微處理器 - Allwinner F1C100S (荔枝派Nano) - C/C++ - 溫度量測

參考資料：
http://nano.lichee.pro/
https://mangopi.org/mangopi_r

據說這個溫度感測是在TP模組內


A20 TP_FIFOCS


A20 TP_TPR


A20 TEMP_DATA


程式如下：

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <time.h>

uint32_t push_it(uint32_t v)
{
    int r=0;
    int cc = 0;
    static uint32_t buf[32] = { 0 };

    for (cc = 0; cc < 31; cc++) {
        buf[cc] = buf[cc + 1];
    }
    buf[31] = v;

    r = 0;
    for (cc = 0; cc < 32; cc++) {
        r += buf[cc];
    }
    return (r >> 5);
}
 
int main(int argc, char* argv[])
{
    int fd = -1;
    uint8_t *mem = NULL;
    uint32_t *TP_TPR = NULL;
    uint32_t *TP_FIFOCS = NULL;
    uint32_t *TEMP_DATA = NULL;
    uint32_t *TP_CTRL_REG1 = NULL;

    fd = open("/dev/mem", O_RDWR);
    mem = mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0x1c24000);
    printf("mmap addr: %p\n", mem); 

    TP_TPR = (uint32_t*)&mem[0x818];
    TP_FIFOCS = (uint32_t*)&mem[0x814];
    TEMP_DATA = (uint32_t*)&mem[0x820];
    TP_CTRL_REG1 = (uint32_t*)&mem[0x804];

    *TP_CTRL_REG1 = (1 << 5);
    *TP_TPR = (1 << 16);
    while (1) {
        if (*TP_FIFOCS & (1 << 18)) {
            *TP_FIFOCS = 0xffffffff;
            printf("temp: %d\n", push_it(*TEMP_DATA));
        }
        usleep(300000);
    }
    munmap(mem, 4096);
    close(fd);
    return 0;
}