Posted on August 07, 2014 at 18:15
When I read theWHO_AM_I register I see a 0xFF response... With my scope I can see that send the clock.
I know that my SPI works because I can communicate with my screen controller on the same SPI2. And this SPI have the same config parameters as the SPI1 on the discovery board coded by ST. So I think there is no problems about the SPI config.
About the MEMS accelerometer driver, I use the one provided by ST for the discovery board, I just changed SPI1 to SPI2.
And I always have 0xFF when I read...
void
SPI2_Config(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
// Alternate Functions connection
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
// CLOCK and MOSI and MISO Pins declaration
GPIO_InitStructure.GPIO_Pin = PIN_SCL | PIN_SI | PIN_SDO;
// PB13, PB14 and PB15 for SPI2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Init SPI 2____________________
SPI_InitTypeDef SPI_InitStruct;
SPI_I2S_DeInit(SPI2);
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStruct);
SPI_Cmd(SPI2, ENABLE);
}
void
Accelerometer_Config(
void
)
{
uint8_t ctrl = 0;
uint32_t idelay = 0;
//SysTick_Config(SystemCoreClock/ 100);
/* Set configuration of LIS302DL*/
LIS302DL_InitTypeDef LIS302DL_InitStruct;
LIS302DL_InitStruct.Power_Mode = LIS302DL_LOWPOWERMODE_ACTIVE;
LIS302DL_InitStruct.Output_DataRate = LIS302DL_DATARATE_100;
LIS302DL_InitStruct.Axes_Enable = LIS302DL_X_ENABLE | LIS302DL_Y_ENABLE | LIS302DL_Z_ENABLE;
LIS302DL_InitStruct.Full_Scale = LIS302DL_FULLSCALE_2_3;
LIS302DL_InitStruct.Self_Test = LIS302DL_SELFTEST_NORMAL;
LIS302DL_Init(&LIS302DL_InitStruct);
/* Set configuration of Internal High Pass Filter of LIS302DL*/
LIS302DL_InterruptConfigTypeDef LIS302DL_InterruptStruct;
LIS302DL_InterruptStruct.Latch_Request = LIS302DL_INTERRUPTREQUEST_LATCHED;
LIS302DL_InterruptStruct.SingleClick_Axes = LIS302DL_CLICKINTERRUPT_Z_ENABLE;
LIS302DL_InterruptStruct.DoubleClick_Axes = LIS302DL_DOUBLECLICKINTERRUPT_Z_ENABLE;
LIS302DL_InterruptConfig(&LIS302DL_InterruptStruct);
/* Required delay for the MEMS Accelerometre */
for
(idelay = 0; idelay < 5000000; idelay++){}
/* Configure Interrupt control register: enable Click interrupt1 */
ctrl = 0x07;
LIS302DL_Write(&ctrl, LIS302DL_CTRL_REG3_ADDR, 1);
/* Enable Interrupt generation on click/double click on Z axis */
ctrl = 0x70;
LIS302DL_Write(&ctrl, LIS302DL_CLICK_CFG_REG_ADDR, 1);
/* Configure Click Threshold on X/Y axis (10 x 0.5g) */
ctrl = 0xAA;
LIS302DL_Write(&ctrl, LIS302DL_CLICK_THSY_X_REG_ADDR, 1);
/* Configure Click Threshold on Z axis (10 x 0.5g) */
ctrl = 0x0A;
LIS302DL_Write(&ctrl, LIS302DL_CLICK_THSZ_REG_ADDR, 1);
/* Configure Time Limit */
ctrl = 0x03;
LIS302DL_Write(&ctrl, LIS302DL_CLICK_TIMELIMIT_REG_ADDR, 1);
/* Configure Latency */
ctrl = 0x7F;
LIS302DL_Write(&ctrl, LIS302DL_CLICK_LATENCY_REG_ADDR, 1);
/* Configure Click Window */
ctrl = 0x7F;
LIS302DL_Write(&ctrl, LIS302DL_CLICK_WINDOW_REG_ADDR, 1);
/* Read CLICK_CFG register */
LIS302DL_Read(&ctrl, LIS302DL_WHO_AM_I_ADDR, 1);
// After this read, ctrl always equal 0xFF
}
