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器件型号：MSP-EXP430G2ET 主题中讨论的其他器件：BOOST-DRV8711、DRV8711
工具与软件：
您好！
好的、我目前正在尝试 在 msp430G2 LaunchPad 和 BOOST-DRV8711之间建立 SPI 通信。 数据正从 msp430G2 (主器件)中发送、这是正确的、但当我尝试从 drv8711 IC (从器件)中读取数据时、不会读取任何数据。
您能回顾一下我的规范并指导我走向正确的方向吗？ 另外、如果您需要任何进一步的文档、请告诉我。
以下 是用于建立 SPI 通信的当前代码：
#include <msp430.h>
#include <stdint.h>
#define DUMMY 0x0000
#define SLAVE_CS_OUT P2OUT
#define SLAVE_CS_DIR P2DIR
#define SLAVE_CS_PIN BIT0
//*********************************
// General SPI State Machine*******
//*********************************
typedef enum SPI_ModeEnum{
IDLE_MODE,
TX_REG_ADDRESS_MODE,
RX_REG_ADDRESS_MODE,
TX_DATA_MODE,
RX_DATA_MODE,
TIMEOUT_MODE
} SPI_Mode;
/* Used to track the state of the software state machine*/
SPI_Mode MasterMode = IDLE_MODE;
uint8_t SendUCA0Data(uint8_t val) {
while (!(IFG2 & UCA0TXIFG)); // Wait for TX buffer readiness
UCA0TXBUF = val; // Send the data byte
while (!(IFG2 & UCA0RXIFG)); // Wait for RX buffer to fill
return UCA0RXBUF; // Return received data byte
}
SPI_Mode DRV8711_Write(uint8_t reg_addr, uint16_t data){
MasterMode = TX_REG_ADDRESS_MODE;
uint16_t command = (0 << 15) | ((reg_addr & 0x07) << 12) | (data & 0x0FFF); // Construct 16-bit command
SLAVE_CS_OUT |= SLAVE_CS_PIN; // Activate the slave (CS high)
SendUCA0Data((command >> 8) & 0xFF); // Send upper 8 bits
SendUCA0Data(command & 0xFF); // Send lower 8 bits
//__bis_SR_register(CPUOFF + GIE); // Enter LPM0 w/ interrupts
SLAVE_CS_OUT &= ~SLAVE_CS_PIN; // Deactivate the slave (CS low)
return MasterMode;
}
uint16_t DRV8711_Read(uint8_t reg_addr) {
uint16_t command = (1 << 15) | ((reg_addr & 0x07) << 12); // Construct 16-bit command for read
uint16_t received_data = 0;
SLAVE_CS_OUT |= SLAVE_CS_PIN; // Activate the slave (CS high)
// Send the command (Read request)
SendUCA0Data((command >> 8) & 0xFF); // Send upper 8 bits
SendUCA0Data(command & 0xFF); // Send lower 8 bits
// Receive the data
received_data = ((uint16_t)SendUCA0Data(DUMMY) << 8); // Send dummy and receive upper 8 bits
received_data |= SendUCA0Data(DUMMY); // Send dummy and receive lower 8 bits
SLAVE_CS_OUT &= ~SLAVE_CS_PIN; // deactivate the slave (CS low)
return received_data & 0x0FFF; // Return only the 12 data bits
}
//*******************************
// Device Initialization ********
//*******************************
// calibrating the clock to 16MHz
void initClockTo16MHz()
{
if (CALBC1_16MHZ==0xFF) // If calibration constant erased
{
while(1); // do not load, trap CPU!!
}
DCOCTL = 0; // Select lowest DCOx and MODx settings
BCSCTL1 = CALBC1_16MHZ; // Set DCO
DCOCTL = CALDCO_16MHZ;
}
void initGPIO() {
// Configure GPIO for SPI
P1SEL = BIT1 + BIT2 + BIT4; // Assign SPI pins
P1SEL2 = BIT1 + BIT2 + BIT4; // pins 1.1(MISO), 1.2(MOSI), and 1.4(CLK)
// Configure chip select pin
SLAVE_CS_DIR |= SLAVE_CS_PIN; // GPIO pin 2.0 is CS
SLAVE_CS_OUT &= ~SLAVE_CS_PIN; // CS low by default
}
void initSPI() {
UCA0CTL0 |= UCCKPL + UCMSB + UCMST + UCSYNC; // SPI master, MSB first, synchronous
UCA0CTL1 |= UCSSEL_2; // Use SMCLK
UCA0BR0 = 0x03; // SPI clock divider ~ 5.3MHz
UCA0BR1 = 0;
UCA0MCTL = 0; // No modulation must be cleared for SPI
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
}
//*****************************
// Main ***********************
// Sends messages *************
//*****************************
int main(void) {
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
initClockTo16MHz(); // calibrate clock to 16MHz
initGPIO(); // initiate the GPIO pins
initSPI(); // initiate SPI commands
//Write to a DRV8711 register
uint8_t reg_addr = 0x00; // register 0x00
uint16_t write_data = 0xC39; //data transmitted
DRV8711_Write(reg_addr, write_data);
reg_addr = 0x01; // register 0x01
write_data = 0xA13; // data transmitted
DRV8711_Write(reg_addr, write_data);
//Read from a DRV8711 register
uint8_t reg_addr = 0x07; // register 0x07
uint16_t read_data = DRV8711_Read(reg_addr);
}
