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75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
#include "SWM221.h"
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#include <string.h>
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char str_hi[] = "Hi from Synwit\n";
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void SerialInit(void);
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int main(void)
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{
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DMA_InitStructure DMA_initStruct;
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SystemInit();
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SerialInit();
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DMA_initStruct.Mode = DMA_MODE_CIRCLE;
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DMA_initStruct.Unit = DMA_UNIT_BYTE;
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DMA_initStruct.Count = strlen(str_hi);
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DMA_initStruct.MemoryAddr = (uint32_t)str_hi;
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DMA_initStruct.MemoryAddrInc = 1;
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DMA_initStruct.PeripheralAddr = (uint32_t)&UART0->DATA;
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DMA_initStruct.PeripheralAddrInc = 0;
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DMA_initStruct.Handshake = DMA_EXMRD_TIMR0;
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DMA_initStruct.Priority = DMA_PRI_LOW;
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DMA_initStruct.INTEn = 0;
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DMA_CH_Init(DMA_CH0, &DMA_initStruct);
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DMA_CH_Open(DMA_CH0);
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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
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TIMR_Start(TIMR0);
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while(1==1)
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{
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}
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}
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void SerialInit(void)
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{
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UART_InitStructure UART_initStruct;
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PORT_Init(PORTA, PIN0, PORTA_PIN0_UART0_RX, 1); //GPIOA.0配置为UART0 RXD
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PORT_Init(PORTA, PIN1, PORTA_PIN1_UART0_TX, 0); //GPIOA.1配置为UART0 TXD
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UART_initStruct.Baudrate = 57600;
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UART_initStruct.DataBits = UART_DATA_8BIT;
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UART_initStruct.Parity = UART_PARITY_NONE;
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UART_initStruct.StopBits = UART_STOP_1BIT;
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UART_initStruct.RXThreshold = 3;
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UART_initStruct.RXThresholdIEn = 0;
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UART_initStruct.TXThreshold = 3;
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UART_initStruct.TXThresholdIEn = 0;
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UART_initStruct.TimeoutTime = 10;
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UART_initStruct.TimeoutIEn = 0;
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UART_Init(UART0, &UART_initStruct);
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UART_Open(UART0);
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}
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/******************************************************************************************************************************************
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* 函数名称: fputc()
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* 功能说明: printf()使用此函数完成实际的串口打印动作
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* 输 入: int ch 要打印的字符
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* FILE *f 文件句柄
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* 输 出: 无
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* 注意事项: 无
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******************************************************************************************************************************************/
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int fputc(int ch, FILE *f)
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{
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UART_WriteByte(UART0, ch);
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while(UART_IsTXBusy(UART0));
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return ch;
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}
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