[参考译文] TMS320F28027：tms320f28027

#include "DSP28x_Project.h" // Device Headerfile and Examples Include File

//
// Note: I2C Macros used in this example can be found in the
// f2802x_I2C_defines.h file
//
#define VL53L0X_EXPECTED_DEVICE_ID (0xEE)
#define REG_IDENTIFICATION_MODEL_ID (0xC0)
//
// Function Prototypes
//
void I2CA_Init(void);
bool i2c_write_byte(uint8_t byte);
bool i2c_read_byte(uint8_t *received_byte);
bool i2c_read_byte(uint8_t *received_byte);
bool i2c_read_addr16_data8(uint8_t addr, uint8_t *data);
static bool device_is_booted();



// Main

uint8_t registervalue=0;
void main(void)
{
//
// WARNING: Always ensure you call memcpy before running any functions from
// RAM InitSysCtrl includes a call to a RAM based function and without a
// call to memcpy first, the processor will go "into the weeds"
#ifdef _FLASH
memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif


InitSysCtrl();
InitI2CGpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
I2CA_Init();


device_is_booted();

}










// I2CA_Init -
//
void
I2CA_Init(void)
{
//
// Initialize I2C
//
I2caRegs.I2CSAR = 0x52; // Slave address - EEPROM control code

//
// I2CCLK = SYSCLK/(I2CPSC+1)
//
/*#if (CPU_FRQ_40MHZ||CPU_FRQ_50MHZ)
I2caRegs.I2CPSC.all = 4; // Prescaler - need 7-12 Mhz on module clk
#endif*/

#if (CPU_FRQ_60MHZ)
I2caRegs.I2CPSC.all = 6; // Prescaler - need 7-12 Mhz on module clk
#endif
I2caRegs.I2CCLKL = 10; // NOTE: must be non zero
I2caRegs.I2CCLKH = 5; // NOTE: must be non zero
I2caRegs.I2CIER.all = 0x24; // Enable SCD & ARDY interrupts

//
// Take I2C out of reset. Stop I2C when suspended
//
I2caRegs.I2CMDR.all = 0x0020;

I2caRegs.I2CFFTX.all = 0x6000; // Enable FIFO mode and TXFIFO
I2caRegs.I2CFFRX.all = 0x2040; // Enable RXFIFO, clear RXFFINT,

return;
}

bool i2c_write_byte(uint8_t byte)
{
bool success = false;

// Set up master as transmitter and send start condition
I2caRegs.I2CSAR =0X52; // Set slave address
I2caRegs.I2CCNT = 1; // Transmit one byte
I2caRegs.I2CMDR.bit.TRX = 1; // Set transmitter mode
I2caRegs.I2CMDR.bit.MST = 1; // Send start condition

// Fill the transmit buffer with the byte to be sent
I2caRegs.I2CDXR = byte;

// Wait for start condition to be sent
while (I2caRegs.I2CSTR.bit.BB == 1);

// Check for NACK error flag
success = !(I2caRegs.I2CSTR.bit.NACK);

if (success) {
// Wait for byte to be sent
while (I2caRegs.I2CSTR.bit.XRDY);

// Check for NACK error flag
success = !(I2caRegs.I2CSTR.bit.NACK);
}

// Send stop condition
I2caRegs.I2CMDR.bit.STP = 1;

// Wait for stop condition to be sent
while (I2caRegs.I2CMDR.bit.STP == 1);

// Check for NACK error flag
success = !(I2caRegs.I2CSTR.bit.NACK);

return success;
}


bool i2c_read_byte(uint8_t *received_byte)
{
bool success = false;

// Set up master as receiver and send start condition
I2caRegs.I2CSAR = 0x52; // Set slave address
I2caRegs.I2CCNT = 1; // Receive one byte
I2caRegs.I2CMDR.bit.TRX = 0; // Set receiver mode
I2caRegs.I2CMDR.bit.MST = 1; // Send start condition

// Wait for start condition to be sent
while (I2caRegs.I2CSTR.bit.BB == 1);

// Check for NACK error flag
success = !(I2caRegs.I2CSTR.bit.NACK);

// Send stop condition because we only want to read one byte
I2caRegs.I2CMDR.bit.STP = 1;

// Wait for stop condition to be sent
while (I2caRegs.I2CMDR.bit.STP == 1);

// Check for NACK error flag
success &= !(I2caRegs.I2CSTR.bit.NACK);

if (success) {
// Wait for byte before reading the buffer
while (I2caRegs.I2CSTR.bit.RRDY == 0);

// Read received byte
*received_byte = (uint8_t)I2caRegs.I2CDRR;

// Clear RX interrupt flag

}

return success;
}

bool i2c_read_addr8_data8(uint8_t addr, uint8_t *data)
{ bool success = false;

// Configure master for transmitting bytes
I2caRegs.I2CCNT = 1; 
I2caRegs.I2CDXR = addr; 
I2caRegs.I2CMDR.all = 0x6E20; 
while (I2caRegs.I2CSTR.bit.BB == 1);

// Reconfigure master for reading bytes
I2caRegs.I2CCNT = 1;
I2caRegs.I2CMDR.all = 0x2620; 
while (I2caRegs.I2CSTR.bit.BB == 1);

// Read the byte (register value)
if (I2caRegs.I2CSTR.bit.NACK == 0 && I2caRegs.I2CSTR.bit.RRDY == 1) {
uint8_t registervalue = I2caRegs.I2CDRR; 
}
return success;
}

static bool device_is_booted()
{
uint8_t device_id = 0;
if (!i2c_read_addr8_data8(REG_IDENTIFICATION_MODEL_ID, &device_id)) {
return false;
}
return device_id == VL53L0X_EXPECTED_DEVICE_ID;
}