我是嵌入式系统编程的新手,我只需要学习如何操作给定的c ++代码。
鉴于:
电机1映射到0x60000000
电机2映射到0x50000000
以下是当前32位寄存器的定义
REGISTER NAME | BYTE OFFSET | NOTES
----------------------------------------------------------------------
motor_interrupt 0x00 service interrupts
motor_status 0x01 enable on demand access to status elements
motor_command 0x02 enable command of the motor
REGISTER NAME | NAME | BITS | ACCESS TYPE | DESC
----------------------------------------------------------------------------------
motor_interrupt_register
CLOSED 0 R/W high when motor transitions to CLOSED position
OPEN 1 R/W high when motor transitions to OPEN position
RESERVED 2.31 N/A reserved for future use
motor_status
SPEED 0.2 R speed in counts/seconds
STATE 3 R current state of motor
POSITION 4.13 R current position of the motor
RESERVED 14.31 n/a reserved for future use
我发现很难看到使用给定的示例c ++代码,此时我所知道的是我需要访问register_name并设置它们的位来执行特定任务或读取寄存器名称以获取状态。
如果在c ++代码中使用它,我想我可以理解它。给定的是一个自动门系统(我没有写按钮细节)。我是否需要访问c ++中的register_name或byte_offset?
非常感谢您的帮助
答案 0 :(得分:1)
读取中断/状态寄存器的C / C ++示例:
volatile uint32_t * const motor1 = (uint32_t *)0x60000000; // base addresses for motors 1 and 2
volatile uint32_t * const motor2 = (uint32_t *)0x50000000;
enum // register offsets from base address
{
motor_interrupt, // 0x00 - service interrupts
motor_status, // 0x01 - enable on demand access to status elements
motor_command // 0x02 - enable command of the motor
}
// read status/interrupt registers
uint32_t current_int_1 = motor1[motor_interrupt];
uint32_t current_int_2 = motor2[motor_interrupt];
uint32_t current_status_1 = motor1[motor_status];
uint32_t current_status_2 = motor2[motor_status];
类似于将32位值写入命令寄存器:
motor1[motor_command] = 0x8000 | (0x12 << 6) | 0x01;
motor2[motor_command] = 0x0;