add an option to turn off QSPI when sleep

Author: xiongyihui

ports/nrf/boards/makerdiary_m60_keyboard/mpconfigboard.h

@@ -40,6 +40,7 @@
 #define MICROPY_QSPI_DATA3                NRF_GPIO_PIN_MAP(1, 12)
 #define MICROPY_QSPI_SCK                  NRF_GPIO_PIN_MAP(1, 11)
 #define MICROPY_QSPI_CS                   NRF_GPIO_PIN_MAP(1, 13)
+#define MICROPY_QSPI_OFF_WHEN_SLEEP
 
 #define BOARD_HAS_CRYSTAL 1
 

ports/nrf/supervisor/port.c

@@ -295,6 +295,19 @@ void port_interrupt_after_ticks(uint32_t ticks) {
 }
 
 void port_sleep_until_interrupt(void) {
+#if defined(MICROPY_QSPI_CS) && defined(MICROPY_QSPI_OFF_WHEN_SLEEP)
+    // Turn off QSPI when USB is disconnected
+    if (NRF_QSPI->ENABLE && !(NRF_POWER->USBREGSTATUS & POWER_USBREGSTATUS_VBUSDETECT_Msk)) {
+        // Keep CS high when QSPI is diabled
+        nrf_gpio_cfg_output(MICROPY_QSPI_CS);
+        nrf_gpio_pin_write(MICROPY_QSPI_CS, 1);
+
+        *(volatile uint32_t *)0x40029010 = 1;
+        *(volatile uint32_t *)0x40029054 = 1;
+        NRF_QSPI->ENABLE = 0;
+    }
+#endif
+
     // Clear the FPU interrupt because it can prevent us from sleeping.
     if (NVIC_GetPendingIRQ(FPU_IRQn)) {
         __set_FPSCR(__get_FPSCR()  & ~(0x9f));

ports/nrf/supervisor/qspi_flash.c

@@ -38,7 +38,35 @@
 #include "supervisor/shared/external_flash/common_commands.h"
 #include "supervisor/shared/external_flash/qspi_flash.h"
 
+#if defined(MICROPY_QSPI_OFF_WHEN_SLEEP)
+#define QSPI_ENABLE qspi_enable
+
+static void qspi_enable(void)
+{
+    if (NRF_QSPI->ENABLE) {
+        return;
+    }
+
+    nrf_qspi_enable(NRF_QSPI);
+
+    nrf_qspi_event_clear(NRF_QSPI, NRF_QSPI_EVENT_READY);
+    nrf_qspi_task_trigger(NRF_QSPI, NRF_QSPI_TASK_ACTIVATE);
+
+    uint32_t remaining_attempts = 100;
+    do {
+        if (nrf_qspi_event_check(NRF_QSPI, NRF_QSPI_EVENT_READY)) {
+            break;
+        }
+        NRFX_DELAY_US(10);
+    } while (--remaining_attempts);
+}
+
+#else
+#define QSPI_ENABLE()
+#endif
+
 bool spi_flash_command(uint8_t command) {
+    QSPI_ENABLE();
     nrf_qspi_cinstr_conf_t cinstr_cfg = {
         .opcode = command,
         .length = 1,
@@ -51,6 +79,7 @@ bool spi_flash_command(uint8_t command) {
 }
 
 bool spi_flash_read_command(uint8_t command, uint8_t* response, uint32_t length) {
+    QSPI_ENABLE();
     nrf_qspi_cinstr_conf_t cinstr_cfg = {
         .opcode = command,
         .length = length + 1,
@@ -64,6 +93,7 @@ bool spi_flash_read_command(uint8_t command, uint8_t* response, uint32_t length)
 }
 
 bool spi_flash_write_command(uint8_t command, uint8_t* data, uint32_t length) {
+    QSPI_ENABLE();
     nrf_qspi_cinstr_conf_t cinstr_cfg = {
         .opcode = command,
         .length = length + 1,
@@ -76,20 +106,23 @@ bool spi_flash_write_command(uint8_t command, uint8_t* data, uint32_t length) {
 }
 
 bool spi_flash_sector_command(uint8_t command, uint32_t address) {
+    QSPI_ENABLE();
     if (command != CMD_SECTOR_ERASE) {
         return false;
     }
     return nrfx_qspi_erase(NRF_QSPI_ERASE_LEN_4KB, address) == NRFX_SUCCESS;
 }
 
 bool spi_flash_write_data(uint32_t address, uint8_t* data, uint32_t length) {
+    QSPI_ENABLE();
     // TODO: In theory, this also needs to handle unaligned data and
     // non-multiple-of-4 length.  (in practice, I don't think the fat layer
     // generates such writes)
     return nrfx_qspi_write(data, length, address) == NRFX_SUCCESS;
 }
 
 bool spi_flash_read_data(uint32_t address, uint8_t* data, uint32_t length) {
+    QSPI_ENABLE();
     int misaligned = ((intptr_t)data) & 3;
     // If the data is misaligned, we need to read 4 bytes
     // into an aligned buffer, and then copy 1, 2, or 3 bytes from the aligned