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器件型号：MSP-EXP430FR5994 主题中讨论的其他器件：BQ79600EVM、
我让 UART 环回示例以1Mbps 波特率工作、没有问题。 我在 UART 时钟上使用了4MHz SMCLK。 这些结果在 MSP430 EVM 上使用了一个永恒的时钟。
当与 BQ79600EVM 和自定义 BQ79616连接时、UART 接收中断会在我尝试执行单个器件读取命令后立即触发。 我可以看到 UCOE 标志被置1。 UART 驱动程序的设置/使用是否有问题？
我已经为 BQ79600芯片设置了一个100位延迟进行响应、因此 MSP430有时间从 UART 发送切换到 UART 接收。 MSP430是否有理想的数字来实现这一点？
在此设置中、我使用的是外部时钟。
#define BQUART EUSCI_A1_BASE
#define BQUART_DISABLE EUSCI_A_UART_disable
#define BQUART_CLOCKSOURCE EUSCI_A_UART_CLOCKSOURCE_SMCLK
#define BQUART_PARITY EUSCI_A_UART_NO_PARITY
#define BQUART_BITORDER EUSCI_A_UART_LSB_FIRST
#define BQUART_STOPBIT EUSCI_A_UART_ONE_STOP_BIT
#define BQUART_MODE EUSCI_A_UART_MODE
#define BQUART_OVERSAMPLING EUSCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION
#define BQUART_INIT EUSCI_A_UART_init
#define BQUART_initParam EUSCI_A_UART_initParam
#define BQUART_enable EUSCI_A_UART_enable
#define BQUART_disable EUSCI_A_UART_disable
#define BQUART_REG P2OUT
#define BQUART_TX_PORT GPIO_PORT_P2
#define BQUART_RX_PORT GPIO_PORT_P2
#define BQUART_RX_PIN GPIO_PIN6
#define BQUART_TX_PIN GPIO_PIN5
#define BQUART_SELECT_FUNCTION GPIO_SECONDARY_MODULE_FUNCTION
#define BQUART_enableInterrupt EUSCI_A_UART_enableInterrupt
#define BQUART_RX_INT EUSCI_A_UART_RECEIVE_INTERRUPT
#define BQUART_clearInterrupt EUSCI_A_UART_clearInterrupt
#define BQUART_TXBUF UCA1TXBUF
#define BQUART_RXBUF UCA1RXBUF
#define BQUART_ISR USCI_A1_ISR
#define BQUART_VECTOR USCI_A1_VECTOR
#define BQUART_IFG UCA1IFG
#define BQUART_IV UCA1IV
#define BQUART_BUSY (UCA1STATW&UCBUSY)
void Clock_Init()
{
#ifdef EXT_CLK
GPIO_setAsPeripheralModuleFunctionInputPin(
GPIO_PORT_PJ,
GPIO_PIN4 + GPIO_PIN5,
GPIO_PRIMARY_MODULE_FUNCTION
);
// Set PJ.6 and PJ.7 as Primary Module Function Input, HFXT.
GPIO_setAsPeripheralModuleFunctionInputPin(
GPIO_PORT_PJ,
GPIO_PIN6 + GPIO_PIN7,
GPIO_PRIMARY_MODULE_FUNCTION
);
// Check if one FRAM waitstate is needed for 5962, 5994 device as well!
FRAMCtl_A_configureWaitStateControl(FRAMCTL_A_ACCESS_TIME_CYCLES_1);
uint32_t u32ClockFrequencyCheck = 0u;
// JA - Enable lxft & HXFT
CS_setExternalClockSource(32768, 16000000);
CS_initClockSignal(CS_SMCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_4);
CS_initClockSignal(CS_MCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);
//Set ACLK=LFXT
CS_initClockSignal(CS_ACLK, CS_LFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);
//Set the appropriate drive values for each oscillator for the launchpad vs. actual schematic.
CS_turnOnLFXT(CS_LFXT_DRIVE_3);
// CS_turnOnLFXT(CS_LFXT_DRIVE_0);
CS_turnOnHFXT(CS_HFXT_DRIVE_16MHZ_24MHZ);
// JA - SMCLK appears to be running extremely slowly when sourced from HFXT
// JA - Check SMCLK, MCLK clock frequencies
u32ClockFrequencyCheck = CS_getMCLK();
u32ClockFrequencyCheck = CS_getSMCLK();
#endif
#ifdef DCO_CLK
// Configure one FRAM waitstate as required by the device datasheet for MCLK
// operation beyond 8MHz _before_ configuring the clock system.
FRCTL0 = FRCTLPW | NWAITS_1;
// Clock System Setup
CSCTL0_H = CSKEY_H; // Unlock CS registers
CSCTL1 = DCOFSEL_0; // Set DCO to 1MHz
// Set SMCLK = MCLK = DCO, ACLK = VLOCLK
CSCTL2 = SELA__VLOCLK | SELS__DCOCLK | SELM__DCOCLK;
// Per Device Errata set divider to 4 before changing frequency to
// prevent out of spec operation from overshoot transient
CSCTL3 = DIVA__4 | DIVS__4 | DIVM__4; // Set all corresponding clk sources to divide by 4 for errata
CSCTL1 = DCOFSEL_4 | DCORSEL; // Set DCO to 16MHz
// Delay by ~10us to let DCO settle. 60 cycles = 20 cycles buffer + (10us / (1/4MHz))
__delay_cycles(60);
CSCTL3 = DIVA__1 | DIVS__4 | DIVM__1; // SMCLK=2Mhz MCLK=16MHz
CSCTL0_H = 0; // Lock CS registers
#endif
}
void UART_Init(void){
GPIO_setAsPeripheralModuleFunctionInputPin(
BQUART_TX_PORT,
BQUART_TX_PIN + BQUART_RX_PIN,
BQUART_SELECT_FUNCTION
);
BQUART_initParam param = {0};
param.clockPrescalar = 4,
param.firstModReg = 0,
param.secondModReg = 0,
param.selectClockSource = BQUART_CLOCKSOURCE;
param.parity = BQUART_PARITY;
param.msborLsbFirst = BQUART_BITORDER;
param.numberofStopBits = BQUART_STOPBIT;
param.uartMode = BQUART_MODE;
param.overSampling = BQUART_OVERSAMPLING;
if(STATUS_FAIL == BQUART_INIT(BQUART, ¶m))
{
return;
}
BQUART_enable(BQUART);
BQUART_clearInterrupt(BQUART, BQUART_RX_INT);
BQUART_enableInterrupt(BQUART, BQUART_RX_INT);
}
void uartSend(int length, uint8_t * data){
uint8_t i;
for (i = 0; i < length; i++){
while (!(UCA1IFG & UCTXIFG));
BQUART_TXBUF = data[i];
}
}
void uartReceive(BYTE * data, BYTE length){
while (length > 0){
while (BQUART_BUSY);
*data = BQUART_RXBUF;
data++;
length--;
}
}
//******************************************************************************
// SPI_B1 Interrupt ************************************************************
//******************************************************************************
#pragma vector=BQUART_VECTOR
/*******************************************************************************
USCI_B1_ISR ******************************************************************
*******************************************************************************
* Function: B1 Interrupt Routine
********************************************************************************/
__interrupt void BQUART_ISR(void)
{
switch(__even_in_range(BQUART_IV, USCI_UART_UCTXCPTIFG))
{
case USCI_NONE: break;
case USCI_UART_UCRXIFG:
BQUART_IFG &= ~UCRXIFG;
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0 on reti
break;
case USCI_UART_UCTXIFG: break;
case USCI_UART_UCSTTIFG: break;
case USCI_UART_UCTXCPTIFG: break;
default: break;
}
}
#endif
