Add flash_get_unique_id to hardware_flash
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@ -7,8 +7,17 @@
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#include "hardware/flash.h"
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#include "hardware/flash.h"
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#include "pico/bootrom.h"
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#include "pico/bootrom.h"
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#include "hardware/structs/ssi.h"
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#include "hardware/structs/ioqspi.h"
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#define FLASH_BLOCK_ERASE_CMD 0xd8
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#define FLASH_BLOCK_ERASE_CMD 0xd8
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// Standard RUID instruction: 4Bh command prefix, 32 dummy bits, 64 data bits.
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#define FLASH_RUID_CMD 0x4b
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#define FLASH_RUID_DUMMY_BYTES 4
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#define FLASH_RUID_DATA_BYTES 8
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#define FLASH_RUID_TOTAL_BYTES (1 + FLASH_RUID_DUMMY_BYTES + FLASH_RUID_DATA_BYTES)
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#define __compiler_barrier() asm volatile("" ::: "memory")
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#define __compiler_barrier() asm volatile("" ::: "memory")
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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@ -99,3 +108,72 @@ void __no_inline_not_in_flash_func(flash_range_program)(uint32_t flash_offs, con
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flash_flush_cache(); // Note this is needed to remove CSn IO force as well as cache flushing
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flash_flush_cache(); // Note this is needed to remove CSn IO force as well as cache flushing
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flash_enable_xip_via_boot2();
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flash_enable_xip_via_boot2();
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}
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}
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//-----------------------------------------------------------------------------
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// Lower-level flash access functions
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// Bitbanging the chip select using IO overrides, in case RAM-resident IRQs
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// are still running, and the FIFO bottoms out. (the bootrom does the same)
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static void flash_cs_force(bool high) {
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uint32_t field_val = high ?
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IO_QSPI_GPIO_QSPI_SS_CTRL_OUTOVER_VALUE_HIGH :
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IO_QSPI_GPIO_QSPI_SS_CTRL_OUTOVER_VALUE_LOW;
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hw_write_masked(&ioqspi_hw->io[1].ctrl,
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field_val << IO_QSPI_GPIO_QSPI_SS_CTRL_OUTOVER_LSB,
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IO_QSPI_GPIO_QSPI_SS_CTRL_OUTOVER_BITS
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);
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}
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// May want to expose this at some point but this is unlikely to be the right
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// interface to do so. Keep it static
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static void __no_inline_not_in_flash_func(flash_do_cmd)(const uint8_t *txbuf, uint8_t *rxbuf, size_t count) {
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void (*connect_internal_flash)(void) = (void(*)(void))rom_func_lookup(rom_table_code('I', 'F'));
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void (*flash_exit_xip)(void) = (void(*)(void))rom_func_lookup(rom_table_code('E', 'X'));
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void (*flash_flush_cache)(void) = (void(*)(void))rom_func_lookup(rom_table_code('F', 'C'));
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assert(connect_internal_flash && flash_exit_xip && flash_flush_cache);
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flash_init_boot2_copyout();
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__compiler_barrier();
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connect_internal_flash();
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flash_exit_xip();
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flash_cs_force(0);
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size_t tx_remaining = count;
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size_t rx_remaining = count;
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// We may be interrupted -- don't want FIFO to overflow if we're distracted.
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const size_t max_in_flight = 16 - 2;
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while (tx_remaining || rx_remaining) {
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uint32_t flags = ssi_hw->sr;
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bool can_put = !!(flags & SSI_SR_TFNF_BITS);
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bool can_get = !!(flags & SSI_SR_RFNE_BITS);
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if (can_put && tx_remaining && rx_remaining - tx_remaining < max_in_flight) {
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ssi_hw->dr0 = *txbuf++;
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--tx_remaining;
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}
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if (can_get && rx_remaining) {
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*rxbuf++ = ssi_hw->dr0;
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--rx_remaining;
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}
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}
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flash_cs_force(1);
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flash_flush_cache();
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flash_enable_xip_via_boot2();
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}
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// Use standard RUID command to get a unique identifier for the flash (and
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// hence the board)
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static_assert(FLASH_UNIQUE_ID_SIZE_BYTES == FLASH_RUID_DATA_BYTES);
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void flash_get_unique_id(uint8_t *id_out) {
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#if PICO_NO_FLASH
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panic_unsupported();
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#else
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uint8_t txbuf[FLASH_RUID_TOTAL_BYTES] = {0};
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uint8_t rxbuf[FLASH_RUID_TOTAL_BYTES] = {0};
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txbuf[0] = 0x4b;
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flash_do_cmd(txbuf, rxbuf, FLASH_RUID_TOTAL_BYTES);
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for (int i = 0; i < FLASH_RUID_DATA_BYTES; i++)
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id_out[i] = rxbuf[i + 1 + FLASH_RUID_DUMMY_BYTES];
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#endif
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}
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@ -18,6 +18,8 @@
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#define FLASH_SECTOR_SIZE (1u << 12)
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#define FLASH_SECTOR_SIZE (1u << 12)
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#define FLASH_BLOCK_SIZE (1u << 16)
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#define FLASH_BLOCK_SIZE (1u << 16)
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#define FLASH_UNIQUE_ID_SIZE_BYTES 8
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/** \file flash.h
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/** \file flash.h
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* \defgroup hardware_flash hardware_flash
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* \defgroup hardware_flash hardware_flash
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*
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*
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@ -28,6 +30,10 @@
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* synchronisation to make sure no XIP accesses take place during flash
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* synchronisation to make sure no XIP accesses take place during flash
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* programming.
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* programming.
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*
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*
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* Likewise they are *unsafe* if you have interrupt handlers or an interrupt
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* vector table in flash, so you must disable interrupts before calling in
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* this case.
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*
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* If PICO_NO_FLASH=1 is not defined (i.e. if the program is built to run from
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* If PICO_NO_FLASH=1 is not defined (i.e. if the program is built to run from
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* flash) then these functions will make a static copy of the second stage
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* flash) then these functions will make a static copy of the second stage
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* bootloader in SRAM, and use this to reenter execute-in-place mode after
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* bootloader in SRAM, and use this to reenter execute-in-place mode after
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@ -54,6 +60,19 @@ void flash_range_erase(uint32_t flash_offs, size_t count);
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* \param data Pointer to the data to program into flash
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* \param data Pointer to the data to program into flash
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* \param count Number of bytes to program. Must be a multiple of 256 bytes (one page).
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* \param count Number of bytes to program. Must be a multiple of 256 bytes (one page).
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*/
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*/
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void flash_range_program(uint32_t flash_offs, const uint8_t *data, size_t count);
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void flash_range_program(uint32_t flash_offs, const uint8_t *data, size_t count);
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/*! \brief Get flash unique 64 bit identifier
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* \ingroup hardware_flash
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*
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* Use a standard 4Bh RUID instruction to retrieve the 64 bit unique
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* identifier from a flash device attached to the QSPI interface. Since there
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* is a 1:1 association between the MCU and this flash, this also serves as a
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* unique identifier for the board.
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*
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* \param id_out Pointer to an 8-byte buffer to which the ID will be written
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*/
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void flash_get_unique_id(uint8_t *id_out);
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#endif
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#endif
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