Posted on March 01, 2017 at 01:17Hello,
I'am using and STM32F103C8T6 development board to communicate via SPI with ADS1220(Analog to Digital Converter). My code needs to read the buffer of the ADS1220 at certain times. When i run the code the SPI works only for a few minutes(max 14 min) before it stops. The SPI code i am using is :
void SPIx_Init()
{
// Initialization struct
SPI_InitTypeDef SPI_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
// Step 1: Initialize SPI
RCC_APB2PeriphClockCmd(SPIx_RCC, ENABLE);
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
//SPI_InitStruct.SPI_NSS = SPI_NSS_Soft | SPI_NSSInternalSoft_Set;
SPI_Init(SPIx, &SPI_InitStruct);
SPI_Cmd(SPIx, ENABLE); // Enables SPIx peripheral.
// Step 2: Initialize GPIO
RCC_APB2PeriphClockCmd(SPI_GPIO_RCC, ENABLE);
// GPIO pins for MOSI and SCK
GPIO_InitStruct.GPIO_Pin = SPI_PIN_MOSI | SPI_PIN_SCK;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(SPI_GPIO, &GPIO_InitStruct);
// GPIO pins for MOSI, MISO
GPIO_InitStruct.GPIO_Pin = SPI_PIN_MISO;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(SPI_GPIO, &GPIO_InitStruct);
}
uint8_t SPIx_Receive(uint8_t data)
{
// Write data to be transmitted to the SPI data register
SPIx->DR = data;
// Wait until transmit complete
while (!(SPIx->SR & (SPI_I2S_FLAG_TXE)));
// Wait until receive complete
while (!(SPIx->SR & (SPI_I2S_FLAG_RXNE)));
// Wait until SPI is not busy anymore
while (SPIx->SR & (SPI_I2S_FLAG_BSY));
//Return received data from SPI data register
return SPIx->DR;
}
The program always stops at this line of code :
while (!(SPIx->SR & (SPI_I2S_FLAG_TXE)));
Before the code stops, it has done at least 1000 reads(usually more than a 1000,maybe even 50000) of the buffer successfully. Why does my code stop after successfully running for so long time. Is there a problem with the SPI buffer, some data not being send. The data I am transmitting is a dummy byte 0x00.
Any help would be greatly appreciated.
