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====== ATS Mini Stuff ======
Got mine 2026/07/08, AMNVOLT ATS MINI V4 metal shell version. Allegedly V4b according to Amazon listing.

===== Firmware =====
  * [[https://github.com/ralphxavier/SI4735|SI4735 by Ralph Xavier]] - as far as I can tell this is the most OG of all firmware, although it is not compatible with the ATS MINI units...?
  * [[https://oshwhub.com/sunnygold/esp32s3-si4732-shou-yin-ji|Sunnygold firmware]] - based on the above, modified by the original developer of these units
  * [[https://github.com/pu2clr/SI4735|PU2CLR SI4735 library]]
  * [[https://github.com/goshante/ats20_ats_ex|ats20_ats_ex]]
  * [[https://github.com/G8PTN/ATS_MINI|G8PTN ATS_MINI]] - based on the Sunnygold and Goshante firmware
  * [[https://github.com/esp32-si4732/ats-mini|ats-mini by Max Arnold]] - based on the above
  * [[http://www.hjberndt.de/dvb/pocketSI4735DualCoreDecoder.html|H.-J. Berndt firmware]] - closed source, boo!
Some of the info about the lineage of the various firmware projects here may be incorrect.

Mine came with v2.33 of the Max Arnold firmware.

===== MCU Info =====
==== read_flash_status ====
<code>
Serial port /dev/ttyACM0
Connecting...
Detecting chip type... ESP32-S3
Chip is ESP32-S3 (QFN56) (revision v0.2)
Features: WiFi, BLE, Embedded PSRAM 8MB (AP_3v3)
Crystal is 40MHz
USB mode: USB-Serial/JTAG
MAC: e0:72:a1:af:34:d8
Uploading stub...
Running stub...
Stub running...
Status value: 0x0200
</code>

==== espefuse dump ====
<code>
BLOCK0          (                ) [0 ] dump: 00000000 00000000 0000d1f5 00000000 00000100 00000000
MAC_SPI_8M_0    (BLOCK1          ) [1 ] dump: a1af34d8 0000e072 00000000 03080000 18788ac8 6400b87c
BLOCK_SYS_DATA  (BLOCK2          ) [2 ] dump: 89c20cbd 42532af3 a91f7bd0 c760f659 cceb7941 354444bc 9caeb0fa 3756c8b2
BLOCK_USR_DATA  (BLOCK3          ) [3 ] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BLOCK_KEY0      (BLOCK4          ) [4 ] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BLOCK_KEY1      (BLOCK5          ) [5 ] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BLOCK_KEY2      (BLOCK6          ) [6 ] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BLOCK_KEY3      (BLOCK7          ) [7 ] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BLOCK_KEY4      (BLOCK8          ) [8 ] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BLOCK_KEY5      (BLOCK9          ) [9 ] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
BLOCK_SYS_DATA2 (BLOCK10         ) [10] dump: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
</code>

==== espefuse summary ====
<code>
EFUSE_NAME (Block) Description  = [Meaningful Value] [Readable/Writeable] (Hex Value)
----------------------------------------------------------------------------------------
Calibration fuses:
K_RTC_LDO (BLOCK1)                                 BLOCK1 K_RTC_LDO                                   = -16 R/W (0b1000100)
K_DIG_LDO (BLOCK1)                                 BLOCK1 K_DIG_LDO                                   = 28 R/W (0b0000111)
V_RTC_DBIAS20 (BLOCK1)                             BLOCK1 voltage of rtc dbias20                      = -12 R/W (0x83)
V_DIG_DBIAS20 (BLOCK1)                             BLOCK1 voltage of digital dbias20                  = 60 R/W (0x0f)
DIG_DBIAS_HVT (BLOCK1)                             BLOCK1 digital dbias when hvt                      = -28 R/W (0b10111)
ADC2_CAL_VOL_ATTEN3 (BLOCK1)                       ADC2 calibration voltage at atten3                 = 100 R/W (0b011001)
TEMP_CALIB (BLOCK2)                                Temperature calibration data                       = -14.8 R/W (0b110010100)
OCODE (BLOCK2)                                     ADC OCode                                          = 91 R/W (0x5b)
ADC1_INIT_CODE_ATTEN0 (BLOCK2)                     ADC1 init code at atten0                           = 412 R/W (0x67)
ADC1_INIT_CODE_ATTEN1 (BLOCK2)                     ADC1 init code at atten1                           = -24 R/W (0b100110)
ADC1_INIT_CODE_ATTEN2 (BLOCK2)                     ADC1 init code at atten2                           = 92 R/W (0b010111)
ADC1_INIT_CODE_ATTEN3 (BLOCK2)                     ADC1 init code at atten3                           = -8 R/W (0b100010)
ADC2_INIT_CODE_ATTEN0 (BLOCK2)                     ADC2 init code at atten0                           = -32 R/W (0x88)
ADC2_INIT_CODE_ATTEN1 (BLOCK2)                     ADC2 init code at atten1                           = -40 R/W (0b101010)
ADC2_INIT_CODE_ATTEN2 (BLOCK2)                     ADC2 init code at atten2                           = 68 R/W (0b010001)
ADC2_INIT_CODE_ATTEN3 (BLOCK2)                     ADC2 init code at atten3                           = 124 R/W (0b011111)
ADC1_CAL_VOL_ATTEN0 (BLOCK2)                       ADC1 calibration voltage at atten0                 = 352 R/W (0x58)
ADC1_CAL_VOL_ATTEN1 (BLOCK2)                       ADC1 calibration voltage at atten1                 = 348 R/W (0x57)
ADC1_CAL_VOL_ATTEN2 (BLOCK2)                       ADC1 calibration voltage at atten2                 = 312 R/W (0x4e)
ADC1_CAL_VOL_ATTEN3 (BLOCK2)                       ADC1 calibration voltage at atten3                 = 356 R/W (0x59)
ADC2_CAL_VOL_ATTEN0 (BLOCK2)                       ADC2 calibration voltage at atten0                 = 400 R/W (0x64)
ADC2_CAL_VOL_ATTEN1 (BLOCK2)                       ADC2 calibration voltage at atten1                 = 172 R/W (0b0101011)
ADC2_CAL_VOL_ATTEN2 (BLOCK2)                       ADC2 calibration voltage at atten2                 = 220 R/W (0b0110111)

Config fuses:
WR_DIS (BLOCK0)                                    Disable programming of individual eFuses           = 0 R/W (0x00000000)
RD_DIS (BLOCK0)                                    Disable reading from BlOCK4-10                     = 0 R/W (0b0000000)
DIS_ICACHE (BLOCK0)                                Set this bit to disable Icache                     = False R/W (0b0)
DIS_DCACHE (BLOCK0)                                Set this bit to disable Dcache                     = False R/W (0b0)
DIS_TWAI (BLOCK0)                                  Set this bit to disable CAN function               = False R/W (0b0)
DIS_APP_CPU (BLOCK0)                               Disable app cpu                                    = False R/W (0b0)
DIS_DIRECT_BOOT (BLOCK0)                           Disable direct boot mode                           = False R/W (0b0)
UART_PRINT_CONTROL (BLOCK0)                        Set the default UART boot message output mode      = Enable R/W (0b00)
PIN_POWER_SELECTION (BLOCK0)                       Set default power supply for GPIO33-GPIO37; set wh = VDD_SPI R/W (0b1)
                                                   en SPI flash is initialized                       
PSRAM_CAP (BLOCK1)                                 PSRAM capacity                                     = 8M R/W (0b01)
PSRAM_TEMP (BLOCK1)                                PSRAM temperature                                  = 85C R/W (0b10)
PSRAM_VENDOR (BLOCK1)                              PSRAM vendor                                       = AP_3v3 R/W (0b01)
PSRAM_CAP_3 (BLOCK1)                               PSRAM capacity bit 3                               = False R/W (0b0)
BLOCK_USR_DATA (BLOCK3)                            User data                                         
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 
BLOCK_SYS_DATA2 (BLOCK10)                          System data part 2 (reserved)                     
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 

Flash fuses:
FLASH_TPUW (BLOCK0)                                Configures flash waiting time after power-up; in u = 0 R/W (0x0)
                                                   nit of ms. If the value is less than 15; the waiti
                                                   ng time is the configurable value.  Otherwise; the
                                                    waiting time is twice the configurable value     
FLASH_ECC_MODE (BLOCK0)                            Flash ECC mode in ROM                              = 16to18 byte R/W (0b0)
FLASH_TYPE (BLOCK0)                                SPI flash type                                     = 4 data lines R/W (0b0)
FLASH_PAGE_SIZE (BLOCK0)                           Set Flash page size                                = 0 R/W (0b00)
FLASH_ECC_EN (BLOCK0)                              Set 1 to enable ECC for flash boot                 = False R/W (0b0)
FORCE_SEND_RESUME (BLOCK0)                         Set this bit to force ROM code to send a resume co = False R/W (0b0)
                                                   mmand during SPI boot                             
FLASH_CAP (BLOCK1)                                 Flash capacity                                     = None R/W (0b000)
FLASH_TEMP (BLOCK1)                                Flash temperature                                  = None R/W (0b00)
FLASH_VENDOR (BLOCK1)                              Flash vendor                                       = None R/W (0b000)

Identity fuses:
DISABLE_WAFER_VERSION_MAJOR (BLOCK0)               Disables check of wafer version major              = False R/W (0b0)
DISABLE_BLK_VERSION_MAJOR (BLOCK0)                 Disables check of blk version major                = False R/W (0b0)
WAFER_VERSION_MINOR_LO (BLOCK1)                    WAFER_VERSION_MINOR least significant bits         = 2 R/W (0b010)
PKG_VERSION (BLOCK1)                               Package version                                    = 0 R/W (0b000)
BLK_VERSION_MINOR (BLOCK1)                         BLK_VERSION_MINOR                                  = 3 R/W (0b011)
WAFER_VERSION_MINOR_HI (BLOCK1)                    WAFER_VERSION_MINOR most significant bit           = False R/W (0b0)
WAFER_VERSION_MAJOR (BLOCK1)                       WAFER_VERSION_MAJOR                                = 0 R/W (0b00)
OPTIONAL_UNIQUE_ID (BLOCK2)                        Optional unique 128-bit ID                        
   = bd 0c c2 89 f3 2a 53 42 d0 7b 1f a9 59 f6 60 c7 R/W 
BLK_VERSION_MAJOR (BLOCK2)                         BLK_VERSION_MAJOR of BLOCK2                        = ADC calib V1 R/W (0b01)
WAFER_VERSION_MINOR (BLOCK0)                       calc WAFER VERSION MINOR = WAFER_VERSION_MINOR_HI  = 2 R/W (0x2)
                                                   << 3 + WAFER_VERSION_MINOR_LO (read only)         
PSRAM_CAPACITY (BLOCK0)                            calc as = PSRAM_CAP_3 << 2 + PSRAM_CAP (read only) = 1 R/W (0b001)

Jtag fuses:
SOFT_DIS_JTAG (BLOCK0)                             Set these bits to disable JTAG in the soft way (od = 0 R/W (0b000)
                                                   d number 1 means disable ). JTAG can be enabled in
                                                    HMAC module                                      
DIS_PAD_JTAG (BLOCK0)                              Set this bit to disable JTAG in the hard way. JTAG = False R/W (0b0)
                                                    is disabled permanently                          
STRAP_JTAG_SEL (BLOCK0)                            Set this bit to enable selection between usb_to_jt = False R/W (0b0)
                                                   ag and pad_to_jtag through strapping gpio3 when bo
                                                   th reg_dis_usb_jtag and reg_dis_pad_jtag are equal
                                                    to 0                                             

Mac fuses:
MAC (BLOCK1)                                       MAC address                                       
   = e0:72:a1:af:34:d8 (OK) R/W 
CUSTOM_MAC (BLOCK3)                                Custom MAC                                        
   = 00:00:00:00:00:00 (OK) R/W 

Security fuses:
DIS_DOWNLOAD_ICACHE (BLOCK0)                       Set this bit to disable Icache in download mode (b = False R/W (0b0)
                                                   oot_mode[3:0] is 0; 1; 2; 3; 6; 7)                
DIS_DOWNLOAD_DCACHE (BLOCK0)                       Set this bit to disable Dcache in download mode (  = False R/W (0b0)
                                                   boot_mode[3:0] is 0; 1; 2; 3; 6; 7)               
DIS_FORCE_DOWNLOAD (BLOCK0)                        Set this bit to disable the function that forces c = False R/W (0b0)
                                                   hip into download mode                            
DIS_DOWNLOAD_MANUAL_ENCRYPT (BLOCK0)               Set this bit to disable flash encryption when in d = False R/W (0b0)
                                                   ownload boot modes                                
SPI_BOOT_CRYPT_CNT (BLOCK0)                        Enables flash encryption when 1 or 3 bits are set  = Disable R/W (0b000)
                                                   and disabled otherwise                            
SECURE_BOOT_KEY_REVOKE0 (BLOCK0)                   Revoke 1st secure boot key                         = False R/W (0b0)
SECURE_BOOT_KEY_REVOKE1 (BLOCK0)                   Revoke 2nd secure boot key                         = False R/W (0b0)
SECURE_BOOT_KEY_REVOKE2 (BLOCK0)                   Revoke 3rd secure boot key                         = False R/W (0b0)
KEY_PURPOSE_0 (BLOCK0)                             Purpose of Key0                                    = USER R/W (0x0)
KEY_PURPOSE_1 (BLOCK0)                             Purpose of Key1                                    = USER R/W (0x0)
KEY_PURPOSE_2 (BLOCK0)                             Purpose of Key2                                    = USER R/W (0x0)
KEY_PURPOSE_3 (BLOCK0)                             Purpose of Key3                                    = USER R/W (0x0)
KEY_PURPOSE_4 (BLOCK0)                             Purpose of Key4                                    = USER R/W (0x0)
KEY_PURPOSE_5 (BLOCK0)                             Purpose of Key5                                    = USER R/W (0x0)
SECURE_BOOT_EN (BLOCK0)                            Set this bit to enable secure boot                 = False R/W (0b0)
SECURE_BOOT_AGGRESSIVE_REVOKE (BLOCK0)             Set this bit to enable revoking aggressive secure  = False R/W (0b0)
                                                   boot                                              
DIS_DOWNLOAD_MODE (BLOCK0)                         Set this bit to disable download mode (boot_mode[3 = False R/W (0b0)
                                                   :0] = 0; 1; 2; 3; 6; 7)                           
ENABLE_SECURITY_DOWNLOAD (BLOCK0)                  Set this bit to enable secure UART download mode   = False R/W (0b0)
SECURE_VERSION (BLOCK0)                            Secure version (used by ESP-IDF anti-rollback feat = 0 R/W (0x0000)
                                                   ure)                                              
BLOCK_KEY0 (BLOCK4)
  Purpose: USER
               Key0 or user data                                 
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 
BLOCK_KEY1 (BLOCK5)
  Purpose: USER
               Key1 or user data                                 
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 
BLOCK_KEY2 (BLOCK6)
  Purpose: USER
               Key2 or user data                                 
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 
BLOCK_KEY3 (BLOCK7)
  Purpose: USER
               Key3 or user data                                 
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 
BLOCK_KEY4 (BLOCK8)
  Purpose: USER
               Key4 or user data                                 
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 
BLOCK_KEY5 (BLOCK9)
  Purpose: USER
               Key5 or user data                                 
   = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W 

Spi Pad fuses:
SPI_PAD_CONFIG_CLK (BLOCK1)                        SPI_PAD_configure CLK                              = 0 R/W (0b000000)
SPI_PAD_CONFIG_Q (BLOCK1)                          SPI_PAD_configure Q(D1)                            = 0 R/W (0b000000)
SPI_PAD_CONFIG_D (BLOCK1)                          SPI_PAD_configure D(D0)                            = 0 R/W (0b000000)
SPI_PAD_CONFIG_CS (BLOCK1)                         SPI_PAD_configure CS                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_HD (BLOCK1)                         SPI_PAD_configure HD(D3)                           = 0 R/W (0b000000)
SPI_PAD_CONFIG_WP (BLOCK1)                         SPI_PAD_configure WP(D2)                           = 0 R/W (0b000000)
SPI_PAD_CONFIG_DQS (BLOCK1)                        SPI_PAD_configure DQS                              = 0 R/W (0b000000)
SPI_PAD_CONFIG_D4 (BLOCK1)                         SPI_PAD_configure D4                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_D5 (BLOCK1)                         SPI_PAD_configure D5                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_D6 (BLOCK1)                         SPI_PAD_configure D6                               = 0 R/W (0b000000)
SPI_PAD_CONFIG_D7 (BLOCK1)                         SPI_PAD_configure D7                               = 0 R/W (0b000000)

Usb fuses:
DIS_USB_OTG (BLOCK0)                               Set this bit to disable USB function               = False R/W (0b0)
USB_EXCHG_PINS (BLOCK0)                            Set this bit to exchange USB D+ and D- pins        = False R/W (0b0)
USB_EXT_PHY_ENABLE (BLOCK0)                        Set this bit to enable external PHY                = False R/W (0b0)
DIS_USB_JTAG (BLOCK0)                              Set this bit to disable function of usb switch to  = False R/W (0b0)
                                                   jtag in module of usb device                      
DIS_USB_SERIAL_JTAG (BLOCK0)                       Set this bit to disable usb device                 = False R/W (0b0)
USB_PHY_SEL (BLOCK0)                               This bit is used to switch internal PHY and extern
   = internal PHY is assigned to USB Device while external PHY is assigned to USB OTG R/W (0b0)
                                                   al PHY for USB OTG and USB Device                 
DIS_USB_SERIAL_JTAG_ROM_PRINT (BLOCK0)             USB printing                                       = Enable R/W (0b0)
DIS_USB_SERIAL_JTAG_DOWNLOAD_MODE (BLOCK0)         Set this bit to disable UART download mode through = False R/W (0b0)
                                                    USB                                              
DIS_USB_OTG_DOWNLOAD_MODE (BLOCK0)                 Set this bit to disable download through USB-OTG   = False R/W (0b0)

Vdd fuses:
VDD_SPI_XPD (BLOCK0)                               SPI regulator power up signal                      = True R/W (0b1)
VDD_SPI_TIEH (BLOCK0)                              If VDD_SPI_FORCE is 1; determines VDD_SPI voltage 
   = VDD_SPI connects to VDD3P3_RTC_IO R/W (0b1)
VDD_SPI_FORCE (BLOCK0)                             Set this bit and force to use the configuration of = True R/W (0b1)
                                                    eFuse to configure VDD_SPI                       

Wdt fuses:
WDT_DELAY_SEL (BLOCK0)                             RTC watchdog timeout threshold; in unit of slow cl = 40000 R/W (0b00)
                                                   ock cycle                                         

Flash voltage (VDD_SPI) set to 3.3V by efuse.
</code>

===== Audio Readback =====
V4b units have the audio output (speaker, not headphones, see below!) connected to ESP IO11.

From what I gather, this was originally a common mod (popularized by the H.-J. Berndt firmware?) which was then integrated into the V4b production PCBs. This is connected somewhere around the speaker PA - not sure if before or after the amp, although presumably before, since the amp should be able to swing up to VCC_BAT which can be over 3.3v. As such, it is **not usable** when headphones are plugged in, as the headphone jack switch interrupts the signal to the speaker PA*

*TODO: Need to verify this on V4b since it has a headphone amp which is not present on the original. The mechanism by which the speaker is disabled may be different. Regardless it is still not usable when headphones are plugged in on V4b

===== Headphone Amp =====
LM4809

===== FM Stereo =====
Why is the sound mono despite having a strong signal with the stereo indicator lit?

Not a hardware fault, the two discrete paths from tuner -> HPA -> headphone jack are fine.

Seems default FM stereo blend settings on tuner are much too conservative. Needs further experimentation.

===== Files =====

{{ :atsmini:atsmini.bin |V4b stock firmware entire flash dump}}