void spiWriteAddr(const unsigned char regAddr)
{
unsigned char SPICount; // Counter used to clock out the data
unsigned char SPIData; // Define a data structure for the SPI data.
//SPI_CS = 1; // Make sure we start with /CS high
SPI_CK(0); // and CK low (idle low)
SPIData = regAddr; // Preload the data to be sent with Address
//SPI_CS = 0; // Set /CS low to start the SPI cycle 25nS
// Although SPIData could be implemented as an "int", resulting in one
// loop, the routines run faster when two loops are implemented with
// SPIData implemented as two "char"s.
for (SPICount = 0; SPICount < 8; SPICount++) // Prepare to clock out the Address byte
{
if (SPIData & 0x80) // Check for a 1
SPI_MOSI(1); // and set the MOSI line appropriately
else
SPI_MOSI(0);
SPI_CK(1); // Toggle the clock line
SPI_CK(0);
SPIData <<= 1; // Rotate to get the next bit
}
}
void spiWriteData(const unsigned char regData)
{
unsigned char SPICount; // Counter used to clock out the data
unsigned char SPIData; // Define a data structure for the SPI data.
//SPI_CS = 1; // Make sure we start with /CS high
SPI_CK(0); // and CK low (idle low)
SPIData = regData; // Preload the data to be sent with Data
for (SPICount = 0; SPICount < 8; SPICount++) // Prepare to clock out the Data
{
if (SPIData & 0x80)
SPI_MOSI(1);
else
SPI_MOSI(0);
SPI_CK(1);
SPI_CK(0);
SPIData <<= 1;
}
//SPI_CS = 1;
SPI_MOSI(0);
}
unsigned char spiReadData ()
{
unsigned char SPICount; // Counter used to clock out the data
unsigned char SPIData;
//SPI_CS = 1; // Make sure we start with /CS high
SPI_CK(0); // and CK low
SPI_MOSI(0); // Reset the MOSI data line
SPIData = 0;
for (SPICount = 0; SPICount < 8; SPICount++) // Prepare to clock in the data to be fread
{
SPIData <<=1; // Rotate the data
SPI_CK(1); // Raise the clock to clock the data out of the MAX7456
SPIData += SPI_MISO; // Read the data bit
SPI_CK(0); // Drop the clock ready for th enext bit
} // and loop back
//SPI_CS = 1; // Raise CS
return ((unsigned char)SPIData); // Finally return the read data
}
unsigned char spiReadReg (const unsigned char regAddr)
{
unsigned char SPICount; // Counter used to clock out the data
unsigned char SPIData;
//SPI_CS = 1; // Make sure we start with /CS high
SPI_CK(0); // and CK low
SPIData = regAddr; // Preload the data to be sent with Address & Data
//SPI_CS = 0; // Set /CS low to start the SPI cycle
for (SPICount = 0; SPICount < 8; SPICount++) // Prepare to clock out the Address & Data
{
if (SPIData & 0x80)
SPI_MOSI(1);
else
SPI_MOSI(0);
SPI_CK(1);
SPI_CK(0);
SPIData <<= 1;
} // and loop back to send the next bit
SPI_MOSI(0); // Reset the MOSI data line
SPIData = 0;
for (SPICount = 0; SPICount < 8; SPICount++) // Prepare to clock in the data to be fread
{
SPIData <<=1; // Rotate the data
SPI_CK(1); // Raise the clock to clock the data out of the MAX7456
SPIData += SPI_MISO; // Read the data bit
SPI_CK(0); // Drop the clock ready for th enext bit
} // and loop back
//SPI_CS = 1; // Raise CS
return ((unsigned char)SPIData); // Finally return the read data
}
static void spi_write_byte(u8 out)
{
unsigned char i = 0;
for (i = 0; i < 8; i++)
{
SPI_CK(0);
SPI_CK(0);
SPI_CK(0);
SPI_CK(0);
SPI_CK(0);
SPI_CK(0); //延时用
if ((out & 0x80) ) SPI_DO(1);
else SPI_DO(0);
SPI_CK(0);
// SPI_CK(0);
// SPI_CK(0);
// SPI_CK(0);
//SPI_CK(0); //延时用
out <<= 1;
SPI_CK(1);
SPI_CK(1);//做延时用
SPI_CK(1);
SPI_CK(1);
SPI_CK(1);
SPI_CK(1);
SPI_CK(1);
}
}
