/** mbed Microcontroller Library
  ******************************************************************************
  * @file    i2s_api.c
  * @author 
  * @version V1.0.0
  * @date    2016-08-01
  * @brief   This file provides mbed API for I2S.
  ******************************************************************************
  * @attention
  *
  * This module is a confidential and proprietary property of RealTek and
  * possession or use of this module requires written permission of RealTek.
  *
  * Copyright(c) 2016, Realtek Semiconductor Corporation. All rights reserved.
  ****************************************************************************** 
  */
#include "objects.h"
#include "i2s_api.h"
#include "pinmap.h"

typedef struct {
	VOID (*TxCCB)(uint32_t id, char *pbuf);
	u32 TxCBId;
	VOID (*RxCCB)(uint32_t id, char *pbuf);
	u32 RxCBId;
} I2S_USER_CB;

static I2S_InitTypeDef I2SInitStruct;
static I2S_USER_CB I2SUserCB; //Pointer to I2S User Callback
static u32 next_tx_complete = 0;
extern u32 i2s_cur_tx_page;
extern u32 i2s_cur_rx_page;

static void i2s_sw_reset(void)
{
	i2s_cur_tx_page = 0;
	i2s_cur_rx_page = 0;
	next_tx_complete = 0;
}

static void i2s_isr(void *Data)
{
	u32 I2STxIsr, I2SRxIsr;
	u8  I2SPageNum = I2SInitStruct.I2S_PageNum;
	u32 i;
	u32 pbuf;
	u32 cur_tx_page = 0;
	u32 cur_rx_page = 0;

	I2S_ISRGet(I2S_DEV, &I2STxIsr, &I2SRxIsr);
	I2S_INTClear(I2S_DEV, I2STxIsr, I2SRxIsr);

	for (i=0 ; i<I2SPageNum; i++) { // page 0, 1, 2, 3
		cur_rx_page = I2S_GetRxPage(I2S_DEV);
		if (I2SRxIsr & (1<<cur_rx_page)) {
			pbuf = I2S_GetRxPageAddr(cur_rx_page);
			I2SRxIsr &= ~(1<<cur_rx_page);

			I2SUserCB.RxCCB(I2SUserCB.RxCBId, (char*)pbuf);
		} else {
			break;
		}
	}
	
	for (i=0 ; i<I2SPageNum; i++) { // page 0, 1, 2, 3		
		if (I2STxIsr & (1<<next_tx_complete)) {
			pbuf = I2S_GetTxPageAddr(next_tx_complete);
			I2STxIsr &= ~(1<<next_tx_complete);

			next_tx_complete++;
			next_tx_complete &= 0x03;

			I2SUserCB.TxCCB(I2SUserCB.TxCBId, (char*)pbuf);
		} else {
			break;
		}


	}
}

/**
  * @brief  Initializes the I2S device, include clock/function/interrupt/I2S registers.
  * @param  obj: i2s object define in application software.
  * @param  sck: Serial clock PinName according to pinmux spec.
  * @param  ws: Word select PinName according to pinmux spec.
  * @param  sd_tx: Tx PinName according to pinmux spec.
  * @param  sd_rx: Rx PinName according to pinmux spec.
  * @param  mck: Master clock PinName according to pinmux spec.
  * @retval none
  */
void i2s_init(i2s_t *obj, PinName sck, PinName ws, PinName sd_tx, PinName sd_rx, PinName mck)
{
	obj->i2s_idx = 0;

	DBG_PRINTF(MODULE_I2S, LEVEL_INFO, "%s: Use I2S%d \n", __func__, obj->i2s_idx);

	// Load user defined parameters
	I2S_StructInit(&I2SInitStruct);

	/*I2S Interrupt Initialization*/
	InterruptRegister((IRQ_FUN) i2s_isr, I2S0_PCM0_IRQ, NULL, 3);
	InterruptEn(I2S0_PCM0_IRQ, 3);

	/* enable system pll */
	PLL1_Set(BIT_SYS_SYSPLL_CK22P5792_EN | BIT_SYS_SYSPLL_CK24P576_EN, ENABLE);
	
	/* enable lx bus for i2s */
	LXBUS_FCTRL(ON);

	/*I2S Pin Mux Initialization*/
	RCC_PeriphClockCmd(APBPeriph_I2S0, APBPeriph_I2S0_CLOCK, ENABLE);
	Pinmux_Config(sck, PINMUX_FUNCTION_I2S);
	Pinmux_Config(ws, PINMUX_FUNCTION_I2S);
	Pinmux_Config(sd_tx, PINMUX_FUNCTION_I2S);
	Pinmux_Config(sd_rx, PINMUX_FUNCTION_I2S);
	Pinmux_Config(mck, PINMUX_FUNCTION_I2S);

	next_tx_complete = 0;
	I2SInitStruct.I2S_TRxAct = obj->direction;
	I2SInitStruct.I2S_ChNum = obj->channel_num;
	I2SInitStruct.I2S_Rate = obj->sampling_rate;
	I2SInitStruct.I2S_WordLen = obj->word_length;
	/*I2S HAL Initialization*/
	I2S_Init(I2S_DEV, &I2SInitStruct);

	/*I2S Enable Module*/
	I2S_Cmd(I2S_DEV, ENABLE);
	I2S_INTConfig(I2S_DEV, (I2S_TX_INT_PAGE0_OK|I2S_TX_INT_PAGE1_OK| I2S_TX_INT_PAGE2_OK|I2S_TX_INT_PAGE3_OK),
		(I2S_RX_INT_PAGE0_OK|I2S_RX_INT_PAGE1_OK | I2S_RX_INT_PAGE2_OK|I2S_RX_INT_PAGE3_OK));
}

/**
  * @brief  Sets page number, page size, page address.
  * @param  obj: i2s object define in application software.
  * @param  tx_buf: pointer to the start address of Tx page.
  * @param  rx_buf: pointer to the start address of Rx page.
  * @param  page_num: page number. This parameter must be set to a value in the 2~4 range
  * @param  page_size: page size. This parameter must be set to a value in the 4~16384 bytes range
  * @retval none
  */
void i2s_set_dma_buffer(i2s_t *obj, char *tx_buf, char *rx_buf,
	uint32_t page_num, uint32_t page_size)
{
	u32 i;
	//uint8_t i2s_idx = obj->i2s_idx;

	if ((page_num < 2) || (page_num > 4) || (page_size < 8)) {
		DBG_PRINTF(MODULE_I2S, LEVEL_INFO, "%s: PageNum(%d) valid value is 2~4; PageSize(%d must > 8)\r\n", \
			__FUNCTION__, page_num, page_size);
		return;
	}

	I2SInitStruct.I2S_PageNum = page_num;
	I2SInitStruct.I2S_PageSize = page_size/4;    // unit is 4-bytes
	I2S_SetPageSize(I2S_DEV, (page_size/4));
	I2S_SetPageNum(I2S_DEV, (page_num));
	I2S_SetDMABuf(I2S_DEV, (u8*)tx_buf, (u8*)rx_buf);

	for (i=0;i<page_num;i++) {
		I2S_SetTxPageAddr(i, (uint32_t)(tx_buf + ((page_size) * i)));
		I2S_SetRxPageAddr(i, (uint32_t)(rx_buf + ((page_size) * i)));
	}
}

/**
  * @brief  Sets TX interrupt handler.
  * @param  obj: i2s object define in application software.
  * @param  handler: TX interrupt callback function.
  * @param  id: TX interrupt callback function parameter.
  * @retval none
  */
void i2s_tx_irq_handler(i2s_t *obj, i2s_irq_handler handler, uint32_t id)
{
	//uint8_t i2s_idx = obj->i2s_idx;

	I2SUserCB.TxCCB = handler;
	I2SUserCB.TxCBId = id;
}

/**
  * @brief  Sets RX interrupt handler.
  * @param  obj: i2s object define in application software.
  * @param  handler: RX interrupt callback function.
  * @param  id: RX interrupt callback function parameter.
  * @retval none
  */
void i2s_rx_irq_handler(i2s_t *obj, i2s_irq_handler handler, uint32_t id)
{
	//uint8_t i2s_idx = obj->i2s_idx;

	I2SUserCB.RxCCB = handler;
	I2SUserCB.RxCBId = id;
}

/**
  * @brief  Sets i2s data transfer direction.
  * @param  obj: i2s object define in application software.
  * @param  trx_type: transfer direction.
  *          This parameter can be one of the following values:
  *            @arg I2S_DIR_RX: Rx receive direction
  *            @arg I2S_DIR_TX: Tx transmission direction
  *            @arg I2S_DIR_TXRX: Tx & Rx bi-direction
  * @retval none
  */
void i2s_set_direction(i2s_t *obj, int trx_type)
{
	obj->direction = trx_type; 

	I2SInitStruct.I2S_TRxAct = trx_type;
	I2S_SetDirection(I2S_DEV, trx_type);

	if (trx_type == I2S_DIR_TX) {
		I2S_RxDmaCmd(I2S_DEV, DISABLE);
	} else if ((trx_type == I2S_DIR_TXRX) ||(trx_type == I2S_DIR_RX) ) {
		I2S_RxDmaCmd(I2S_DEV, ENABLE);
	}
}

/**
  * @brief  Sets i2s channel number, sample rate, word length.
  * @param  obj: i2s object define in application software.
  * @param  channel_num: this parameter can be one of the following values:
  *            @arg CH_STEREO: stereo channel
  *            @arg CH_MONO: mono channel
  * @param  rate: this parameter can be one of the following values:
  *            @arg SR_8KHZ: sample rate is 8kHz
  *            @arg SR_16KHZ: sample rate is 16kHz
  *            @arg SR_24KHZ: sample rate is 24kHz
  *            @arg SR_32KHZ: sample rate is 32kHz
  *            @arg SR_48KHZ: sample rate is 48kHz
  *            @arg SR_96KHZ: sample rate is 96kHz
  *            @arg SR_7p35KHZ: sample rate is 7.35kHz
  *            @arg SR_14p7KHZ: sample rate is 14.7kHz
  *            @arg SR_22p05KHZ: sample rate is 22.05kHz
  *            @arg SR_29p4KHZ: sample rate is 29.4kHz
  *            @arg SR_44p1KHZ: sample rate is 44.1kHz
  *            @arg SR_88p2KHZ: sample rate is 88.2kHz
  * @param  word_len: this parameter can be one of the following values:
  *            @arg WL_16b: sample bit is 16 bit
  *            @arg WL_24b: sample bit is 24 bit
  * @retval none
  */
void i2s_set_param(i2s_t *obj, int channel_num, int rate, int word_len)
{
	obj->channel_num = channel_num;
	obj->sampling_rate = rate;
	obj->word_length = word_len;

	I2SInitStruct.I2S_ChNum = channel_num;
	I2SInitStruct.I2S_Rate = rate;
	I2SInitStruct.I2S_WordLen = word_len;
	I2S_SetChNum(I2S_DEV, I2SInitStruct.I2S_ChNum);
	I2S_SetRate(I2S_DEV, rate);
	I2S_SetWordLen(I2S_DEV, I2SInitStruct.I2S_WordLen);
}

/**
  * @brief  Deinitializes the I2S device, include function/interrupt/I2S registers.
  * @param  obj: i2s object define in application software.
  * @retval none
  */
void i2s_deinit(i2s_t *obj)
{
	//uint8_t i2s_idx = obj->i2s_idx;
	IRQn_Type IrqNum = I2S0_PCM0_IRQ;

	/*I2S Interrupt DeInitialization*/
	InterruptDis(IrqNum);
	InterruptUnRegister(IrqNum);
	
	/*I2S Disable Module*/
	I2S_INTConfig(I2S_DEV, 0, 0);
	I2S_Cmd(I2S_DEV, DISABLE);

	i2s_sw_reset();
}

/**
  * @brief  Gets current tx page address.
  * @param  obj: i2s object define in application software.
  * @retval address of current tx page or NULL
  * @note current page own by cpu, return address of current tx page
  * @note current page own by i2s, return NULL
  */
int* i2s_get_tx_page(i2s_t *obj)
{
	//uint8_t i2s_idx = obj->i2s_idx;
	u8 cur_tx_page;

	cur_tx_page = I2S_GetTxPage(I2S_DEV);
	if (!I2S_TxPageBusy(I2S_DEV, cur_tx_page)) {
		return ((int*)I2S_GetTxPageAddr(cur_tx_page));
	} else {
		return NULL;
	}
}

/**
  * @brief  Sets current tx page own by i2s.
  * @param  obj: i2s object define in application software.
  * @param  pbuf: tx buffer adderss.
  * @retval none
  */
void i2s_send_page(i2s_t *obj, uint32_t *pbuf)
{
	u32 cur_tx_page;

	cur_tx_page = I2S_GetTxPage(I2S_DEV);

	if (I2S_GetTxPageAddr(cur_tx_page) != (uint32_t)pbuf)
		DBG_8195A("%s: tx buffer not match cur_tx_page \n", __func__);

	I2S_TxPageDMA_EN(I2S_DEV, cur_tx_page);
}

/**
  * @brief  Sets current rx page own by i2s.
  * @param  obj: i2s object define in application software.
  * @retval none
  */
void i2s_recv_page(i2s_t *obj)
{
	u32 cur_rx_page;

	cur_rx_page = I2S_GetRxPage(I2S_DEV);

	if ((I2S_DEV->IS_RX_PAGE_OWN[cur_rx_page] & BIT(31)) == 0) {
		I2S_RxPageDMA_EN(I2S_DEV,cur_rx_page);
	} else {
		//DBG_8195A("i2s_recv_page: re-enable\r\n");
	}
}

/**
  * @brief  Enable i2s interrupt and function.
  * @retval none
  */
void i2s_enable(i2s_t *obj)
{
	//uint8_t i2s_idx = obj->i2s_idx;

	I2S_Cmd(I2S_DEV, ENABLE);
	I2S_INTConfig(I2S_DEV, (I2S_TX_INT_PAGE0_OK|I2S_TX_INT_PAGE1_OK| I2S_TX_INT_PAGE2_OK|I2S_TX_INT_PAGE3_OK),
		(I2S_RX_INT_PAGE0_OK|I2S_RX_INT_PAGE1_OK | I2S_RX_INT_PAGE2_OK|I2S_RX_INT_PAGE3_OK));
}

/**
  * @brief  Disable i2s interrupt and function.
  * @retval none
  */
void i2s_disable(i2s_t *obj)
{
	//uint8_t i2s_idx = obj->i2s_idx;
	I2S_INTConfig(I2S_DEV, 0, 0);
	
	I2S_Cmd(I2S_DEV, DISABLE);

	i2s_sw_reset();
}
/******************* (C) COPYRIGHT 2016 Realtek Semiconductor *****END OF FILE****/