Question

我正在研究名为TSL2301的行扫描ccd传感器。我想通过USART的stm32f103读取像素，但我总是可以接收0xFF，是否有人使用此传感器来帮助我？我使用了Usart同步模式的STM32f10x，我通过Usart向传感器发送了一些命令，并希望在每个命令后产生8个时钟延迟。我怎么能这样做？

int count=0;
int i=0;
uint8_t data[102]={0};
USART_ClockInitStructure.USART_Clock = USART_Clock_Enable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_High;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Enable;
USART_ClockInit(USARTy, &USART_ClockInitStructure);

USART_InitStructure.USART_BaudRate = 2200000;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USARTy, &USART_InitStructure);

/* Configure the USARTy */
USART_Init(USARTy, &USART_InitStructure);

/* Enable the USARTy */
USART_Cmd(USARTy, ENABLE);

while(1)
{
while(count < 3)       
{                                               
USART_SendData(USARTy,0xFF);
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);
count++;
}
count=0;
USART_SendData(USARTy,0x1b);      //RESET command
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);

USART_SendData(USARTy,0x1b);
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);

USART_SendData(USARTy,0x1b);
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);

USART_SendData(USARTy,0x08);  //StartInt Command
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);

while(count < 20 )//DelayIntegrationTime() ;
{
USART_SendData(USARTy,0xFF);
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);
count++;
}
count = 0;  
USART_SendData(USARTy,0x10);    //SampleInt Command
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);

USART_SendData(USARTy,0x02);        //ReadPixel Command
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);

while(count < 2)
{
USART_SendData(USARTy,0xFF);
while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);
count++;
}
count = 0;

 USART_Cmd(USARTy, DISABLE);
 USART_ClockInitStructure.USART_CPOL = USART_CPOL_High;
 USART_ClockInitStructure.USART_CPHA = USART_CPHA_1Edge;
 USART_ClockInit(USARTy, &USART_ClockInitStructure);
 USART_Init(USARTy, &USART_InitStructure);
 USART_Cmd(USARTy, ENABLE);

/*read pixels*/
for (i = 0; i < 102; i++) 
{
   while(USART_GetFlagStatus(USARTy, USART_FLAG_RXNE) == RESET);
   data[i] = USART_ReceiveData(USARTy);
   while(count < 1) 
   {
   USART_SendData(USARTy,0xFF);
   while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET);
   count++;
   }
   count = 0;
 }

 USART_Cmd(USARTy, DISABLE);
 USART_ClockInitStructure.USART_CPOL = USART_CPOL_High;
 USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
 USART_ClockInit(USARTy, &USART_ClockInitStructure);
 USART_Init(USARTy, &USART_InitStructure);
 USART_Cmd(USARTy, ENABLE);

}

Answer 1

STM32F103参考手册和TAOS数据表中有不同的USART时序图。我认为他们不会在USART模式下一起工作。

作为一个想法，您可以尝试使用UART而不是USART。并使用MCO或其他时钟源为器件提供时钟。我认为它应该有用。

在这种情况下，您可以使用计时器进行所有延迟。

PS：但是还有一个问题需要解决，就是将UART的输出与时钟源同步。我需要更仔细地阅读stm32手册，告诉你如何做到这一点。我稍后会这样做

如何使用TSL2301并在usart中进行时钟延迟

1 个答案: