DRV2604L Loading data to RAM and Waveform Sequencer

Hi Anny,

Have you looked through the datasheet section 8.5.8.2.4? This is a good starting point. How are you trying to program the RAM? We have a RAM manager tool in our Haptic Control Console software.

Regards,
Kelly Griffin
Haptics Application Engineer

Hi Kelley, I have indeed looked through that section. So far, this is what I have done in regards to the RAM:

unsigned char StrongClickHeader[]={
0x01,0x00,0x04};
unsigned char StrongClickData[]={
0x3F,0x09,0x41,0x08
};

void initializeRAM() { //PAGE 61
//---wake up device--
writeRegister(REG_MODE, MODE_INTTRIG); //0X00
writeRegister(RAM_REV,0);

//---write header--- 
writeRegister(RAM_ADDR_UB,0x00);
writeRegister(RAM_ADDR_LB, 0x00);
writeRegister(RAM_DATA,(unsigned char)*StrongClickHeader);


//---load waveform data
writeRegister(RAM_ADDR_UB,0x01);
writeRegister(RAM_ADDR_LB, 0x00);

writeRegister(RAM_DATA,(unsigned char)*StrongClickData);
checkRegister(RAM_DATA,"RAM DATA 2");

}

What I am uncertain is how to load an array into the RAM and if the code seems correct.

Hi, Anny:

it should be programmed like below:

unsigned char StrongClickHeader[]={
0x01,0x00,0x04};
unsigned char StrongClickData[]={
0x3F,0x09,0x41,0x08
};

void initializeRAM() { //PAGE 61
//---wake up device--
writeRegister(REG_MODE, MODE_INTTRIG); //0X00

//---write header---
writeRegister(RAM_ADDR_UB,0x00);
writeRegister(RAM_ADDR_LB, 0x00);
writeRegister(RAM_DATA,0); //revison byte
writeRegister(RAM_DATA, StrongClickHeader);


//---load waveform data
writeRegister(RAM_ADDR_UB,0x01);
writeRegister(RAM_ADDR_LB, 0x00);
writeRegister(RAM_DATA,(unsigned char)*StrongClickData);
}

Thanks for your reply, Peter!

I am encountering this bug (invalid conversion from 'unsigned char*' to 'uint8_t {aka unsigned char}' [-fpermissive]) 

with this line: 

writeRegister(RAM_DATA, StrongClickHeader);

my function writeRegister is as follows: 

void writeRegister(uint8_t regstr, uint8_t val) {
// use i2c
Wire.beginTransmission(DRV2604L_ADDR);
Wire.write((byte)regstr);
Wire.write((byte)val);
Wire.endTransmission();
}

should it be uint8_t*val, or do I have it all wrong?

Again, thanks!

Thanks, Peter! now everything works perfectly!!

If I happen to load more than one waveform, do I still write it into the RAM_DATA register or do I have to deal with the Waveform Sequencers (0x04 to 0x0B)?

Hi, Anny:

if you have more than one waveform, and we assume each waveform is different, we need to program the waveforms into DRV2604L in-chip RAM (follow the format defined in the data sheet).
if you want to play only one effect, just put the effect ID (index) to the sequencer register 0x04, then trigger the playback by GO register (0x0c).
if you want to play multiple effects, then put the effects into the sequence registers (0x04~0x0b, so maximum 8 effects one time), then use GO register to trigger the playback