目錄

• 代碼實現
• 使相應工程支持打印浮點數
• 實驗結果

平臺：Code Composer Studio 10.3.1
MSP430F5529 LaunchPad? Development Kit
(MSP?EXP430F5529LP)

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代碼實現

重定向fputc(int ch, FILE *f)直接使用printf的方法只有字符串和%s打印正常，數字打印不出來
只好換成這個。
這個程序是我以前寫在STM32里的，現在移植過來，效果依然不錯。

#include <string.h> #include <stdarg.h> #include <stdio.h> void UART_printf(uint16_t baseAddress, const char *format,...) {uint32_t length;va_list args;uint32_t i;char TxBuffer[128] = {0};va_start(args, format);length = vsnprintf((char*)TxBuffer, sizeof(TxBuffer)+1, (char*)format, args);va_end(args);for(i = 0; i < length; i++)USCI_A_UART_transmitData(baseAddress, TxBuffer[i]); }

整個源文件如下

#include "driverlib.h"#define MCLK_IN_HZ 25000000#define delay_us(x) __delay_cycles((MCLK_IN_HZ/1000000*(x))) #define delay_ms(x) __delay_cycles((MCLK_IN_HZ/1000*(x)))#include <string.h> #include <stdarg.h> #include <stdio.h> void UART_printf(uint16_t baseAddress, const char *format,...) {uint32_t length;va_list args;uint32_t i;char TxBuffer[128] = {0};va_start(args, format);length = vsnprintf((char*)TxBuffer, sizeof(TxBuffer)+1, (char*)format, args);va_end(args);for(i = 0; i < length; i++)USCI_A_UART_transmitData(baseAddress, TxBuffer[i]); }void SystemClock_Init(void) {PMM_setVCore(PMM_CORE_LEVEL_3); //高主頻工作需要較高的核心電壓//XT1引腳復用GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5, GPIO_PIN4);GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P5, GPIO_PIN5);//起振XT1UCS_turnOnLFXT1(UCS_XT1_DRIVE_3,UCS_XCAP_3);//XT2引腳復用GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5, GPIO_PIN2);GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P5, GPIO_PIN3);//起振XT2UCS_turnOnXT2(UCS_XT2_DRIVE_4MHZ_8MHZ);//XT2作為FLL參考時鐘，先8分頻，再50倍頻 4MHz / 8 * 50 = 25MHzUCS_initClockSignal(UCS_FLLREF, UCS_XT2CLK_SELECT, UCS_CLOCK_DIVIDER_8);UCS_initFLLSettle(25000, 50);//XT1作為ACLK時鐘源 = 32768HzUCS_initClockSignal(UCS_ACLK, UCS_XT1CLK_SELECT, UCS_CLOCK_DIVIDER_1);//DCOCLK作為MCLK時鐘源 = 25MHzUCS_initClockSignal(UCS_MCLK, UCS_DCOCLK_SELECT, UCS_CLOCK_DIVIDER_1);//DCOCLK作為SMCLK時鐘源 = 25MHzUCS_initClockSignal(UCS_SMCLK, UCS_DCOCLK_SELECT, UCS_CLOCK_DIVIDER_1);//設置外部時鐘源的頻率，使得在調用UCS_getMCLK, UCS_getSMCLK 或 UCS_getACLK時可得到正確值UCS_setExternalClockSource(32768, 4000000); }bool UART_Init(uint16_t baseAddress, uint32_t Baudrate) {float UART_Temp = 0;USCI_A_UART_initParam huart = {0};if(baseAddress == USCI_A0_BASE) //P3.3, P3.4 = USCI_A0 TXD/RXD{GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P3, GPIO_PIN3);GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P3, GPIO_PIN4);}else if(baseAddress == USCI_A1_BASE) //P4.4, P4.5 = USCI_A1 TXD/RXD{GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P4, GPIO_PIN4);GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P4, GPIO_PIN5);}if(Baudrate <= 9600){huart.selectClockSource = USCI_A_UART_CLOCKSOURCE_ACLK;UART_Temp = (float)UCS_getACLK()/Baudrate;}else{huart.selectClockSource = USCI_A_UART_CLOCKSOURCE_SMCLK;UART_Temp = (float)UCS_getSMCLK()/Baudrate;}if(UART_Temp < 16)huart.overSampling = USCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;else{huart.overSampling = USCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION;UART_Temp /= 16;}huart.clockPrescalar = (int)UART_Temp;if(huart.overSampling == USCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION){huart.secondModReg = (int)((UART_Temp - huart.clockPrescalar) * 8);}else{huart.firstModReg = (int)((UART_Temp - huart.clockPrescalar) * 16);}huart.parity = USCI_A_UART_NO_PARITY;huart.msborLsbFirst = USCI_A_UART_LSB_FIRST;huart.numberofStopBits = USCI_A_UART_ONE_STOP_BIT;huart.uartMode = USCI_A_UART_MODE;if (STATUS_FAIL == USCI_A_UART_init(baseAddress, &huart)){return STATUS_FAIL;}//Enable UART module for operationUSCI_A_UART_enable(baseAddress);//Enable Receive InterruptUSCI_A_UART_clearInterrupt(baseAddress, USCI_A_UART_RECEIVE_INTERRUPT);USCI_A_UART_enableInterrupt(baseAddress, USCI_A_UART_RECEIVE_INTERRUPT);return STATUS_SUCCESS; }int main(void) {WDT_A_hold(WDT_A_BASE);SystemClock_Init();UART_Init(USCI_A1_BASE, 115200);//interrupts enabled__bis_SR_register(GIE);while(1){UART_printf(USCI_A1_BASE, "數字測試：%d，字符串測試：%s\r\n", 2333, "能收到就算成功");delay_ms(1000);} }//****************************************************************************** // //This is the USCI_A0 interrupt vector service routine. // //****************************************************************************** #pragma vector=USCI_A0_VECTOR __interrupt void USCI_A0_ISR (void) {uint8_t receivedData = 0;switch (__even_in_range(UCA0IV,4)){//Vector 2 - RXIFGcase 2:receivedData = USCI_A_UART_receiveData(USCI_A0_BASE);USCI_A_UART_transmitData(USCI_A0_BASE,receivedData);break;default:break;} }//****************************************************************************** // //This is the USCI_A1 interrupt vector service routine. // //****************************************************************************** #pragma vector=USCI_A1_VECTOR __interrupt void USCI_A1_ISR (void) {uint8_t receivedData = 0;switch (__even_in_range(UCA1IV,4)){//Vector 2 - RXIFGcase 2:receivedData = USCI_A_UART_receiveData(USCI_A1_BASE);USCI_A_UART_transmitData(USCI_A1_BASE,receivedData);break;default:break;} }

使相應工程支持打印浮點數

若需要打印浮點數，則需設置對應工程

將此處設為full即可

實驗結果

總結

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