/********************************************************************//**
* @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;
}
}
