在這篇的基礎之上，我們今天學習使用AC7802的串口收發。

1、把原來的工程復制一份到新的文件夾，并重命名為AC7802_UART工程。

2、新建Uart.h、Uart.c，內容如下：

#ifndef UART_H

#define UART_H

#include "ac780x_uart.h"

void UART_Cfg_Init(void);

#endif

Uart.c

#include

#include "ac780x_gpio.h"

#include "ac780x_uart_reg.h"

#include "Uart.h"

#define RX_BUF_LEN 100U

uint8_t g_rxLen = 0; /*!< 串口接收長度變量 */

uint8_t g_txLen = 0; /* !< 串口發送長度變量 */

uint8_t g_txCnt = 0;

uint8_t g_rxBuf[RX_BUF_LEN] = {0}; /* !< 串口接收數組 */

/*!

• @brief 串口回調函數
• @param void *device：UART_Type pointer
  uint32_t wpara：UART lsr0 register
  uint32_t lpara：UART lsr1 register
• @return none
  */
  void UART_Callback(void *device, uint32_t wpara, uint32_t lpara)
  {
  UART_Type *Uart_Device = (UART_Type *)device;

/*! 串口接收中斷 */

if(wpara & UART_LSR0_DR_Msk)

{

g_rxBuf[g_rxLen++] = UART_ReceiveData(Uart_Device);

if(g_rxLen > RX_BUF_LEN)

{

g_rxLen = 0;

}

}

/*!< 發送fifo空中斷 */

if(Uart_Device->IER & UART_IER_ETXE_Msk)

{

UART_SendData(Uart_Device,g_rxBuf[g_txCnt++]);

if(g_txCnt >= g_txLen)

{

g_txCnt = 0;

UART_SetTXEInterrupt(Uart_Device, DISABLE);

}

}

/*!< 串口空閑中斷 */

if(lpara & UART_LSR1_IDLE_Msk)

{

g_txLen = g_rxLen;

g_rxLen = 0;

UART_SetTXEInterrupt(Uart_Device, ENABLE);

}

}

/*!

• @brief uart configuration init
• @param none
• @return none
  */
  void UART_Cfg_Init(void)
  {
  UART_ConfigType uart_config;

GPIO_SetFunc(GPIOA, GPIO_PIN4, GPIO_FUN3); /*! uart tx */

GPIO_SetFunc(GPIOA, GPIO_PIN5, GPIO_FUN3); /* ! uart rx */

uart_config.baudrate = 115200; /*! 波特率115200 */

uart_config.dataBits = UART_WORD_LEN_8BIT; /* ! 數據8bit */

uart_config.stopBits = UART_STOP_1BIT; /* ! 停止位1bit */

uart_config.fifoByteEn = DISABLE;

uart_config.sampleCnt = UART_SMP_CNT0; /* ! 16倍采樣 */

uart_config.callBack = UART_Callback; /* ! 回調函數設置 */

UART_Init(UART1,&uart_config); /*! 串口初始化 */

UART_SetRXNEInterrupt(UART1, ENABLE); /*! 串口接收中斷使能 */

UART_SetIdleFuncEn(UART1, ENABLE);

UART_SetIdleInterrupt(UART1, ENABLE); /*! 使能串口空閑中斷 */

NVIC_SetPriority(UART1_IRQn, 3); /*! 串口中斷優先級 */

NVIC_ClearPendingIRQ(UART1_IRQn);

NVIC_EnableIRQ(UART1_IRQn);

}

3、修改makefile內容中的TARGET 為：AC7802_UART。去掉原來gpio.c，新建Uart.c，增加ac78x_uart.c：

C sources

C_SOURCES =

Src/main.c

Src/AC7802x_irq_cb.c

Src/AC7802x_msp.c

Src/system_AC7802x.c

Drivers/ATC_Driver/Src/ac780x_gpio.c

Drivers/ATC_Driver/Src/ac780x_ckgen.c

Drivers/ATC_Driver/Src/ac780x_spm.c

Drivers/ATC_Driver/Src/ac780x_uart.c

User/Src/Uart.c

4、make結果如下：

lugl@lugl-virtual-machine:~/ac7802/AC7802_UART$ make

mkdir build

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/main.d" -Wa,-a,-ad,-alms=build/main.lst Src/main.c -o build/main.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/AC7802x_irq_cb.d" -Wa,-a,-ad,-alms=build/AC7802x_irq_cb.lst Src/AC7802x_irq_cb.c -o build/AC7802x_irq_cb.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/AC7802x_msp.d" -Wa,-a,-ad,-alms=build/AC7802x_msp.lst Src/AC7802x_msp.c -o build/AC7802x_msp.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/system_AC7802x.d" -Wa,-a,-ad,-alms=build/system_AC7802x.lst Src/system_AC7802x.c -o build/system_AC7802x.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/ac780x_gpio.d" -Wa,-a,-ad,-alms=build/ac780x_gpio.lst Drivers/ATC_Driver/Src/ac780x_gpio.c -o build/ac780x_gpio.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/ac780x_ckgen.d" -Wa,-a,-ad,-alms=build/ac780x_ckgen.lst Drivers/ATC_Driver/Src/ac780x_ckgen.c -o build/ac780x_ckgen.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/ac780x_spm.d" -Wa,-a,-ad,-alms=build/ac780x_spm.lst Drivers/ATC_Driver/Src/ac780x_spm.c -o build/ac780x_spm.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/ac780x_uart.d" -Wa,-a,-ad,-alms=build/ac780x_uart.lst Drivers/ATC_Driver/Src/ac780x_uart.c -o build/ac780x_uart.o

arm-none-eabi-gcc -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/Uart.d" -Wa,-a,-ad,-alms=build/Uart.lst User/Src/Uart.c -o build/Uart.o

arm-none-eabi-gcc -x assembler-with-cpp -c -mcpu=cortex-m0plus -mthumb -IInc -IDrivers/ATC_Driver/Inc -IDrivers/Device/Include -IDrivers/Device -IDrivers/Device/Include/CMSIS -IUser/Inc -O0 -Wall -fdata-sections -ffunction-sections -g -gdwarf-2 -MMD -MP -MF"build/startup_AC7802x.d" startup_AC7802x.s -o build/startup_AC7802x.o

arm-none-eabi-gcc build/main.o build/AC7802x_irq_cb.o build/AC7802x_msp.o build/system_AC7802x.o build/ac780x_gpio.o build/ac780x_ckgen.o build/ac780x_spm.o build/ac780x_uart.o build/Uart.o build/startup_AC7802x.o -mcpu=cortex-m0plus -mthumb -specs=nano.specs -TAC78022MBQA_FLASH.ld -lc -lm -lnosys -Wl,-Map=build/AC7802_UART.map,--cref -Wl,--gc-sections -o build/AC7802_UART.elf

arm-none-eabi-size build/AC7802_UART.elf

text data bss dec hex filename

12016 12 2220 14248 37a8 build/AC7802_UART.elf

arm-none-eabi-objcopy -O ihex build/AC7802_UART.elf build/AC7802_UART.hex

arm-none-eabi-objcopy -O binary -S build/AC7802_UART.elf build/AC7802_UART.bin

5、輸入下載命令：

lugl@lugl-virtual-machine:~/ac7802/AC7802_UART$ pyocd flash ./build/AC7802_UART.elf --target ac78022mbqa

0000426 I Loading /home/lugl/ac7802/AC7802_UART/build/AC7802_UART.elf [load_cmd]

[==================================================] 100%

0001139 I Erased 0 bytes (0 sectors), programmed 0 bytes (0 pages), skipped 12288 bytes (24 pages) at 16.84 kB/s [loader]

6、同時為了方便下載，我們在makefile后面增加 makefile flash命令實現下載:

flash:

pyocd flash ./build/AC7802_UART.elf --target ac78022mbqa

我們在執行make falsh后就可以實現下載功能了：

lugl@lugl-virtual-machine:~/ac7802/AC7802_UART$ make flash

pyocd flash ./build/AC7802_UART.elf --target ac78022mbqa

0000445 I Loading /home/lugl/ac7802/AC7802_UART/build/AC7802_UART.elf [load_cmd]

[==================================================] 100%

0001146 I Erased 0 bytes (0 sectors), programmed 0 bytes (0 pages), skipped 12288 bytes (24 pages) at 17.16 kB/s [loader]

l

7、實現效果：下載后，我們用typec線接到開發板的typec接口，打開串口助手，我們就可以實現不定義發送，同時AC7802把接收到的數據回顯回來：

[20:21:10.657]發→◇AT1313123112123123

□

[20:21:10.661]收←◆AT1313123112123123

[20:47:13.157]發→◇AT13131231

□

[20:47:13.160]收←◆AT13131231

[20:47:22.561]發→◇你好

□

[20:47:22.563]收←◆你好

[20:47:30.890]發→◇你好 AC7802X

□

[20:47:30.893]收←◆你好 AC7802X

【總結】杰發的庫函數做得非常好，給的示例也非常好，使得學習起來非?？旖?。同時在linux環境下，用vscode也開發，也是非常之方便。體驗了編程之快樂！