Add schematics and additional pictures, reconfigure for using SPI0 wh…

…ich is faster and more reliable.

CMakeLists.txt

@@ -23,11 +23,11 @@ set(TINYUSB_LIBNETWORKING_SOURCES
     ${PICO_TINYUSB_PATH}/lib/networking/rndis_reports.c
 )
 
-add_executable(${PROJECT_NAME} src/pico_gb_printer.c src/tusb_lwip_glue.c src/usb_descriptors.c ${TINYUSB_LIBNETWORKING_SOURCES})
+add_executable(${PROJECT_NAME} src/pico_gb_printer.c src/tusb_lwip_glue.c src/usb_descriptors.c src/flasher.c ${TINYUSB_LIBNETWORKING_SOURCES})
 
 pico_enable_stdio_usb(${PROJECT_NAME} 0)
 pico_enable_stdio_uart(${PROJECT_NAME} 0)
 target_include_directories(${PROJECT_NAME} PRIVATE ${LWIP_INCLUDE_DIRS} ${PICO_TINYUSB_PATH}/src ${PICO_TINYUSB_PATH}/lib/networking)
-target_link_libraries(${PROJECT_NAME} pico_stdlib pico_multicore pico_unique_id hardware_spi tinyusb_device lwipallapps lwipcore)
+target_link_libraries(${PROJECT_NAME} pico_stdlib pico_multicore pico_unique_id hardware_spi tinyusb_device lwipallapps lwipcore hardware_flash)
 pico_add_extra_outputs(${PROJECT_NAME})
 target_compile_definitions(${PROJECT_NAME} PRIVATE PICO_ENTER_USB_BOOT_ON_EXIT=1)

README.md

@@ -9,10 +9,22 @@ Based on the original webserver for the PI Pico repo: https://github.com/maxnet/
 Webserver example that came with TinyUSB slightly modified to run on a Raspberry Pi Pico.
 Lets the Pico pretend to be a USB Ethernet device. Runs the webinterface at http://192.168.7.1/
 
-I suggest to use this board: https://stacksmashing.gumroad.com/l/gb-link with PI Pico.
-
 Special thanks to Raphael-Boichot, please check this repo: https://github.com/Raphael-Boichot/The-Arduino-SD-Game-Boy-Printer
 
+## Schematics
+
+You will need a Raspberry Pi, 1/2 of the game boy link cable and a four-channel 5v to 3.3v level shifter. Connect parts as shown:
+
+<p align="center">
+  <img src="https://github.com/untoxa/pico-gb-printer/blob/main/screenshot.png?raw=true"/>
+</p>
+
+This is the example of the ready-to-use device:
+
+<p align="center">
+  <img src="https://github.com/untoxa/pico-gb-printer/blob/main/device.jpg?raw=true"/>
+</p>
+
 ## Build dependencies
 
 ### On Debian:

include/flasher.h

@@ -0,0 +1,8 @@
+#ifndef _FLASHER_H_INCLUDE_
+#define _FLASHER_H_INCLUDE_
+
+uint8_t * flash_address(uint32_t sector);
+uint8_t * flash_read(uint8_t * dest, uint32_t sector, uint32_t len);
+void flash_write(uint32_t sector, uint8_t * sour, uint32_t len);
+
+#endif

src/flasher.c

@@ -0,0 +1,31 @@
+#include "pico/stdlib.h"
+#include "hardware/flash.h"
+#include <string.h>
+
+extern uint8_t __flash_binary_end;
+
+static inline size_t get_sector_offset(uint32_t sector) {
+    return (((size_t)(&__flash_binary_end - (uint8_t *)XIP_BASE) / FLASH_SECTOR_SIZE) + sector + 1) * FLASH_SECTOR_SIZE;
+}
+
+uint8_t * flash_address(uint32_t sector) {
+    return (uint8_t *)XIP_BASE + get_sector_offset(sector);
+}
+
+uint8_t * flash_read(uint8_t * dest, uint32_t sector, uint32_t len) {
+    return memcpy(dest, (uint8_t *)XIP_BASE + get_sector_offset(sector), len);
+}
+
+void flash_write(uint32_t sector, uint8_t * sour, uint32_t len) {
+    uint8_t buffer[FLASH_PAGE_SIZE];
+    size_t offset = get_sector_offset(sector);
+    flash_range_erase(offset, (len / FLASH_SECTOR_SIZE + 1) * FLASH_SECTOR_SIZE);
+    while (len) {
+        uint32_t sz = (len < FLASH_PAGE_SIZE) ? len : FLASH_PAGE_SIZE;
+        memcpy(buffer, sour, sz);
+        sour += sz;
+        flash_range_program(offset, buffer, sz);
+        offset += FLASH_PAGE_SIZE;
+        len -= sz;
+    }
+}

src/pico_gb_printer.c

@@ -1,6 +1,6 @@
 #define USE_MULTICORE 1
 #define USE_KEY 1
-#define USE_SPI 0
+#define USE_SPI 1
 
 #include "pico/stdlib.h"
 #include "pico/bootrom.h"
@@ -11,8 +11,8 @@
 #include "hardware/spi.h"
 
 #include "lwip/apps/fs.h"
-
 #include "tusb_lwip_glue.h"
+#include "flasher.h"
 
 #define ENABLE_DEBUG            false
 #define BUFFER_SIZE_KB          176
@@ -33,12 +33,12 @@
 #define PIN_SOUT                2
 
 // SPI mode
-#define SPI_PORT                spi1
+#define SPI_PORT                spi0
 #define SPI_BAUDRATE            64 * 1024 * 8
 
-#define PIN_SPI_SCK             10
-#define PIN_SPI_SOUT            11
-#define PIN_SPI_SIN             12
+#define PIN_SPI_SCK             2
+#define PIN_SPI_SOUT            3
+#define PIN_SPI_SIN             0
 
 // "Tear" button
 #define PIN_KEY                 23
@@ -337,10 +337,15 @@ static inline void setup_sio() {
 }
 
 #if (USE_SPI==1)
-static inline void retrigger_spi(spi_inst_t *spi) {
+static inline void spi_off(spi_inst_t *spi) {
     hw_clear_bits(&spi_get_hw(spi)->cr1, SPI_SSPCR1_SSE_BITS);
+}
+static inline void spi_on(spi_inst_t *spi) {
     hw_set_bits(&spi_get_hw(spi)->cr1, SPI_SSPCR1_SSE_BITS);
 }
+static inline void retrigger_spi(spi_inst_t *spi) {
+    spi_off(spi), spi_on(spi);
+}
 #endif
 
 #if (USE_MULTICORE==1)