupt
-            LPC_I2S->I2SIRQ |= (1 << 1);            //enable transmit interrupt
-            LPC_I2S->I2SIRQ |= (0 << 16);           //set I2STXFIFO depth to 0 words
-            break;
-        case(2):
-            LPC_I2S->I2SIRQ |= (1 << 0);            //enable receive interrupt
-            LPC_I2S->I2SIRQ |= (0 << 1);            //disable transmit interrupt
-            LPC_I2S->I2SIRQ |= (4 << 8);            //set I2SRXFIFO depth to 4 words
-            break;
-        case(3):
-            LPC_I2S->I2SIRQ |= (1 << 0);            //enable receive interrupt
-            LPC_I2S->I2SIRQ |= (4 << 8);            //set I2SRXFIFO depth to 4 words
-            LPC_I2S->I2SIRQ |= (1 << 1);            //enable transmit interrupt
-            LPC_I2S->I2SIRQ |= (0 << 16);           //set I2STXFIFO depth to 0 words
-            break;
-        default:
-            break;
-    }
-    NVIC_SetPriority(I2S_IRQn, 0);
-    NVIC_EnableIRQ(I2S_IRQn);                       //enable I2S interrupt in the NVIC 
-}
-/******************************************************
- * Function name:   stop()
- *
- * Description:     detach streamOut_ from ticker
- *
- * Parameters:      none
- * Returns:         none
-******************************************************/
-void I2SSlave::stop(void){
-    NVIC_DisableIRQ(I2S_IRQn);           
-}
-/******************************************************
- * Function name:   read()
- *
- * Description:     reads FIFORX buffer into [int32_t rxBuffer[8]]
- *
- * Parameters:      none
- * Returns:         none
-******************************************************/
-void I2SSlave::read(void){
-    rxBuffer[0] = LPC_I2S->I2SRXFIFO;
-    rxBuffer[1] = LPC_I2S->I2SRXFIFO;
-    rxBuffer[2] = LPC_I2S->I2SRXFIFO;
-    rxBuffer[3] = LPC_I2S->I2SRXFIFO;
-}
-/******************************************************
- * Function name:   status_()
- *
- * Description:     Read I2SSTATE register
- *
- * Parameters:      none
- * Returns:         int
-******************************************************/
-int I2SSlave::status(void){
-    return LPC_I2S->I2SSTATE;
-}
-//Private functions
-/******************************************************
- * Function name:   initialize()
- *
- * Description:     initialises I2S port 
- *
- * Parameters:      PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
- * Returns:         0 =  successful initialisation
-                   -1 = initialisation failure
-******************************************************/
-int I2SSlave::initialize_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
-    setPins_(tx_sda, tx_ws, clk, rx_sda, rx_ws);        //designate pins
-    LPC_SC->PCONP |= (1 << 27);
-    //configure input/output register
-    format_(bit_, mode_);           
-    //set mbed as SLAVE  
-    LPC_I2S->I2SDAO |= (1 << 5);
-    LPC_I2S->I2SDAI |= (1 << 5);
-    //clock mode
-    setClocks_(4);
-    //set slave mode
-    modeConfig_();
-    //set receiver mode
-    LPC_I2S->I2SRXMODE |= (1 << 1);
-    //slave mode
-    LPC_I2S->I2STXRATE = 0;
-    LPC_I2S->I2SRXRATE = 0;
-    //Start
-    LPC_I2S->I2SDAO |= (0 << 3);          
-    LPC_I2S->I2SDAI |= (0 << 3);
-    LPC_I2S->I2SDAO |= (0 << 4);          
-    LPC_I2S->I2SDAI |= (0 << 4);
-    LPC_I2S->I2SDAO |= (0 << 15);          
-    return 0;
-}
-/******************************************************
- * Function name:   setClocks_()
- *
- * Description:     Set the division setting on the internal clocks
- *
- * Parameters:      int divideBy
- * Returns:         nothing
-******************************************************/
-void I2SSlave::setClocks_(int divideBy){
-    switch(divideBy){
-        case 1:
-            LPC_SC->PCLKSEL1 |= (1 << 22); 
-            LPC_SC->PCLKSEL1 |= (0 << 23);     
-            break;
-        case 2:
-            LPC_SC->PCLKSEL1 |= (0 << 22);
-            LPC_SC->PCLKSEL1 |= (1 << 23);
-            break;
-        case 4:
-            LPC_SC->PCLKSEL1 |= (0 << 22);
-            LPC_SC->PCLKSEL1 |= (0 << 23);
-            break;
-        case 8:
-            LPC_SC->PCLKSEL1 |= (1 << 22);
-            LPC_SC->PCLKSEL1 |= (1 << 23);
-            break;
-        default:
-            break;
-    }
-}
-/******************************************************
- * Function name:   setPins_()
- *
- * Description:     set external pin configuration
- *
- * Parameters:      PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
- * Returns:         none
-******************************************************/
-void I2SSlave::setPins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
-    if(rx_ws == p29){
-        LPC_PINCON->PINSEL0 |= (1 << 10);   //set p29 as receive word select line
-    } else {
-        LPC_PINCON->PINSEL1 |= (2 << 16);   //set p16 as receive word select line
-    }
-    if(rx_sda == p8){
-        LPC_PINCON->PINSEL0 |= (1 << 12);   //set p8 as receive serial data line
-    } else {
-        LPC_PINCON->PINSEL1 |= (2 << 18);   //set p17 as receive serial data line
-    }
-    LPC_PINCON->PINSEL0 |= (1 << 14);       //set p7 as transmit clock line (only one of these)    
-    LPC_PINCON->PINSEL0 |= (1 << 16);       //set p6 as word select line (only one of these)   
-    LPC_PINCON->PINSEL0 |= (1 << 18);       //set p5 as transmit serial data line (only one of these)
-    LPC_PINCON->PINSEL0 |= (0 << 8);        //clear rx_clk
-}
-/******************************************************
- * Function name:   format_()
- *
- * Description:     sets the bit length for writing and stereo or mono mode
- *
- * Parameters:      int bit, bool mode
- * Returns:         none
-******************************************************/
-void I2SSlave::format_(int bit, bool mode){
-    uint32_t bps= ((bit+1)*8)-1;
-    LPC_I2S->I2SDAO &= (0x00 << 6);
-    LPC_I2S->I2SDAO |= (bps << 6);
-    //set bit length
-    switch(bit){
-        case 8:
-            LPC_I2S->I2SDAO &= 0xfffffffc;
-            break;
-        case 16:
-            LPC_I2S->I2SDAO &= (0 << 1);
-            LPC_I2S->I2SDAO |= (1 << 0);           
-            break;
-        case 32:
-            LPC_I2S->I2SDAO &= (0 << 1);
-            LPC_I2S->I2SDAO |= (3 << 0);
-            break;
-        default:
-            break;
-    }
-    //set audio mode
-    if(mode == STEREO){
-        LPC_I2S->I2SDAO |= (0 << 2);
-    } else {
-        LPC_I2S->I2SDAO |= (1 << 2);
-    }
-    //set transmitter and receiver setting to be the same
-    LPC_I2S->I2SDAI &= (0x00 << 6);
-    LPC_I2S->I2SDAI |= (bps << 6);
-    //set bit length
-    switch(bit){
-        case 8:
-            LPC_I2S->I2SDAI &= 0xfffffffc;
-            break;
-        case 16:
-            LPC_I2S->I2SDAI &= (0 << 1);
-            LPC_I2S->I2SDAI |= (1 << 0);
-            break;
-        case 32:
-            LPC_I2S->I2SDAI &= (0 << 1);
-            LPC_I2S->I2SDAI |= (3 << 0);
-            break;
-        default:
-            break;
-    }
-    //set audio mode
-    if(mode == STEREO){
-        LPC_I2S->I2SDAI |= (0 << 2);
-    } else {
-        LPC_I2S->I2SDAI |= (1 << 2);
-    }
-}
-/******************************************************
- * Function name:   modeConfig_()
- *
- * Description:     Set slave mode
- *
- * Parameters:      none
- * Returns:         none
-******************************************************/
-void I2SSlave::modeConfig_(void){
-    LPC_I2S->I2STXMODE |= (0x0 << 0);
-    LPC_I2S->I2SRXMODE |= (0x0 << 0);
-}
-/******************************************************
- * Function name:   storePins_()
- *
- * Description:     set external pin configuration
- *
- * Parameters:      PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws
- * Returns:         none
-******************************************************/
-void I2SSlave::storePins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws){
-    tx_sda_ = tx_sda;
-    tx_ws_ = tx_ws;
-    clk_ = clk;
-    rx_sda_ = rx_sda;
-    rx_ws_ = rx_ws;
-}
\ No newline at end of file