MA35D1 RTP printf float問題

发表于 2024-5-13 20:38:39

管理员好，各位大神好。
手册中有提到M4具有浮点数的支援，我想要利用printf打印出float的数值，UART却没有办法显示该数值。
以下是我用Template测试的代码，想请问要如何正确打印出float值呢?

感谢回覆

#include <stdio.h>
#include "NuMicro.h"

void SYS_Init(void)
{

/* Enable UART module clock */
CLK_EnableModuleClock(UART16_MODULE);

/* Select UART module clock source as HXT and UART module clock divider as 1 */
CLK_SetModuleClock(UART16_MODULE, CLK_CLKSEL3_UART16SEL_HXT, CLK_CLKDIV3_UART16(1));

/* Set GPD multi-function pins for UART16 RXD and TXD */
SYS->GPD_MFPH &= ~(SYS_GPD_MFPH_PD10MFP_Msk | SYS_GPD_MFPH_PD11MFP_Msk);
SYS->GPD_MFPH |= SYS_GPD_MFPH_PD10MFP_UART16_RXD | SYS_GPD_MFPH_PD11MFP_UART16_TXD;

/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CyclesPerUs automatically. */
SystemCoreClockUpdate();
}

/* Main */
int main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();

/* Init System, IP clock and multi-function I/O. */
SYS_Init();

/* Init UART to 115200-8n1 for print message */
UART_Open(UART16, 115200);

float test = 1.5;
printf("test = %f\n", test);

return 0;
}