void ZigBee_WriteReg(uint8_t addr, uint8_t val)
{
SPI_TypeDef* SPI = MAKENAME(SPI,ZIGBEE_SPI);
//read off any remaining bytes
while(SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE))
SPI_ReceiveData8(SPI);
//enable NSS pin
PullDown();
_delay_us(1);
//wait until TX buffer is empty
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_TXE));
uint8_t cmd = addr;
cmd |= 0xC0; // write cmd
SPI_SendData8(SPI, cmd);
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
SPI_ReceiveData8(SPI);
SPI_SendData8(SPI, val);
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
SPI_ReceiveData8(SPI);
_delay_us(1);
PullUp();
}
void ZigBee_ReadFrame(uint8_t * data, uint8_t * len)
{
uint8_t resp;
SPI_TypeDef* SPI = MAKENAME(SPI,ZIGBEE_SPI);
//read off any bytes in the buffer
while(SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
resp = SPI_ReceiveData8(SPI);
//enable select pin
PullDown();
_delay_us(1);
//wait until TX buffer is empty
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_TXE));
//send the read command
SPI_SendData8(SPI, 0x20);
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
resp = SPI_ReceiveData8(SPI);
//receive the buffer length
SPI_SendData8(SPI, 0);
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
resp = SPI_ReceiveData8(SPI);
uint8_t nbytes = resp+3; //packet + lqi + ed + status (link quality indicatior) (energy detection)
*len = nbytes; //set the return value
// Datasheet says max buffer access is 5 + frame length = 132
// 2 reads come before frame, 3 after
// First 2 reads not included in nbytes
// Therefore, max nbytes size is 132 - 2 = 130
if (nbytes > 130)
{
*len = 0;
_delay_us(1);
PullUp();
return;
}
for (uint8_t ii=0; ii<nbytes; ii++)
{
SPI_SendData8(SPI, 0);
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
resp = SPI_ReceiveData8(SPI); //receive data
*data++ = resp;
}
_delay_us(1);
PullUp();
}
uint8_t ZigBee_WriteFrame(const void* data, uint8_t len)
{
if (len > MAX_ZIGBEE_PACKET_BYTES)
return -1;
SPI_TypeDef* SPI = MAKENAME(SPI,ZIGBEE_SPI);
const uint8_t *tx_ptr = data;
//clear any remaining bytes
while(SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE))
SPI_ReceiveData8(SPI);
PullDown();
_delay_us(1);
//wait until TX buffer is empty
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_TXE));
SPI_SendData8(SPI, 0x60);
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
SPI_ReceiveData8(SPI);
SPI_SendData8(SPI, len+2); //two extra bytes for the 16-bit CRC
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
SPI_ReceiveData8(SPI);
for(int ii = 0; ii < len; ii++)
{
SPI_SendData8(SPI, tx_ptr[ii]);
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
SPI_ReceiveData8(SPI);
}
_delay_us(1);
PullUp();
ZigBee_WriteReg(REG_TRX_STATE, 0x02); //alternate method for signaling to send
return 0;
}
void ZigBee_ReadReg(uint8_t addr, uint8_t len, uint8_t * dest)
{
uint8_t resp;
SPI_TypeDef* SPI = MAKENAME(SPI,ZIGBEE_SPI);
//read off any remaining bytes
while(SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE))
resp = SPI_ReceiveData8(SPI);
PullDown();
_delay_us(1);
for(uint8_t ii=0; ii<len; ii++)
{
//wait until TX buffer is empty
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_TXE));
uint8_t cmd = addr;
cmd |= 0x80; // read cmd
SPI_SendData8(SPI, cmd); //send the command
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
resp = SPI_ReceiveData8(SPI); //this is PHY_STATUS byte from ZigBee
SPI_SendData8(SPI, 0); // send dummy
while(!SPI_I2S_GetFlagStatus(SPI, SPI_I2S_FLAG_RXNE));
resp = SPI_ReceiveData8(SPI);
*dest++ = resp;
}
_delay_us(1);
PullUp();
}
void GPIO_PORT::SetupGPIO_InPullDown (GPIO_PIN_N pin)
{
*_pGPIO_MODER &= ~(3<<pin*2);
*_pGPIO_MODER |= GPIO_MODE_IN<<pin*2;
PullDown(pin);
}
