void adc_test(void)
{
unsigned char i;
unsigned char n;
unsigned char tail;
short int res_voltage = 0;
short int temp_voltage = 0;
uint16 temp_adc = 0;
float pvoltage = 0;
adc_switch_channel(VOLTAGE);
for(i = 0; i < 50; i++)
{
START_ADC();
temp_adc += adc_result;
}
n = min(adc_mean_num, adc_queue.count); // 取当前队列中数据个数与设置值的最小值
if(0 == n)
return;
tail = adc_queue.tail; // 获取队列尾部下标
tail = (tail-1) & ADC_MAX_SIZE_MASK; // 减1之后,指向最后加入的一个数据
// 减1是因为下标是从0开始的
for(i = 0; i < n; i++)
{
temp_voltage = adc_queue.data[tail].voltage;
res_voltage += temp_voltage;
tail = (tail-1) & ADC_MAX_SIZE_MASK;
}
pvoltage = 5.0f * res_voltage / n / 1024.0f;
uart_putnstring((uint8 *)&pvoltage, 4);
OSTimeDly(OS_TICKS_PER_SEC/2);
}
void adc_convert_start(void)
{
adc_status_flag.is_current_convert = TRUE;
adc_status_flag.is_first_time = TRUE;
adc_switch_channel(ADC_VOLTAGE);
START_ADC();
}
void adc_convert_start(void)
{
memset(&adc_status, 0, sizeof(AdcStatusFlag));
adc_status.who_is_convert = CURRENT; // 置位电流转换，先电流后电压顺序
adc_status.first_time = TRUE; // 第一次转换
adc_switch_channel(CURRENT); // 切换到电流转换
START_ADC(); // 启动一次转换（没有采用连续转换）
}
static irqreturn_t adcdone_int_handler(int irq, void *dev_id)
{
struct adcdev_t *adcd = (struct adcdev_t *)dev_id;
unsigned int c = (*(adcd->adccon) >> 3) & 0x07;
unsigned int adcdata;
//printk(KERN_INFO"%s %d\n",__FUNCTION__,__LINE__);
/*共享中断，先判断是不是我们的设备产生了中断*/
if ((c != ch) ||(*(adcd->adcdata0) & (1 << 14)) )
return IRQ_NONE;
//printk(KERN_INFO"%s %d\n",__FUNCTION__,__LINE__);
/*AD convertion data, handling it*/
adcdata = *(adcd->adcdata0) & 0x3f;
printk(KERN_INFO"adcdata %d\n", adcdata);
START_ADC();
return IRQ_HANDLED;
}
static int __init my_adc_init(void)
{
int ret;
adcdev.base_addr = ioremap(S3C2440_ADC_BASE,0x20);
if (adcdev.base_addr == NULL)
{
printk(KERN_ERR "failed to remap register block\n");
return -ENOMEM;
}
adcdev.adccon = (volatile unsigned long *)(adcdev.base_addr);
adcdev.adctsc = (volatile unsigned long *)(adcdev.base_addr + 4);
adcdev.adcdata0 = (volatile unsigned long *)(adcdev.base_addr + 12);
adcdev.adc_clk = clk_get(NULL, "adc");
if (!adcdev.adc_clk)
{
printk(KERN_ERR "failed to get adc clock source\n");
return -ENOENT;
}
clk_enable(adcdev.adc_clk);
/* enable AD convertion */
*(adcdev.adctsc) = 0x00;
START_ADC();
ret = request_irq(IRQ_ADC, adcdone_int_handler, IRQF_SHARED, "adc", &adcdev);
if (ret)
{
iounmap(adcdev.base_addr);
return ret;
}
printk ("adc initialized\n");
return ret;
}
