Diff: targets/TARGET_NUVOTON/TARGET_NANO100/device/StdDriver/nano100_i2s.c

Revision:

174:b96e65c34a4d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NUVOTON/TARGET_NANO100/device/StdDriver/nano100_i2s.c	Mon Oct 02 15:33:19 2017 +0100
@@ -0,0 +1,204 @@
+/**************************************************************************//**
+ * @file     i2s.c
+ * @version  V1.00
+ * $Revision: 4 $
+ * $Date: 15/06/08 4:58p $
+ * @brief    Nano100 series I2S driver header file
+ *
+ * @note
+ * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
+ *****************************************************************************/
+
+#include <stdio.h>
+#include "Nano100Series.h"
+
+/** @addtogroup NANO100_Device_Driver NANO100 Device Driver
+  @{
+*/
+
+/** @addtogroup NANO100_I2S_Driver I2S Driver
+  @{
+*/
+
+/** @addtogroup NANO100_I2S_EXPORTED_FUNCTIONS I2S Exported Functions
+  @{
+*/
+
+/// @cond HIDDEN_SYMBOLS
+/**
+  * @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->CLKSEL2 & CLK_CLKSEL2_I2S_S_Msk;
+
+    switch (u32ClkSrcSel) {
+    case CLK_CLKSEL2_I2S_S_HXT:
+        u32Freq = __HXT;
+        break;
+
+    case CLK_CLKSEL2_I2S_S_PLL:
+        u32Freq = CLK_GetPLLClockFreq();
+        break;
+
+    case CLK_CLKSEL2_I2S_S_HIRC:
+        u32Freq = __HIRC;
+        break;
+
+    default:
+        u32Freq = __HIRC;
+        break;
+    }
+
+    return u32Freq;
+}
+/// @endcond /* HIDDEN_SYMBOLS */
+
+/**
+  * @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
+  * @param[in] u32AudioInterface: Audio interface. Valid values are:
+  *                                     - \ref I2S_I2S
+  * @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)
+{
+    uint8_t u8Divider;
+    uint32_t u32BitRate, u32SrcClk;
+
+    SYS->IPRST_CTL2 |= SYS_IPRST_CTL2_I2S_RST_Msk;
+    SYS->IPRST_CTL2 &= ~SYS_IPRST_CTL2_I2S_RST_Msk;
+
+    i2s->CTRL = 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;
+    u8Divider = ((u32SrcClk/u32BitRate) >> 1) - 1;
+    i2s->CLKDIV = (i2s->CLKDIV & ~I2S_CLKDIV_BCLK_DIV_Msk) | (u8Divider << 8);
+
+    //calculate real sample rate
+    u32BitRate = u32SrcClk / (2*(u8Divider+1));
+    u32SampleRate = u32BitRate / ((((u32WordWidth>>4) & 0x3) + 1) * 16);
+
+    i2s->CTRL |= I2S_CTRL_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->CTRL &= ~I2S_CTRL_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->INTEN |= 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->INTEN &= ~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_MCLK_DIV_Msk) | u8Divider;
+
+    i2s->CTRL |= I2S_CTRL_MCLKEN_Msk;
+
+    u32Reg = i2s->CLKDIV & I2S_CLKDIV_MCLK_DIV_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->CTRL &= ~I2S_CTRL_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->CTRL = (i2s->CTRL & ~(I2S_CTRL_TXTH_Msk | I2S_CTRL_RXTH_Msk) |
+                 (u32TxThreshold << I2S_CTRL_TXTH_Pos) |
+                 (u32RxThreshold << I2S_CTRL_RXTH_Pos));
+}
+/*@}*/ /* end of group NANO100_I2S_EXPORTED_FUNCTIONS */
+
+/*@}*/ /* end of group NANO100_I2S_Driver */
+
+/*@}*/ /* end of group NANO100_Device_Driver */
+
+/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/