LoadProhibited Error with MAX30102 Driver

[tenshioxide]

Hi! I'm new to the ESP-IDF platform. I have an old driver for the MAX30102 sensor that was written for the STM32 series that I want to modify to work on the ESP32.

I've spent several days trying to fix a LoadProhibited error to no avail. I wrote two functions, max30102_read and max30102_read_fifo that use i2c_master API's to read/write. I created a global variable polling_num for debugging purposes. When polling_num reaches 2, the task hangs and the watchdog timer reboots the system. When I disabled the watchdog timer, polling_num goes to 3 then a LoadProhibited error occurs.

Would greatly appreciate help.

Code: [Select all] [Expand/Collapse]

1. void max30102_read_fifo(i2c_master_dev_handle_t *dev_handle)
2. {
3.     // First transaction: Get the FIFO_WR_PTR
4.     uint8_t wr_ptr = 0, rd_ptr = 0;
5.  
6.     max30102_read(dev_handle, MAX30102_FIFO_RD_PTR, &rd_ptr, 1);
7.     max30102_read(dev_handle, MAX30102_FIFO_WR_PTR, &wr_ptr, 1);
8.  
9.     vTaskDelay(pdMS_TO_TICKS(100));
10.  
11.     int8_t num_samples;
12.  
13.     printf("wr_ptr: %d, rd_ptr: %d\n", wr_ptr, rd_ptr);
14.  
15.     num_samples = (int8_t)wr_ptr - (int8_t)rd_ptr;
16.     if (num_samples < 1)
17.     {
18.         num_samples += 32;
19.     }
20.  
21.     // Second transaction: Read NUM_SAMPLES_TO_READ samples from the FIFO
22.     for (int8_t i = 0; i < num_samples; i++)
23.     {
24.         uint8_t sample[6];
25.         max30102_read(dev_handle, MAX30102_FIFO_DATA, sample, 6);
26.  
27.         uint32_t ir_sample = ((uint32_t)(sample[0] << 16) | (uint32_t)(sample[1] << 8) | (uint32_t)(sample[2])) & 0x3ffff;
28.         uint32_t red_sample = ((uint32_t)(sample[3] << 16) | (uint32_t)(sample[4] << 8) | (uint32_t)(sample[5])) & 0x3ffff;
29.         printf("%ld ", ir_sample);
30.     }
31.     printf("\n");
32. }

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Code: [Select all] [Expand/Collapse]

1. esp_err_t max30102_read(i2c_master_dev_handle_t *dev_handle, uint8_t reg, uint8_t *buf, uint16_t buflen)
2. {
3.     vTaskDelay(pdMS_TO_TICKS(10));
4.  
5.     uint8_t reg_addr = reg;
6.  
7.     // Transmit the register address over I2C
8.     esp_err_t res = i2c_master_transmit(*dev_handle, &reg_addr, 1, -1);
9.     if (res != ESP_OK) {
10.         printf("I2C write error: %s\n", esp_err_to_name(res));
11.         return res;
12.     }
13.  
14.     // Receive data from the I2C device
15.     res = i2c_master_receive(*dev_handle, buf, buflen, -1);
16.     res = ESP_OK;
17.     if (res != ESP_OK) {
18.         printf("I2C read error: %s\n", esp_err_to_name(res));
19.     }
20.  
21.     vTaskDelay(pdMS_TO_TICKS(10));
22.  
23.     return res;
24. }

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Code: [Select all] [Expand/Collapse]

1. rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
2. configsip: 0, SPIWP:0xee
3. clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
4. mode:DIO, clock div:2
5. load:0x3fff0030,len:7176
6. load:0x40078000,len:15564
7. ho 0 tail 12 room 4
8. load:0x40080400,len:4
9. --- 0x40080400: _init at ??:?
10.  
11. load:0x40080404,len:3904
12. entry 0x40080640
13. I (31) boot: ESP-IDF v5.3.1-244-g4d0db7045d 2nd stage bootloader
14. I (31) boot: compile time Sep 23 2024 22:36:41
15. I (33) boot: Multicore bootloader
16. I (37) boot: chip revision: v3.1
17. I (41) boot.esp32: SPI Speed      : 40MHz
18. I (45) boot.esp32: SPI Mode       : DIO
19. I (50) boot.esp32: SPI Flash Size : 2MB
20. I (54) boot: Enabling RNG early entropy source...
21. I (60) boot: Partition Table:
22. I (63) boot: ## Label            Usage          Type ST Offset   Length
23. I (71) boot:  0 nvs              WiFi data        01 02 00009000 00006000
24. I (78) boot:  1 phy_init         RF data          01 01 0000f000 00001000
25. I (86) boot:  2 factory          factory app      00 00 00010000 00100000
26. I (93) boot: End of partition table
27. I (97) esp_image: segment 0: paddr=00010020 vaddr=3f400020 size=0abbch ( 43964) map
28. I (121) esp_image: segment 1: paddr=0001abe4 vaddr=3ffb0000 size=02348h (  9032) load
29. I (124) esp_image: segment 2: paddr=0001cf34 vaddr=40080000 size=030e4h ( 12516) load
30. I (132) esp_image: segment 3: paddr=00020020 vaddr=400d0020 size=16e7ch ( 93820) map
31. I (167) esp_image: segment 4: paddr=00036ea4 vaddr=400830e4 size=09e40h ( 40512) load
32. I (190) boot: Loaded app from partition at offset 0x10000
33. I (190) boot: Disabling RNG early entropy source...
34. I (202) cpu_start: Multicore app
35. I (211) cpu_start: Pro cpu start user code
36. I (211) cpu_start: cpu freq: 160000000 Hz
37. I (211) app_init: Application information:
38. I (214) app_init: Project name:     hth-test-stuff
39. I (219) app_init: App version:      863dd75-dirty
40. I (224) app_init: Compile time:     Sep 23 2024 22:36:20
41. I (230) app_init: ELF file SHA256:  c12088eff...
42. I (236) app_init: ESP-IDF:          v5.3.1-244-g4d0db7045d
43. I (242) efuse_init: Min chip rev:     v0.0
44. I (247) efuse_init: Max chip rev:     v3.99
45. I (252) efuse_init: Chip rev:         v3.1
46. I (257) heap_init: Initializing. RAM available for dynamic allocation:
47. I (264) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
48. I (270) heap_init: At 3FFB2C10 len 0002D3F0 (180 KiB): DRAM
49. I (276) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
50. I (282) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
51. I (289) heap_init: At 4008CF24 len 000130DC (76 KiB): IRAM
52. I (296) spi_flash: detected chip: generic
53. I (300) spi_flash: flash io: dio
54. W (303) spi_flash: Detected size(4096k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
55. I (317) main_task: Started on CPU0
56. I (327) main_task: Calling app_main()
57. start of task
58. D (327) i2c.common: new bus(0) at 0x3ffaff70
59. I (327) gpio: GPIO[21]| InputEn: 1| OutputEn: 1| OpenDrain: 1| Pullup: 1| Pulldown: 0| Intr:0
60. I (337) gpio: GPIO[22]| InputEn: 1| OutputEn: 1| OpenDrain: 1| Pullup: 1| Pulldown: 0| Intr:0
61. D (347) i2c.common: bus clock source frequency: 80000000hz
62. W (347) i2c.master: Please note i2c asynchronous is only used for specific scenario currently. It's experimental for other users because user cannot get bus error from API. And It's not compatible with ``i2c_master_probe``. If user makes sure there won't be any error on bus and tested with no problem, this message can be ignored.
63. bus: ESP_OK
64. device: ESP_OK
65. led pulse width set
66. sampling rate set
67. Writing to register 0x0A with data 0x11
68. ADC resolution set successfully
69. adc resolution set
70. led current 1 set
71. led current 2 set
72. led mode set
73. fifo configured
74. done configuration
75. wr_ptr: 23, rd_ptr: 5
76. 122032 122026 122140 122033 122066 122126 122066 122036 122048 122051 122161 122045 122269 122059 122058 122180 122226 122011
77. polling_num: 1
78. wr_ptr: 26, rd_ptr: 22
79. 122075 122157 122177 122228
80. polling_num: 2
81. wr_ptr: 31, rd_ptr: 26
82. 122146 122042 122076 122039 122039
83. polling_num: 3
84. Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.
85.  
86. Core  0 register dump:
87. PC      : 0x400da203  PS      : 0x00060c30  A0      : 0x800d6278  A1      : 0x3ffb3df0
88. --- 0x400da203: i2c_master_transmit at C:/Users/benja/esp/v5.3/esp-idf/components/esp_driver_i2c/i2c_master.c:1073
89.  
90. A2      : 0x3ffb9258  A3      : 0x3ffb3e50  A4      : 0x00000001  A5      : 0xffffffff
91. A6      : 0x3ffb3d50  A7      : 0xff000000  A8      : 0x00000000  A9      : 0x00001800
92. A10     : 0x00000800  A11     : 0x00000000  A12     : 0x00000030  A13     : 0x3ffb3e30
93. A14     : 0x0000021a  A15     : 0x00000003  SAR     : 0x00000004  EXCCAUSE: 0x0000001c
94. EXCVADDR: 0x000000a1  LBEG    : 0x4000c46c  LEND    : 0x4000c477  LCOUNT  : 0x00000000
95. --- 0x4000c46c: memset in ROM
96. 0x4000c477: memset in ROM
97.  
98.  
99.  
100. Backtrace: 0x400da200:0x3ffb3df0 0x400d6275:0x3ffb3e50 0x400d6504:0x3ffb3e80 0x400d6671:0x3ffb3eb0 0x400e63e9:0x3ffb3f10 0x40086335:0x3ffb3f30
101. --- 0x400da200: i2c_master_transmit at C:/Users/benja/esp/v5.3/esp-idf/components/esp_driver_i2c/i2c_master.c:1067
102. 0x400d6275: max30102_read at C:/vscode-esp32-workspace/hth-test-stuff/main/main.c:61
103. 0x400d6504: max30102_read_fifo at C:/vscode-esp32-workspace/hth-test-stuff/main/main.c:221
104. 0x400d6671: app_main at C:/vscode-esp32-workspace/hth-test-stuff/main/main.c:49
105. 0x400e63e9: main_task at C:/Users/benja/esp/v5.3/esp-idf/components/freertos/app_startup.c:208
106. 0x40086335: vPortTaskWrapper at C:/Users/benja/esp/v5.3/esp-idf/components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c:134

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[MicroController]

Probably a corrput i2c_master_dev_handle_t *dev_handle. (There's no need to take a pointer to the i2c_master_dev_handle_t as argument, just take/pass the i2c_master_dev_handle_t by value.)

Can you show the code that 1) initializes the device handle and 2) calls max30102_read_fifo ()?

[tenshioxide]

Sure!

Code: [Select all] [Expand/Collapse]

1. void app_main(void)
2. {
3.     printf("start of task\n");
4.  
5.     i2c_master_bus_config_t i2c_bus_config = {
6.         .i2c_port = 0,
7.         .sda_io_num = SDA_GPIO,
8.         .scl_io_num = SCL_GPIO,
9.         .clk_source = I2C_CLK_SRC_DEFAULT,
10.         .glitch_ignore_cnt = 7,
11.         .intr_priority = 0,
12.         .trans_queue_depth = 100,
13.         .flags.enable_internal_pullup = true,
14.     };
15.  
16.     i2c_master_bus_handle_t i2c_bus_handle;
17.    
18.     esp_err_t res = ( i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle) ); // create master bus
19.     printf("bus: %s\n", esp_err_to_name(res));
20.  
21.     i2c_device_config_t i2c_max30102_config = {
22.         .dev_addr_length = I2C_ADDR_BIT_LEN_7,
23.         .device_address = ADDR, // max30102 i2c write address
24.         .scl_speed_hz = I2C_FREQ_HZ
25.     };
26.  
27.     i2c_master_dev_handle_t i2c_max30102_handle;
28.     esp_err_t res2 = ( i2c_master_bus_add_device(i2c_bus_handle, &i2c_max30102_config, &i2c_max30102_handle) ); // add max30102 to master bus as a slave device
29.     printf("device: %s\n", esp_err_to_name(res2));
30.  
31.     max30102_config(&i2c_max30102_handle);
32.  
33.     while (1) {
34.         vTaskDelay(pdMS_TO_TICKS(1000));
35.         polling_num++;  
36.         max30102_read_fifo(&i2c_max30102_handle);
37.         printf("polling_num: %ld\n", polling_num);
38.     }
39. }

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[tenshioxide]

I passed the handle by value instead of passing a pointer and I still run into the same issue. After further testing, it seems once the FIFO fills up with 32 samples and the ESP tries to read it the program crashes.

[MicroController]

Hmm. Can't find anything wrong in your code.
Yet there seems to be some memory corruption to be happening.
Maybe try increasing the main task's stack space by a kilobyte or two (via menuconfig).