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用的是stm32的串口與ch376通訊。
因為需要設備自動判斷U盤插入， 所以根據(jù)例程寫了個查詢函數(shù): u8 Ch376_disk_connect_query(void) （代碼在下面）
發(fā)現(xiàn)先設置CH376為模式6后，再插入U盤。會造成CH376芯片死掉。（插入U盤進入模式6，可以檢測到U盤插入，拔掉U盤后也可以檢測到拔出。但是再次插入就會造成芯片死掉，串口無響應。)
?main { ?????Ch376_uart2_test(); ?????Ch376_set_usb_mode();???? ?????delay_ms(20); ????while(1) ?????{ ?????????printf("\r\n-----------------------------------\r\n"); ?????????delay_ms(1500); ?????????//Ch376_set_usb_mode(); ?????????Ch376_disk_connect_query(); ?????} ?}如果把Ch376_set_usb_mode(); 函數(shù)也放到循環(huán)中，則會測試通過。
?Ch376_uart2_test(); ?Ch376_set_usb_mode();???? ?delay_ms(20); while(1) ?{ ?????printf("\r\n-----------------------------------\r\n"); ?????delay_ms(1500); ?????Ch376_set_usb_mode(); ?????Ch376_disk_connect_query(); ?}
//---------------------------Ch376_disk_connect_query(）函數(shù)-------------------------------------------------------------
u8?Ch376_disk_connect_query(void)
{
????u8?temp;
????//如果先前產(chǎn)生中斷（串口接收到數(shù)據(jù)），查詢并清除
????if(USART_GetFlagStatus(USART2,USART_FLAG_RXNE)?==?SET)
????{?
????????temp?=?USART_ReceiveData(USART2);
????????printf("\r\nCh376_disk_connect_query()函數(shù)?查詢到上次中斷接收到串口數(shù)據(jù)為：%#X\r\n",temp);
????????Ch376_Send_Cmd(CMD01_GET_STATUS);
????????temp?=?Ch376_Read_Data();
????}
????USART_ClearFlag(USART2,USART_FLAG_RXNE);
????USART_ClearFlag(USART2,USART_FLAG_TC);
????//發(fā)送查詢U盤連接的?DISK_CONNECT?命令，會產(chǎn)生中斷。
????Ch376_Send_Cmd(0x30);
????temp?=?Ch376_Read_Data();
????printf("\r\nCh376_disk_connect_query()函數(shù)?第一次接收到串口數(shù)據(jù)為：%#X\r\n",temp);
????//查詢中斷狀態(tài)并取消中斷
????Ch376_Send_Cmd(CMD01_GET_STATUS);
????temp?=?Ch376_Read_Data();
????if(temp?==?0x14)
????{
????????printf("\r\nCh376_disk_connect_query()函數(shù)?查詢到U盤插入。第二次接收到串口數(shù)據(jù)為：%#X\r\n",temp);
????????return?1;
????}
????else?
????????printf("Ch376_disk_connect_query()函數(shù)?未查詢到U盤插入。返回值為：%#X\r\n",temp);
????????return?0;
}
熱門產(chǎn)品 :
CH339: 7端口多功能USB HUB控制器芯片
