247 lines
6.0 KiB
C
247 lines
6.0 KiB
C
#include "includes.h"
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#define DEBUG_PORT USART2
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// 系统TickCount
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volatile u32 Systick_TickCount = 0;
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// 启动原因代码
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volatile uint32_t SYS_RSTSTS = 0;
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// 实现stdout的硬件输出
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int stdout_putchar(int ch)
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{
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while(!(DEBUG_PORT->ISR & LL_USART_ISR_TXE));
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DEBUG_PORT->TDR = (uint8_t) ch;
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return ch;
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}
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u32 GetDelayTick(u32 ms)
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{
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return GetTickCount() + ms;
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}
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// 考虑了u32溢出翻转的情况
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u8 IsTickOut(u32 OutTick)
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{
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u32 tick = GetTickCount();
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if(tick > OutTick)
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{
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if(tick - OutTick > 0x80000000UL)
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return 0;
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return 1;
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}
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if(OutTick - tick > 0x80000000UL)
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return 1;
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return 0;
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}
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// 这个函数必须在初始化完成，中断开启以后才有效
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void delay_ms(u32 ms)
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{
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u32 tick = GetDelayTick(ms);
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do
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{
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} while(!IsTickOut(tick));
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// for(int j=0;j<1000;j++)
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// delay_us(ms);
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}
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void delay_us(uint16_t us)
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{
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uint32_t j;
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while(us--)
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{
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j = SystemCoreClock / 1000000;
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while(j--);
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}
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}
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/* *************************************************************************
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Bootloader和App跳转设计要点
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1. Bootloader的程序在前面，大小为8K（0x08000000~0x08001FFF)
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App的程序在后面，从0x08002000开始，大小为0x3E000
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2. Bootloader的内存在前面，大小为2K（0x20000000~0x200007FF）
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App的内存在后面，从0x20000800开始，大小为0xF800
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3. 从Bootloader跳转到App：
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1）关闭全局中断响应（__disable_irq）
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2）禁止中断允许（将各中断的允许位清零）
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3）清除中断标志（将各中断的标志位清零）
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4) 设置堆栈（MSP）为App的堆栈值
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5）跳转到App的程序入口
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4. 从App跳转到Bootloader：
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直接系统复位，运行Bootloader
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5. Bootloader工程的特殊处理
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1）在Target页，按照上述要求设置IROM1和IRAM1
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2）在Linker页，勾选“Use Memory Layout from Target Dialog”
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6. App工程的特殊处理
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1）在Target页，按照上述要求设置IROM1和IRAM1
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2）在Linker页，勾选“Use Memory Layout from Target Dialog”
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3) 在system_stm32l4xx.c中修改以下代码：
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a. 将宏定义VECT_TAB_OFFSET改为0x2000
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b. 在SystemInit（）函数最后，重新打开全局中断响应（__enable_irq)
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7. 从App的任务中跳转到Bootloader，按第3条的方法试验不成功。
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具体原因未明，可能是因为要关掉的中断太多，没有一一试验；
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也可能是因为FreeRTOS将CPU的特权模式接管了，导致PSP、MSP设置无效等。
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************************************************************************* */
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typedef void (*pIapFun_TypeDef)(void); //定义一个函数类型的参数.
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// 实现从Bootloader跳转到App
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void JumpToEntry(uint32_t addr)
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{
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printf("\r\nJump to 0x%08X\r\n", addr);
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__disable_irq();
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SysTick->CTRL &= ~(SysTick_CTRL_ENABLE_Msk | SysTick_CTRL_TICKINT_Msk);
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__set_MSP(*(volatile uint32_t *) addr);
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((pIapFun_TypeDef) (*(volatile uint32_t *) (addr + 4)))();
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// 不应该到这里来
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while(1)
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printf(".");
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}
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// 实现从App跳转到Bootloader
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void JumpToLoader()
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{
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printf("\r\nJump to 0x%08X\r\n", (uint32_t) FLASH_BASE);
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// 直接复位，跳转到Bootloader
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HAL_NVIC_SystemReset();
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// 不应该到这里来
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while(1)
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printf(".");
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}
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// 实现串口发送
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USART_Handle huart1 = {USART1, 0, 0, 1, NULL, NULL, NULL};
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USART_Handle huart2 = {USART2, 0, 0, 1, NULL, NULL, NULL};
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USART_Handle huart3 = {USART3, 0, 0, 1, NULL, NULL, NULL};
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USART_Handle hlpuart1 = {LPUART1, 0, 0, 1, NULL, NULL, NULL};
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// 实现串口发送
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void UART_Transmit(USART_Handle *huart, uint8_t *buf, uint16_t len)
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{
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while(len--)
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{
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while(!(huart->Instance->ISR & LL_USART_ISR_TXE));
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huart->Instance->TDR = *buf++;
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while(!(huart->Instance->ISR & LL_USART_ISR_TC));
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}
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}
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// 实现以中断方式串口发送
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void UART_TxISR_8BIT(USART_Handle *huart)
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{
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/* Check that a Tx process is ongoing */
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if(!huart->BusyTx)
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return;
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if (huart->TxXferCount == 0U)
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{
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/* Disable the UART Transmit Data Register Empty Interrupt */
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CLEAR_BIT(huart->Instance->CR1, USART_CR1_TXEIE);
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/* Enable the UART Transmit Complete Interrupt */
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SET_BIT(huart->Instance->CR1, USART_CR1_TCIE);
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}
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else
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{
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huart->Instance->TDR = (uint8_t)(*huart->pTxBuffPtr & (uint8_t)0xFF);
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huart->pTxBuffPtr++;
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huart->TxXferCount--;
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}
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}
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uint8_t UART_Transmit_IT(USART_Handle *huart, uint8_t *pData, uint16_t Size)
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{
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/* Check that a Tx process is not already ongoing */
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if(huart->BusyTx)
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return 0;
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huart->pTxBuffPtr = pData;
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huart->TxXferCount = Size;
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huart->TxISR = UART_TxISR_8BIT;
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huart->BusyTx = 1;
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/* Enable the Transmit Data Register Empty interrupt */
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SET_BIT(huart->Instance->CR1, USART_CR1_TXEIE);
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return 1;
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}
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// 应用程序的串口中断处理
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void APP_USART_IRQHandler(USART_Handle *huart)
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{
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uint32_t isrflags = huart->Instance->ISR;
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uint32_t cr1its = huart->Instance->CR1;
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uint32_t errorflags = (isrflags & ((uint32_t)(USART_ISR_PE | USART_ISR_FE | USART_ISR_NE | USART_ISR_ORE)));
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// 清除错误状态
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LL_USART_ClearFlag_PE(huart->Instance);
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LL_USART_ClearFlag_FE(huart->Instance);
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LL_USART_ClearFlag_NE(huart->Instance);
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LL_USART_ClearFlag_ORE(huart->Instance);
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/* If no error occurs */
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if (errorflags == 0U)
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{
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/* UART in mode Receiver ---------------------------------------------------*/
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if (((isrflags & USART_ISR_RXNE) != 0U)
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&& ((cr1its & USART_CR1_RXNEIE) != 0U))
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{
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if(huart->RxISR)
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huart->RxISR(huart);
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else
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huart->Instance->RDR;
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}
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/* UART in mode Transmit ---------------------------------------------------*/
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if (((isrflags & USART_ISR_TXE) != 0U)
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&& ((cr1its & USART_CR1_TXEIE) != 0U))
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{
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if(huart->TxISR)
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huart->TxISR(huart);
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else
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{
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// 不应该到这里
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CLEAR_BIT(huart->Instance->CR1, USART_CR1_TXEIE);
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huart->BusyTx = 0;
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}
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}
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/* UART in mode Transmitter (transmission end) -----------------------------*/
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if (((isrflags & USART_ISR_TC) != 0U) && ((cr1its & USART_CR1_TCIE) != 0U))
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{
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/* Disable the UART Transmit Complete Interrupt */
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CLEAR_BIT(huart->Instance->CR1, USART_CR1_TCIE);
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// 清除发送忙标志
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huart->BusyTx = 0;
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}
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}
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}
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// 读取启动原因代码
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void Get_ResetFlags()
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{
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if(LL_RCC_IsActiveFlag_BORRST())
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SYS_RSTSTS |= 0x01;
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if(LL_RCC_IsActiveFlag_PINRST())
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SYS_RSTSTS |= 0x02;
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if(LL_RCC_IsActiveFlag_IWDGRST())
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SYS_RSTSTS |= 0x04;
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if(LL_RCC_IsActiveFlag_LPWRRST())
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SYS_RSTSTS |= 0x10;
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if(LL_RCC_IsActiveFlag_SFTRST())
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SYS_RSTSTS |= 0x20;
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// 清除启动标志
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__HAL_RCC_CLEAR_RESET_FLAGS();
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}
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