1. Waveforms for SCLK, CS, MOSI(DIN) are verified for data getting transferred.
2. As all adc input channels of ads1148-q1 can act as GPIO also, so configured AIN7 pin as gpio. Can able to turn ON/Off Led connected to pin AIN7 through program.
3. Code is as per pseudo code given in datasheet.
4. Can't able to get data on DOUT pin, what could be the reason? please help me with this, thanks in advance.
My code is as below:
int main(void)
{
uint8_t high_byte;
uint8_t low_byte;
uint16_t adc_data;
uint8_t data_ready;
uint8_t received_val = 0;
init_USART1(9600);
GPIO_config();
//Reset low to high
GPIO_ResetBits(GPIOC, GPIO_Pin_12); //RESET is Low
Delay_ms(10);
GPIO_SetBits(GPIOC, GPIO_Pin_12); //RESET is High
/************************** Steps ***************************/
Delay_ms(16);
init_SPI1(); //SPI Initialization
GPIOE->BSRRH |= GPIO_Pin_7; //set PE7 (CS) low
Delay_ms(16); //minimum delay of tcssc*/
SPI1_send(0x06); //RESET command
Delay_ms(1);
SPI1_send(0x16); //SDATAC Command
SPI1_send(0x40);
SPI1_send(0x0E);
SPI1_send(0x01); //MUX0
SPI1_send(0x00); //VBIAS
SPI1_send(0x30); //MUX1
SPI1_send(0x52); //SYS0
SPI1_send(0x00); //OFC0
SPI1_send(0x00); //OFC1
SPI1_send(0x00); //OFC2
SPI1_send(0x00); //FSC0
SPI1_send(0x00); //FSC1
SPI1_send(0x00); //FSC2
SPI1_send(0x06); //IDAC0
SPI1_send(0x89); //IDAC1
SPI1_send(0x80); //GPIOCFG
SPI1_send(0x00); //GPIODIR
SPI1_send(0x80); //GPIODAT
GPIOE->BSRRL |= GPIO_Pin_7; //set PE7 (CS) high
Delay_us(10);
//Read all registers
GPIOE->BSRRH |= GPIO_Pin_7; //set PE7 (CS) low
SPI1_send(0x20); //Read starting from address 0
SPI1_send(0x0E); //Read 0xE + 1 = 15 bytes
uint8_t MUX0 = SPI1_send(0xFF); //Read Mux0
uint8_t VBIAS = SPI1_send(0xFF);
uint8_t MUX1 = SPI1_send(0xFF);
uint8_t SYS0 = SPI1_send(0xFF);
uint8_t OFC0 = SPI1_send(0xFF);
uint8_t OFC1 = SPI1_send(0xFF);
uint8_t OFC2 = SPI1_send(0xFF);
uint8_t FSC0 = SPI1_send(0xFF);
uint8_t FSC1 = SPI1_send(0xFF);
uint8_t FSC2 = SPI1_send(0xFF);
uint8_t IDAC0 = SPI1_send(0xFF);
uint8_t IDAC1 = SPI1_send(0xFF);
uint8_t GPIOCFG = SPI1_send(0xFF);
uint8_t GPIODIR = SPI1_send(0xFF);
uint8_t GPIODAT = SPI1_send(0xFF);
GPIOE->BSRRL |= GPIO_Pin_7; //set PE7 (CS) high
GPIOE->BSRRH |= GPIO_Pin_7; //set PE7 (CS) low
SPI1_send(0x04); //SYNC Command
Delay_us(10); //delay >tsccs
//GPIO_ResetBits(GPIOC, GPIO_Pin_12); //RESET High
//Delay_ms(10);
while(1)
{
GPIO_SetBits(GPIOE, GPIO_Pin_14); //START is High
Delay_ms(10);
GPIO_ResetBits(GPIOE, GPIO_Pin_14); //START is Low
data_ready = 0x01;
Delay_ms(1);
while (data_ready == 0x01)
{
data_ready = GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_11);
}
GPIOE->BSRRH |= GPIO_Pin_7; //set PE7 (CS) low
Delay_ms(7);
SPI1_send(0x12); //RDATA Command
//Delay_ms(1);
high_byte = SPI1_send(0xFF);
low_byte = SPI1_send(0xFF);
/*SPI1_send(0xFF);
high_byte=SPI_I2S_ReceiveData(SPI1);
SPI1_send(0xFF);
low_byte=SPI_I2S_ReceiveData(SPI1);*/
Delay_ms(20);
GPIOE->BSRRL |= GPIO_Pin_7; //set PE7 (CS) high
adc_data = (((uint16_t) high_byte) << 8) | ((uint16_t) low_byte);
USART_SendData(USART1, adc_data);
}
while(1);
return 0;
}
