Other Parts Discussed in Thread: ADS1298R
Hi,
I am trying to obtain converted data by writing to the config registers and a single channel of the ADS1298R. I have interfaced the PDK with an STM32F4 MCU. I am attaching the logic of my code below.
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//definitions//
uint8_t START = 0x08; // START OPCODE
uint8_t RX_RDATA[3]; //ARRAY TO STORE RECEIVED DATA
uint8_t RDATA=0x12; //RDATA OPCODE
uint8_t TXBUFFER1[3]={0x41, 0x00, 0xC6}; //VALUES TO BE WRITTEN TO CONFIG1 REG
uint8_t TXBUFFER2[3]={0x42, 0x00, 0x10}; //VALUES TO BE WRITTEN TO CONFIG2 REG
uint8_t TXBUFFER3[3]={0x43, 0x00, 0xFC}; //VALUES TO BE WRITTEN TO CONFIG3 REG
uint8_t TXBUFFER4[3]={0x44, 0x00, 0x03}; //VALUES TO BE WRITTEN TO LOFF REG
uint8_t TXBUFFER5[3]= {0x45, 0x00, 0x03}; //VALUES TO BE WRITTEN TO CH1 REG
//MAIN//
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_9, GPIO_PIN_RESET); //START PIN PULLING LOW
HAL_Delay(1);
HAL_SPI_Transmit(&hspi2, TXBUFFER1, 3, 50); //TX CONFIG1 WRITE VALUE
HAL_SPI_Transmit(&hspi2, TXBUFFER2,3, 50); //TX CONFIG2 WRITE VALUE
HAL_SPI_Transmit(&hspi2, TXBUFFER3,3, 50); //TX CONFIG3 WRITE VALUE
HAL_SPI_Transmit(&hspi2, TXBUFFER4,3, 50); //TX LOFF REGISTER WRITE VALUE
HAL_SPI_Transmit(&hspi2, TXBUFFER5,3, 50); //TX CH1REG WRITE VALUE
HAL_Delay(1);
HAL_SPI_Transmit(&hspi2,&START,1, 50); //TX START OPCODE
//ISR DETECTING DRDY FALLING EDGE//
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
HAL_SPI_Transmit(&hspi2,&RDATA, 1, 50); //TX RDATA OPCODE
HAL_SPI_Receive(&hspi2,RX_RDATA, 3, 50); //RECEIVE DATA USING SPI
}
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I am getting a value of 0x71 on my receive buffer array (RX_RDATA). However since SPI size is 8-bit per receive, I am getting only 0x71 on all 3 bits of the array. How do I fix this? Will appreciate any help.
