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/**
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
// Example of reading/writing an external serial flash using the PL022 SPI interface
#include "spi_flash.h"
static inline void cs_select(uint cs_pin) {
asm volatile("nop \n nop \n nop"); // FIXME
gpio_put(cs_pin, 0);
asm volatile("nop \n nop \n nop"); // FIXME
}
static inline void cs_deselect(uint cs_pin) {
asm volatile("nop \n nop \n nop"); // FIXME
gpio_put(cs_pin, 1);
asm volatile("nop \n nop \n nop"); // FIXME
}
void __not_in_flash_func(flash_read)(spi_inst_t *spi, uint cs_pin, uint32_t addr, uint8_t* dest, size_t len) {
cs_select(cs_pin);
uint8_t cmdbuf[4] = {
FLASH_CMD_READ,
addr >> 16,
addr >> 8,
addr
};
spi_write_blocking(spi, cmdbuf, 4);
spi_read_blocking(spi, 0, dest, len);
cs_deselect(cs_pin);
}
void __not_in_flash_func(flash_write_enable)(spi_inst_t *spi, uint cs_pin) {
cs_select(cs_pin);
uint8_t cmd = FLASH_CMD_WRITE_EN;
spi_write_blocking(spi, &cmd, 1);
cs_deselect(cs_pin);
}
void __not_in_flash_func(flash_wait_done)(spi_inst_t *spi, uint cs_pin) {
uint8_t status;
do {
cs_select(cs_pin);
uint8_t buf[2] = {FLASH_CMD_STATUS, 0};
spi_write_read_blocking(spi, buf, buf, 2);
cs_deselect(cs_pin);
status = buf[1];
} while (status & FLASH_STATUS_BUSY_MASK);
}
void __not_in_flash_func(flash_sector_erase)(spi_inst_t *spi, uint cs_pin, uint32_t addr) {
uint8_t cmdbuf[4] = {
FLASH_CMD_SECTOR_ERASE,
addr >> 16,
addr >> 8,
addr
};
flash_write_enable(spi, cs_pin);
cs_select(cs_pin);
spi_write_blocking(spi, cmdbuf, 4);
cs_deselect(cs_pin);
flash_wait_done(spi, cs_pin);
}
void __not_in_flash_func(flash_block_erase)(spi_inst_t *spi, uint cs_pin, uint32_t addr) {
uint8_t cmdbuf[4] = {
FLASH_CMD_BLOCK_ERASE,
addr >> 16,
addr >> 8,
addr
};
flash_write_enable(spi, cs_pin);
cs_select(cs_pin);
spi_write_blocking(spi, cmdbuf, 4);
cs_deselect(cs_pin);
flash_wait_done(spi, cs_pin);
}
void __not_in_flash_func(flash_erase)(spi_inst_t *spi, uint cs_pin) {
uint8_t cmdbuf[1] = {
FLASH_CMD_CHIP_ERASE
};
flash_write_enable(spi, cs_pin);
cs_select(cs_pin);
spi_write_blocking(spi, cmdbuf, 1);
cs_deselect(cs_pin);
flash_wait_done(spi, cs_pin);
}
void __not_in_flash_func(flash_page_program)(spi_inst_t *spi, uint cs_pin, uint32_t addr, uint8_t* src) {
uint8_t cmdbuf[4] = {
FLASH_CMD_PAGE_PROGRAM,
addr >> 16,
addr >> 8,
addr
};
flash_write_enable(spi, cs_pin);
cs_select(cs_pin);
spi_write_blocking(spi, cmdbuf, 4);
spi_write_blocking(spi, src, FLASH_PAGE_SIZE);
cs_deselect(cs_pin);
flash_wait_done(spi, cs_pin);
}
void __not_in_flash_func(flash_write)(spi_inst_t *spi, uint cs_pin, uint32_t addr, uint8_t* src, size_t size) {
uint8_t cmdbuf[4] = {
FLASH_CMD_PAGE_PROGRAM,
addr >> 16,
addr >> 8,
addr
};
flash_write_enable(spi, cs_pin);
cs_select(cs_pin);
spi_write_blocking(spi, cmdbuf, 4);
spi_write_blocking(spi, src, size);
cs_deselect(cs_pin);
flash_wait_done(spi, cs_pin);
}
void write_entry(uint8_t* data_entry) {
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, base_addr, page_buffer, FLASH_PAGE_SIZE);
for (uint16_t i = 0; i < FLASH_PAGE_SIZE; i += PACKET_SIZE) {
if (page_buffer[i] == 0xFF) {
base_addr += i;
break;
}
if ((i + PACKET_SIZE) == FLASH_PAGE_SIZE) {
base_addr += FLASH_PAGE_SIZE;
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, base_addr, page_buffer, FLASH_PAGE_SIZE);
i = 0;
}
}
flash_write(spi_default, PICO_DEFAULT_SPI_CSN_PIN, base_addr, data_entry, PACKET_SIZE);
base_addr += PACKET_SIZE;
}
#ifdef FLASH_TEST
#include "pico/multicore.h"
#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
void printbuf(uint8_t buf[FLASH_PAGE_SIZE]) {
for (int i = 0; i < FLASH_PAGE_SIZE; ++i) {
if (i % 16 == 15)
printf("%02x\n", buf[i]);
else
printf("%02x ", buf[i]);
}
}
void core1_entry() {
printf("SPI flash example\n");
// Enable SPI 0 at 1 MHz and connect to GPIOs
spi_init(spi_default, 1000 * 1000 * 60);
gpio_set_function(PICO_DEFAULT_SPI_RX_PIN, GPIO_FUNC_SPI);
gpio_set_function(PICO_DEFAULT_SPI_TX_PIN, GPIO_FUNC_SPI);
gpio_set_function(PICO_DEFAULT_SPI_SCK_PIN, GPIO_FUNC_SPI);
// Chip select is active-low, so we'll initialise it to a driven-high state
gpio_init(PICO_DEFAULT_SPI_CSN_PIN);
gpio_set_dir(PICO_DEFAULT_SPI_CSN_PIN, GPIO_OUT);
gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 1);
// flash_erase(spi_default, PICO_DEFAULT_SPI_CSN_PIN);
// flash_sector_erase(spi_default, PICO_DEFAULT_SPI_CSN_PIN, 0);
printf("Before program:\n");
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, 0, page_buffer, FLASH_PAGE_SIZE);
printbuf(page_buffer);
uint8_t entry[PACKET_SIZE];
printf("Written Data:\n");
printf("time (us)\t|\tstate\t|\tdep pcnt\t|\talt (m)\t|\tvel (m/s)\t|\tempty\n");
for (uint16_t i = 0; i < 500; i++) {
absolute_time_t now = get_absolute_time();
uint64_t now_us= to_us_since_boot(now);
float altitude = 10.0f * i;
float velocity = 5.0f * i;
uint8_t deploy_percent = (i*1000) / 200;
printf("%"PRIu64"\t|\t%"PRIu8"\t|\t%"PRIu8"\t|\t%4.2f\t|\t%4.2f\t|\tDAWSYN_SCHRAIB\n", now_us, (uint8_t)(i), deploy_percent, altitude, velocity);
uint32_t alt_bits = *((uint32_t *)&altitude);
uint32_t vel_bits = *((uint32_t *)&velocity);
entry[0] = now_us >> 56;
entry[1] = now_us >> 48;
entry[2] = now_us >> 40;
entry[3] = now_us >> 32;
entry[4] = now_us >> 24;
entry[5] = now_us >> 16;
entry[6] = now_us >> 8;
entry[7] = now_us;
entry[8] = i;
entry[9] = deploy_percent;
entry[10] = alt_bits >> 24;
entry[11] = alt_bits >> 16;
entry[12] = alt_bits >> 8;
entry[13] = alt_bits;
entry[14] = vel_bits >> 24;
entry[15] = vel_bits >> 16;
entry[16] = vel_bits >> 8;
entry[17] = vel_bits;
entry[18] = 'D';
entry[19] = 'A';
entry[20] = 'W';
entry[21] = 'S';
entry[22] = 'Y';
entry[23] = 'N';
entry[24] = '_';
entry[25] = 'S';
entry[26] = 'C';
entry[27] = 'H';
entry[28] = 'R';
entry[29] = 'A';
entry[30] = 'I';
entry[31] = 'B';
write_entry(entry);
}
printf("After program:\n");
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, 0, page_buffer, FLASH_PAGE_SIZE);
printbuf(page_buffer);
printf("\nRead Data:\n");
printf("time (us)\t|\tstate\t|\tdep pcnt\t|\talt (m)\t|\tvel (m/s)\t|\tempty\n");
for (uint32_t i = 0; i < base_addr; i += PACKET_SIZE) {
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, i, entry, PACKET_SIZE);
uint64_t now_us = (((uint64_t)entry[0] << 56) | ((uint64_t)entry[1] << 48) | \
((uint64_t)entry[2] << 40) | ((uint64_t)entry[3] << 32) | \
((uint64_t)entry[4] << 24) | ((uint64_t)entry[5] << 16) | \
((uint64_t)entry[6] << 8) | ((uint64_t)entry[7]));
uint8_t state = entry[8];
uint8_t deploy_percent = entry[9];
uint32_t alt_bits = (entry[10] << 24) | (entry[11] << 16) | (entry[12] << 8) | (entry[13]);
uint32_t vel_bits = (entry[14] << 24) | (entry[15] << 16) | (entry[16] << 8) | (entry[17]);
float altitude = *(float *)(&alt_bits);
float velocity = *(float *)(&vel_bits);
printf("%"PRIu64"\t|\t%"PRIu8"\t|\t%"PRIu8"\t|\t%4.2f\t|\t%4.2f\t|\t%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", \
now_us, state, deploy_percent, altitude, velocity, \
entry[18],entry[19],entry[20],entry[21],entry[22],entry[23],entry[24],entry[25],entry[26],entry[27],entry[28],entry[29],entry[30],entry[31]);
}
}
int main() {
// Enable UART so we can print status output
stdio_init_all();
getchar();
multicore_launch_core1(core1_entry);
while (1) {
tight_loop_contents();
}
}
#endif
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