MCU_SWM221/SPI/SimplSPI_DMA/APP/main.c

#include "SWM221.h"
#include <string.h>

char TX_Buffer[] = "Hello From Synwit\r\n";

#define BUF_SIZE  32
char RX_Buffer[BUF_SIZE] = {0};

void SerialInit(void);

int main(void)
{	
	SPI_InitStructure SPI_initStruct;
	DMA_InitStructure DMA_initStruct;
	
	SystemInit();
	
	SerialInit();
	
	PORT_Init(PORTB, PIN15, PORTB_PIN15_SPI0_SSEL, 0);
	PORT_Init(PORTB, PIN10, PORTB_PIN10_SPI0_SCLK, 0);
	PORT_Init(PORTB, PIN13, PORTB_PIN13_SPI0_MOSI, 0);	//将MOSI与MISO连接，自发、自收、然后打印
	PORT_Init(PORTB, PIN14, PORTB_PIN14_SPI0_MISO, 1);
	
	SPI_initStruct.clkDiv = SPI_CLKDIV_32;
	SPI_initStruct.FrameFormat = SPI_FORMAT_SPI;
	SPI_initStruct.SampleEdge = SPI_SECOND_EDGE;
	SPI_initStruct.IdleLevel = SPI_LOW_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);
	
	// SPI0 RX DMA
	SPI0->CTRL |= (1 << SPI_CTRL_DMARXEN_Pos);
	
	DMA_initStruct.Mode = DMA_MODE_SINGLE;
	DMA_initStruct.Unit = DMA_UNIT_BYTE;
	DMA_initStruct.Count = BUF_SIZE;
	DMA_initStruct.PeripheralAddr = (uint32_t)&SPI0->DATA;
	DMA_initStruct.PeripheralAddrInc = 0;
	DMA_initStruct.MemoryAddr = (uint32_t)RX_Buffer;
	DMA_initStruct.MemoryAddrInc = 1;
	DMA_initStruct.Handshake = DMA_CH1_SPI0RX;
	DMA_initStruct.Priority = DMA_PRI_LOW;
	DMA_initStruct.INTEn = DMA_IT_DONE;
	DMA_CH_Init(DMA_CH1, &DMA_initStruct);
	DMA_CH_Open(DMA_CH1);
	
	// SPI0 TX DMA
	SPI0->CTRL |= (1 << SPI_CTRL_DMATXEN_Pos);
	
	DMA_initStruct.Mode = DMA_MODE_SINGLE;
	DMA_initStruct.Unit = DMA_UNIT_BYTE;
	DMA_initStruct.Count = strlen(TX_Buffer);
	DMA_initStruct.MemoryAddr = (uint32_t)TX_Buffer;
	DMA_initStruct.MemoryAddrInc = 1;
	DMA_initStruct.PeripheralAddr = (uint32_t)&SPI0->DATA;
	DMA_initStruct.PeripheralAddrInc = 0;
	DMA_initStruct.Handshake = DMA_CH0_SPI0TX;
	DMA_initStruct.Priority = DMA_PRI_LOW;
	DMA_initStruct.INTEn = DMA_IT_DONE;
	DMA_CH_Init(DMA_CH0, &DMA_initStruct);
	DMA_CH_Open(DMA_CH0);
	
	while(1==1)
	{
	}
}


void GPIOB1_GPIOA9_DMA_Handler(void)
{
	uint32_t i;
	
	if(DMA_CH_INTStat(DMA_CH0, DMA_IT_DONE))
	{
		DMA_CH_INTClr(DMA_CH0, DMA_IT_DONE);
		
		for(i = 0; i < SystemCoreClock/4; i++)  __NOP();		// 延时一会儿
		
		DMA_CH_Open(DMA_CH0);	// 重新开始，再次搬运
	}
	else if(DMA_CH_INTStat(DMA_CH1, DMA_IT_DONE))
	{
		DMA_CH_INTClr(DMA_CH1, DMA_IT_DONE);
		
		for(i = 0; i < BUF_SIZE; i++)  printf("%c", RX_Buffer[i]);
		
		memset(RX_Buffer, 0x00, sizeof(RX_Buffer));
		DMA_CH_Open(DMA_CH1);	// 重新开始，再次搬运
	}
}


void SerialInit(void)
{
	UART_InitStructure UART_initStruct;
	
	PORT_Init(PORTA, PIN0, PORTA_PIN0_UART0_RX, 1);	//GPIOA.0配置为UART0 RXD
	PORT_Init(PORTA, PIN1, PORTA_PIN1_UART0_TX, 0);	//GPIOA.1配置为UART0 TXD
 	
 	UART_initStruct.Baudrate = 57600;
	UART_initStruct.DataBits = UART_DATA_8BIT;
	UART_initStruct.Parity = UART_PARITY_NONE;
	UART_initStruct.StopBits = UART_STOP_1BIT;
	UART_initStruct.RXThreshold = 3;
	UART_initStruct.RXThresholdIEn = 0;
	UART_initStruct.TXThreshold = 3;
	UART_initStruct.TXThresholdIEn = 0;
	UART_initStruct.TimeoutTime = 10;
	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;
}