Tasmota/tasmota/support_esptool.ino

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/*
support_esptool.ino - esptool support for Tasmota
2019-12-31 13:23:34 +00:00
Copyright (C) 2020 Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define USE_ESPTOOL
#ifdef USE_ESPTOOL
/*********************************************************************************************\
* EspTool Erase function based on Version 2.8
*
* Source: https://github.com/espressif/esptool/blob/master/flasher_stub
\*********************************************************************************************/
// *** flasher_stub/include/soc_support.h
#define READ_REG(REG) (*((volatile uint32_t *)(REG)))
#define WRITE_REG(REG, VAL) *((volatile uint32_t *)(REG)) = (VAL)
#define REG_SET_MASK(reg, mask) WRITE_REG((reg), (READ_REG(reg)|(mask)))
#define SPI_BASE_REG 0x60000200 // SPI peripheral 0
#define SPI_CMD_REG (SPI_BASE_REG + 0x00)
#define SPI_FLASH_RDSR (1<<27)
#define SPI_FLASH_SE (1<<24)
#define SPI_FLASH_BE (1<<23)
#define SPI_FLASH_WREN (1<<30)
#define SPI_ADDR_REG (SPI_BASE_REG + 0x04)
#define SPI_CTRL_REG (SPI_BASE_REG + 0x08)
#define SPI_RD_STATUS_REG (SPI_BASE_REG + 0x10)
#define SPI_W0_REG (SPI_BASE_REG + 0x40)
#define SPI_EXT2_REG (SPI_BASE_REG + 0xF8)
#define SPI_ST 0x7 // Done state value
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// *** flasher_stub/include/stub_flasher.h
#define SECTORS_PER_BLOCK (FLASH_BLOCK_SIZE / SPI_FLASH_SEC_SIZE)
// *** flasher_stub/stub_write_flash.c
static const uint32_t STATUS_WIP_BIT = (1 << 0); // SPI status bits
// Wait for the SPI state machine to be ready, ie no command in progress in the internal host.
inline static void spi_wait_ready(void)
{
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while((READ_REG(SPI_EXT2_REG) & SPI_ST)) { } // Wait for SPI state machine ready
}
// Returns true if the spiflash is ready for its next write operation.
// Doesn't block, except for the SPI state machine to finish any previous SPI host operation.
static bool spiflash_is_ready(void)
{
spi_wait_ready();
WRITE_REG(SPI_RD_STATUS_REG, 0);
WRITE_REG(SPI_CMD_REG, SPI_FLASH_RDSR); // Issue read status command
while(READ_REG(SPI_CMD_REG) != 0) { }
uint32_t status_value = READ_REG(SPI_RD_STATUS_REG);
return (status_value & STATUS_WIP_BIT) == 0;
}
static void spi_write_enable(void)
{
while(!spiflash_is_ready()) { }
WRITE_REG(SPI_CMD_REG, SPI_FLASH_WREN);
while(READ_REG(SPI_CMD_REG) != 0) { }
}
bool EsptoolEraseSector(uint32_t sector)
{
spi_write_enable();
spi_wait_ready();
WRITE_REG(SPI_ADDR_REG, (sector * SPI_FLASH_SEC_SIZE) & 0xffffff);
WRITE_REG(SPI_CMD_REG, SPI_FLASH_SE); // Sector erase, 4KB
while(READ_REG(SPI_CMD_REG) != 0) { }
while(!spiflash_is_ready()) { }
return true;
}
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void EsptoolErase(uint32_t start_sector, uint32_t end_sector)
{
int next_erase_sector = start_sector;
int remaining_erase_sector = end_sector - start_sector;
while (remaining_erase_sector > 0) {
spi_write_enable();
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uint32_t command = SPI_FLASH_SE; // Sector erase, 4kB
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uint32_t sectors_to_erase = 1;
if (remaining_erase_sector >= SECTORS_PER_BLOCK &&
next_erase_sector % SECTORS_PER_BLOCK == 0) {
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command = SPI_FLASH_BE; // Block erase 64kB if we have space for it
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sectors_to_erase = SECTORS_PER_BLOCK;
}
uint32_t addr = next_erase_sector * SPI_FLASH_SEC_SIZE;
spi_wait_ready();
WRITE_REG(SPI_ADDR_REG, addr & 0xffffff);
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WRITE_REG(SPI_CMD_REG, command); // Perform erase, 4kB or 65kB
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while(READ_REG(SPI_CMD_REG) != 0) { }
remaining_erase_sector -= sectors_to_erase;
next_erase_sector += sectors_to_erase;
while (!spiflash_is_ready()) { }
yield();
OsWatchLoop();
}
}
#endif // USE_ESPTOOL