XIAO nRF52840 Sense上 的 QSPI 闪存使用
note
特别感谢社区用户 JM_Laird 和 Haakonish 对本教程的支持和帮助！本文中使用的程序来自 Github 用户 PMCheetham ，源代码可以在 这里 找到
欢迎阅读本教程，了解如何在 XIAO nRF52840 和 XIAO nRF52840 Sense 上使用 QSPI Flash！XIAO 是一款功能强大且紧凑的主板，具有 256 KB RAM、1 MB 闪存和 2 MB 板载闪存。在本教程中，您将学习如何在 XIAO 板上使用 QSPI 闪存，这可以大大扩展存储容量并加快您的项目。让我们开始吧！
以下是 PMCheetham 提供的示例程序，该程序适用于 XIAO nRF52840 Sense。通过以下程序，您可以在 XIAO 上自由使用 QSPI Flash。
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "nrfx_qspi.h"
#include "app_util_platform.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#include "sdk_config.h"
#include "nrf_delay.h"
#include "avr/interrupt.h"
/*
* Strange parts of this code ... Or things I don't understand
*
* After the first READ in Setup() it successfully reads the data (Returns 0 = NRFX_SUCCESS), but the status flag
* has the top 8 bits set to 0xFF which causes nrfx_qspi_mem_busy_check() to show 17 (Returns 17 = NRFX_ERROR_BUSY).
* However masking the STATUS register with 8 reveals the Ready Status = 1, QSPI is ready!
* This was why I wrote the QSPI_IsReady().
*
* nrf_qspi_phy_conf_t not visible as a structure if you try and set it like this :
* QSPIConfig.phy_if {
* .xxx = yyy,
* .aaa = bbb
* };
*
* I don't know what the significance of the 48ms Deep Power-down Mode (DPM) is.
* Will it go into DPM if not used for 48ms and then take 48ms to wake up if instructed?
*
* Hope you enjoy this little snippet of code! Feel free to butcher and use it.
* Thanks to JM_Laird and Haakonish in Case ID: 224515.
* And, yes, I could have made it neater, but really need to add some of the bits into a project and tidy them up there!
*/
// QSPI Settings
#define QSPI_STD_CMD_WRSR 0x01
#define QSPI_STD_CMD_RSTEN 0x66
#define QSPI_STD_CMD_RST 0x99
#define QSPI_DPM_ENTER 0x0003 // 3 x 256 x 62.5ns = 48ms
#define QSPI_DPM_EXIT 0x0003
static uint32_t *QSPI_Status_Ptr = (uint32_t*) 0x40029604; // Setup for the SEEED XIAO BLE - nRF52840
static nrfx_qspi_config_t QSPIConfig;
static nrf_qspi_cinstr_conf_t QSPICinstr_cfg;
static const uint32_t MemToUse = 64 * 1024; // Alter this to create larger read writes, 64Kb is the size of the Erase
static bool Debug_On = true;
static uint16_t pBuf[MemToUse / 2] = {0}; // 16bit used as that is what this memory is going to be used for
static uint32_t *BufMem = (uint32_t*) &pBuf;
static bool QSPIWait = false;
// QSPI Settings Complete
static void qspi_handler(nrfx_qspi_evt_t event, void *p_context) {
// UNUSED_PARAMETER(p_context);
// Serial.println("QSPI Interrupt");
// if (event == NRFX_QSPI_EVENT_DONE) {
// QSPI_HasFinished = true;
// }
}
static void QSPI_Status(char ASender[]) { // Prints the QSPI Status
Serial.print("(");
Serial.print(ASender);
Serial.print(") QSPI is busy/idle ... Result = ");
Serial.println(nrfx_qspi_mem_busy_check() & 8);
Serial.print("(");
Serial.print(ASender);
Serial.print(") QSPI Status flag = 0x");
Serial.print(NRF_QSPI->STATUS, HEX);
Serial.print(" (from NRF_QSPI) or 0x");
Serial.print(*QSPI_Status_Ptr, HEX);
Serial.println(" (from *QSPI_Status_Ptr)");
}
static void QSPI_PrintData(uint16_t *AnAddress, uint32_t AnAmount) {
uint32_t i;
Serial.print("Data :");
for (i = 0; i < AnAmount; i++) {
Serial.print(" 0x");
Serial.print(*(AnAddress + i), HEX);
}
Serial.println("");
}
static nrfx_err_t QSPI_IsReady() {
if (((*QSPI_Status_Ptr & 8) == 8) && (*QSPI_Status_Ptr & 0x01000000) == 0) {
return NRFX_SUCCESS;
} else {
return NRFX_ERROR_BUSY;
}
}
static nrfx_err_t QSPI_WaitForReady() {
while (QSPI_IsReady() == NRFX_ERROR_BUSY) {
if (Debug_On) {
Serial.print("*QSPI_Status_Ptr & 8 = ");
Serial.print(*QSPI_Status_Ptr & 8);
Serial.print(", *QSPI_Status_Ptr & 0x01000000 = 0x");
Serial.println(*QSPI_Status_Ptr & 0x01000000, HEX);
QSPI_Status("QSPI_WaitForReady");
}
}
return NRFX_SUCCESS;
}
static nrfx_err_t QSPI_Initialise() { // Initialises the QSPI and NRF LOG
uint32_t Error_Code;
NRF_LOG_INIT(NULL); // Initialise the NRF Log
NRF_LOG_DEFAULT_BACKENDS_INIT();
// QSPI Config
QSPIConfig.xip_offset = NRFX_QSPI_CONFIG_XIP_OFFSET;
QSPIConfig.pins = { // Setup for the SEEED XIAO BLE - nRF52840
.sck_pin = 21,
.csn_pin = 25,
.io0_pin = 20,
.io1_pin = 24,
.io2_pin = 22,
.io3_pin = 23,
};
QSPIConfig.irq_priority = (uint8_t)NRFX_QSPI_CONFIG_IRQ_PRIORITY;
QSPIConfig.prot_if = {
// .readoc = (nrf_qspi_readoc_t)NRFX_QSPI_CONFIG_READOC,
.readoc = (nrf_qspi_readoc_t)NRF_QSPI_READOC_READ4O,
// .writeoc = (nrf_qspi_writeoc_t)NRFX_QSPI_CONFIG_WRITEOC,
.writeoc = (nrf_qspi_writeoc_t)NRF_QSPI_WRITEOC_PP4O,
.addrmode = (nrf_qspi_addrmode_t)NRFX_QSPI_CONFIG_ADDRMODE,
.dpmconfig = false,
};
QSPIConfig.phy_if.sck_freq = (nrf_qspi_frequency_t)NRF_QSPI_FREQ_32MDIV1; // I had to do it this way as it complained about nrf_qspi_phy_conf_t not being visible
// QSPIConfig.phy_if.sck_freq = (nrf_qspi_frequency_t)NRFX_QSPI_CONFIG_FREQUENCY;
QSPIConfig.phy_if.spi_mode = (nrf_qspi_spi_mode_t)NRFX_QSPI_CONFIG_MODE;
QSPIConfig.phy_if.dpmen = false;
// QSPI Config Complete
// Setup QSPI to allow for DPM but with it turned off
QSPIConfig.prot_if.dpmconfig = true;
NRF_QSPI->DPMDUR = (QSPI_DPM_ENTER << 16) | QSPI_DPM_EXIT; // Found this on the Nordic Q&A pages, Sets the Deep power-down mode timer
Error_Code = 1;
while (Error_Code != 0) {
Error_Code = nrfx_qspi_init(&QSPIConfig, NULL, NULL);
if (Error_Code != NRFX_SUCCESS) {
if (Debug_On) {
Serial.print("(QSPI_Initialise) nrfx_qspi_init returned : ");
Serial.println(Error_Code);
}
} else {
if (Debug_On) {
Serial.println("(QSPI_Initialise) nrfx_qspi_init successful");
}
}
}
QSPI_Status("QSPI_Initialise (Before QSIP_Configure_Memory)");
QSIP_Configure_Memory();
if (Debug_On) {
Serial.println("(QSPI_Initialise) Wait for QSPI to be ready ...");
}
NRF_QSPI->TASKS_ACTIVATE = 1;
QSPI_WaitForReady();
if (Debug_On) {
Serial.println("(QSPI_Initialise) QSPI is ready");
}
return QSPI_IsReady();
}
static void QSPI_Erase(uint32_t AStartAddress) {
uint32_t TimeTaken;
bool QSPIReady = false;
bool AlreadyPrinted = false;
if (Debug_On) {
Serial.println("(QSPI_Erase) Erasing memory");
}
while (!QSPIReady) {
if (QSPI_IsReady() != NRFX_SUCCESS) {
if (!AlreadyPrinted) {
QSPI_Status("QSPI_Erase (Waiting)");
AlreadyPrinted = true;
}
} else {
QSPIReady = true;
QSPI_Status("QSPI_Erase (Waiting Loop Breakout)");
}
}
if (Debug_On) {
QSPI_Status("QSPI_Erase (Finished Waiting)");
TimeTaken = millis();
}
if (nrfx_qspi_erase(NRF_QSPI_ERASE_LEN_64KB, AStartAddress) != NRFX_SUCCESS) {
if (Debug_On) {
Serial.print("(QSPI_Initialise_Page) QSPI Address 0x");
Serial.print(AStartAddress, HEX);
Serial.println(" failed to erase!");
}
} else {
if (Debug_On) {
TimeTaken = millis() - TimeTaken;
Serial.print("(QSPI_Initialise_Page) QSPI took ");
Serial.print(TimeTaken);
Serial.println("ms to erase a 64Kb page");
}
}
}
static void QSIP_Configure_Memory() {
// uint8_t temporary = 0x40;
uint8_t temporary[] = {0x00, 0x02};
uint32_t Error_Code;
QSPICinstr_cfg = {
.opcode = QSPI_STD_CMD_RSTEN,
.length = NRF_QSPI_CINSTR_LEN_1B,
.io2_level = true,
.io3_level = true,
.wipwait = QSPIWait,
.wren = true
};
QSPI_WaitForReady();
if (nrfx_qspi_cinstr_xfer(&QSPICinstr_cfg, NULL, NULL) != NRFX_SUCCESS) { // Send reset enable
if (Debug_On) {
Serial.println("(QSIP_Configure_Memory) QSPI 'Send reset enable' failed!");
}
} else {
QSPICinstr_cfg.opcode = QSPI_STD_CMD_RST;
QSPI_WaitForReady();
if (nrfx_qspi_cinstr_xfer(&QSPICinstr_cfg, NULL, NULL) != NRFX_SUCCESS) { // Send reset command
if (Debug_On) {
Serial.println("(QSIP_Configure_Memory) QSPI Reset failed!");
}
} else {
QSPICinstr_cfg.opcode = QSPI_STD_CMD_WRSR;
QSPICinstr_cfg.length = NRF_QSPI_CINSTR_LEN_3B;
QSPI_WaitForReady();
if (nrfx_qspi_cinstr_xfer(&QSPICinstr_cfg, &temporary, NULL) != NRFX_SUCCESS) { // Switch to qspi mode
if (Debug_On) {
Serial.println("(QSIP_Configure_Memory) QSPI failed to switch to QSPI mode!");
}
} else {
QSPI_Status("QSIP_Configure_Memory");
}
}
}
}
void setup() {
uint32_t Error_Code;
uint32_t TimeTaken;
uint16_t i;
delay(10000);
Serial.begin(9600);
while (!Serial) {}
if (Debug_On) {
Serial.println("(Setup) QSPI Initialising ...");
}
if (QSPI_Initialise() != NRFX_SUCCESS) {
if (Debug_On) {
Serial.println("(Setup) QSPI Memory failed to start!");
}
} else {
if (Debug_On) {
Serial.println("(Setup) QSPI initialised and ready");
QSPI_Status("Setup (After initialise)");
}
}
if (Debug_On) {
Serial.print("(Setup) QSPI is about to be read and then erased. Current busy state is = ");
Serial.println(QSPI_IsReady());
}
// QSPI Speed Test
if (Debug_On) {
QSPI_Status("Setup (Before read)");
TimeTaken = millis();
}
Error_Code = nrfx_qspi_read(pBuf, MemToUse, 0x0);
if (Debug_On) {
TimeTaken = millis() - TimeTaken;
Serial.print("(Setup) QSPI took ");
Serial.print(TimeTaken);
Serial.print("ms to read ");
Serial.print(MemToUse / 1024);
Serial.print("Kb ... Read result = ");
Serial.println(Error_Code);
QSPI_Status("Setup (After read)");
QSPI_WaitForReady();
QSPI_PrintData(&pBuf[0], 10);
}
if (Debug_On) {
Serial.println("QSPI Erasing 64Kb of memory");
}
QSPI_Erase(0);
if (Debug_On) {
Serial.println("(Setup) QSPI read after erase");
TimeTaken = millis();
}
QSPI_WaitForReady();
Error_Code = nrfx_qspi_read(pBuf, MemToUse, 0x0);
if (Debug_On) {
TimeTaken = millis() - TimeTaken;
Serial.print("(Setup) QSPI took ");
Serial.print(TimeTaken);
Serial.print("ms to read ");
Serial.print(MemToUse / 1024);
Serial.print("Kb ... Read result = ");
Serial.println(Error_Code);
QSPI_WaitForReady();
QSPI_PrintData(&pBuf[0], 10);
}
for (i = 0; i < MemToUse / 2; i++) {
pBuf[i] = i * 2;
}
QSPI_WaitForReady();
if (Debug_On) {
Serial.println("(Setup) Just before QSPI write");
TimeTaken = millis();
}
Error_Code = nrfx_qspi_write(pBuf, MemToUse, 0x0);
if (Debug_On) {
TimeTaken = millis() - TimeTaken;
Serial.print("(Setup) QSPI took ");
Serial.print(TimeTaken);
Serial.print("ms to write ");
Serial.print(MemToUse / 1024);
Serial.print("Kb ... Write result = ");
Serial.println(Error_Code);
}
QSPI_WaitForReady();
if (Debug_On) {
Serial.println("(Setup) Just before QSPI read");
TimeTaken = millis();
}
Error_Code = nrfx_qspi_read(pBuf, MemToUse, 0x0);
if (Debug_On) {
TimeTaken = millis() - TimeTaken;
Serial.print("(Setup) QSPI took ");
Serial.print(TimeTaken);
Serial.print("ms to read ");
Serial.print(MemToUse / 1024);
Serial.print("Kb ... Read result = ");
Serial.println(Error_Code);
QSPI_WaitForReady();
QSPI_PrintData(&pBuf[0], 10);
}
QSPI_WaitForReady();
QSPI_Status("Setup");
// QSPI Speed Test Complete
}
void loop() {
delay(10000);
}
该程序仅适用于 mbed 板, 因此请在编译和上传时在 mbed 选项卡下选择 XIAO nRF52840。
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