Trying to use LIS302DL embedded on STM32F4discovery, I'm writing a code but it doesn't work.
That is, I wrote the following code and I execute "int hoge = Accel_Read(LIS302DL_ADDRESS_WHOAMI);" in the main function after calling config_SPI(), but Accel_Read() does not return 0x3b, which is a response of "who am I" described in the datasheet.
I checked outputs of PA5,PA6,PA7 using an oscilloscope.
PA5( SCK Pin ) takes always low voltage and hence I'm guessing initializing SPI feature is not fine.
Could you point out me which part is not fine?
I'm really in trouble...
Code: Select all
#include <stm32f4xx.h>
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_rcc.h>
#include <stm32f4xx_spi.h>
//STM32F4---LIS-302DL connection
//PA5---14 SCL/SPC SPC=SPI Serial Port Clock
//PA6---12 SDO SDO=SPI Serial Data Output
//PA7---13 SDA/SDI/SDO SDI=SPI Serial Data Input
//PE0--- 8 INT1 INT1=Intertial interrupt 1
//PE1--- 9 INT2 INT2=Intertial interrupt 2
//PE3--- 7 CS_I2C/SPI CS=SPI enable
//Pin-feauture on STM32F4discovery
//PA5---SPI1_SCK
//PA6---SPI1_MISO
//PA7---SPI1_MOSI
#define SPI1_NSS_Pin GPIO_Pin_3 //GPIOE
#define SPI1_SCK_Pin GPIO_Pin_5 //GPIOA
#define SPI1_MISO_Pin GPIO_Pin_6 //GPIOA
#define SPI1_MOSI_Pin GPIO_Pin_7 //GPIOA
//LIS302DL address
#define LIS302DL_ADDRESS_WHOAMI 0x0f
#define LIS302DL_ADDRESS_OUTX 0x29
#define LIS302DL_ADDRESS_OUTY 0x2B
#define LIS302DL_ADDRESS_OUTZ 0x2D
uint8_t SPI_Send(uint8_t Data)
{
uint16_t RxData;
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET); // wait until transmit complete
SPI_I2S_SendData(SPI1, Data); // write data to be transmitted to the SPI data register
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); // wait until receive complete
RxData = SPI_I2S_ReceiveData(SPI1); // return received data from SPI data register
return (uint8_t)RxData;
}
void SPI_Select()
{
GPIO_ResetBits(GPIOE,SPI1_NSS_Pin);
}
void SPI_Deselect()
{
GPIO_SetBits(GPIOE,SPI1_NSS_Pin);
}
void Accel_Write(uint8_t add, uint8_t val)
{
SPI_Select();
uint8_t RxData;
RxData = SPI_Send(0b10000000 | add);
RxData = SPI_Send(val);
SPI_Deselect();
}
uint8_t Accel_Read(uint8_t add)
{
SPI_Select();
uint8_t RxData;
RxData = SPI_Send(0b00000000 | add);
RxData = SPI_Send(0x0);
SPI_Deselect();
return RxData;
}
//SPIinit
void config_SPI(){
//clock enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
//GPIO configure
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = SPI1_SCK_Pin | SPI1_MISO_Pin | SPI1_MOSI_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = SPI1_NSS_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);
SPI_Deselect();
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* SPI1 configuration */
SPI_InitTypeDef SPI_InitStructure;
SPI_I2S_DeInit(SPI1);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft | SPI_NSSInternalSoft_Set;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}