/********************************************************************//**
* @brief Configuration I2S, setting:
* - master/slave mode
* - wordwidth value
* - channel mode
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S0 or LPC_I2S1
* @param[in] TRMode transmit/receive mode, should be:
* - I2S_TX_MODE = 0 :transmit mode
* - I2S_RX_MODE = 1 :receive mode
* @param[in] ConfigStruct pointer to I2S_CFG_Type structure
* which will be initialized.
* @return none
*********************************************************************/
void I2S_Config(LPC_I2Sn_Type *I2Sx, uint8_t TRMode, I2S_CFG_Type* ConfigStruct)
{
uint32_t bps, config;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_WORDWIDTH(ConfigStruct->wordwidth));
CHECK_PARAM(PARAM_I2S_CHANNEL(ConfigStruct->mono));
CHECK_PARAM(PARAM_I2S_STOP(ConfigStruct->stop));
CHECK_PARAM(PARAM_I2S_RESET(ConfigStruct->reset));
CHECK_PARAM(PARAM_I2S_WS_SEL(ConfigStruct->ws_sel));
CHECK_PARAM(PARAM_I2S_MUTE(ConfigStruct->mute));
/* Setup clock */
bps = (ConfigStruct->wordwidth +1)*8;
/* Calculate audio config */
config = (bps - 1)<<6 | (ConfigStruct->ws_sel)<<5 | (ConfigStruct->reset)<<4 |
(ConfigStruct->stop)<<3 | (ConfigStruct->mono)<<2 | (ConfigStruct->wordwidth);
if(TRMode == I2S_RX_MODE){
I2Sx->DAI = config;
}else{
I2Sx->DAO = config;
}
}
/********************************************************************//**
* @brief Initialize I2S
* - Turn on power and clock
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S0 or LPC_I2S1
* @return none
*********************************************************************/
void I2S_Init(LPC_I2Sn_Type *I2Sx) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
// Turn on power and clock
//CGU_ConfigPPWR(CGU_PCONP_PCI2S, ENABLE);
I2Sx->DAI = I2Sx->DAO = 0x00;
}
/********************************************************************//**
* @brief Get I2S channel value
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
* @param[in] TRMode is the I2S mode, should be:
* - I2S_TX_MODE = 0: transmit mode
* - I2S_RX_MODE = 1: receive mode
* @return The channel value, should be: 1(mono) or 2(stereo)
*********************************************************************/
static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
uint8_t value;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) {
value = ((I2Sx->I2SDAO) & 0x04)>>2; /* get bit[2] */
} else {
/********************************************************************//**
* @brief Get I2S Buffer Level
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S0 or LPC_I2S1
* @param[in] TRMode Transmit/receive mode, should be:
* - I2S_TX_MODE = 0 :transmit mode
* - I2S_RX_MODE = 1 :receive mode
* @return current level of Transmit/Receive Buffer
*********************************************************************/
uint8_t I2S_GetLevel(LPC_I2Sn_Type *I2Sx, uint8_t TRMode)
{
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if(TRMode == I2S_TX_MODE)
{
return ((I2Sx->STATE >> 16) & 0xFF);
}
else
{
return ((I2Sx->STATE >> 8) & 0xFF);
/********************************************************************//**
* @brief Get I2S channel value
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S0 or LPC_I2S1
* @param[in] TRMode is the I2S mode, should be:
* - I2S_TX_MODE = 0 :transmit mode
* - I2S_RX_MODE = 1 :receive mode
* @return The channel value, should be: 1(mono) or 2(stereo)
*********************************************************************/
static uint8_t i2s_GetChannel(LPC_I2Sn_Type *I2Sx, uint8_t TRMode) {
uint8_t value;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) {
value = (I2Sx->DAO) & 0x04; /* get bit[2] */
} else {
value = (I2Sx->DAI) & 0x04; /* get bit[2] */
}
value >>= 2;
if(value == I2S_MONO) return 1;
return 2;
}
/********************************************************************//**
* @brief Get I2S wordwidth value
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S
* @param[in] TRMode is the I2S mode, should be:
* - I2S_TX_MODE = 0: transmit mode
* - I2S_RX_MODE = 1: receive mode
* @return The wordwidth value, should be: 8,16 or 32
*********************************************************************/
static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
uint8_t value;
CHECK_PARAM(PARAM_I2Sx(I2Sx));
CHECK_PARAM(PARAM_I2S_TRX(TRMode));
if (TRMode == I2S_TX_MODE) {
value = (I2Sx->I2SDAO) & 0x03; /* get wordwidth bit */
} else {
value = (I2Sx->I2SDAI) & 0x03; /* get wordwidth bit */
}
switch (value) {
case I2S_WORDWIDTH_8:
return 8;
case I2S_WORDWIDTH_16:
return 16;
default:
return 32;
}
}
/********************************************************************//**
* @brief DeInitial both I2S transmit or receive
* @param[in] I2Sx I2S peripheral selected, should be: LPC_I2S0 or LPC_I2S1
* @return none
*********************************************************************/
void I2S_DeInit(LPC_I2Sn_Type *I2Sx) {
CHECK_PARAM(PARAM_I2Sx(I2Sx));
// Turn off power and clock
//CGU_ConfigPPWR(CGU_PCONP_PCI2S, DISABLE);
}
