colorchord/embedded8266/driver/adc.c

//I did not write this file, but I don't know where it came from.
//It was also heavily modified by me, Charles Lohr.  I personally
//renounce any copyright over this file, so all of my modifications
//are hereby placed into the public domain.

#include "ets_sys.h"
#include "osapi.h"

#include "driver/adc.h"

#define i2c_bbpll                           0x67
#define i2c_bbpll_en_audio_clock_out        4
#define i2c_bbpll_en_audio_clock_out_msb    7
#define i2c_bbpll_en_audio_clock_out_lsb    7
#define i2c_bbpll_hostid                    4
#define i2c_saradc                          0x6C
#define i2c_saradc_hostid                   2

#define i2c_saradc_en_test        0
#define i2c_saradc_en_test_msb    5
#define i2c_saradc_en_test_lsb    5

#define i2c_writeReg_Mask(block, host_id, reg_add, Msb, Lsb, indata) \
    rom_i2c_writeReg_Mask(block, host_id, reg_add, Msb, Lsb, indata)

#define i2c_readReg_Mask(block, host_id, reg_add, Msb, Lsb) \
    rom_i2c_readReg_Mask_(block, host_id, reg_add, Msb, Lsb)

#define i2c_writeReg_Mask_def(block, reg_add, indata) \
    i2c_writeReg_Mask(block, block##_hostid, reg_add, reg_add##_msb, reg_add##_lsb, indata)

#define i2c_readReg_Mask_def(block, reg_add) \
    i2c_readReg_Mask(block, block##_hostid, reg_add, reg_add##_msb, reg_add##_lsb)


void ICACHE_FLASH_ATTR hs_adc_start(void)
{
    i2c_writeReg_Mask_def(i2c_saradc, i2c_saradc_en_test, 1); //select test mux

    //PWDET_CAL_EN=0, PKDET_CAL_EN=0
    SET_PERI_REG_MASK(0x60000D5C, 0x200000);

    while (GET_PERI_REG_BITS(0x60000D50, 26, 24) > 0); //wait r_state == 0

    CLEAR_PERI_REG_MASK(0x60000D50, 0x02);    //force_en=0
    SET_PERI_REG_MASK(0x60000D50, 0x02);    //force_en=1
}

uint16 hs_adc_read(void)
{
    uint8 i;
    uint16 sardata[8];
	uint16_t sar_dout = 0;

    while (GET_PERI_REG_BITS(0x60000D50, 26, 24) > 0); //wait r_state == 0

    read_sar_dout(sardata);

    for (i = 0; i < 8; i++) {
        sar_dout += sardata[i];
    }

#ifdef OLDWAY_NEEDS_RESTART
    //tout = (sar_dout + 8) >> 4;   //tout is 10 bits fraction
// ??? Why does this exist ??? It didn't start commented out, but now that I did comment it, it still seems happy.
//    i2c_writeReg_Mask_def(i2c_saradc, i2c_saradc_en_test, 1); //select test mux
//    while (GET_PERI_REG_BITS(0x60000D50, 26, 24) > 0); //wait r_state == 0

//    CLEAR_PERI_REG_MASK(0x60000D5C, 0x200000);
 //   SET_PERI_REG_MASK(0x60000D60, 0x1);    //force_en=1
 //   CLEAR_PERI_REG_MASK(0x60000D60, 0x1);    //force_en=1
#else

	//Start reading a new sample.
    CLEAR_PERI_REG_MASK(0x60000D50, 0x02);    //force_en=0
    SET_PERI_REG_MASK(0x60000D50, 0x02);    //force_en=1
#endif

    return sar_dout;      //tout is 10 bits fraction
}