我正在处理一个有点棘手的硬件...例如,它的32位寄存器看起来像这样(上16位为零)
#define MASK_DBG_CTRL_FIFO_SPLIT 0b0000000000000001
#define MASK_DBG_CTRL_FIFO_ENABLE 0b0000000000000010
#define MASK_DBG_CTRL_ADC_SPLIT 0b0000000000000100
#define MASK_DBG_CTRL_ADC_ENABLE 0b0000000000001000
#define MASK_DBG_CTRL_MAX_COUNTER 0b1111111111110000
#define NO_SPLIT 0
#define WITH_SPLIT 1
#define DISABLE 0
#define ENABLE 1
我的问题是,如何生成需要写入此寄存器的数字。例如。我将拥有一个从用户获取数字的函数,并返回准备写入注册的值。
这似乎是一个非常痛苦的过程...我有十几个具有不同位宽度和东西的类似寄存器...我如何使这更容易?
对于一个人,我如何在MASK_DBG_CTRL_MAX_COUNTER
位写一个理想的值?
uint32_t generateDebugRegister(uint8_t fifoSplit, uint8_t fifoEnable,
uint8_t adcSplit, uint8_t adcEnable,
uint16_t counter) {
uint32_t output = 0;
switch(fifoSplit) {
case NO_SPLIT:
//do nothing;
break;
case WITH_SPLIT:
output = 1UL >> 1; //set bit 0 to 1
break;
}
switch(fifoEnable) {
case DISABLE:
//do nothing;
break;
case ENABLE:
output = 1UL >> 2; //set bit 2 to 1
break;
}
switch(adcSplit) {
case NO_SPLIT:
//do nothing;
break;
case WITH_SPLIT:
output = 1UL >> 3; //set bit 3 to 1
break;
}
switch(adcEnable) {
case DISABLE:
//do nothing;
break;
case ENABLE:
output = 1UL >> 4; //set bit 4 to 1
break;
}
//how to evenset the counter value???
return output;
}
呼叫功能的示例:
void setDebugRegister(uint32_t value) { /*write to reg*/ };
uint32_t toWrite = generateDebugRegister(NO_SPLIT, DISABLE, WITH_SPLIT, ENABLE, 4256);
setDebugRegister( toWrite);
这是另一套寄存器面具...在这里,我将其设置为插入两个5位的低10位:
#define MASK_DAD_NUM_ADDR 0b0000000000011111
#define MASK_DAD_NUM_DECI 0b0000001111100000
在这里,前8位和低8位:
#define MASK_DBG_REG_ID 0b1111111100000000;
#define MASK_DBG_REG_CNTR 0b0000000011111111;
如何使用预定的蒙版(?)
生成值
解决OP的第一部分:
考虑函数签名的重写。下面建议的其他建议更改为注释代码。
// uint32_t generateDebugRegister(uint8_t fifoSplit, uint8_t fifoEnable,
// uint8_t adcSplit, uint8_t adcEnable, uint16_t counter) { ...
// use bool for simple T/F values
uint32_t generateDebugRegister(bool fifoSplit, bool fifoEnable, bool adcSplit,
bool adcEnable, uint16_t counter) {
uint32_t output = 0;
if (fifoSplit == WITH_SPLIT) { // use an `if()`
output |= MASK_DBG_CTRL_FIFO_SPLIT; // use an 'or' of the mask
}
if (fifoEnable == ENABLE) {
output |= MASK_DBG_CTRL_FIFO_ENABLE;
}
.... // like-wise with adcSplit, adcEnable
// add an `offset` to simplify shifting needs
#define MASK_DBG_CTRL_MAX_BIT_OFFSET 4
#define MASK_DBG_CTRL_MAX_MAX (MASK_DBG_CTRL_MAX_COUNTER >> MASK_DBG_CTRL_MAX_BIT_OFFSET)
// test, since 16 bits do not fit in 12
if (counter > MASK_DBG_CTRL_MAX_MAX) {
Handle_error_with_TBD_Code();
}
else {
output |= (uint32_t)counter << MASK_DBG_CTRL_MAX_BIT_OFFSET;
}
return out;
}
我有十几个类似的寄存器,这些寄存器具有不同的位宽度和东西...我该如何使这更容易?
需要查看其中的一些,以获得一个很好的一般答案。