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this allows for finding the pinout of an unknown ESC
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| /* | ||
| bootloader for AM32 ESC firmware | ||
| based on https://github.com/AlkaMotors/AT32F421_AM32_Bootloader | ||
| */ | ||
| #include <main.h> | ||
| #include <stdio.h> | ||
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| #include <version.h> | ||
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| /* Includes ------------------------------------------------------------------*/ | ||
| #include <stdbool.h> | ||
| #include <stdio.h> | ||
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| #pragma GCC optimize("O0") | ||
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| #include <string.h> | ||
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| #define GPIO_PORT_TYPE gpio_type | ||
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| static GPIO_PORT_TYPE *input_port; | ||
| static uint32_t input_pin; | ||
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| #define MCU_FLASH_START 0x08000000 | ||
| #define FIRMWARE_RELATIVE_START 0x1000 | ||
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| #define BAUDRATE 19200 | ||
| #define BITTIME 52 // 1000000/BAUDRATE | ||
| #define HALFBITTIME 26 // 500000/BAUDRATE | ||
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| #include <blutil.h> | ||
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| static void setTransmit() | ||
| { | ||
| gpio_set(input_pin); | ||
| gpio_mode_set_output(input_pin, GPIO_OUTPUT_PUSH_PULL); | ||
| } | ||
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| static void delayMicroseconds(uint32_t micros) | ||
| { | ||
| while (micros > 0) { | ||
| uint32_t us = micros>10000?10000:micros; | ||
| bl_timer_reset(); | ||
| while (bl_timer_us() < us) ; | ||
| micros -= us; | ||
| } | ||
| } | ||
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| static void serialwriteChar(uint8_t data) | ||
| { | ||
| // start bit is low | ||
| gpio_clear(input_pin); | ||
| delayMicroseconds(BITTIME); | ||
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| // send data bits | ||
| uint8_t bits_written = 0; | ||
| while (bits_written < 8) { | ||
| if (data & 0x01) { | ||
| gpio_set(input_pin); | ||
| } else { | ||
| // GPIO_BC(input_port) = input_pin; | ||
| gpio_clear(input_pin); | ||
| } | ||
| bits_written++; | ||
| data = data >> 1; | ||
| delayMicroseconds(BITTIME); | ||
| } | ||
|
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| // send stop bit | ||
| gpio_set(input_pin); | ||
| delayMicroseconds(BITTIME); | ||
| } | ||
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| static void sendString(const uint8_t *data, int len) | ||
| { | ||
| for(int i = 0; i < len; i++){ | ||
| serialwriteChar(data[i]); | ||
| } | ||
| } | ||
|
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| #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0])) | ||
|
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| static bool is_debug(uint8_t portnum, uint32_t pin) { | ||
| return portnum == 0 && (pin == 13 || pin == 14); | ||
| } | ||
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| static struct { | ||
| const char *pname; | ||
| GPIO_PORT_TYPE *port; | ||
| } ports[] = { | ||
| { "PA", GPIOA }, | ||
| { "PB", GPIOB }, | ||
| }; | ||
|
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| static void pin_scanner(void) | ||
| { | ||
| for (uint8_t i=0; i< ARRAY_SIZE(ports); i++) { | ||
| for (uint8_t p=0; p< 16; p++) { | ||
| if (is_debug(i, p)) { | ||
| continue; | ||
| } | ||
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| for (uint8_t i2=0; i2< ARRAY_SIZE(ports); i2++) { | ||
| for (uint8_t p2=0; p2< 16; p2++) { | ||
| if (is_debug(i2, p2)) { | ||
| continue; | ||
| } | ||
|
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| input_port = ports[i].port; | ||
| input_pin = GPIO_PIN(p); | ||
|
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| /* | ||
| write the pin combination to the proposed signal pin | ||
| */ | ||
| char str[12]; | ||
| str[0] = '['; | ||
| strncpy(&str[1], ports[i].pname, sizeof(str)-1); | ||
| str[3] = '0' + (p / 10); | ||
| str[4] = '0' + (p % 10); | ||
| str[5] = ':'; | ||
| strncpy(&str[6], ports[i2].pname, sizeof(str)-6); | ||
| str[8] = '0' + (p2 / 10); | ||
| str[9] = '0' + (p2 % 10); | ||
| str[10] = ']'; | ||
| str[11] = 0; | ||
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| setTransmit(); | ||
| delayMicroseconds(200); | ||
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| sendString((const uint8_t *)str, strlen(str)); | ||
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| gpio_mode_set_input(input_pin, GPIO_PULL_NONE); | ||
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| delayMicroseconds(200); | ||
|
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| /* | ||
| oscillate the 2nd pin 10 times, 500us high, 1000us low | ||
| */ | ||
| input_port = ports[i2].port; | ||
| input_pin = GPIO_PIN(p2); | ||
| setTransmit(); | ||
| delayMicroseconds(200); | ||
| for (uint16_t c=0;c<10;c++) { | ||
| gpio_set(input_pin); | ||
| delayMicroseconds(500); | ||
| gpio_clear(input_pin); | ||
| delayMicroseconds(1000); | ||
| } | ||
| gpio_mode_set_input(input_pin, GPIO_PULL_NONE); | ||
| delayMicroseconds(1000); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| int main(void) | ||
| { | ||
| bl_clock_config(); | ||
| bl_timer_init(); | ||
|
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| // give time for debugger to attach | ||
| delayMicroseconds(3000000); | ||
|
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| // setup all as float input | ||
| for (uint8_t i=0; i< ARRAY_SIZE(ports); i++) { | ||
| for (uint8_t p=0; p< 16; p++) { | ||
| if (is_debug(i, p)) { | ||
| continue; | ||
| } | ||
| input_port = ports[i].port; | ||
| input_pin = GPIO_PIN(p); | ||
| bl_gpio_init(); | ||
| gpio_mode_set_input(input_pin, GPIO_PULL_NONE); | ||
| } | ||
| } | ||
|
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| while (true) { | ||
| pin_scanner(); | ||
| } | ||
| return 0; | ||
| } |