Fawwaz Nadzmy
mbed library sources. Supersedes mbed-src.
Fork of
mbed-dev
by 
mbed official
Diff: targets/TARGET_NUVOTON/TARGET_NUC472/device/StdDriver/nuc472_i2s.c
- Revision:
- 149:156823d33999
- Parent:
- 144:ef7eb2e8f9f7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NUVOTON/TARGET_NUC472/device/StdDriver/nuc472_i2s.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,205 @@
+/******************************************************************************
+ * @file i2s.c
+ * @version V0.10
+ * $Revision: 14 $
+ * $Date: 14/09/30 1:10p $
+ * @brief NUC472/NUC442 I2S driver source file
+ *
+ * @note
+ * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
+*****************************************************************************/
+
+#include <stdio.h>
+#include "NUC472_442.h"
+
+/** @addtogroup NUC472_442_Device_Driver NUC472/NUC442 Device Driver
+ @{
+*/
+
+/** @addtogroup NUC472_442_I2S_Driver I2S Driver
+ @{
+*/
+
+/** @addtogroup NUC472_442_I2S_EXPORTED_FUNCTIONS I2S Exported Functions
+ @{
+*/
+
+/**
+ * @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
+ if((uint32_t)i2s == I2S0_BASE)
+ u32ClkSrcSel = CLK->CLKSEL3 & CLK_CLKSEL3_I2S0SEL_Msk;
+ else
+ u32ClkSrcSel = CLK->CLKSEL3 & CLK_CLKSEL3_I2S1SEL_Msk;
+
+ switch (u32ClkSrcSel) {
+ case CLK_CLKSEL3_I2S0SEL_HXT:
+ u32Freq = __HXT;
+ break;
+
+ case CLK_CLKSEL3_I2S0SEL_PLL:
+ case CLK_CLKSEL3_I2S1SEL_PLL:
+ u32Freq = CLK_GetPLLClockFreq();
+ break;
+
+ case CLK_CLKSEL3_I2S0SEL_HIRC:
+ case CLK_CLKSEL3_I2S1SEL_HIRC:
+ u32Freq = __HIRC;
+ break;
+
+ case CLK_CLKSEL3_I2S0SEL_PCLK:
+ case CLK_CLKSEL3_I2S1SEL_PCLK:
+ u32Freq = SystemCoreClock;
+ 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] u32Channels: Audio format. Valid values are:
+ * - \ref I2S_MONO
+ * - \ref I2S_STEREO
+ * @param[in] u32DataFormat: Data format. Valid values are:
+ * - \ref I2S_FORMAT_I2S
+ * - \ref I2S_FORMAT_MSB
+ * - \ref I2S_FORMAT_PCMA
+ * - \ref I2S_FORMAT_PCMB
+ * @param[in] u32AudioInterface: Audio interface. Valid values are:
+ * - \ref I2S_I2S
+ * - \ref I2S_PCM
+ * @return Real sample rate.
+ */
+uint32_t I2S_Open(I2S_T *i2s, uint32_t u32MasterSlave, uint32_t u32SampleRate, uint32_t u32WordWidth, uint32_t u32Channels, uint32_t u32DataFormat, uint32_t u32AudioInterface)
+{
+ uint16_t u16Divider;
+ uint32_t u32BitRate, u32SrcClk;
+
+ if((uint32_t)i2s == I2S0_BASE) {
+ SYS->IPRST1 |= SYS_IPRST1_I2S0RST_Msk;
+ SYS->IPRST1 &= ~SYS_IPRST1_I2S0RST_Msk;
+ } else {
+ SYS->IPRST1 |= SYS_IPRST1_I2S1RST_Msk;
+ SYS->IPRST1 &= ~SYS_IPRST1_I2S1RST_Msk;
+ }
+
+ i2s->CTL = u32MasterSlave | u32WordWidth | u32Channels | u32DataFormat | u32AudioInterface | I2S_FIFO_TX_LEVEL_WORD_4 | I2S_FIFO_RX_LEVEL_WORD_4;
+
+ u32SrcClk = I2S_GetSourceClockFreq(i2s);
+
+ u32BitRate = u32SampleRate * (((u32WordWidth>>4) & 0x3) + 1) * 16;
+ u16Divider = ((u32SrcClk/u32BitRate) >> 1) - 1;
+ i2s->CLKDIV = (i2s->CLKDIV & ~I2S_CLKDIV_BCLKDIV_Msk) | (u16Divider << 8);
+
+ //calculate real sample rate
+ u32BitRate = u32SrcClk / (2*(u16Divider+1));
+ u32SampleRate = u32BitRate / ((((u32WordWidth>>4) & 0x3) + 1) * 16);
+
+ i2s->CTL |= I2S_CTL_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->CTL &= ~I2S_CTL_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;
+
+ u32SrcClk = I2S_GetSourceClockFreq(i2s);
+ if (u32BusClock == u32SrcClk)
+ u8Divider = 0;
+ else
+ u8Divider = (u32SrcClk/u32BusClock) >> 1;
+
+ i2s->CLKDIV = (i2s->CLKDIV & ~I2S_CLKDIV_MCLKDIV_Msk) | u8Divider;
+
+ i2s->CTL |= I2S_CTL_MCLKEN_Msk;
+
+ u32Reg = i2s->CLKDIV & I2S_CLKDIV_MCLKDIV_Msk;
+
+ if (u32Reg == 0)
+ return u32SrcClk;
+ else
+ return ((u32SrcClk >> 1) / u32Reg);
+}
+
+/**
+ * @brief Disable MCLK .
+ * @param[in] i2s is the base address of I2S module.
+ * @return none
+ */
+void I2S_DisableMCLK(I2S_T *i2s)
+{
+ i2s->CTL &= ~I2S_CTL_MCLKEN_Msk;
+}
+/*@}*/ /* end of group NUC472_442_I2S_EXPORTED_FUNCTIONS */
+
+/*@}*/ /* end of group NUC472_442_I2S_Driver */
+
+/*@}*/ /* end of group NUC472_442_Device_Driver */
+
+/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/