Posted on September 21, 2016 at 21:29
Hi, I started to work on SPI, my intention is to read three gyroscope sensor by SPI bus,
Currently I testing SPI preipheral of my STM32 Discovery Board (STM32F407), this board has the sensor LIS302DL , when i read the ''WHo am I'' register I received 0x3F but it should be 0x7B, even more when I read continuously this register it got 0x3F,0x3F,
0x3F and more then i receive 0xFF,0xFF and several times and basicaly i receive groups of 0x3F and groups of 0xFF, other register read correctly the default values but it still appear 0xFFs.
I used some code I found in this forum, here below part of the code
#include ''stm32f4xx.h''
#include ''stdint.h''
#include <
stdio.h
>
#define Rst_NSS1 GPIO_ResetBits(GPIOE,GPIO_Pin_3)
#define Set_NSS1 GPIO_SetBits(GPIOE,GPIO_Pin_3)
/*More codes*/
static void SystemClock_Config(void)
{
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);
if(RCC_WaitForHSEStartUp()){
RCC_PLLConfig(RCC_PLLSource_HSE,PLL_M,PLL_N,8,PLL_Q);
RCC_PLLCmd(ENABLE);
while(SET != RCC_GetFlagStatus(RCC_FLAG_PLLRDY));
//Delay(900);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
RCC_HCLKConfig(RCC_SYSCLK_Div1); //AHB clock = SYSCLK (168MHz)
RCC_PCLK1Config(RCC_HCLK_Div4); //APB1 clock = HCLK/4
RCC_PCLK2Config(RCC_HCLK_Div16); //APB2 clock = HCLK/16
RCC_GetClocksFreq(&Clocks);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_DMA2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 | RCC_APB2Periph_ADC3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);// for USART1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);// for SPI1
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);// for SPI2
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE);// for SPI3
//RCC_MCO1Config(RCC_MCO1Source_HSE,RCC_MCO1Div_1);
//RCC_MCO2Config(RCC_MCO2Source_PLLCLK,RCC_MCO2Div_1);
}
}
void Init_SPI1(void){
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_Init(SPI1,&SPI_InitStructure);
SPI_TIModeCmd(SPI1,DISABLE);
SPI_Cmd(SPI1,ENABLE);
SPI_CalculateCRC(SPI1, DISABLE);
void Init_GPIO(void){
/* SPI1 */
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_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; //(SCK|MISO|MOSI)
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //(NSS : customized)
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOE, &GPIO_InitStructure);
}
uint32_t Registro,i;
uint16_t tempo;
uint16_t ReadSPI = 0x7F;
uint16_t WriteSPI = 0x7F;
uint16_t Addr = 0x80;
#define RdAddrPlus(MemAdd) ((0x80 | MemAdd) | 0x40)
#define RdAddr(MemAdd) ((0x80 | MemAdd) & 0xBF)
#define WrAddrPlus(MemAdd) ((0x7F & MemAdd) | 0x40)
#define WrAddr(MemAdd) (0x7F & MemAdd & 0xBF)
uint16_t SPI_SendByte(uint16_t DataSpi)
{
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == 0){} //wait for transmit buffer to not be empty (ie data loaded in)
//USART_puts(USART1,''SPI bus Free\n\r'');
SPI_I2S_SendData(SPI1,DataSpi);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == 0){} //wait for transmit buffer to not be empty (ie data loaded in)
return(SPI_I2S_ReceiveData(SPI1)); // Clear out any pending RX data
}
int main()
{
SystemCoreClockUpdate();
SystemClock_Config();
if (SysTick_Config(SystemCoreClock / 168000)) { /* SysTick 1 msec interrupts */
while (1); /* Capture error */
}
Init_GPIO();
Init_USART1();
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // enable the USART1 receive interrupt
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USART1, ENABLE); // enable USART1
USART_puts(USART1,''INICIO:D \n \r'');
NVIC_Configuration();
Init_SPI1();
/* SPI */
Rst_NSS1;
//Set_NSS1;
Delay(10);
//SPI_SendByte(RdAddr(0x0F));
while(1){
SPI_SendByte(RdAddr(0x20));
tempo = SPI_SendByte(RdAddr(0x00));
sprintf(texto,''SPI1 DR: %x \n\r'',tempo);
USART_puts(USART1,texto);
}
return 0;
}
I hope someone can help me with this
thanks in advance
#device #stm32f4 #stm32f4 #discovery #discovery #spi #spi #device
________________
Attachments : SPI_test.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I1AZ&d=%2Fa%2F0X0000000bjw%2Fm_vr0bNO1xDrNLX9Ir7Q3ZZqocyXUZu7S3SO2WaAkGo&asPdf=false
