Changed the order of SPI configuration and activation.

SPI should be configured while chip select pin is disabled.
Tested with external flash on STM32 F4VE board.

Author: EmergReanimator

supervisor/shared/external_flash/spi_flash.c

@@ -105,12 +105,12 @@ bool spi_flash_sector_command(uint8_t command, uint32_t address) {
 
 bool spi_flash_write_data(uint32_t address, uint8_t *data, uint32_t data_length) {
     uint8_t request[4] = {CMD_PAGE_PROGRAM, 0x00, 0x00, 0x00};
+    common_hal_busio_spi_configure(&supervisor_flash_spi_bus, spi_flash_baudrate, 0, 0, 8);
     // Write the SPI flash write address into the bytes following the command byte.
     address_to_bytes(address, request + 1);
     if (!flash_enable()) {
         return false;
     }
-    common_hal_busio_spi_configure(&supervisor_flash_spi_bus, spi_flash_baudrate, 0, 0, 8);
     bool status = common_hal_busio_spi_write(&supervisor_flash_spi_bus, request, 4);
     if (status) {
         status = common_hal_busio_spi_write(&supervisor_flash_spi_bus, data, data_length);
@@ -126,12 +126,12 @@ bool spi_flash_read_data(uint32_t address, uint8_t *data, uint32_t data_length)
         request[0] = CMD_FAST_READ_DATA;
         command_length = 5;
     }
+    common_hal_busio_spi_configure(&supervisor_flash_spi_bus, spi_flash_baudrate, 0, 0, 8);
     // Write the SPI flash read address into the bytes following the command byte.
     address_to_bytes(address, request + 1);
     if (!flash_enable()) {
         return false;
     }
-    common_hal_busio_spi_configure(&supervisor_flash_spi_bus, spi_flash_baudrate, 0, 0, 8);
     bool status = common_hal_busio_spi_write(&supervisor_flash_spi_bus, request, command_length);
     if (status) {
         status = common_hal_busio_spi_read(&supervisor_flash_spi_bus, data, data_length, 0xff);