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56 在standby待机打通uart调试的方法

news 来源：原创 2025/5/24 7:28:49

修改点如下：

一，进入standby保证uart通

1, 去掉串口进入休眠RT_DEVICE_CTRL_SUSPEND:关闭uart，保证BSP_IO_Power_Down函数执行完前，串口都可以打印，和通过SifliUsartServer工具串口连接，并debug死机问题；

二，从standby唤醒保证uart通

standby唤醒打开串口比较麻烦，此时RTT系统还没有恢复，外部Nor/Nand Flash都没有初始化不可以用，除了Retention RAM外，其他的RAM也还不能访问，打通Uart的思路，就是在GPIO通了HAL_HPAON_ENABLE_PAD();以后，对uart进行初始化配置，并且此时的代码都需要放在RAM内运行，rt_kprintf(""); 在rtt系统和恢复RT_DEVICE_CTRL_RESUME:之前，都是不能打印的，如果一定要打印，用hal_printf("BSP_Power_Up\n");打印，而且不能在if (PM_STANDBY_BOOT == SystemPowerOnModeGet()) 待机唤醒起来的代码内才能运行，其他上电时uart没有初始化，也是会死机；修改点如下：

drv_usart.c文件新增加的hal初始uart的函数和打印函数；

/* UART handler declaration */
static UART_HandleTypeDef UartHandle;#define BUFFER_SIZE 256
#define HALF_BUFFER_SIZE (BUFFER_SIZE/2)
static DMA_HandleTypeDef dma_rx_handle;
static uint8_t buffer[BUFFER_SIZE];// 定义接收状态枚举
typedef enum
{STATE_UNFULL,STATE_HALF_FULL,STATE_FULL
} ReceiveState;
// 当前接收状态
ReceiveState currentState = STATE_UNFULL;HAL_RAM_RET_CODE_SECT(HAL_UART_CONFIG, static void HAL_UART_CONFIG(struct sifli_uart_config *cfg, rt_size_t obj_num, rt_uint32_t baud_rate))
{/* Output a message on console using printf function */for (int i = 0; i < obj_num; i++){/*##-1- Configure the UART peripheral ######################################*//* Put the USART peripheral in the Asynchronous mode (UART Mode) *//* UART configured as follows:- Word Length = 8 Bits (8 data bit + 0 parity bit) :BE CAREFUL : Program 7 data bits + 1 parity bit in PC HyperTerminal- Stop Bit    = One Stop bit- Parity      = No parity- BaudRate    = 1000000 baud- Hardware flow control disabled (RTS and CTS signals) */UartHandle.Instance        = cfg->Instance;UartHandle.Init.BaudRate   = RT_SERIAL_DEFAULT_BAUDRATE;UartHandle.Init.WordLength = UART_WORDLENGTH_8B;UartHandle.Init.StopBits   = UART_STOPBITS_1;UartHandle.Init.Parity     = UART_PARITY_NONE;UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;UartHandle.Init.Mode       = UART_MODE_TX_RX;UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;if (UartHandle.Init.Parity){// If parity is odd/even, parity should +1UartHandle.Init.WordLength = UART_WORDLENGTH_9B;}/* 1, pinmux set to uart mode */HAL_PIN_Set(PAD_PA30, USART1_RXD, PIN_PULLUP, 1);   // UART1_RXDHAL_PIN_Set(PAD_PA34, USART1_TXD, PIN_PULLUP, 1);   // UART1_TXD/* 2, open uart2 clock source  */HAL_RCC_EnableModule(RCC_MOD_USART1);if (HAL_UART_Init(&UartHandle) != HAL_OK){/* Initialization Error */HAL_ASSERT(0);}// Start RX DMA__HAL_LINKDMA(&(UartHandle), hdmarx, dma_rx_handle);dma_rx_handle.Instance = cfg->dma_rx->Instance;dma_rx_handle.Init.Request = cfg->dma_rx->request;HAL_UART_DmaTransmit(&UartHandle, buffer, BUFFER_SIZE, DMA_PERIPH_TO_MEMORY); /* DMA_PERIPH_TO_MEMORY */#ifndef DMA_SUPPORT_DYN_CHANNEL_ALLOC// Enable DMA IRQHAL_NVIC_SetPriority(cfg->dma_rx->dma_irq_prio, 0, 0);HAL_NVIC_EnableIRQ(cfg->dma_rx->dma_irq);
#endif /* !DMA_SUPPORT_DYN_CHANNEL_ALLOC */{// For RX DMA, also need to enable UART IRQ.__HAL_UART_ENABLE_IT(&UartHandle, UART_IT_IDLE); /* Set to generates interrupts when UART idle */HAL_NVIC_SetPriority(cfg->dma_rx->dma_irq_prio, 1, 0);HAL_NVIC_EnableIRQ(cfg->dma_rx->dma_irq);}/* Output a message on Hyperterminal using printf function *//* Output a message on Hyperterminal using hal function */uint8_t ptr[] = {'u', 'a', 'r', 't', '1', ' ', 'r', 'e', 'a', 'd', 'y', '\n'};int len = sizeof(ptr);HAL_UART_Transmit(&UartHandle, ptr, len, 0xFFFF);}
}
HAL_RAM_RET_CODE_SECT(hal_hw_usart_init,   void hal_hw_usart_init(void))
{rt_size_t obj_num = sizeof(uart_obj) / sizeof(struct sifli_uart);if (obj_num > 0){sifli_uart_get_dma_config();HAL_UART_CONFIG(uart_config, obj_num, RT_SERIAL_DEFAULT_BAUDRATE);}
}
HAL_RAM_RET_CODE_SECT(hal_printf,    void hal_printf(char *fmt, ...))
{HAL_UART_Transmit(&UartHandle, fmt, 20, 0xFFFF);
}

2，相关hal初始uart的函数和打印函数以及调用的底层HAL文件都要放到RAM内运行，

就是这三个文件，HAL_RAM_RET_CODE_SECT(hal_hw_usart_init, void hal_hw_usart_init(void))这个函数都要调用到，需要放到RAM内，要添加在RW_IRAM_RET HPSYS_RETM_BASE HPSYS_RETM_SIZE {这个段内，如下图：