2024-04-23 13:39:54 +00:00
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created: 2024-04-23
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tags:
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- "#RISC_V"
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- "#低功耗"
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- "#CH57X"
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- 代码块
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- mcu
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---
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# 低功耗
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2024-04-23 14:04:32 +00:00
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使用官方例子最低功耗仍有约2mA，经察，默认GPIO的配置由`GPIO_ModeIN_PU`改为`GPIO_ModeIN_PD`能显著降低功耗，可低至约35uA，代码如下：
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```c hl:26-27
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2024-04-23 13:39:54 +00:00
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/*********************************************************************
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* @fn DebugInit
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*
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* @brief 调试初始化
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*
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* @return none
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*/
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void DebugInit(void)
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{
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GPIOA_SetBits(GPIO_Pin_9);
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GPIOA_ModeCfg(GPIO_Pin_9, GPIO_ModeOut_PP_5mA);
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UART1_DefInit();
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}
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/*********************************************************************
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* @fn main
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*
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* @brief 主函数
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*
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* @return none
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*/
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int main()
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{
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SetSysClock(CLK_SOURCE_PLL_60MHz);
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GPIOA_ModeCfg(GPIO_Pin_All, GPIO_ModeIN_PD);
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GPIOB_ModeCfg(GPIO_Pin_All, GPIO_ModeIN_PD);
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GPIOA_ModeCfg(GPIO_Pin_8, GPIO_ModeIN_PU);
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/* 配置串口调试 */
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DebugInit();
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PRINT("Start @ChipID=%02x\n", R8_CHIP_ID);
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DelayMs(200);
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PRINT("sleep mode sleep \n");
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DelayMs(2);
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LowPower_Sleep(RB_PWR_RAM16K | RB_PWR_RAM2K); //只保留14+2K SRAM 供电
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HSECFG_Current(HSE_RCur_100); // 降为额定电流(低功耗函数中提升了HSE偏置电流)
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DelayMs(5);
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PRINT("wake.. \n");
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DelayMs(500);
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while(1);
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}
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```
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参考的一些例子：
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[基于CH573的BLE温湿度传感器](https://yuanze.wang/posts/ch573-temp-humid-beacon/)，源码可编译
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[CH571F无线温湿度计](https://oshwhub.com/thelight/ch571f-wu-xian-wen-shi-du-ji)，源码不能正常编译
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