[ARM] SPI comunication L9958(Low RDSON SPI controlled H-Bridge) with LPC2103 controller

[KVSN91]

hi,
i am controlling a dc motor using L9958 with LPC2103 controller. I am new to ARM.

L9958 is SPI communication based IC. To control my Device to set some registers in L9958. I can't understood how to set those bits.the registers are Configuration register and Diagnosis register.

configuration register

Bit Name

0 - LSB RES
1 DR
2 CL_1
3 CL_2
4 RES
5 RES
6 RES
7 RES
8 VSR
9 ISR
10 ISR_DIS
11 OL_ON
12 RES
13 RES
14 0
15-MSB 0

diagnosis register

0 LSB OL_OFF
1 OL_ON
2 VS_UV
3 VDD_OV
4 ILIM
5 TWARN
6 TSD
7 ACT
8 OC_LS1
9 OC_LS2
10 OC_HS1
11 OC_HS2
12 Null
13 Null
14 SGND_OFF
15 MSB SBAT_OFF

how to set these registers through SPI
please help me


thanks and regards
kvsn91

 

[KlausST]

Hi,

datasheet is your friend.
Chapter 3.3 SPI interface.

As described:
* set CS = low
* transmit 16 bits (2 bytes) of CFG_REG --> the same time you recieve 16 bits of DIA_REG.
* set CS =high

Klaus

 

[KVSN91]

Thank u Klaus sir,


i wrote like this '

   write_L9958 (unsigned int Value)
   {
     CS =0;
     SPI_TX_RX (0x08);   //LSB
     SPI_TX_RX (0x00);   // MSB
     CS = 1;
   }

Here i set Diagnosis reset (DR) bit to '0'. All diagnosis bits reset at each spi reading.
and set CL_1 & CL_2 bits to CL_1 =0, CL_2=1 (Default Value 6.6A)for regulation current levels.
And VRS & IRS set to '0' (Default as per datasheet).

i have doubt only it is correct or wrong.. is there any mistake tell.


thanks and regards
kvsn91

 

[KlausST]

Hi,

your setup seems OK.

Confusing in datasheet is the numbering of CL bits. Sometimes thas say 1 and 2, sometimes 0 and 1

Klaus