/**************************************************************************//** * @file i2s.c * @version V0.10 * @brief M480 I2S driver source file * * SPDX-License-Identifier: Apache-2.0 * @copyright (C) 2016-2020 Nuvoton Technology Corp. All rights reserved. *****************************************************************************/ #include #include "NuMicro.h" /** @addtogroup Standard_Driver Standard Driver @{ */ /** @addtogroup I2S_Driver I2S Driver @{ */ /** @addtogroup I2S_EXPORTED_FUNCTIONS I2S Exported Functions @{ */ static uint32_t I2S_GetSourceClockFreq(I2S_T *i2s); /** * @brief This function is used to get I2S source clock frequency. * @param[in] i2s is the base address of I2S module. * @return I2S source clock frequency (Hz). */ static uint32_t I2S_GetSourceClockFreq(I2S_T *i2s) { uint32_t u32Freq, u32ClkSrcSel; /* get I2S selection clock source */ u32ClkSrcSel = CLK->CLKSEL3 & CLK_CLKSEL3_I2S0SEL_Msk; switch (u32ClkSrcSel) { case CLK_CLKSEL3_I2S0SEL_HXT: u32Freq = __HXT; break; case CLK_CLKSEL3_I2S0SEL_PLL: u32Freq = CLK_GetPLLClockFreq(); break; case CLK_CLKSEL3_I2S0SEL_HIRC: u32Freq = __HIRC; break; case CLK_CLKSEL3_I2S0SEL_PCLK0: u32Freq = (uint32_t)CLK_GetPCLK0Freq(); break; default: u32Freq = __HIRC; break; } return u32Freq; } /** * @brief This function configures some parameters of I2S interface for general purpose use. * The sample rate may not be used from the parameter, it depends on system's clock settings, * but real sample rate used by system will be returned for reference. * @param[in] i2s is the base address of I2S module. * @param[in] u32MasterSlave I2S operation mode. Valid values are: * - \ref I2S_MODE_MASTER * - \ref I2S_MODE_SLAVE * @param[in] u32SampleRate Sample rate * @param[in] u32WordWidth Data length. Valid values are: * - \ref I2S_DATABIT_8 * - \ref I2S_DATABIT_16 * - \ref I2S_DATABIT_24 * - \ref I2S_DATABIT_32 * @param[in] u32MonoData: Set audio data to mono or not. Valid values are: * - \ref I2S_ENABLE_MONO * - \ref I2S_DISABLE_MONO * @param[in] u32DataFormat: Data format. This is also used to select I2S or PCM(TDM) function. Valid values are: * - \ref I2S_FORMAT_I2S * - \ref I2S_FORMAT_I2S_MSB * - \ref I2S_FORMAT_I2S_LSB * - \ref I2S_FORMAT_PCM * - \ref I2S_FORMAT_PCM_MSB * - \ref I2S_FORMAT_PCM_LSB * @return Real sample rate. */ uint32_t I2S_Open(I2S_T *i2s, uint32_t u32MasterSlave, uint32_t u32SampleRate, uint32_t u32WordWidth, uint32_t u32MonoData, uint32_t u32DataFormat) { uint16_t u16Divider; uint32_t u32BitRate, u32SrcClk; SYS->IPRST1 |= SYS_IPRST1_I2S0RST_Msk; SYS->IPRST1 &= ~SYS_IPRST1_I2S0RST_Msk; i2s->CTL0 = u32MasterSlave | u32WordWidth | u32MonoData | u32DataFormat; i2s->CTL1 = I2S_FIFO_TX_LEVEL_WORD_8 | I2S_FIFO_RX_LEVEL_WORD_8; u32SrcClk = I2S_GetSourceClockFreq(i2s); u32BitRate = u32SampleRate * (((u32WordWidth>>4U) & 0x3U) + 1U) * 16U; //u16Divider = (uint16_t)((u32SrcClk/u32BitRate) >> 1U) - 1U; u16Divider = (uint16_t)((((u32SrcClk * 10UL / u32BitRate) >> 1U) + 5UL) / 10UL) - 1U; i2s->CLKDIV = (i2s->CLKDIV & ~I2S_CLKDIV_BCLKDIV_Msk) | ((uint32_t)u16Divider << 8U); /* calculate real sample rate */ u32BitRate = u32SrcClk / (2U*((uint32_t)u16Divider+1U)); u32SampleRate = u32BitRate / ((((u32WordWidth>>4U) & 0x3U) + 1U) * 16U); i2s->CTL0 |= I2S_CTL0_I2SEN_Msk; return u32SampleRate; } /** * @brief Disable I2S function and I2S clock. * @param[in] i2s is the base address of I2S module. * @return none */ void I2S_Close(I2S_T *i2s) { i2s->CTL0 &= ~I2S_CTL0_I2SEN_Msk; } /** * @brief This function enables the interrupt according to the mask parameter. * @param[in] i2s is the base address of I2S module. * @param[in] u32Mask is the combination of all related interrupt enable bits. * Each bit corresponds to a interrupt bit. * @return none */ void I2S_EnableInt(I2S_T *i2s, uint32_t u32Mask) { i2s->IEN |= u32Mask; } /** * @brief This function disables the interrupt according to the mask parameter. * @param[in] i2s is the base address of I2S module. * @param[in] u32Mask is the combination of all related interrupt enable bits. * Each bit corresponds to a interrupt bit. * @return none */ void I2S_DisableInt(I2S_T *i2s, uint32_t u32Mask) { i2s->IEN &= ~u32Mask; } /** * @brief Enable MCLK . * @param[in] i2s is the base address of I2S module. * @param[in] u32BusClock is the target MCLK clock * @return Actual MCLK clock */ uint32_t I2S_EnableMCLK(I2S_T *i2s, uint32_t u32BusClock) { uint8_t u8Divider; uint32_t u32SrcClk, u32Reg, u32Clock; u32SrcClk = I2S_GetSourceClockFreq(i2s); if (u32BusClock == u32SrcClk) { u8Divider = 0U; } else { u8Divider = (uint8_t)(u32SrcClk/u32BusClock) >> 1U; } i2s->CLKDIV = (i2s->CLKDIV & ~I2S_CLKDIV_MCLKDIV_Msk) | u8Divider; i2s->CTL0 |= I2S_CTL0_MCLKEN_Msk; u32Reg = i2s->CLKDIV & I2S_CLKDIV_MCLKDIV_Msk; if (u32Reg == 0U) { u32Clock = u32SrcClk; } else { u32Clock = ((u32SrcClk >> 1U) / u32Reg); } return u32Clock; } /** * @brief Disable MCLK . * @param[in] i2s is the base address of I2S module. * @return none */ void I2S_DisableMCLK(I2S_T *i2s) { i2s->CTL0 &= ~I2S_CTL0_MCLKEN_Msk; } /** * @brief Configure FIFO threshold setting. * @param[in] i2s The pointer of the specified I2S module. * @param[in] u32TxThreshold Decides the TX FIFO threshold. It could be 0 ~ 7. * @param[in] u32RxThreshold Decides the RX FIFO threshold. It could be 0 ~ 7. * @return None * @details Set TX FIFO threshold and RX FIFO threshold configurations. */ void I2S_SetFIFO(I2S_T *i2s, uint32_t u32TxThreshold, uint32_t u32RxThreshold) { i2s->CTL1 = ((i2s->CTL1 & ~(I2S_CTL1_TXTH_Msk | I2S_CTL1_RXTH_Msk)) | (u32TxThreshold << I2S_CTL1_TXTH_Pos) | (u32RxThreshold << I2S_CTL1_RXTH_Pos)); } /** * @brief Configure PCM(TDM) function parameters, such as channel width, channel number and sync pulse width * @param[in] i2s The pointer of the specified I2S module. * @param[in] u32ChannelWidth Channel width. Valid values are: * - \ref I2S_TDM_WIDTH_8BIT * - \ref I2S_TDM_WIDTH_16BIT * - \ref I2S_TDM_WIDTH_24BIT * - \ref I2S_TDM_WIDTH_32BIT * @param[in] u32ChannelNum Channel number. Valid values are: * - \ref I2S_TDM_2CH * - \ref I2S_TDM_4CH * - \ref I2S_TDM_6CH * - \ref I2S_TDM_8CH * @param[in] u32SyncWidth Width for sync pulse. Valid values are: * - \ref I2S_TDM_SYNC_ONE_BCLK * - \ref I2S_TDM_SYNC_ONE_CHANNEL * @return None * @details Set TX FIFO threshold and RX FIFO threshold configurations. */ void I2S_ConfigureTDM(I2S_T *i2s, uint32_t u32ChannelWidth, uint32_t u32ChannelNum, uint32_t u32SyncWidth) { i2s->CTL0 = ((i2s->CTL0 & ~(I2S_CTL0_TDMCHNUM_Msk | I2S_CTL0_CHWIDTH_Msk | I2S_CTL0_PCMSYNC_Msk)) | (u32ChannelWidth << I2S_CTL0_CHWIDTH_Pos) | (u32ChannelNum << I2S_CTL0_TDMCHNUM_Pos) | (u32SyncWidth << I2S_CTL0_PCMSYNC_Pos)); } /*@}*/ /* end of group I2S_EXPORTED_FUNCTIONS */ /*@}*/ /* end of group I2S_Driver */ /*@}*/ /* end of group Standard_Driver */ /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/