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micropython/ports/stm32/mboot/main.c
Damien George ceff433fcc stm32/mboot: Adjust user-reset-mode timeout so it ends with mode=1. 
If the user button is held down indefinitely (eg unintenionally, or because
the GPIO signal of the user button is connected to some external device)
then it makes sense to end the reset mode cycle with the default mode of
1, which executes code as normal.
2018-06-18 12:23:27 +10:00

1260 lines
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017-2018 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include "py/mphal.h"
#include "extmod/crypto-algorithms/sha256.c"
#include "usbd_core.h"
#include "storage.h"
#include "i2cslave.h"
// Using polling is about 10% faster than not using it (and using IRQ instead)
// This DFU code with polling runs in about 70% of the time of the ST bootloader
#define USE_USB_POLLING (1)
// Using cache probably won't make it faster because we run at 48MHz, and best
// to keep the MCU config as minimal as possible.
#define USE_CACHE (0)
// IRQ priorities (encoded values suitable for NVIC_SetPriority)
#define IRQ_PRI_SYSTICK (NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 0, 0))
#define IRQ_PRI_I2C (NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 1, 0))
// Configure PLL to give a 48MHz CPU freq
#define CORE_PLL_FREQ (48000000)
#undef MICROPY_HW_CLK_PLLM
#undef MICROPY_HW_CLK_PLLN
#undef MICROPY_HW_CLK_PLLP
#undef MICROPY_HW_CLK_PLLQ
#define MICROPY_HW_CLK_PLLM (HSE_VALUE / 1000000)
#define MICROPY_HW_CLK_PLLN (192)
#define MICROPY_HW_CLK_PLLP (RCC_PLLP_DIV4)
#define MICROPY_HW_CLK_PLLQ (4)
// Work out which USB device to use for the USB DFU interface
#if !defined(MICROPY_HW_USB_MAIN_DEV)
#if defined(MICROPY_HW_USB_FS)
#define MICROPY_HW_USB_MAIN_DEV (USB_PHY_FS_ID)
#elif defined(MICROPY_HW_USB_HS) && defined(MICROPY_HW_USB_HS_IN_FS)
#define MICROPY_HW_USB_MAIN_DEV (USB_PHY_HS_ID)
#else
#error Unable to determine proper MICROPY_HW_USB_MAIN_DEV to use
#endif
#endif
// These bits are used to detect valid application firmware at APPLICATION_ADDR
#define APP_VALIDITY_BITS (0x00000003)
#define MP_ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
static void do_reset(void);
static uint32_t get_le32(const uint8_t *b) {
return b[0] | b[1] << 8 | b[2] << 16 | b[3] << 24;
}
void mp_hal_delay_us(mp_uint_t usec) {
// use a busy loop for the delay
// sys freq is always a multiple of 2MHz, so division here won't lose precision
const uint32_t ucount = HAL_RCC_GetSysClockFreq() / 2000000 * usec / 2;
for (uint32_t count = 0; ++count <= ucount;) {
}
}
static volatile uint32_t systick_ms;
void mp_hal_delay_ms(mp_uint_t ms) {
if (__get_PRIMASK() == 0) {
// IRQs enabled, use systick
if (ms != 0 && ms != (mp_uint_t)-1) {
++ms; // account for the fact that systick_ms may roll over immediately
}
uint32_t start = systick_ms;
while (systick_ms - start < ms) {
__WFI();
}
} else {
// IRQs disabled, so need to use a busy loop for the delay.
// To prevent possible overflow of the counter we use a double loop.
const uint32_t count_1ms = 16000000 / 8000;
for (uint32_t i = 0; i < ms; i++) {
for (volatile uint32_t count = 0; ++count <= count_1ms;) {
}
}
}
}
// Needed by parts of the HAL
uint32_t HAL_GetTick(void) {
return systick_ms;
}
// Needed by parts of the HAL
void HAL_Delay(uint32_t ms) {
mp_hal_delay_ms(ms);
}
static void __fatal_error(const char *msg) {
NVIC_SystemReset();
for (;;) {
}
}
/******************************************************************************/
// CLOCK
#if defined(STM32F4) || defined(STM32F7)
#define CONFIG_RCC_CR_1ST (RCC_CR_HSION)
#define CONFIG_RCC_CR_2ND (RCC_CR_HSEON || RCC_CR_CSSON || RCC_CR_PLLON)
#define CONFIG_RCC_PLLCFGR (0x24003010)
#else
#error Unknown processor
#endif
void SystemInit(void) {
// Set HSION bit
RCC->CR |= CONFIG_RCC_CR_1ST;
// Reset CFGR register
RCC->CFGR = 0x00000000;
// Reset HSEON, CSSON and PLLON bits
RCC->CR &= ~CONFIG_RCC_CR_2ND;
// Reset PLLCFGR register
RCC->PLLCFGR = CONFIG_RCC_PLLCFGR;
// Reset HSEBYP bit
RCC->CR &= (uint32_t)0xFFFBFFFF;
// Disable all interrupts
RCC->CIR = 0x00000000;
// Set location of vector table
SCB->VTOR = FLASH_BASE;
// Enable 8-byte stack alignment for IRQ handlers, in accord with EABI
SCB->CCR |= SCB_CCR_STKALIGN_Msk;
}
void systick_init(void) {
// Configure SysTick as 1ms ticker
SysTick_Config(SystemCoreClock / 1000);
NVIC_SetPriority(SysTick_IRQn, IRQ_PRI_SYSTICK);
}
void SystemClock_Config(void) {
// This function assumes that HSI is used as the system clock (see RCC->CFGR, SWS bits)
// Enable Power Control clock
__HAL_RCC_PWR_CLK_ENABLE();
// Reduce power consumption
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
// Turn HSE on
__HAL_RCC_HSE_CONFIG(RCC_HSE_ON);
while (__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET) {
}
// Disable PLL
__HAL_RCC_PLL_DISABLE();
while (__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) != RESET) {
}
// Configure PLL factors and source
RCC->PLLCFGR =
1 << RCC_PLLCFGR_PLLSRC_Pos // HSE selected as PLL source
| MICROPY_HW_CLK_PLLM << RCC_PLLCFGR_PLLM_Pos
| MICROPY_HW_CLK_PLLN << RCC_PLLCFGR_PLLN_Pos
| ((MICROPY_HW_CLK_PLLP >> 1) - 1) << RCC_PLLCFGR_PLLP_Pos
| MICROPY_HW_CLK_PLLQ << RCC_PLLCFGR_PLLQ_Pos
#ifdef RCC_PLLCFGR_PLLR
| 2 << RCC_PLLCFGR_PLLR_Pos // default PLLR value of 2
#endif
;
// Enable PLL
__HAL_RCC_PLL_ENABLE();
while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET) {
}
#if !defined(MICROPY_HW_FLASH_LATENCY)
#define MICROPY_HW_FLASH_LATENCY FLASH_LATENCY_1
#endif
// Increase latency before changing clock
if (MICROPY_HW_FLASH_LATENCY > (FLASH->ACR & FLASH_ACR_LATENCY)) {
__HAL_FLASH_SET_LATENCY(MICROPY_HW_FLASH_LATENCY);
}
// Configure AHB divider
MODIFY_REG(RCC->CFGR, RCC_CFGR_HPRE, RCC_SYSCLK_DIV1);
// Configure SYSCLK source from PLL
__HAL_RCC_SYSCLK_CONFIG(RCC_SYSCLKSOURCE_PLLCLK);
while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_PLLCLK) {
}
// Decrease latency after changing clock
if (MICROPY_HW_FLASH_LATENCY < (FLASH->ACR & FLASH_ACR_LATENCY)) {
__HAL_FLASH_SET_LATENCY(MICROPY_HW_FLASH_LATENCY);
}
// Set APB clock dividers
MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE1, RCC_HCLK_DIV4);
MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE2, RCC_HCLK_DIV2 << 3);
// Update clock value and reconfigure systick now that the frequency changed
SystemCoreClock = CORE_PLL_FREQ;
systick_init();
#if defined(STM32F7)
// The DFU bootloader changes the clocksource register from its default power
// on reset value, so we set it back here, so the clocksources are the same
// whether we were started from DFU or from a power on reset.
RCC->DCKCFGR2 = 0;
#endif
}
// Needed by HAL_PCD_IRQHandler
uint32_t HAL_RCC_GetHCLKFreq(void) {
return SystemCoreClock;
}
/******************************************************************************/
// GPIO
void mp_hal_pin_config(mp_hal_pin_obj_t port_pin, uint32_t mode, uint32_t pull, uint32_t alt) {
GPIO_TypeDef *gpio = (GPIO_TypeDef*)(port_pin & ~0xf);
// Enable the GPIO peripheral clock
uint32_t en_bit = RCC_AHB1ENR_GPIOAEN_Pos + ((uintptr_t)gpio - GPIOA_BASE) / (GPIOB_BASE - GPIOA_BASE);
RCC->AHB1ENR |= 1 << en_bit;
volatile uint32_t tmp = RCC->AHB1ENR; // Delay after enabling clock
(void)tmp;
// Configure the pin
uint32_t pin = port_pin & 0xf;
gpio->MODER = (gpio->MODER & ~(3 << (2 * pin))) | ((mode & 3) << (2 * pin));
gpio->OTYPER = (gpio->OTYPER & ~(1 << pin)) | ((mode >> 2) << pin);
gpio->OSPEEDR = (gpio->OSPEEDR & ~(3 << (2 * pin))) | (2 << (2 * pin)); // full speed
gpio->PUPDR = (gpio->PUPDR & ~(3 << (2 * pin))) | (pull << (2 * pin));
gpio->AFR[pin >> 3] = (gpio->AFR[pin >> 3] & ~(15 << (4 * (pin & 7)))) | (alt << (4 * (pin & 7)));
}
void mp_hal_pin_config_speed(uint32_t port_pin, uint32_t speed) {
GPIO_TypeDef *gpio = (GPIO_TypeDef*)(port_pin & ~0xf);
uint32_t pin = port_pin & 0xf;
gpio->OSPEEDR = (gpio->OSPEEDR & ~(3 << (2 * pin))) | (speed << (2 * pin));
}
/******************************************************************************/
// LED
#define LED0 MICROPY_HW_LED1
#define LED1 MICROPY_HW_LED2
#define LED2 MICROPY_HW_LED3
void led_init(void) {
mp_hal_pin_output(LED0);
mp_hal_pin_output(LED1);
mp_hal_pin_output(LED2);
}
void led_state(int led, int val) {
if (led == 1) {
led = LED0;
}
if (val) {
MICROPY_HW_LED_ON(led);
} else {
MICROPY_HW_LED_OFF(led);
}
}
/******************************************************************************/
// USR BUTTON
static void usrbtn_init(void) {
mp_hal_pin_config(MICROPY_HW_USRSW_PIN, MP_HAL_PIN_MODE_INPUT, MICROPY_HW_USRSW_PULL, 0);
}
static int usrbtn_state(void) {
return mp_hal_pin_read(MICROPY_HW_USRSW_PIN) == MICROPY_HW_USRSW_PRESSED;
}
/******************************************************************************/
// FLASH
typedef struct {
uint32_t base_address;
uint32_t sector_size;
uint32_t sector_count;
} flash_layout_t;
#if defined(STM32F7)
// FLASH_FLAG_PGSERR (Programming Sequence Error) was renamed to
// FLASH_FLAG_ERSERR (Erasing Sequence Error) in STM32F7
#define FLASH_FLAG_PGSERR FLASH_FLAG_ERSERR
#endif
#if defined(STM32F4) \
|| defined(STM32F722xx) \
|| defined(STM32F723xx) \
|| defined(STM32F732xx) \
|| defined(STM32F733xx)
#define FLASH_LAYOUT_STR "@Internal Flash /0x08000000/04*016Kg,01*064Kg,07*128Kg"
static const flash_layout_t flash_layout[] = {
{ 0x08000000, 0x04000, 4 },
{ 0x08010000, 0x10000, 1 },
{ 0x08020000, 0x20000, 3 },
#if defined(FLASH_SECTOR_8)
{ 0x08080000, 0x20000, 4 },
#endif
#if defined(FLASH_SECTOR_12)
{ 0x08100000, 0x04000, 4 },
{ 0x08110000, 0x10000, 1 },
{ 0x08120000, 0x20000, 7 },
#endif
};
#elif defined(STM32F767xx)
#define FLASH_LAYOUT_STR "@Internal Flash /0x08000000/04*032Kg,01*128Kg,07*256Kg"
// This is for dual-bank mode disabled
static const flash_layout_t flash_layout[] = {
{ 0x08000000, 0x08000, 4 },
{ 0x08020000, 0x20000, 1 },
{ 0x08040000, 0x40000, 7 },
};
#endif
static uint32_t flash_get_sector_index(uint32_t addr) {
if (addr >= flash_layout[0].base_address) {
uint32_t sector_index = 0;
for (int i = 0; i < MP_ARRAY_SIZE(flash_layout); ++i) {
for (int j = 0; j < flash_layout[i].sector_count; ++j) {
uint32_t sector_start_next = flash_layout[i].base_address
+ (j + 1) * flash_layout[i].sector_size;
if (addr < sector_start_next) {
return sector_index;
}
++sector_index;
}
}
}
return 0;
}
static int do_mass_erase(void) {
// TODO
return -1;
}
static int do_page_erase(uint32_t addr) {
uint32_t sector = flash_get_sector_index(addr);
if (sector == 0) {
// Don't allow to erase the sector with this bootloader in it
return -1;
}
led_state(LED0, 1);
HAL_FLASH_Unlock();
// Clear pending flags (if any)
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |
FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
// erase the sector(s)
FLASH_EraseInitTypeDef EraseInitStruct;
EraseInitStruct.TypeErase = TYPEERASE_SECTORS;
EraseInitStruct.VoltageRange = VOLTAGE_RANGE_3; // voltage range needs to be 2.7V to 3.6V
EraseInitStruct.Sector = sector;
EraseInitStruct.NbSectors = 1;
uint32_t SectorError = 0;
if (HAL_FLASHEx_Erase(&EraseInitStruct, &SectorError) != HAL_OK) {
// error occurred during sector erase
return -1;
}
led_state(LED0, 0);
// Check the erase set bits to 1, at least for the first 256 bytes
for (int i = 0; i < 64; ++i) {
if (((volatile uint32_t*)addr)[i] != 0xffffffff) {
return -2;
}
}
return 0;
}
static int do_write(uint32_t addr, const uint8_t *src8, size_t len) {
if (addr >= flash_layout[0].base_address && addr < flash_layout[0].base_address + flash_layout[0].sector_size) {
// Don't allow to write the sector with this bootloader in it
return -1;
}
static uint32_t led_tog = 0;
led_state(LED0, (led_tog++) & 16);
const uint32_t *src = (const uint32_t*)src8;
size_t num_word32 = (len + 3) / 4;
HAL_FLASH_Unlock();
// program the flash word by word
for (size_t i = 0; i < num_word32; i++) {
if (HAL_FLASH_Program(TYPEPROGRAM_WORD, addr, *src) != HAL_OK) {
return -1;
}
addr += 4;
src += 1;
}
// TODO verify data
return 0;
}
/******************************************************************************/
// I2C slave interface
#if defined(MBOOT_I2C_SCL)
#define PASTE2(a, b) a ## b
#define PASTE3(a, b, c) a ## b ## c
#define EVAL_PASTE2(a, b) PASTE2(a, b)
#define EVAL_PASTE3(a, b, c) PASTE3(a, b, c)
#define MBOOT_I2Cx EVAL_PASTE2(I2C, MBOOT_I2C_PERIPH_ID)
#define I2Cx_EV_IRQn EVAL_PASTE3(I2C, MBOOT_I2C_PERIPH_ID, _EV_IRQn)
#define I2Cx_EV_IRQHandler EVAL_PASTE3(I2C, MBOOT_I2C_PERIPH_ID, _EV_IRQHandler)
#define I2C_CMD_BUF_LEN (129)
enum {
I2C_CMD_ECHO = 1,
I2C_CMD_GETID, // () -> u8*12 unique id, ASCIIZ mcu name, ASCIIZ board name
I2C_CMD_GETCAPS, // not implemented
I2C_CMD_RESET, // () -> ()
I2C_CMD_CONFIG, // not implemented
I2C_CMD_GETLAYOUT, // () -> ASCII string
I2C_CMD_MASSERASE, // () -> ()
I2C_CMD_PAGEERASE, // le32 -> ()
I2C_CMD_SETRDADDR, // le32 -> ()
I2C_CMD_SETWRADDR, // le32 -> ()
I2C_CMD_READ, // u8 -> bytes
I2C_CMD_WRITE, // bytes -> ()
I2C_CMD_COPY, // not implemented
I2C_CMD_CALCHASH, // le32 -> u8*32
I2C_CMD_MARKVALID, // () -> ()
};
typedef struct _i2c_obj_t {
volatile bool cmd_send_arg;
volatile bool cmd_arg_sent;
volatile int cmd_arg;
volatile uint32_t cmd_rdaddr;
volatile uint32_t cmd_wraddr;
volatile uint16_t cmd_buf_pos;
uint8_t cmd_buf[I2C_CMD_BUF_LEN];
} i2c_obj_t;
static i2c_obj_t i2c_obj;
void i2c_init(int addr) {
i2c_obj.cmd_send_arg = false;
mp_hal_pin_config(MBOOT_I2C_SCL, MP_HAL_PIN_MODE_ALT_OPEN_DRAIN, MP_HAL_PIN_PULL_NONE, MBOOT_I2C_ALTFUNC);
mp_hal_pin_config(MBOOT_I2C_SDA, MP_HAL_PIN_MODE_ALT_OPEN_DRAIN, MP_HAL_PIN_PULL_NONE, MBOOT_I2C_ALTFUNC);
i2c_slave_init(MBOOT_I2Cx, I2Cx_EV_IRQn, IRQ_PRI_I2C, addr);
}
int i2c_slave_process_addr_match(int rw) {
if (i2c_obj.cmd_arg_sent) {
i2c_obj.cmd_send_arg = false;
}
i2c_obj.cmd_buf_pos = 0;
return 0; // ACK
}
int i2c_slave_process_rx_byte(uint8_t val) {
if (i2c_obj.cmd_buf_pos < sizeof(i2c_obj.cmd_buf)) {
i2c_obj.cmd_buf[i2c_obj.cmd_buf_pos++] = val;
}
return 0; // ACK
}
void i2c_slave_process_rx_end(void) {
if (i2c_obj.cmd_buf_pos == 0) {
return;
}
int len = i2c_obj.cmd_buf_pos - 1;
uint8_t *buf = i2c_obj.cmd_buf;
if (buf[0] == I2C_CMD_ECHO) {
++len;
} else if (buf[0] == I2C_CMD_GETID && len == 0) {
memcpy(buf, (uint8_t*)MP_HAL_UNIQUE_ID_ADDRESS, 12);
memcpy(buf + 12, MICROPY_HW_MCU_NAME, sizeof(MICROPY_HW_MCU_NAME));
memcpy(buf + 12 + sizeof(MICROPY_HW_MCU_NAME), MICROPY_HW_BOARD_NAME, sizeof(MICROPY_HW_BOARD_NAME) - 1);
len = 12 + sizeof(MICROPY_HW_MCU_NAME) + sizeof(MICROPY_HW_BOARD_NAME) - 1;
} else if (buf[0] == I2C_CMD_RESET && len == 0) {
do_reset();
} else if (buf[0] == I2C_CMD_GETLAYOUT && len == 0) {
len = strlen(FLASH_LAYOUT_STR);
memcpy(buf, FLASH_LAYOUT_STR, len);
} else if (buf[0] == I2C_CMD_MASSERASE && len == 0) {
len = do_mass_erase();
} else if (buf[0] == I2C_CMD_PAGEERASE && len == 4) {
len = do_page_erase(get_le32(buf + 1));
} else if (buf[0] == I2C_CMD_SETRDADDR && len == 4) {
i2c_obj.cmd_rdaddr = get_le32(buf + 1);
len = 0;
} else if (buf[0] == I2C_CMD_SETWRADDR && len == 4) {
i2c_obj.cmd_wraddr = get_le32(buf + 1);
len = 0;
} else if (buf[0] == I2C_CMD_READ && len == 1) {
len = buf[1];
if (len > I2C_CMD_BUF_LEN) {
len = I2C_CMD_BUF_LEN;
}
memcpy(buf, (void*)i2c_obj.cmd_rdaddr, len);
i2c_obj.cmd_rdaddr += len;
} else if (buf[0] == I2C_CMD_WRITE) {
if (i2c_obj.cmd_wraddr == APPLICATION_ADDR) {
// Mark the 2 lower bits to indicate invalid app firmware
buf[1] |= APP_VALIDITY_BITS;
}
int ret = do_write(i2c_obj.cmd_wraddr, buf + 1, len);
if (ret < 0) {
len = ret;
} else {
i2c_obj.cmd_wraddr += len;
len = 0;
}
} else if (buf[0] == I2C_CMD_CALCHASH && len == 4) {
uint32_t hashlen = get_le32(buf + 1);
static CRYAL_SHA256_CTX ctx;
sha256_init(&ctx);
sha256_update(&ctx, (const void*)i2c_obj.cmd_rdaddr, hashlen);
i2c_obj.cmd_rdaddr += hashlen;
sha256_final(&ctx, buf);
len = 32;
} else if (buf[0] == I2C_CMD_MARKVALID && len == 0) {
uint32_t buf;
buf = *(volatile uint32_t*)APPLICATION_ADDR;
if ((buf & APP_VALIDITY_BITS) != APP_VALIDITY_BITS) {
len = -1;
} else {
buf &= ~APP_VALIDITY_BITS;
int ret = do_write(APPLICATION_ADDR, (void*)&buf, 4);
if (ret < 0) {
len = ret;
} else {
buf = *(volatile uint32_t*)APPLICATION_ADDR;
if ((buf & APP_VALIDITY_BITS) != 0) {
len = -2;
} else {
len = 0;
}
}
}
} else {
len = -127;
}
i2c_obj.cmd_arg = len;
i2c_obj.cmd_send_arg = true;
i2c_obj.cmd_arg_sent = false;
}
uint8_t i2c_slave_process_tx_byte(void) {
if (i2c_obj.cmd_send_arg) {
i2c_obj.cmd_arg_sent = true;
return i2c_obj.cmd_arg;
} else if (i2c_obj.cmd_buf_pos < sizeof(i2c_obj.cmd_buf)) {
return i2c_obj.cmd_buf[i2c_obj.cmd_buf_pos++];
} else {
return 0;
}
}
#endif // defined(MBOOT_I2C_SCL)
/******************************************************************************/
// DFU
#define DFU_XFER_SIZE (2048)
enum {
DFU_DNLOAD = 1,
DFU_UPLOAD = 2,
DFU_GETSTATUS = 3,
DFU_CLRSTATUS = 4,
DFU_ABORT = 6,
};
enum {
DFU_STATUS_IDLE = 2,
DFU_STATUS_BUSY = 4,
DFU_STATUS_DNLOAD_IDLE = 5,
DFU_STATUS_MANIFEST = 7,
DFU_STATUS_UPLOAD_IDLE = 9,
DFU_STATUS_ERROR = 0xa,
};
enum {
DFU_CMD_NONE = 0,
DFU_CMD_EXIT = 1,
DFU_CMD_UPLOAD = 7,
DFU_CMD_DNLOAD = 8,
};
typedef struct _dfu_state_t {
int status;
int cmd;
uint16_t wBlockNum;
uint16_t wLength;
uint32_t addr;
uint8_t buf[DFU_XFER_SIZE] __attribute__((aligned(4)));
} dfu_state_t;
static dfu_state_t dfu_state;
static void dfu_init(void) {
dfu_state.status = DFU_STATUS_IDLE;
dfu_state.cmd = DFU_CMD_NONE;
dfu_state.addr = 0x08000000;
}
static int dfu_process_dnload(void) {
int ret = -1;
if (dfu_state.wBlockNum == 0) {
// download control commands
if (dfu_state.wLength >= 1 && dfu_state.buf[0] == 0x41) {
if (dfu_state.wLength == 1) {
// mass erase
ret = do_mass_erase();
} else if (dfu_state.wLength == 5) {
// erase page
ret = do_page_erase(get_le32(&dfu_state.buf[1]));
}
} else if (dfu_state.wLength >= 1 && dfu_state.buf[0] == 0x21) {
if (dfu_state.wLength == 5) {
// set address
dfu_state.addr = get_le32(&dfu_state.buf[1]);
ret = 0;
}
}
} else if (dfu_state.wBlockNum > 1) {
// write data to memory
ret = do_write(dfu_state.addr, dfu_state.buf, dfu_state.wLength);
}
if (ret == 0) {
return DFU_STATUS_DNLOAD_IDLE;
} else {
return DFU_STATUS_ERROR;
}
}
static void dfu_handle_rx(int cmd, int arg, int len, const void *buf) {
if (cmd == DFU_CLRSTATUS) {
// clear status
dfu_state.status = DFU_STATUS_IDLE;
dfu_state.cmd = DFU_CMD_NONE;
} else if (cmd == DFU_ABORT) {
// clear status
dfu_state.status = DFU_STATUS_IDLE;
dfu_state.cmd = DFU_CMD_NONE;
} else if (cmd == DFU_DNLOAD) {
if (len == 0) {
// exit DFU
dfu_state.cmd = DFU_CMD_EXIT;
} else {
// download
dfu_state.cmd = DFU_CMD_DNLOAD;
dfu_state.wBlockNum = arg;
dfu_state.wLength = len;
memcpy(dfu_state.buf, buf, len);
}
}
}
static void dfu_process(void) {
if (dfu_state.status == DFU_STATUS_MANIFEST) {
do_reset();
}
if (dfu_state.status == DFU_STATUS_BUSY) {
if (dfu_state.cmd == DFU_CMD_DNLOAD) {
dfu_state.cmd = DFU_CMD_NONE;
dfu_state.status = dfu_process_dnload();
}
}
}
static int dfu_handle_tx(int cmd, int arg, int len, uint8_t *buf, int max_len) {
if (cmd == DFU_UPLOAD) {
if (arg >= 2) {
dfu_state.cmd = DFU_CMD_UPLOAD;
memcpy(buf, (void*)((arg - 2) * max_len + dfu_state.addr), len);
return len;
}
} else if (cmd == DFU_GETSTATUS && len == 6) {
// execute command and get status
switch (dfu_state.cmd) {
case DFU_CMD_NONE:
break;
case DFU_CMD_EXIT:
dfu_state.status = DFU_STATUS_MANIFEST;
break;
case DFU_CMD_UPLOAD:
dfu_state.status = DFU_STATUS_UPLOAD_IDLE;
break;
case DFU_CMD_DNLOAD:
dfu_state.status = DFU_STATUS_BUSY;
break;
}
buf[0] = 0;
buf[1] = dfu_state.cmd; // TODO is this correct?
buf[2] = 0;
buf[3] = 0;
buf[4] = dfu_state.status;
buf[5] = 0;
return 6;
}
return -1;
}
/******************************************************************************/
// USB
#define USB_XFER_SIZE (DFU_XFER_SIZE)
enum {
USB_PHY_FS_ID = 0,
USB_PHY_HS_ID = 1,
};
typedef struct _pyb_usbdd_obj_t {
bool started;
USBD_HandleTypeDef hUSBDDevice;
uint8_t bRequest;
uint16_t wValue;
uint16_t wLength;
uint8_t rx_buf[USB_XFER_SIZE];
uint8_t tx_buf[USB_XFER_SIZE];
bool tx_pending;
// RAM to hold the current descriptors, which we configure on the fly
__ALIGN_BEGIN uint8_t usbd_device_desc[USB_LEN_DEV_DESC] __ALIGN_END;
__ALIGN_BEGIN uint8_t usbd_str_desc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;
} pyb_usbdd_obj_t;
#define USBD_LANGID_STRING (0x409)
__ALIGN_BEGIN static const uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END = {
USB_LEN_LANGID_STR_DESC,
USB_DESC_TYPE_STRING,
LOBYTE(USBD_LANGID_STRING),
HIBYTE(USBD_LANGID_STRING),
};
static const uint8_t dev_descr[0x12] = "\x12\x01\x00\x01\x00\x00\x00\x40\x83\x04\x11\xdf\x00\x22\x01\x02\x03\x01";
// This may be modified by USBD_GetDescriptor
static uint8_t cfg_descr[9 + 9 + 9] =
"\x09\x02\x1b\x00\x01\x01\x00\xc0\x32"
"\x09\x04\x00\x00\x00\xfe\x01\x02\x04"
"\x09\x21\x0b\xff\x00\x00\x08\x1a\x01" // \x00\x08 goes with USB_XFER_SIZE
;
static uint8_t *pyb_usbdd_DeviceDescriptor(USBD_HandleTypeDef *pdev, uint16_t *length) {
*length = USB_LEN_DEV_DESC;
return (uint8_t*)dev_descr;
}
static char get_hex_char(int val) {
val &= 0xf;
if (val <= 9) {
return '0' + val;
} else {
return 'A' + val - 10;
}
}
static void format_hex(char *buf, int val) {
buf[0] = get_hex_char(val >> 4);
buf[1] = get_hex_char(val);
}
static uint8_t *pyb_usbdd_StrDescriptor(USBD_HandleTypeDef *pdev, uint8_t idx, uint16_t *length) {
pyb_usbdd_obj_t *self = (pyb_usbdd_obj_t*)pdev->pClassData;
uint8_t *str_desc = self->usbd_str_desc;
switch (idx) {
case USBD_IDX_LANGID_STR:
*length = sizeof(USBD_LangIDDesc);
return (uint8_t*)USBD_LangIDDesc; // the data should only be read from this buf
case USBD_IDX_MFC_STR:
USBD_GetString((uint8_t*)"USBDevice Manuf", str_desc, length);
return str_desc;
case USBD_IDX_PRODUCT_STR:
USBD_GetString((uint8_t*)"USBDevice Product", str_desc, length);
return str_desc;
case USBD_IDX_SERIAL_STR: {
// This document: http://www.usb.org/developers/docs/devclass_docs/usbmassbulk_10.pdf
// says that the serial number has to be at least 12 digits long and that
// the last 12 digits need to be unique. It also stipulates that the valid
// character set is that of upper-case hexadecimal digits.
//
// The onboard DFU bootloader produces a 12-digit serial number based on
// the 96-bit unique ID, so for consistency we go with this algorithm.
// You can see the serial number if you do:
//
// dfu-util -l
//
// See: https://my.st.com/52d187b7 for the algorithim used.
uint8_t *id = (uint8_t*)MP_HAL_UNIQUE_ID_ADDRESS;
char serial_buf[16];
format_hex(&serial_buf[0], id[11]);
format_hex(&serial_buf[2], id[10] + id[2]);
format_hex(&serial_buf[4], id[9]);
format_hex(&serial_buf[6], id[8] + id[0]);
format_hex(&serial_buf[8], id[7]);
format_hex(&serial_buf[10], id[6]);
serial_buf[12] = '\0';
USBD_GetString((uint8_t*)serial_buf, str_desc, length);
return str_desc;
}
case USBD_IDX_CONFIG_STR:
USBD_GetString((uint8_t*)FLASH_LAYOUT_STR, str_desc, length);
return str_desc;
default:
return NULL;
}
}
static const USBD_DescriptorsTypeDef pyb_usbdd_descriptors = {
pyb_usbdd_DeviceDescriptor,
pyb_usbdd_StrDescriptor,
};
static uint8_t pyb_usbdd_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx) {
pyb_usbdd_obj_t *self = (pyb_usbdd_obj_t*)pdev->pClassData;
(void)self;
return USBD_OK;
}
static uint8_t pyb_usbdd_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx) {
pyb_usbdd_obj_t *self = (pyb_usbdd_obj_t*)pdev->pClassData;
(void)self;
return USBD_OK;
}
static uint8_t pyb_usbdd_Setup(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req) {
pyb_usbdd_obj_t *self = (pyb_usbdd_obj_t*)pdev->pClassData;
(void)self;
self->bRequest = req->bRequest;
self->wValue = req->wValue;
self->wLength = req->wLength;
if (req->bmRequest == 0x21) {
// host-to-device request
if (req->wLength == 0) {
// no data, process command straightaway
dfu_handle_rx(self->bRequest, self->wValue, 0, NULL);
} else {
// have data, prepare to receive it
USBD_CtlPrepareRx(pdev, self->rx_buf, req->wLength);
}
} else if (req->bmRequest == 0xa1) {
// device-to-host request
int len = dfu_handle_tx(self->bRequest, self->wValue, self->wLength, self->tx_buf, USB_XFER_SIZE);
if (len >= 0) {
self->tx_pending = true;
USBD_CtlSendData(&self->hUSBDDevice, self->tx_buf, len);
}
}
return USBD_OK;
}
static uint8_t pyb_usbdd_EP0_TxSent(USBD_HandleTypeDef *pdev) {
pyb_usbdd_obj_t *self = (pyb_usbdd_obj_t*)pdev->pClassData;
self->tx_pending = false;
#if !USE_USB_POLLING
// Process now that we have sent a response
dfu_process();
#endif
return USBD_OK;
}
static uint8_t pyb_usbdd_EP0_RxReady(USBD_HandleTypeDef *pdev) {
pyb_usbdd_obj_t *self = (pyb_usbdd_obj_t*)pdev->pClassData;
dfu_handle_rx(self->bRequest, self->wValue, self->wLength, self->rx_buf);
return USBD_OK;
}
static uint8_t *pyb_usbdd_GetCfgDesc(USBD_HandleTypeDef *pdev, uint16_t *length) {
*length = sizeof(cfg_descr);
return (uint8_t*)cfg_descr;
}
// this is used only in high-speed mode, which we don't support
static uint8_t *pyb_usbdd_GetDeviceQualifierDescriptor(USBD_HandleTypeDef *pdev, uint16_t *length) {
pyb_usbdd_obj_t *self = (pyb_usbdd_obj_t*)pdev->pClassData;
(void)self;
/*
*length = sizeof(USBD_CDC_MSC_HID_DeviceQualifierDesc);
return USBD_CDC_MSC_HID_DeviceQualifierDesc;
*/
*length = 0;
return NULL;
}
static const USBD_ClassTypeDef pyb_usbdd_class = {
pyb_usbdd_Init,
pyb_usbdd_DeInit,
pyb_usbdd_Setup,
pyb_usbdd_EP0_TxSent,
pyb_usbdd_EP0_RxReady,
NULL, // pyb_usbdd_DataIn,
NULL, // pyb_usbdd_DataOut,
NULL, // SOF
NULL, // IsoINIncomplete
NULL, // IsoOUTIncomplete
pyb_usbdd_GetCfgDesc,
pyb_usbdd_GetCfgDesc,
pyb_usbdd_GetCfgDesc,
pyb_usbdd_GetDeviceQualifierDescriptor,
};
static pyb_usbdd_obj_t pyb_usbdd;
static void pyb_usbdd_init(pyb_usbdd_obj_t *self, int phy_id) {
self->started = false;
USBD_HandleTypeDef *usbd = &self->hUSBDDevice;
usbd->id = phy_id;
usbd->dev_state = USBD_STATE_DEFAULT;
usbd->pDesc = (USBD_DescriptorsTypeDef*)&pyb_usbdd_descriptors;
usbd->pClass = &pyb_usbdd_class;
usbd->pClassData = self;
}
static void pyb_usbdd_start(pyb_usbdd_obj_t *self) {
if (!self->started) {
USBD_LL_Init(&self->hUSBDDevice, 0);
USBD_LL_Start(&self->hUSBDDevice);
self->started = true;
}
}
static void pyb_usbdd_stop(pyb_usbdd_obj_t *self) {
if (self->started) {
USBD_Stop(&self->hUSBDDevice);
self->started = false;
}
}
static int pyb_usbdd_shutdown(void) {
pyb_usbdd_stop(&pyb_usbdd);
return 0;
}
/******************************************************************************/
// main
#define RESET_MODE_LED_STATES 0x7421
static int get_reset_mode(void) {
usrbtn_init();
int reset_mode = 1;
if (usrbtn_state()) {
// Cycle through reset modes while USR is held
// Timeout is roughly 20s, where reset_mode=1
systick_init();
led_init();
reset_mode = 0;
for (int i = 0; i < 1024; i++) {
if (i % 32 == 0) {
if (++reset_mode > 4) {
reset_mode = 1;
}
uint8_t l = RESET_MODE_LED_STATES >> ((reset_mode - 1) * 4);
led_state(LED0, l & 1);
led_state(LED1, l & 2);
led_state(LED2, l & 4);
}
if (!usrbtn_state()) {
break;
}
mp_hal_delay_ms(19);
}
// Flash the selected reset mode
for (int i = 0; i < 6; i++) {
led_state(LED0, 0);
led_state(LED1, 0);
led_state(LED2, 0);
mp_hal_delay_ms(50);
uint8_t l = RESET_MODE_LED_STATES >> ((reset_mode - 1) * 4);
led_state(LED0, l & 1);
led_state(LED1, l & 2);
led_state(LED2, l & 4);
mp_hal_delay_ms(50);
}
mp_hal_delay_ms(300);
}
return reset_mode;
}
static void do_reset(void) {
led_state(LED0, 0);
led_state(LED1, 0);
led_state(LED2, 0);
mp_hal_delay_ms(50);
pyb_usbdd_shutdown();
#if defined(MBOOT_I2C_SCL)
i2c_slave_shutdown(MBOOT_I2Cx, I2Cx_EV_IRQn);
#endif
mp_hal_delay_ms(50);
NVIC_SystemReset();
}
uint32_t SystemCoreClock;
extern PCD_HandleTypeDef pcd_fs_handle;
extern PCD_HandleTypeDef pcd_hs_handle;
void stm32_main(int initial_r0) {
#if defined(STM32F4)
#if INSTRUCTION_CACHE_ENABLE
__HAL_FLASH_INSTRUCTION_CACHE_ENABLE();
#endif
#if DATA_CACHE_ENABLE
__HAL_FLASH_DATA_CACHE_ENABLE();
#endif
#if PREFETCH_ENABLE
__HAL_FLASH_PREFETCH_BUFFER_ENABLE();
#endif
#elif defined(STM32F7)
#if ART_ACCLERATOR_ENABLE
__HAL_FLASH_ART_ENABLE();
#endif
#endif
NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
#if USE_CACHE && defined(STM32F7)
SCB_EnableICache();
SCB_EnableDCache();
#endif
#ifdef MBOOT_BOOTPIN_PIN
mp_hal_pin_config(MBOOT_BOOTPIN_PIN, MP_HAL_PIN_MODE_INPUT, MBOOT_BOOTPIN_PULL, 0);
if (mp_hal_pin_read(MBOOT_BOOTPIN_PIN) == MBOOT_BOOTPIN_ACTIVE) {
goto enter_bootloader;
}
#endif
if ((initial_r0 & 0xffffff00) == 0x70ad0000) {
goto enter_bootloader;
}
// MCU starts up with 16MHz HSI
SystemCoreClock = 16000000;
int reset_mode = get_reset_mode();
uint32_t msp = *(volatile uint32_t*)APPLICATION_ADDR;
if (reset_mode != 4 && (msp & APP_VALIDITY_BITS) == 0) {
// not DFU mode so jump to application, passing through reset_mode
// undo our DFU settings
// TODO probably should disable all IRQ sources first
#if USE_CACHE && defined(STM32F7)
SCB_DisableICache();
SCB_DisableDCache();
#endif
__set_MSP(msp);
((void (*)(uint32_t)) *((volatile uint32_t*)(APPLICATION_ADDR + 4)))(reset_mode);
}
enter_bootloader:
// Init subsystems (get_reset_mode() may call these, calling them again is ok)
led_init();
// set the system clock to be HSE
SystemClock_Config();
#if USE_USB_POLLING
// irqs with a priority value greater or equal to "pri" will be disabled
// "pri" should be between 1 and 15 inclusive
uint32_t pri = 2;
pri <<= (8 - __NVIC_PRIO_BITS);
__ASM volatile ("msr basepri_max, %0" : : "r" (pri) : "memory");
#endif
#if 0
#if defined(MICROPY_HW_BDEV_IOCTL)
MICROPY_HW_BDEV_IOCTL(BDEV_IOCTL_INIT, 0);
#endif
#if defined(MICROPY_HW_BDEV2_IOCTL)
MICROPY_HW_BDEV2_IOCTL(BDEV_IOCTL_INIT, 0);
#endif
#endif
dfu_init();
pyb_usbdd_init(&pyb_usbdd, MICROPY_HW_USB_MAIN_DEV);
pyb_usbdd_start(&pyb_usbdd);
#if defined(MBOOT_I2C_SCL)
initial_r0 &= 0x7f;
if (initial_r0 == 0) {
initial_r0 = 0x23; // Default I2C address
}
i2c_init(initial_r0);
#endif
led_state(LED0, 0);
led_state(LED1, 0);
led_state(LED2, 0);
#if USE_USB_POLLING
uint32_t ss = systick_ms;
int ss2 = -1;
#endif
for (;;) {
#if USE_USB_POLLING
#if defined(MICROPY_HW_USB_FS)
if (pcd_fs_handle.Instance->GINTSTS & pcd_fs_handle.Instance->GINTMSK) {
HAL_PCD_IRQHandler(&pcd_fs_handle);
}
#endif
#if defined(MICROPY_HW_USB_HS)
if (pcd_hs_handle.Instance->GINTSTS & pcd_hs_handle.Instance->GINTMSK) {
HAL_PCD_IRQHandler(&pcd_hs_handle);
}
#endif
if (!pyb_usbdd.tx_pending) {
dfu_process();
}
#endif
#if USE_USB_POLLING
//__WFI(); // slows it down way too much; might work with 10x faster systick
if (systick_ms - ss > 50) {
ss += 50;
ss2 = (ss2 + 1) % 20;
switch (ss2) {
case 0: led_state(LED0, 1); break;
case 1: led_state(LED0, 0); break;
}
}
#else
led_state(LED0, 1);
mp_hal_delay_ms(50);
led_state(LED0, 0);
mp_hal_delay_ms(950);
#endif
}
}
void NMI_Handler(void) {
}
void MemManage_Handler(void) {
while (1) {
__fatal_error("MemManage");
}
}
void BusFault_Handler(void) {
while (1) {
__fatal_error("BusFault");
}
}
void UsageFault_Handler(void) {
while (1) {
__fatal_error("UsageFault");
}
}
void SVC_Handler(void) {
}
void DebugMon_Handler(void) {
}
void PendSV_Handler(void) {
}
void SysTick_Handler(void) {
systick_ms += 1;
// Read the systick control regster. This has the side effect of clearing
// the COUNTFLAG bit, which makes the logic in mp_hal_ticks_us
// work properly.
SysTick->CTRL;
}
#if defined(MBOOT_I2C_SCL)
void I2Cx_EV_IRQHandler(void) {
i2c_slave_ev_irq_handler(MBOOT_I2Cx);
}
#endif
#if !USE_USB_POLLING
#if defined(MICROPY_HW_USB_FS)
void OTG_FS_IRQHandler(void) {
HAL_PCD_IRQHandler(&pcd_fs_handle);
}
#endif
#if defined(MICROPY_HW_USB_HS)
void OTG_HS_IRQHandler(void) {
HAL_PCD_IRQHandler(&pcd_hs_handle);
}
#endif
#endif
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