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https://github.com/OpenEPaperLink/OpenEPaperLink.git
synced 2026-03-21 03:04:25 +01:00
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
#include "asmUtil.h"
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#include "flash.h"
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#include "timer.h"
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#include "adc.h"
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#include "cpu.h"
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static volatile uint8_t __xdata mTempRet[4];
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void TEMP_ISR(void) __interrupt (10)
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{
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uint8_t i;
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i = CFGPAGE;
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CFGPAGE = 4;
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mTempRet[0] = TEMPRETH;
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mTempRet[1] = TEMPRETL;
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CFGPAGE = i;
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IEN1 &=~ 0x10;
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}
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int8_t adcSampleTemperature(void)
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{
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uint16_t sum = 0;
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uint8_t i;
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CLKEN |= 0x80;
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//adcConfig
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i = CFGPAGE;
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CFGPAGE = 4;
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TEMPCFG = 0x81; //0x08 set when done
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TEMPCAL2 = 0x22;
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TEMPCAL1 = 0x55;
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TEMPCAL4 = 0;
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TEMPCAL3 = 0;
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TEMPCAL6 = 3;
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TEMPCAL5 = 0xff;
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TEMPCFG &=~ 0x08;
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CFGPAGE = i;
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IEN1 &=~ 0x10;
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//adcConfig over
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/*
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TEMPCAL2: (seemingly analog settings: gain + ???)
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removing 0x02 lowers vals a little (9%) \__ these stack just as you'd expect
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setting 0x04 moves the values up a bit (18%) /
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setting 0x08 adds 2.5% or so
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0x30 is ADC gain/bitness. (x4 for each increment)
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0x80 seems to make no difference
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TEMPCAL1: (seemingly analog settings)
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removing 1 decreases value by 5.7% \__ these stack
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removing 4 decreases by 22% /
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removing 0x10 increments value by 1%
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removnig 0x40 increases by 5%
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using 0xaa increases width but decreases average
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other TEMPCALx values seem to have no effect
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*/
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for (i = 0; i < 9; i++) {
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//int on
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IEN1 |= 0x10;
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//wait for it to self-turn-off
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while (IEN1 & 0x10);
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if (i) { //skip first
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sum += ((uint16_t)mathPrvU8bitswap(mTempRet[0])) << 2;
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if (mTempRet[1] & 1)
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sum += 2;
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if (mTempRet[1] & 2)
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sum += 1;
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}
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timerDelay(TIMER_TICKS_PER_SECOND / 10000);
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}
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//turn it off
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CLKEN &=~ 0x80;
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//reuse tempRet to get calib data
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if (!flashRead(FLASH_INFOPAGE_ADDR + 0x0b, mTempRet, 4) || (mTempRet[0] == 0xff && mTempRet[1] == 0xff) || (mTempRet[2] == 0xff && mTempRet[3] == 0xff)) {
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//no calibration data - reporting 20 degrees, same as stock firmware
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return 20;
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}
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else {
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uint16_t __xdata valB = mathPrvU16from2xU8(mTempRet[0], mTempRet[1]); //temp sensor reading at 30 degrees C
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uint16_t __xdata valD = mathPrvU16from2xU8(mTempRet[2], mTempRet[3]); //temp sensor reading at 45 degrees C
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uint16_t __xdata slope = valD - valB;
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sum = (sum + 4) / 8; //average it
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//we can get 1/10 degree accuracy as this is well calibrated, but our api only need degrees so let's do that
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/*
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//high-precision code is this:
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if (sum > valB) //our math routines are unsigned
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temp = (uint16_t)mathPrvDiv32x16(mathPrvMul16x16(sum - valB, 150) + (slope / 2), slope) + 300;
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else
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temp = 300 - (uint16_t)mathPrvDiv32x16(mathPrvMul16x16(valB - sum, 150) + (slope / 2), slope);
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*/
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if (sum > valB) //our math routines are unsigned
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return mathPrvDiv16x8(5 + (uint16_t)mathPrvDiv32x16(mathPrvMul16x16(sum - valB, 150) + (slope / 2), slope), 10) + 30;
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else
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return 30 - mathPrvDiv16x8(5 + (uint16_t)mathPrvDiv32x16(mathPrvMul16x16(valB - sum, 150) + (slope / 2), slope), 10);
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}
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} |