NXP LPC1758 Bootloader 使用串口0 支持xmodem1k协议

ID:697058 · 发表于 2020-2-24 12:28

NXP LPC1758 Bootloader 使用串口0 支持xmodem1k协议，可以使用超级终端将应用程序上传到FLASH实现IAP程序升级

单片机源程序如下:

#include "LPC17xx.h" /* LPC17xx外设寄存器 */
#include "../UART/uart.h"
#include "../IAP/iap.h"
#include "../CRC/crc.h"
#include "../XMODEM1K/xmodem1k.h"
#include <string.h>
extern uint32_t SystemFrequency;
/*
* Define flash memory address at which user application is located
*/
#define APP_START_ADDR 0x00010000UL
#define APP_END_ADDR 0x00080000UL /* LPC1766 256K Flash */
/*
* Define the flash sectors used by the application
*/
#define APP_START_SECTOR 16
#define APP_END_SECTOR 29 /* LPC1766 256K Flash */
volatile uint32_t IAPFlagTimeOut;
static uint32_t u32InvalidateApp(void);
void ExceuteApplication(void);
static void vBootLoader_Task(void);
static uint32_t u32BootLoader_AppPresent(void);
static uint32_t u32Bootloader_WriteCRC(uint16_t u16CRC);
static uint32_t u32BootLoader_ProgramFlash(uint8_t *pu8Data, uint16_t u16Len);
/*********************************************************************************************************
** Function name: Timer0_Init
** Descriptions: 定时器0初始化程序
** input parameters: 无
** output parameters: 无
** Returned value: 无
*********************************************************************************************************/
void Timer0_Init (uint32_t ulsec)
{
LPC_TIM0->TCR = 0x02;
LPC_TIM0->IR = 0x01;
LPC_TIM0->CTCR = 0;
LPC_TIM0->TC = 0;
LPC_TIM0->PR = 0;
LPC_TIM0->MR0 = (SystemFrequency/4)*ulsec; /* nS中断1次 */
LPC_TIM0->MCR = 0x05; /* 匹配后产生中断 */
LPC_TIM0->TCR = 0x01; /* 启动定时器 */
}
/*********************************************************************************************************
** Function name: JMP_Boot
** Descriptions: 跳转到应用程序
** input parameters: address 应用程序地址
** output parameters: 无
** Returned value: 无
*********************************************************************************************************/
__asm void JMP_Boot( uint32_t address ){
LDR SP, [R0] ;Load new stack pointer address
LDR PC, [R0, #4] ;Load new program counter address
}
/*********************************************************************************************************
** Function name: Boot
** Descriptions: 跳转到应用程序
** input parameters: 无
** output parameters: 无
** Returned value: 无
*********************************************************************************************************/
void Boot( void )
{
SCB->VTOR = APP_START_ADDR & 0x1FFFFF80; //修改中断向量表
//SCB->VTOR = APP_START_ADDR;
JMP_Boot(APP_START_ADDR);
}
/*********************************************************************************************************
** Function name: main
** Descriptions: Bootloader控制循环
** input parameters: 无
** output parameters: 无
** Returned value: 无
*********************************************************************************************************/
int main(void)
{
uint8_t uartBuffer[16], len;
SystemInit();
vUARTInit(BAUD_RATE); //P0.2,P0.3对就串口0，115200
vUARTSend((uint8_t *)("\r\nLPC1700 Ready For Updates >"), strlen("\r\nLPC1700 Ready For Updates >"));
Timer0_Init (10);
len = 0;
//获取IAP升级命令IAP
while (1)
{
if ((LPC_TIM0->IR & 0x01) == 0x01)
{
LPC_TIM0->IR = 0x01; /* 清除中断标志 */
IAPFlagTimeOut = 1; /* 等待升级命令超时 */
vUARTSend((uint8_t *)("\r\nTimeout waiting for the upgrade command!\r\n"), strlen("\r\nTimeout waiting for the upgrade command!\r\n"));
break;
}
//等待置信IAP字例入IAP升级，超进退出。
if (u8UARTReceive(uartBuffer) > 0)
{ /* 判断升级命令 IAP */
vUARTSend(uartBuffer, 1);
if (uartBuffer[0] == 'I')
{
len = 1;
}
if (uartBuffer[0] == 'A')
{
if (len == 1)
{
len = 2;
}
else
{
len = 0;
}
}
if (uartBuffer[0] == 'P')
{
if (len == 2)
{
len = 3;
}
else
{
len = 0;
}
}
}
if (len == 3)
{
IAPFlagTimeOut = 0;
vUARTSend((uint8_t *)("\r\nReceiving a successful upgrade command!\r\n"), strlen("\r\nReceiving a successful upgrade command!\r\n"));
break;
}
}
if (IAPFlagTimeOut == 0)
{
if (u32InvalidateApp() == 0)
{
vUARTSend((uint8_t *)("\r\nErase mark CRC failed!\r\n"), strlen("\r\nErase mark CRC failed!\r\n"));
if ((u32IAP_PrepareSectors(APP_END_SECTOR, APP_END_SECTOR) == IAP_STA_CMD_SUCCESS)
&& (u32IAP_EraseSectors(APP_END_SECTOR, APP_END_SECTOR) == IAP_STA_CMD_SUCCESS))
{
vUARTSend((uint8_t *)("\r\nErase the last sector!\r\n"), strlen("\r\nErase the last sector!\r\n"));
}
/* Restart and bootloader will begin */
SCB->AIRCR = (0x05fa << 16) + 1;
}
}
/* Verify if a valid user application is present in the upper sectors
of flash memory. */
if (u32BootLoader_AppPresent() == 0)
{
vUARTSend((uint8_t *)("Into upgrade state!\r\n"), strlen("Into upgrade state!\r\n"));
/* Valid application not present, execute bootloader task that will
obtain a new application and program it to flash.. */
vBootLoader_Task();
/* Above function only returns when new application image has been
successfully programmed into flash. Begin execution of this new
application by resetting the device. */
if (u32BootLoader_AppPresent() != 0) {
vUARTSend((uint8_t *)("\r\nExecute user code!\r\n"), strlen("\r\nExecute user code!\r\n"));
//SCB->VTOR = APP_START_ADDR & 0x1FFFFF80; /* 重新映射向量表 */
//vUARTSend((uint8_t *)("\r\VTOR\r\n"), strlen("\r\VTOR\r\n"));
//ExceuteApplication();
LPC_TIM0->IR = 0x00; //关闭定时器
Boot();
vUARTSend((uint8_t *)("\r\boot faild\r\n"), strlen("\r\boot faild\r\n"));
} else {
vUARTSend((uint8_t *)("\r\nUpgrade failure!\r\n"), strlen("\r\nUpgrade failure!\r\n"));
SCB->AIRCR = (0x05fa << 16) + 1;
}
}
else
{
vUARTSend((uint8_t *)("\r\nExecute user code!\r\n"), strlen("\r\nExecute user code!\r\n"));
/* Valid application located in the next sector(s) of flash so execute */
//SCB->VTOR = APP_START_ADDR & 0x1FFFFF80; /* 重新映射向量表 */
//vUARTSend((uint8_t *)("\r\VTOR1\r\n"), strlen("\r\VTOR1\r\n"));
//ExceuteApplication();
LPC_TIM0->IR = 0x00; //关闭定时器
Boot();
vUARTSend((uint8_t *)("\r\boot faild!!\r\n"), strlen("\r\boot faild!!\r\n"));
/* User application execution should now start and never return here.... */
}
/* This should never be executed.. */
return 0;
}
__asm void ExceuteApplication(void)
{
/* Load main stack pointer with application stack pointer initial value,
stored at first location of application area */
ldr r0, =0x1000
ldr r0, [r0]
mov sp, r0
/* Load program counter with application reset vector address, located at
second word of application area. */
ldr r0, =0x1004
ldr r0, [r0]
BX r0
}
/*****************************************************************************
** Function name: vBootLoader_Task
**
** Description: Erases application flash area and starts XMODEM client so
** that new application can be downloaded.
**
** Parameters: None
**
** Returned value: None
**
*****************************************************************************/
static void vBootLoader_Task(void)
{
/* Erase the application flash area so it is ready to be reprogrammed with the new application */
if (u32IAP_PrepareSectors(APP_START_SECTOR, APP_END_SECTOR) == IAP_STA_CMD_SUCCESS)
{
if (u32IAP_EraseSectors(APP_START_SECTOR, APP_END_SECTOR) == IAP_STA_CMD_SUCCESS)
{
uint16_t u16CRC = 0;
/* Start the xmodem client, this function only returns when a
transfer is complete. Pass it pointer to function that will
handle received data packets */
vXmodem1k_Client(&u32BootLoader_ProgramFlash);
/* Programming is now complete, calculate the CRC of the flash image */
u16CRC = u16CRC_Calc16((const uint8_t *)APP_START_ADDR, (APP_END_ADDR - APP_START_ADDR - 4));
/* Write the CRC value into the last 16-bit location of flash, this
will be used to check for a valid application at startup */
(void)u32Bootloader_WriteCRC(u16CRC);
}
}
}
/*****************************************************************************
** Function name: u32Bootloader_WriteCRC
**
** Description: Writes a 16-bit CRC value to the last location in flash
** memory, the bootloader uses this value to check for a valid
** application at startup.
**
** Parameters: u16CRC - CRC value to be written to flash
**
** Returned value: 1 if CRC written to flash successfully, otherwise 0.
**
*****************************************************************************/
static uint32_t u32Bootloader_WriteCRC(uint16_t u16CRC)
{
uint32_t i;
uint32_t u32Result = 0;
uint32_t a32DummyData[IAP_FLASH_PAGE_SIZE_WORDS];
uint32_t *pu32Mem = (uint32_t *)(APP_END_ADDR - IAP_FLASH_PAGE_SIZE_BYTES);
/* First copy the data that is currently present in the last page of
flash into a temporary buffer */
for (i = 0 ; i < IAP_FLASH_PAGE_SIZE_WORDS; i++)
{
a32DummyData[i] = *pu32Mem++;
}
/* Set the CRC value to be written back */
a32DummyData[IAP_FLASH_PAGE_SIZE_WORDS - 1] = (uint32_t)u16CRC;
if (u32IAP_PrepareSectors(APP_END_SECTOR, APP_END_SECTOR) == IAP_STA_CMD_SUCCESS)
{
/* Now write the data back, only the CRC bits have changed */
if (u32IAP_CopyRAMToFlash((APP_END_ADDR - IAP_FLASH_PAGE_SIZE_BYTES),
(uint32_t)a32DummyData,
IAP_FLASH_PAGE_SIZE_BYTES) == IAP_STA_CMD_SUCCESS)
{
u32Result = 1;
}
}
return (u32Result);
}
/*****************************************************************************
** Function name: u32BootLoader_ProgramFlash
**
** Description:
**
** Parameters: None
**
** Returned value: 0 if programming failed, otherwise 1.
**
*****************************************************************************/
static uint32_t u32BootLoader_ProgramFlash(uint8_t *pu8Data, uint16_t u16Len)
{
uint32_t u32Result = 0;
static uint32_t u32NextFlashWriteAddr = APP_START_ADDR;
if ((pu8Data != 0) && (u16Len != 0))
{
/* Prepare the flash application sectors for reprogramming */
if (u32IAP_PrepareSectors(APP_START_SECTOR, APP_END_SECTOR) == IAP_STA_CMD_SUCCESS)
{
/* Ensure that amount of data written to flash is at minimum the
size of a flash page */
if (u16Len < IAP_FLASH_PAGE_SIZE_BYTES)
{
u16Len = IAP_FLASH_PAGE_SIZE_BYTES;
}
/* Write the data to flash */
if (u32IAP_CopyRAMToFlash(u32NextFlashWriteAddr, (uint32_t)pu8Data, u16Len) == IAP_STA_CMD_SUCCESS)
{
/* Check that the write was successful */
if (u32IAP_Compare(u32NextFlashWriteAddr, (uint32_t)pu8Data, u16Len, 0) == IAP_STA_CMD_SUCCESS)
{
/* Write was successful */
u32NextFlashWriteAddr += u16Len;
u32Result = 1;
}
}
}
}
return (u32Result);
}
/*****************************************************************************
** Function name: u32BootLoader_AppPresent
**
** Description: Checks if an application is present by comparing CRC of
** flash contents with value present at last location in flash.
**
** Parameters: None
**
** Returned value: 1 if application present, otherwise 0.
**
*****************************************************************************/
static uint32_t u32BootLoader_AppPresent(void)
{
uint16_t u16CRC = 0;
uint32_t u32AppPresent = 0;
uint16_t *pu16AppCRC = (uint16_t *)(APP_END_ADDR - 4);
/* Check if a CRC value is present in application flash area */
if (*pu16AppCRC != 0xFFFFUL)
{
/* Memory occupied by application CRC is not blank so calculate CRC of
image in application area of flash memory, and check against this
CRC.. */
u16CRC = u16CRC_Calc16((const uint8_t *)APP_START_ADDR, (APP_END_ADDR - APP_START_ADDR - 4));
if (*pu16AppCRC == u16CRC)
{
u32AppPresent = 1;
}
}
return u32AppPresent;
}
/*****************************************************************************
** Function name: u32InvalidateApp
**
** Description: Corrupt the application CRC value that is written into the
** last location of flash by the bootloader.
**
** Parameters: None
**
** Returned value: Zero if unsuccessful, otherwise 1
**
*****************************************************************************/
uint32_t u32InvalidateApp(void)
{
uint32_t i;
uint32_t u32Result = 0;
uint32_t a32DummyData[IAP_FLASH_PAGE_SIZE_WORDS];
uint32_t *pu32Mem = (uint32_t *)(APP_END_ADDR - IAP_FLASH_PAGE_SIZE_BYTES);
/* First copy the data that is currently present in the last page of
flash into a temporary buffer */
for (i = 0 ; i < IAP_FLASH_PAGE_SIZE_WORDS; i++)
{
a32DummyData[i] = *pu32Mem++;
}
/* Set the CRC value to be written back, corrupt by setting all ones to zeros */
a32DummyData[IAP_FLASH_PAGE_SIZE_WORDS - 1] = 0x0000;
if (u32IAP_PrepareSectors(APP_END_SECTOR, APP_END_SECTOR) == IAP_STA_CMD_SUCCESS)
{
/* Now write the data back, only the CRC bits have changed */
if (u32IAP_CopyRAMToFlash((APP_END_ADDR - IAP_FLASH_PAGE_SIZE_BYTES),
(uint32_t)a32DummyData,
IAP_FLASH_PAGE_SIZE_BYTES) == IAP_STA_CMD_SUCCESS)
{
u32Result = 1;
}
}
return (u32Result);
}

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NXP LPC1758 Bootloader 使用串口0 支持xmodem1k协议

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