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1.说到OTA功能，实际上 往flash 指定区域写 数据, 拷贝数据，然后 跳转, 必要时 注意单片机的偏移量。

2.不多说废话，进入正题，区别这两款 单片机的在读写flash的 不同点.  go

在写本文时，L233支持单字写入，而L235只有双字写入. 一个写入地址+4   一个写入地址+8

在单片机里面表示 大概是 address += sizeof(uint32_t)   address += sizeof(uint64_t)

下面是写入flash 代码：

记得在写入前 擦除

void fmc_flags_clear(void)
{fmc_flag_clear(FMC_FLAG_END);fmc_flag_clear(FMC_FLAG_WPERR);fmc_flag_clear(FMC_FLAG_PGAERR);fmc_flag_clear(FMC_FLAG_PGERR);
}
void WriteFlash(uint32_t address,const uint8_t *pBuffer,uint32_t Numlengh)
{#ifdef GD32E230  //GD32L233uint32_t i,temp;fmc_unlock();for(i = 0; i < Numlengh;i+= 4){temp =  (uint32_t)pBuffer[i+3]<<24;temp |=  (uint32_t)pBuffer[i+2]<<16;temp |=  (uint32_t)pBuffer[i+1]<<8;temp |=  (uint32_t)pBuffer[i];fmc_word_program(address+i,temp);fmc_flag_clear(FMC_FLAG_END | FMC_FLAG_WPERR | FMC_FLAG_PGERR);}fmc_lock();#endif#ifdef GD32L235uint32_t i;uint32_t temp1,temp2;uint64_t temp_v;fmc_unlock();for(i = 0; i < Numlengh;i+=8){temp1 =  (uint32_t)pBuffer[i+3]<<24;temp1 |=  (uint32_t)pBuffer[i+2]<<16;temp1 |=  (uint32_t)pBuffer[i+1]<<8;temp1 |=  (uint32_t)pBuffer[i];temp2 =   (uint32_t)pBuffer[i+7]<<24;temp2 |=  (uint32_t)pBuffer[i+6]<<16;temp2 |=  (uint32_t)pBuffer[i+5]<<8;temp2 |=  (uint32_t)pBuffer[i+4];temp_v = ((uint64_t)temp2) << 32 | temp1;fmc_doubleword_program(address+i,temp_v);fmc_flags_clear();}fmc_lock();#endif
}

这个是  自己写的擦除一页 数据，当然可以参考 提供的demo去实现，看自己需求

uint8_t EarseFlash_1K(uint32_t address){//PR_INFO("begin_earse,0x%X\r\n",address);fmc_state_enum fmc_state;if(address % 1024 == 0){fmc_unlock();fmc_flags_clear();fmc_state = fmc_page_erase(address);if(fmc_state == FMC_READY){PR_INFO("erase_ok\r\n");}else{PR_ERR("erase_fail\r\n");}fmc_flags_clear();fmc_lock();}else{PR_NOTICE("without_EarseFlash_1K\r\n");return 0;}return 1;
}

接下来是  读取 双字,也就是在L235上的读取

void ReadFlashTwoWorld(uint32_t address,uint8_t *Nbuffer,uint32_t  length){uint64_t temp = 0;uint32_t count = 0;while(count < length){temp = *((volatile uint64_t *)address);*Nbuffer++ = (temp & 0xff);count++;if(count >= length)break;*Nbuffer++ = (temp >> 8) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 16) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 24) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 32) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 40) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 48) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 56) & 0xff;count++;if(count >= length)break;address += sizeof(uint64_t);}
}

以及 下面的  读取单字的  ( GD32L233  以及 GD32E230 )

void ReadFlash(uint32_t address,uint8_t *Nbuffer,uint32_t  length)
{uint32_t temp = 0;uint32_t count = 0;while(count < length){temp = *((volatile uint32_t *)address);*Nbuffer++ = (temp & 0xff);count++;if(count >= length)break;*Nbuffer++ = (temp >> 8) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 16) & 0xff;count++;if(count >= length)break;*Nbuffer++ = (temp >> 24) & 0xff;count++;if(count >= length)break;#ifdef GD32E230       //GD32L233address += 4;#endif}
}