Hello,
I'm using the LPC1227 to read data from an accelerometer via SPI. I configured the SPI using some functions in the SPP library. The accelerometer sensor is the LSM6DS3. This sensor has an only read register (who is called "WHO_I_AM") which its value is always 0x69. In order to test the spi communication I wanted to see if I can get this value in the SSP data register (DR). The problem is that I'm always getting a 0 in this data register. Could someone please check this code below and tell me if I did something wrong. I also attached the SPP library from where I used these functions. Thank you!
LPC_GPIO0->DIR|=1<<1; // MEMS CS
LPC_GPIO0->DIR|=(1<<17); // MOSI
LPC_GPIO0->DIR&=~(1<<16); // MISO
LPC_GPIO0->DIR|=1<<14; // SCK
// **************** PIN CONFIGURATION **************************
LPC_IOCON->PIO0_14&=~(0b111<<0); // Select SCK on PIO0_14
LPC_IOCON->PIO0_14|=(1<<1);
LPC_IOCON->PIO0_1 &=~(0b111<<0); // Select MEMS nCS
LPC_IOCON->PIO0_16&=~(0b111<<0); // Select MISO on PIO0_16
LPC_IOCON->PIO0_16|=(1<<1);
LPC_IOCON->PIO0_17&=~(0b111<<0); // Select MOSI on PIO0_17
LPC_IOCON->PIO0_17 |=(1<<1);
LPC_GPIO0->OUT&=~(1<<1); // nCS MEMS = 0
// *********** MEMS SPI CONFIGURATION ************* //
SSP_InitTypeDef param_MEMS;
(param_MEMS).CPHA=0;
(param_MEMS).CPOL=0;
(param_MEMS).Mode=0;
(param_MEMS).FrameFormat=0;
(param_MEMS).DataSize=0;
(param_MEMS).DataSize|=DATASIZE_8<<0; // transfert de 8 bits (attention Datasize est un uint16_t)
(param_MEMS).CPHA|=1<<7; // voir p 37 datasheet du MEMS
(param_MEMS).CPOL|=1<<6; // garde le sck à l'état haut entre deux transferts et MISO ET MOSI en high impedance
(param_MEMS).FrameFormat&=~(0b11<<4);
(param_MEMS).Mode&=~(1<<2);
// **************** CONFIGURATION DU SPI ****************************
SSP_DeInit(); // Deinitializes the SSP peripheral registers to their default reset values.
SSP_Init(¶m_MEMS); // Initialization
SSP_SetClockRate(MEMS_SPI_CLK); // 10 MHz Max
SSP_Cmd(ENABLE); // Enable SPI
SSP_LoopbackCmd(DISABLE); // Normal mode operation
SSP_SlaveOutputCmd(DISABLE); // Slave mode disabled
// **************** MEMS TEST ********************
int who_i_am=0;
SSP_Test_Send_Data(0x8F);
SSP_Test_Send_Data(0);
who_i_am =SSP_Test_Receive_Data();
