感谢雅特力及21IC论坛提供开发板进行评测学习。F423系列芯片外设资源十分丰富，DAC，USB-OTG,CAN控制器应有尽有，256K/48K存储满足大多数仪表产品开发应用。
1、作为资源丰富的MCU，要充分发挥MCU实时性，使用操作系统是最好的选择，本次测试采用RTX系统，arm官方出品，是当前arm芯片上可用的速度最快的RTOS。
项目添加如下文件即可：
RTX的启动十分简单，如下所示：
- osKernelInitialize(); // Initialize CMSIS-RTOS
- thread_init();
- if (osKernelGetState() == osKernelReady)
- {
- osKernelStart(); // Start thread execution
- }
- while (1)
- {
- }
- static void com_hal_init(uint8_t comMode, uint32_t ulBaudRate, com_parity_type eParity)
- {
- uint32_t us10TimerSv;
- uint32_t ClocksPer2ms;
- usart_data_bit_num_type dat_bits;
- usart_stop_bit_num_type stop_bits;
- usart_parity_selection_type parity;
- com_pin_cfg();
- set_u8(&ComObj, 0, sizeof(ComObj));
- if (eParity == COM_PAR_ODD)
- {
- dat_bits = USART_DATA_9BITS;
- stop_bits = USART_STOP_1_BIT;
- parity = USART_PARITY_ODD;
- }
- else if (eParity == COM_PAR_EVEN)
- {
- dat_bits = USART_DATA_9BITS;
- stop_bits = USART_STOP_1_BIT;
- parity = USART_PARITY_EVEN;
- }
- else if (eParity == COM_PAR_NONE_2S)
- {
- dat_bits = USART_DATA_8BITS;
- stop_bits = USART_STOP_2_BIT;
- parity = USART_PARITY_NONE;
- }
- else
- {
- dat_bits = USART_DATA_8BITS;
- stop_bits = USART_STOP_1_BIT;
- parity = USART_PARITY_NONE;
- }
- // 11*3.5*(1E6)/ba/50 = 77*1E4/ba
- if (ulBaudRate > 19200)
- {
- ClocksPer2ms = 1800 * ulBaudRate / 1000000 + 1;
- if (ClocksPer2ms < 41)
- ClocksPer2ms = 41;
- else if (ClocksPer2ms > 255)
- ClocksPer2ms = 255;
- // TOI 时间设置
- }
- else
- {
- // Time-out Register ,TX-DLY=0, TX-TIMEOUT=40
- // TOI 时间设置
- }
- // 报文通知延时
- us10TimerSv = com_timer_cal(ulBaudRate, 11 * 5, 300, 20000);
- ComObj.rcv_end_time_sv = us10TimerSv / 100;
- if (comMode > 0)
- {
- ComObj.rcv_end_time_sv++;
- }
- usart_init(comPORT, ulBaudRate, dat_bits, stop_bits);
- usart_parity_selection_config(comPORT, parity);
- usart_enable(comPORT, TRUE);
- nvic_irq_set(COM_IRQn, 0x06, 1);
- com_fun_init(comMode);
- com_rx_enable(TRUE);
- UART_TX_EN();
- }
下面附上工程源码，有兴趣的小伙伴可以下载测试：
AT32F423_EVAL-LED.rar
(4.54 MB, 下载次数: 8)
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