请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
器件型号：LP-MSP430FR2476 您好！
由于某种原因、我对 MAX17841唤醒序列的结果有了很大的改进、目前只有一个 MAX17853连接到 MAX17841即可观察到这一点。 以前、我可以使用 Maxim 评估 GUI 与连接到 MAX17841的两个 MAX17853通信。
来自 MSP 430的所有 SPI 事务在范围上看起来都是准确的、包括来自 MAX17853的响应。 但在唤醒结束时、来自 MAX17841的 INT'输入不会触发。 我很感谢有人提出这种情况的原因。 启用不同的接收中断标志并不会产生不同的效果(事务2)。
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <driverlib.h>
#include <msp430.h>
#include "clock~.h" // Clock configurations
static uint8_t TXData = 0; //transaction count
static uint8_t RXData = 0; //SPI receive byte
typedef struct {
uint8_t Len;
uint8_t Data[5];
} spi_MaximTrans_t;
static spi_MaximTrans_t DCInit_transactions[15];
uint8_t SPI_TX_index = 0; //byte count in transaction
/**
* Initialize system clocks
*/
static void init_clock(void) {
// Configure one FRAM waitstate as required by the device datasheet for MCLK
// operation beyond 8MHz _before_ configuring the clock system.
FRAMCtl_configureWaitStateControl(FRAMCTL_ACCESS_TIME_CYCLES_1);
//Set DCO FLL reference = REFO
CS_initClockSignal(CS_FLLREF, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_1);
//Set ACLK = REFO
CS_initClockSignal(CS_ACLK, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_1);
CS_initFLLParam param = {0};
//Set Ratio/Desired MCLK Frequency, initialize DCO, save trim values
CS_initFLLCalculateTrim(CS_MCLK_DESIRED_FREQUENCY_IN_KHZ, CS_MCLK_FLLREF_RATIO, ¶m);
//Set MCLK = REFO
CS_initClockSignal(CS_MCLK, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_1);
//Set SMCLK = DCO
CS_initClockSignal(CS_SMCLK, CS_DCOCLKDIV_SELECT, CS_CLOCK_DIVIDER_1);
//Clear all OSC fault flag
CS_clearAllOscFlagsWithTimeout(1000);
}
/**
* Initialize all of the IO pins per their configuration
*/
static void init_gpio(void) {
// Set all GPIO pins to output low to prevent floating input and reduce power consumption
GPIO_setOutputLowOnPin(GPIO_PORT_P1, GPIO_PIN_ALL8);
GPIO_setOutputLowOnPin(GPIO_PORT_P2, GPIO_PIN_ALL8);
GPIO_setOutputLowOnPin(GPIO_PORT_P3, GPIO_PIN_ALL8);
GPIO_setOutputLowOnPin(GPIO_PORT_P4, GPIO_PIN_ALL8);
GPIO_setOutputLowOnPin(GPIO_PORT_P5, GPIO_PIN_ALL8);
GPIO_setOutputLowOnPin(GPIO_PORT_P6, GPIO_PIN0 | GPIO_PIN1 | GPIO_PIN2);
GPIO_setAsOutputPin( GPIO_PORT_P1, GPIO_PIN_ALL8);
GPIO_setAsOutputPin( GPIO_PORT_P2, GPIO_PIN_ALL8);
GPIO_setAsOutputPin( GPIO_PORT_P3, GPIO_PIN_ALL8);
GPIO_setAsOutputPin( GPIO_PORT_P4, GPIO_PIN_ALL8);
GPIO_setAsOutputPin( GPIO_PORT_P5, GPIO_PIN_ALL8);
GPIO_setAsOutputPin( GPIO_PORT_P6, GPIO_PIN0 | GPIO_PIN1 | GPIO_PIN2);
}
/*
* Initialize the SPI peripheral on EUSCI A1
*/
void init_spi_peripheral()
{
//Initialize Master
EUSCI_A_SPI_initMasterParam param = {0};
param.selectClockSource = EUSCI_A_SPI_CLOCKSOURCE_SMCLK;
param.clockSourceFrequency = CS_getSMCLK();
param.desiredSpiClock = 1000000;
param.msbFirst = UCMSB;
param.clockPhase = EUSCI_A_SPI_PHASE_DATA_CAPTURED_ONFIRST_CHANGED_ON_NEXT;
param.clockPolarity = EUSCI_A_SPI_CLOCKPOLARITY_INACTIVITY_LOW;
param.spiMode = EUSCI_A_SPI_3PIN;
EUSCI_A_SPI_initMaster(EUSCI_A1_BASE, ¶m);
EUSCI_A_SPI_enable(EUSCI_A1_BASE);
}
void SetUpTransactions(void){ //All transactions padded to 4 bytes
//Enable keep alive mode
DCInit_transactions[0].Len = 2;
DCInit_transactions[0].Data[0] = 0x10;
DCInit_transactions[0].Data[1] = 0x5;
DCInit_transactions[1].Len = 2;
DCInit_transactions[1].Data[0] = 0x11;
DCInit_transactions[1].Data[1] = 0x0; //Read Transaction 1 byte
//Enable Rx Interrupt flags
DCInit_transactions[2].Len = 2;
DCInit_transactions[2].Data[0] = 0x4;
DCInit_transactions[2].Data[1] = 0x89; //No Receive
DCInit_transactions[3].Len = 2;
DCInit_transactions[3].Data[0] = 0x5;
DCInit_transactions[3].Data[1] = 0x0; //Read Transaction 2 byte
//Clear receive buffer
DCInit_transactions[4].Len = 1;
DCInit_transactions[4].Data[0] = 0xe0; //No Receive
//Wakeup UART slave devices
DCInit_transactions[5].Len = 2;
DCInit_transactions[5].Data[0] = 0x0e;
DCInit_transactions[5].Data[1] = 0x30;
//No Receive
//2ms delay for each slave to wake up
DCInit_transactions[6].Len = 2;
DCInit_transactions[6].Data[0] = 0x0f;
DCInit_transactions[6].Data[1] = 0x0; //Read Transaction 4 byte
//Wait for all UART slave devices to wake up
DCInit_transactions[7].Len = 2;
DCInit_transactions[7].Data[0] = 0x01;
DCInit_transactions[7].Data[1] = 0x0;
//Receive of 0x21 expected
//End of UART slave device wake-up period
DCInit_transactions[8].Len = 2;
DCInit_transactions[8].Data[0] = 0x0e;
DCInit_transactions[8].Data[1] = 0x10;
DCInit_transactions[9].Len = 2;
DCInit_transactions[9].Data[0] = 0x0f;
DCInit_transactions[9].Data[1] = 0x0; //Read Transaction 5 byte
//No Receive
//2ms delay for each slave to report null message
//Wait for null message to be received
DCInit_transactions[10].Len = 2;
DCInit_transactions[10].Data[0] = 0x01;
DCInit_transactions[10].Data[1] = 0x0;
//Receive 0x10 or 0x12
//Clear transmit buffer
DCInit_transactions[11].Len = 1;
DCInit_transactions[11].Data[0] = 0x20;
//No Receive
//Clear receive buffer
DCInit_transactions[12].Len = 1;
DCInit_transactions[12].Data[0] = 0xe0;
//No Receive
}
/**
* main.c
*/
int main(void)
{
static uint8_t noReceive = 0;
static uint8_t noInc = 0;
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
init_clock();
init_gpio(); // Set up IO pins
GPIO_setOutputHighOnPin(GPIO_PORT_P3, GPIO_PIN1);
// Configure SPI Pins for UCA1CLK, UCA1TXD/UCA1SIMO and UCA1RXD/UCA1SOMI
/*
* Select Port 2
* Set Pin 4, Pin 5 and Pin 6 to input Secondary Module Function
*/
GPIO_setAsPeripheralModuleFunctionInputPin(
GPIO_PORT_P2,
GPIO_PIN4 + GPIO_PIN5 + GPIO_PIN6,
GPIO_PRIMARY_MODULE_FUNCTION
);
// Set P1.0 to output direction
GPIO_setAsOutputPin (GPIO_PORT_P1, GPIO_PIN0);
GPIO_setAsInputPinWithPullUpResistor (GPIO_PORT_P4, GPIO_PIN2);
GPIO_enableInterrupt (GPIO_PORT_P4, GPIO_PIN2);
GPIO_selectInterruptEdge (GPIO_PORT_P4, GPIO_PIN2, GPIO_HIGH_TO_LOW_TRANSITION);
GPIO_clearInterrupt (GPIO_PORT_P4, GPIO_PIN2);
GPIO_setAsOutputPin (GPIO_PORT_P6, GPIO_PIN2);
PMM_unlockLPM5();
SetUpTransactions();
TXData = 0x0; // Holds transaction number
// Setup peripheral(s) now that gpio and clocks are setup
init_spi_peripheral(); // Init Maxim spi peripheral
GPIO_setOutputHighOnPin (GPIO_PORT_P6, GPIO_PIN2); //SHDNL held high for 4ms to ensure all slaves are powered on
__delay_cycles(64000);
while (TXData < 13){
noInc = 0;
GPIO_setOutputLowOnPin(GPIO_PORT_P3, GPIO_PIN1); //Maxim chip select low
__delay_cycles(1000); //idle time between CS change
for(SPI_TX_index = 0; SPI_TX_index < DCInit_transactions[TXData].Len; SPI_TX_index++){
while(!(UCA1IFG & UCTXIFG));
UCA1TXBUF = DCInit_transactions[TXData].Data[SPI_TX_index];
while (!(UCA1IFG & UCRXIFG));
RXData = UCA1RXBUF;
}
if ((TXData == 6) || (TXData == 9))
__delay_cycles(64000); //wait for slaves to wake up
if (TXData == 7){
if (RXData == 0x21){
TXData++;
noReceive = 0;
noInc = 1;
}
if (RXData != 0x21){
TXData = 7;
noReceive = 1;
}
}
if (TXData == 10){
if ((RXData == 0x10) || (RXData == 0x12)){
TXData++;
noReceive = 0;
noInc = 1;
}
else{
TXData = 10;
noReceive = 1;
}
}
if (!noReceive && !noInc){
TXData++;
}
if (TXData < 13){
GPIO_setOutputHighOnPin(GPIO_PORT_P3, GPIO_PIN1); //Maxim chip select high
__delay_cycles(1000); //idle time between CS change
}
}
}
//******************************************************************************
//
//This is the PORT2_VECTOR interrupt vector service routine
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=PORT4_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(PORT2_VECTOR)))
#endif
void P4_ISR (void)
{
// GPIO_setOutputHighOnPin(GPIO_PORT_P3, GPIO_PIN1);
GPIO_clearInterrupt (GPIO_PORT_P4, GPIO_PIN2);
// Toggle P1.0 output
GPIO_toggleOutputOnPin (GPIO_PORT_P1, GPIO_PIN0);
GPIO_disableInterrupt (GPIO_PORT_P4, GPIO_PIN2);
GPIO_setOutputHighOnPin(GPIO_PORT_P3, GPIO_PIN1); //Maxim chip select high
}
