#include "SWM341.h"
#include <string.h>

#define SPI0_CS_Low()	GPIO_ClrBit(GPIOM, PIN3)
#define SPI0_CS_High()	GPIO_SetBit(GPIOM, PIN3)

uint16_t SPI1RXBuffer[32] = {0};
uint32_t SPI1RXIndex = 0;


void SerialInit(void);
void SPIMstInit(void);
void SPISlvInit(void);

int main(void)
{	
	uint32_t n, i;
	uint32_t rxdata, txdata = 0x23;
	
	SystemInit();
	
	SerialInit();
	
	SPIMstInit();
	
	SPISlvInit();
	
	while(1==1)
	{
		SPI0_CS_Low();
		for(i = 0; i < 1200; i++);				// CS拉低后需要延时一下再发送
		for(i = 0; i < 16; i++)
		{
			SPI0->DATA = i;
			while((SPI0->STAT & SPI_STAT_TFNF_Msk) == 0) __NOP();
		}
		while(SPI_IsTXEmpty(SPI0) == 0) __NOP();
		for(i = 0; i < 12000; i++) __NOP();		// 发送FIFO虽已空，但最后一个数据还在发送移位寄存器里，需要延时等待它发送出去
		SPI0_CS_High();
		
		for(i = 0; i < SystemCoreClock/4; i++) __NOP();
	}
}


void SPIMstInit(void)
{
	SPI_InitStructure SPI_initStruct;
	
	GPIO_Init(GPIOM, PIN3, 1, 0, 0, 0);
	SPI0_CS_High();
	
	PORT_Init(PORTM, PIN2, PORTM_PIN2_SPI0_SCLK, 0);
	PORT_Init(PORTM, PIN4, PORTM_PIN4_SPI0_MISO, 1);
	PORT_Init(PORTM, PIN5, PORTM_PIN5_SPI0_MOSI, 0);
	
	SPI_initStruct.clkDiv = SPI_CLKDIV_32;
	SPI_initStruct.FrameFormat = SPI_FORMAT_SPI;
	SPI_initStruct.SampleEdge = SPI_SECOND_EDGE;
	SPI_initStruct.IdleLevel = SPI_HIGH_LEVEL;
	SPI_initStruct.WordSize = 8;
	SPI_initStruct.Master = 1;
	SPI_initStruct.RXThreshold = 0;
	SPI_initStruct.RXThresholdIEn = 0;
	SPI_initStruct.TXThreshold = 0;
	SPI_initStruct.TXThresholdIEn = 0;
	SPI_initStruct.TXCompleteIEn = 0;
	SPI_Init(SPI0, &SPI_initStruct);
	SPI_Open(SPI0);
}


void SPISlvInit(void)
{
	SPI_InitStructure SPI_initStruct;
	
	PORT_Init(PORTB, PIN2, PORTB_PIN2_SPI1_SCLK, 1);
	PORT_Init(PORTB, PIN3, PORTB_PIN3_SPI1_MISO, 0);
	PORT_Init(PORTB, PIN4, PORTB_PIN4_SPI1_MOSI, 1);
	PORT_Init(PORTB, PIN5, PORTB_PIN5_SPI1_SSEL, 1);
	
	SPI_initStruct.clkDiv = 1;
	SPI_initStruct.FrameFormat = SPI_FORMAT_SPI;
	SPI_initStruct.SampleEdge = SPI_SECOND_EDGE;
	SPI_initStruct.IdleLevel = SPI_HIGH_LEVEL;
	SPI_initStruct.WordSize = 8;
	SPI_initStruct.Master = 0;
	SPI_initStruct.RXThreshold = 4;
	SPI_initStruct.RXThresholdIEn = 1;
	SPI_initStruct.TXThreshold = 0;
	SPI_initStruct.TXThresholdIEn = 0;
	SPI_initStruct.TXCompleteIEn = 0;
	SPI_Init(SPI1, &SPI_initStruct);
	
	SPI_INTEn(SPI1, SPI_IT_RX_OVF);	// 溢出后SPI不再接收数据，因此需要在溢出中断中清空RXFIFO
	
	SPI1->IE |= (1 << SPI_IE_SSRISE_Pos);	//开启SPI_SSEL上升沿中断
	
	SPI_Open(SPI1);
}

void SPI1_Handler(void)
{	
	if(SPI_INTStat(SPI1, SPI_IT_RX_OVF))
	{
		SPI1->CTRL |= SPI_CTRL_RFCLR_Msk;
		__NOP();__NOP();__NOP();__NOP();
		SPI1->CTRL &= ~SPI_CTRL_RFCLR_Msk;

		SPI_INTClr(SPI1, SPI_IT_RX_OVF);
	}
	
	if(SPI1->IF & SPI_IF_RFTHR_Msk)
	{
		while(SPI1->STAT & SPI_STAT_RFNE_Msk)
		{
			SPI1RXBuffer[SPI1RXIndex++] = SPI1->DATA;
		}
		
		SPI1->IF = (1 << SPI_IF_RFTHR_Pos);
	}
	
	if(SPI1->IF & SPI_IF_SSRISE_Msk)
	{
		while(SPI1->STAT & SPI_STAT_RFNE_Msk)
		{
			SPI1RXBuffer[SPI1RXIndex++] = SPI1->DATA;
		}
		
		SPI1->IF = (1 << SPI_IF_SSRISE_Pos);
		
		/* 检测到SPI_SSEL引脚上升沿，一帧接收完成 */
		for(uint32_t i = 0; i < SPI1RXIndex; i++)
			printf("%d, ", SPI1RXBuffer[i]);
		printf("\r\n\r\n");
		
		SPI1RXIndex = 0;
		memset(SPI1RXBuffer, 0, sizeof(SPI1RXBuffer));
	}
}


void SerialInit(void)
{
	UART_InitStructure UART_initStruct;
	
	PORT_Init(PORTM, PIN0, PORTM_PIN0_UART0_RX, 1);	//GPIOM.0配置为UART0输入引脚
	PORT_Init(PORTM, PIN1, PORTM_PIN1_UART0_TX, 0);	//GPIOM.1配置为UART0输出引脚
 	
 	UART_initStruct.Baudrate = 57600;
	UART_initStruct.DataBits = UART_DATA_8BIT;
	UART_initStruct.Parity = UART_PARITY_NONE;
	UART_initStruct.StopBits = UART_STOP_1BIT;
	UART_initStruct.RXThresholdIEn = 0;
	UART_initStruct.TXThresholdIEn = 0;
	UART_initStruct.TimeoutIEn = 0;
 	UART_Init(UART0, &UART_initStruct);
	UART_Open(UART0);
}

/****************************************************************************************************************************************** 
* 函数名称: fputc()
* 功能说明: printf()使用此函数完成实际的串口打印动作
* 输    入: int ch		要打印的字符
*			FILE *f		文件句柄
* 输    出: 无
* 注意事项: 无
******************************************************************************************************************************************/
int fputc(int ch, FILE *f)
{
	UART_WriteByte(UART0, ch);
	
	while(UART_IsTXBusy(UART0));
 	
	return ch;
}