我利用MSP432P401R與ADS1299進行溝通，我利用SPI讀取ADS1299連續數據，MSP432P401R為master，ADS1299為slave，在此之前我已成功利用MSP432P401R寫入和讀取暫存器，並且都成功，但是讀取連續數據卻有很大的問題。
以下為我目前遇到的幾個問題整理：
1.如果要讀取測試方波，並且我只需要使用一個通道，請問我的所有暫存器之值是否設定正確，通道1為內部測試訊號方波，其餘通道均無訊號。
2.讀取連續數據時，master是否需要連續傳送虛擬位元0x00至slave。
3.讀去連續數據時，每一個DRDY之間都會輸出一個stat+8個通道值，因為我只使用到1個通道，我要如何讓通道1的值和其餘通道分開。
4.我測試過讓通道1與其他通道值皆為0x61 Input shorted (for offset or noise measurements)，但結果顯示我的SPI好像沒有作用，無法接收到連續傳輸的數據，理論上應該所有數值皆為0，但結果卻有數值。
以下為我目前的程式碼
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>
/* Standard Includes */
#include <stdint.h>
#include <stdbool.h>
#define HZ 3000000UL
/* Statics */
static volatile uint8_t RXData = 0;
static uint8_t TXData = 0;
int i = 0;
int a = 0;
int z = 0;
int j = 0;
//#define A[500];
uint8_t A;
uint32_t B[1000];
//uint8_t A[500];
uint8_t hibyte,midbyte,lowbyte;
uint32_t intQA;
//![Simple SPI Config]
/* SPI Master Configuration Parameter */
const eUSCI_SPI_MasterConfig spiMasterConfig =
{
EUSCI_B_SPI_CLOCKSOURCE_SMCLK, // SMCLK Clock Source
3000000, // SMCLK = DCO = 3MHZ
500000, // *** = 500khz
EUSCI_B_SPI_MSB_FIRST, // MSB First
EUSCI_B_SPI_PHASE_DATA_CAPTURED_ONFIRST_CHANGED_ON_NEXT, // Phase
EUSCI_B_SPI_CLOCKPOLARITY_INACTIVITY_LOW, // LOW polarity
EUSCI_B_SPI_3PIN // 3Wire SPI Mode
};
//![Simple SPI Config]
int main(void)
{
/* Halting WDT */
WDT_A_holdTimer();
//![Simple SPI Example]
/* Selecting P1.5 P1.6 and P1.7 in SPI mode */
GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,
GPIO_PIN5 | GPIO_PIN6 | GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION);
/* Configuring SPI in 3wire master mode */
SPI_initMaster(EUSCI_B0_BASE, &spiMasterConfig);
/* Enable SPI module */
SPI_enableModule(EUSCI_B0_BASE);
/* Enabling interrupts */
//SPI_enableInterrupt(EUSCI_B0_BASE, EUSCI_B_SPI_RECEIVE_INTERRUPT);
//Interrupt_enableInterrupt(INT_EUSCIB0);
//Interrupt_enableSleepOnIsrExit();
//初始化ADS1299
P3->DIR |= BIT0;
P3->OUT ^= BIT0; //CS_Low
__delay_cycles(HZ);
P3->DIR |= BIT5;
P3->OUT = BIT5; //CLKSEL High
__delay_cycles(HZ/1000);
P5->DIR |= BIT1;
P5->OUT = BIT1; //PWDN High
__delay_cycles(HZ);
P2->DIR |= BIT7;
P2->OUT = BIT7; //RESET High
__delay_cycles(HZ);
P2->DIR |= BIT7;
P2->OUT ^= BIT7; //RESET LOW
__delay_cycles(HZ);
P2->DIR |= BIT7;
P2->OUT = BIT7; //RESET High
__delay_cycles(HZ);
///////////////////////////////////////////////////
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x11); //SDATAC
//CONFIG3
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x43); //CONFIG3
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00); //CONFIG3
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0xE0); //CONFIG3
//CONFIG1
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x41);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x96);//採樣率250
//CONFIG2
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x42);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0xD0);
//Channel1
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x45);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x65);
//SPI_transmitData(EUSCI_B0_BASE, 0x61);
//Channel2
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x46);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x61);
//Channel3
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x47);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x61);
//Channel4
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x48);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x61);
//Channel5
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x49);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x61);
//Channel6
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x4A);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x61);
//Channel7
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x4B);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x61);
//Channel8
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x4C);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x00);
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x61);
P2->DIR |= BIT6;
P2->OUT |= BIT6; //Set Start High
while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
SPI_transmitData(EUSCI_B0_BASE, 0x10); //RDATAC
for(i;i<1000;i++)
{
int32_t outputcode = adc_read_data();
B[a] = outputcode;
a++;
}
//PCM_gotoLPM0();
//__no_operation();
}
uint8_t read_continue_data(){
SPI_transmitData(EUSCI_B0_BASE, 0x00); //傳送虛擬位元0x00
A = SPI_receiveData(EUSCI_B0_BASE); //將接收到的資料存進A陣列
//return read_continue_data;
// return 0;
}
uint32_t adc_read_data(void)
{
uint8_t adcCode[3];
adcCode[0] = read_continue_data();
adcCode[1] = read_continue_data();
adcCode[2] = read_continue_data();
return ((int32_t)(((adcCode[0] & 0x80) ? (0x00) : (0xFF)) ) << 24) |
((adcCode[0] & 0xFF) << 16) |
((adcCode[1] & 0xFF) << 8 ) |
((adcCode[2] & 0xFF) << 0 ) ;
}
