本文将针对STML152的IAP移植过程作一个笔记。 首先得下载AN3310的示例代码,下载完成后,我们需要做些修改,我们将在NUCLEO-L152RE板子上进行验证测试。 由于NUCLEO-L152RE板子默认MCU是没有外挂晶振的,但可以通过ByPass方式使用ST-LInk的8M晶振,但这里只是作为IAP,且只需要使用到串口,因此可以只使用HSI,于是,在AN3310的工程中打开system_STM32l1xx.c文件找到SystemInit函数,注释掉//SetSysClock();,让系统使用默认的HSI即可。 [cpp] view plain copy
- void SystemInit (void)
- {
- /*!< Set MSION bit */
- RCC->CR |= (uint32_t)0x00000100;
-
- /*!< Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], MCOSEL[2:0] and MCOPRE[2:0] bits */
- RCC->CFGR &= (uint32_t)0x88FFC00C;
-
- /*!< Reset HSION, HSEON, CSSON and PLLON bits */
- RCC->CR &= (uint32_t)0xEEFEFFFE;
-
- /*!< Reset HSEBYP bit */
- RCC->CR &= (uint32_t)0xFFFBFFFF;
-
- /*!< Reset PLLSRC, PLLMUL[3:0] and PLLDIV[1:0] bits */
- RCC->CFGR &= (uint32_t)0xFF02FFFF;
-
- /*!< Disable all interrupts */
- RCC->CIR = 0x00000000;
-
- #ifdef DATA_IN_ExtSRAM
- SystemInit_ExtMemCtl();
- #endif /* DATA_IN_ExtSRAM */
-
- /* Configure the System clock frequency, AHB/APBx prescalers and Flash settings */
- //SetSysClock();
-
- #ifdef VECT_TAB_SRAM
- SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
- #else
- SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
- #endif
- }
然后修改man.c文件中的main函数,注释掉一些按键,让程序默认进入到升级模式: [cpp] view plain copy
- int main(void)
- {
- /* Unlock the Flash Program Erase controller */
- FLASH_If_Init();
-
- /* Initialize Key Button mounted on STM32L15xx-EVAL board */
- //STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_GPIO);
-
- /* Test if Key push-button on STM32L15xx-EVAL Board is pressed */
- //if (STM_EVAL_PBGetState(BUTTON_KEY) != 0x00)
- {
- /* Execute the IAP driver in order to reprogram the Flash */
- IAP_Init();
- /* Display main menu */
- Main_Menu ();
- }
- #if 0
- /* Keep the user application running */
- else
- {
- /* Test if user code is programmed starting from address "APPLICATION_ADDRESS" */
- if (((*(__IO uint32_t*)APPLICATION_ADDRESS) & 0x2FFE0000 ) == 0x20000000)
- {
- /* Jump to user application */
- JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
- Jump_To_Application = (pFunction) JumpAddress;
- /* Initialize user application's Stack Pointer */
- __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
- Jump_To_Application();
- }
- }
- #endif
- while (1)
- {}
- }
由于NUCLEO板子默认使用的是USART2,因此需要修改使用的串口: [cpp] view plain copy
- void IAP_Init(void)
- {
- USART_InitTypeDef USART_InitStructure;
- /* USART resources configuration (Clock, GPIO pins and USART registers) ----*/
- /* USART configured as follow:
- - BaudRate = 115200 baud
- - Word Length = 8 Bits
- - One Stop Bit
- - No parity
- - Hardware flow control disabled (RTS and CTS signals)
- - Receive and transmit enabled
- */
- USART_InitStructure.USART_BaudRate = 115200;
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No;
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
-
- //STM_EVAL_COMInit(COM2, &USART_InitStructure);
- USART2_Init(&USART_InitStructure);
- }
USART2_Init()函数为新添加的串口初始化函数,其定义如下: [cpp] view plain copy
- void USART2_Init(USART_InitTypeDef* USART_InitStruct)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
-
- /* Enable GPIO clock */
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
-
- /* Enable UART clock */
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
-
- /* Connect PXx to USARTx_Tx */
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
-
- /* Connect PXx to USARTx_Rx */
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
-
- /* Configure USART Tx as alternate function push-pull */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- /* Configure USART Rx as alternate function push-pull */
- //GPIO_InitStructure.GPIO_Pin = COM_RX_PIN[COM];
- //GPIO_Init(COM_RX_PORT[COM], &GPIO_InitStructure);
-
- /* USART configuration */
- USART_Init(USART2, USART_InitStruct);
-
- /* Enable USART */
- USART_Cmd(USART2, ENABLE);
- }
接下来需要修改程序中使用到的打印函数: [cpp] view plain copy
- void SerialPutChar(uint8_t c)
- {
- USART_SendData(USART2, c);
- while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)
- {
- }
- }
[cpp] view plain copy
- uint32_t SerialKeyPressed(uint8_t *key)
- {
-
- if ( USART_GetFlagStatus(USART2, USART_FLAG_RXNE) != RESET)
- {
- *key = (uint8_t)USART2->DR;
- return 1;
- }
- else
- {
- return 0;
- }
- }
基本上就移植好了,编译烧录进NUCLEO板中运行。
接下来需要找一个PC端软件超级终端。 除了IAP程序,我们还得准备APP程序,由于IAP支持烧录的是BIN文件,因此,我们得生成BIN文件,HEX是不行的。 在APP工程中我们得注意几项内容,以IAR为例: 1 在option->Linker下: config->Edit..--->Vector Table 的起始地址改为:0x08003000 ---->Memory Regions->ROM改为:0x08003000
2 option->Output Converter->修改生成BIN文件
3 sysytem_stm32l1xx.c文件下 找到宏定义 #define VECT_TAB_OFFSET 0x3000 偏移位置必须改为0x3000 到此基本可以了,APP就这样。
最后就是测试了。
测试: 首先得将IAP烧录进MCU,然后再通过IAP烧录APP。 通过IAP烧录APP过程如下: 打开超级终端,连接上串口,有如下界面: 波特率:115200 data bis:8 parity:none stop bits:1 Flow control:none 通过键盘输入1: 从菜单transfer->Send file打开如下界面,输入APP的BIN文件路径,并使用Ymodem传输协议,如下图: 点击Send,开始烧录。。。 传输结束后,按下3,运行APP程序,至此,整个IAP与APP都可以正常工作了。
结束语: 这个只是个示例,实际IAP是还需要修改的,得判断是进行升级模式还是直接跳过进入APP,这个就需要看设计如何了。 嵌入式学习交流群:561213221
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