According to the data sheet of the LED7708 it is not clear to me how to read the DEVCFG0 register. Since the bits OVFW, OTAF, OCAD, SCAD, contain status messages, I would like to be able to determine the cause of a fault. The firmware of the STEVAL ILL035V1 shows the following example:
//==============================================================================
// This routine sends a 16-bit word to the device
// and returns the rolled out value
//==============================================================================
u16 Write_16(u8 Destination, u16 Data_to_Send)
{
int i;
u16 flag, Mask;
u16 Received_Data=0;
int ReceivedStream[Max_Packet_Lenght];
GPIO_ResetBits(GPIOB, BUSY); // Busy LED on
Mask=0x8000;
Received_Data=0;
for(i=1; i<=16; i++)
{ // number of bits
flag = Data_to_Send&Mask;
if(flag)
{
GPIO_SetBits(GPIOA, SDO); // SDO high
GPIO_SetBits(GPIOA, SCK); // SCK high
if(GPIO_ReadInputDataBit(GPIOA, SDI))
{
Received_Data=Received_Data|Mask;
ReceivedStream[i] = ReceivedStream[i]|Mask;
ReceivedStreamNEW[i] = Received_Data;
}
GPIO_ResetBits(GPIOA, SCK); // SCK low
}
else
{
GPIO_ResetBits(GPIOA, SDO); // SDO low
GPIO_SetBits(GPIOA, SCK); // SCK high
if(GPIO_ReadInputDataBit(GPIOA, SDI))
{
Received_Data=Received_Data|Mask;
ReceivedStream[i] = ReceivedStream[i]|Mask;
ReceivedStreamNEW[i]=Received_Data;
}
GPIO_ResetBits(GPIOA, SCK); // SCK low
}
if(Destination!=0)
{
if (i==(16-Destination))
{
GPIO_SetBits(GPIOA, GPIO_Pin_4); //LE high
}
if (i==16)
{
GPIO_ResetBits(GPIOA, GPIO_Pin_4); //LE low
}
}
Mask=Mask/2;
}
GPIO_SetBits(GPIOB, BUSY); // Busy LED off
return(Received_Data);
}
Based on the latch, the operations on the LED driver are distinguished. How is distinguished whether DEVCFG0 or DEVCFG1 is written/read?
