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

char str_hi[] = "Hi from Synwit\n";

void SerialInit(void);

int main(void)
{
	DMA_InitStructure DMA_initStruct;
	
	SystemInit();
	
	SerialInit();
	
	DMA_initStruct.Mode = DMA_MODE_CIRCLE;
	DMA_initStruct.Unit = DMA_UNIT_BYTE;
	DMA_initStruct.Count = strlen(str_hi);
	DMA_initStruct.MemoryAddr = (uint32_t)str_hi;
	DMA_initStruct.MemoryAddrInc = 1;
	DMA_initStruct.PeripheralAddr = (uint32_t)&UART0->DATA;
	DMA_initStruct.PeripheralAddrInc = 0;
	DMA_initStruct.Handshake = DMA_EXMRD_TIMR0;
	DMA_initStruct.Priority = DMA_PRI_LOW;
	DMA_initStruct.INTEn = 0;
	DMA_CH_Init(DMA_CH0, &DMA_initStruct);
	DMA_CH_Open(DMA_CH0);
	
	TIMR_Init(TIMR0, TIMR_MODE_TIMER, CyclesPerUs, 500000, 0);	//每0.5秒钟触发DMA向UART0->DATA搬运一个字节
	TIMR_Start(TIMR0);
	
	while(1==1)
	{
	}
}


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;
}
