stm32f4discovery

问题 I am using STM32f4 discovery board connected with xbee to receive temperature data from remote temperature sensor. Code used is CMIS UART example code. I will receive packet data, 1 byte at a time. In other words UART receive interrupt will be called whenever each byte receives. Once I gets the complete packet I will copy the temperature data. My UART callback function works without any issue. But after several hours, UART receive interrupt stops working and UART cannot receive anything.

问题 I've written this code to receive a series of char variable through USART6 and have them stored in a string. But the problem is first received value is just a junk! Any help would be appreciated in advance. while(1) { //memset(RxBuffer, 0, sizeof(RxBuffer)); i = 0; requestRead(&dt, 1); RxBuffer[i++] = dt; while (i < 11) { requestRead(&dt, 1); RxBuffer[i++] = dt; HAL_Delay(5); } function prototype static void requestRead(char *buffer, uint16_t length) { while (HAL_UART_Receive_IT(&huart6,

来源： https://stackoverflow.com/questions/34760507/how-to-setup-an-interrupt-driven-spi-with-stm32f4

问题 I'm creating a context switch program for a personal mini ARM kernel project and the context switch program is written entirely in Assembly. The problem is when I make a SVC call (svc 0) I enter the SVC_Handler but when I try to execute the next instruction I then enter a different handler ("UsageFault_Handler"). The fault occurs before I can pop any of the registers in the SVC_Handler. Here's a register dump of my gdb screen (right after I enter SVC_Handler and encounter UsageFault_Handler):

问题 I'm creating a context switch program for a personal mini ARM kernel project and the context switch program is written entirely in Assembly. The problem is when I make a SVC call (svc 0) I enter the SVC_Handler but when I try to execute the next instruction I then enter a different handler ("UsageFault_Handler"). The fault occurs before I can pop any of the registers in the SVC_Handler. Here's a register dump of my gdb screen (right after I enter SVC_Handler and encounter UsageFault_Handler):

问题 I'm creating a context switch program for a personal mini ARM kernel project and the context switch program is written entirely in Assembly. The problem is when I make a SVC call (svc 0) I enter the SVC_Handler but when I try to execute the next instruction I then enter a different handler ("UsageFault_Handler"). The fault occurs before I can pop any of the registers in the SVC_Handler. Here's a register dump of my gdb screen (right after I enter SVC_Handler and encounter UsageFault_Handler):

问题 So I'm using an STM32F407 and trying to write to an SD card with FATFS. I have used the CubeMX to generate the code for both the FAT layer and 4bit SDIO configuration software. I have added the following code to main to test whether the code works. UINT bw; f_mount(&FatFs, "", 0); /* Give a work area to the default drive */ /* Create a file */ if(f_open(&Fil, "newfile.txt", FA_WRITE | FA_CREATE_ALWAYS) == FR_OK) { f_write(&Fil, "It works!\r\n", 11, &bw); /* Write data to the file */ f_close(

问题 So I'm using an STM32F407 and trying to write to an SD card with FATFS. I have used the CubeMX to generate the code for both the FAT layer and 4bit SDIO configuration software. I have added the following code to main to test whether the code works. UINT bw; f_mount(&FatFs, "", 0); /* Give a work area to the default drive */ /* Create a file */ if(f_open(&Fil, "newfile.txt", FA_WRITE | FA_CREATE_ALWAYS) == FR_OK) { f_write(&Fil, "It works!\r\n", 11, &bw); /* Write data to the file */ f_close(

问题 So I'm using an STM32F407 and trying to write to an SD card with FATFS. I have used the CubeMX to generate the code for both the FAT layer and 4bit SDIO configuration software. I have added the following code to main to test whether the code works. UINT bw; f_mount(&FatFs, "", 0); /* Give a work area to the default drive */ /* Create a file */ if(f_open(&Fil, "newfile.txt", FA_WRITE | FA_CREATE_ALWAYS) == FR_OK) { f_write(&Fil, "It works!\r\n", 11, &bw); /* Write data to the file */ f_close(

问题 I'm using STM32F746ZG and FreeRTOS. The start address of flash is 0x08000000. But I want to change it to 0x08040000. I've searched this issue through google but I didn't find the solution. I changed the linker script like the following. MEMORY { RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 320K /* FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 1024K */ FLASH (rx) : ORIGIN = 0x8040000, LENGTH = 768K } If I only change it and run the debugger, it has the problem. If I change the VECT_TAB_OFFSET from