Posted on May 17, 2011 at 13:03Hello Domen, I checked with the Circle OS code.
The resynchronization they are doing is aimed to restore communication with the sensor after pauses at breakpoints.
The initialization of GPIO and SPI is pretty similar to mine.
I am attaching my code with a slight hope that someone with the exeperience in SPI and LIS302DL could point at error.
Thanks.
Andrew
Code:
void GPIO_Configuration(void) {
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure SPI1 pins: SCK, MOSI ---------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7; //GPIO_Pin_6 |
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;//GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//GPIO_Mode_Out_PP;//GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure SPI1 pins: MISO ---------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//GPIO_Mode_Out_PP;//GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure SPI1 pins: SS ---------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
Code:
int main(void)
{
RCC_Configuration();
NVIC_Configuration();
GPIO_Configuration();
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_High; // SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//SPI_NSS_Soft; //SPI_NSS_Hard;//
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;//SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;//SPI_FirstBit_LSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
u16 request = 0x0F;//0x0F;//0x29; // OutX register
request |= 0x80; // RW bit =1 for reading
// request |= 0x40; // MS bit = 1 for address increment
// request <<= 8;
int i = 0;
int j = 0;
u16 buf[100]={0};
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
while(1)
{
//set low
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, request);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, 0);
//set high
GPIO_SetBits(GPIOA, GPIO_Pin_4);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
{
buf[i++] = SPI_I2S_ReceiveData(SPI1);
i%=100;
}
j++;
}
}
