Update RP2040 PIO support

Add example user setup 61

Processors/TFT_eSPI_RP2040.c

@@ -29,7 +29,7 @@
   // Board package specific differences
   #ifdef ARDUINO_ARCH_MBED
     // Not supported at the moment
-    #error The Arduino RP2040 MBED board package is not supported. Use the community package by Earle Philhower.
+    #error The Arduino RP2040 MBED board package is not supported when PIO is used. Use the community package by Earle Philhower.
   #endif
 
   // Community RP2040 board package by Earle Philhower
@@ -213,12 +213,12 @@ void pioinit(uint16_t clock_div, uint16_t fract_div) {
   // Create the pull stall bit mask
   pull_stall_mask = 1u << (PIO_FDEBUG_TXSTALL_LSB + pio_sm);
   
-  // Create the assembler instruction for the jump to byte send routine
+  // Create the instructions for the jumps to send routines
   pio_instr_jmp8  = pio_encode_jmp(program_offset + tft_io_offset_start_8);
-  //pio_instr_jmp32 = pio_encode_jmp(program_offset + tft_io_offset_start_32);
   pio_instr_fill  = pio_encode_jmp(program_offset + tft_io_offset_block_fill);
   pio_instr_addr  = pio_encode_jmp(program_offset + tft_io_offset_set_addr_window);
-  
+
+  // Create the instructions to set and clear the DC signal
   pio_instr_set_dc = pio_encode_set((pio_src_dest)0, 1);
   pio_instr_clr_dc = pio_encode_set((pio_src_dest)0, 0);
 }

Processors/pio_8bit_parallel.pio

@@ -14,16 +14,6 @@
 // by waiting for the SM to be idle and setting its PC.
 // The default SM routine is a 16 bit transfer
 
-public start_32:
-   // Fetch the next 32 bit value from the TX FIFO and set TFT_WR high.
-   pull side 1
-   // Output byte, TFT_WR low.
-   out pins, 8 side 0 [1]
-   // Loop until 4 bytes sent, TFT_WR high.
-   jmp !osre, send_xy side 1 [1]
-   //Jump back to 16 bit
-   jmp start_16
-
 // Do a block fill of N+1 pixels.
 public block_fill:
    // Fetch colour value.

Processors/pio_8bit_parallel.pio.h

@@ -12,56 +12,51 @@
 // tft_io //
 // ------ //
 
-#define tft_io_wrap_target 13
-#define tft_io_wrap 31
+#define tft_io_wrap_target 9
+#define tft_io_wrap 27
 
-#define tft_io_offset_start_32 0u
-#define tft_io_offset_block_fill 4u
-#define tft_io_offset_start_16 13u
-#define tft_io_offset_start_8 18u
-#define tft_io_offset_set_addr_window 21u
+#define tft_io_offset_block_fill 0u
+#define tft_io_offset_start_16 9u
+#define tft_io_offset_start_8 14u
+#define tft_io_offset_set_addr_window 17u
 
 static const uint16_t tft_io_program_instructions[] = {
     0x98a0, //  0: pull   block           side 1     
-    0x7108, //  1: out    pins, 8         side 0 [1] 
-    0x19fc, //  2: jmp    !osre, 28       side 1 [1] 
-    0x000d, //  3: jmp    13                         
-    0x98a0, //  4: pull   block           side 1     
-    0xa027, //  5: mov    x, osr                     
-    0x80a0, //  6: pull   block                      
-    0xa047, //  7: mov    y, osr                     
-    0xb8e1, //  8: mov    osr, x          side 1     
-    0x7118, //  9: out    pins, 24        side 0 [1] 
-    0xb942, // 10: nop                    side 1 [1] 
-    0x7108, // 11: out    pins, 8         side 0 [1] 
-    0x1888, // 12: jmp    y--, 8          side 1     
+    0xa027, //  1: mov    x, osr                     
+    0x80a0, //  2: pull   block                      
+    0xa047, //  3: mov    y, osr                     
+    0xb8e1, //  4: mov    osr, x          side 1     
+    0x7118, //  5: out    pins, 24        side 0 [1] 
+    0xb942, //  6: nop                    side 1 [1] 
+    0x7108, //  7: out    pins, 8         side 0 [1] 
+    0x1884, //  8: jmp    y--, 4          side 1     
             //     .wrap_target
-    0x98a0, // 13: pull   block           side 1     
-    0x7118, // 14: out    pins, 24        side 0 [1] 
-    0xb942, // 15: nop                    side 1 [1] 
-    0x7108, // 16: out    pins, 8         side 0 [1] 
-    0x180d, // 17: jmp    13              side 1     
-    0x98a0, // 18: pull   block           side 1     
-    0x7100, // 19: out    pins, 32        side 0 [1] 
-    0x180d, // 20: jmp    13              side 1     
-    0xf822, // 21: set    x, 2            side 1     
-    0xe000, // 22: set    pins, 0                    
-    0x80a0, // 23: pull   block                      
-    0x7000, // 24: out    pins, 32        side 0     
-    0x003e, // 25: jmp    !x, 30                     
-    0x98a0, // 26: pull   block           side 1     
+    0x98a0, //  9: pull   block           side 1     
+    0x7118, // 10: out    pins, 24        side 0 [1] 
+    0xb942, // 11: nop                    side 1 [1] 
+    0x7108, // 12: out    pins, 8         side 0 [1] 
+    0x1809, // 13: jmp    9               side 1     
+    0x98a0, // 14: pull   block           side 1     
+    0x7100, // 15: out    pins, 32        side 0 [1] 
+    0x1809, // 16: jmp    9               side 1     
+    0xf822, // 17: set    x, 2            side 1     
+    0xe000, // 18: set    pins, 0                    
+    0x80a0, // 19: pull   block                      
+    0x7000, // 20: out    pins, 32        side 0     
+    0x003a, // 21: jmp    !x, 26                     
+    0x98a0, // 22: pull   block           side 1     
+    0xe001, // 23: set    pins, 1                    
+    0x7108, // 24: out    pins, 8         side 0 [1] 
+    0x19f8, // 25: jmp    !osre, 24       side 1 [1] 
+    0x1852, // 26: jmp    x--, 18         side 1     
     0xe001, // 27: set    pins, 1                    
-    0x7108, // 28: out    pins, 8         side 0 [1] 
-    0x19fc, // 29: jmp    !osre, 28       side 1 [1] 
-    0x1856, // 30: jmp    x--, 22         side 1     
-    0xe001, // 31: set    pins, 1                    
             //     .wrap
 };
 
 #if !PICO_NO_HARDWARE
 static const struct pio_program tft_io_program = {
     .instructions = tft_io_program_instructions,
-    .length = 32,
+    .length = 28,
     .origin = -1,
 };
 

TFT_eSPI.h

@@ -9,14 +9,14 @@
   The built-in fonts 4, 6, 7 and 8 are Run Length
   Encoded (RLE) to reduce the FLASH footprint.
 
-  Last review/edit by Bodmer: 21/04/21
+  Last review/edit by Bodmer: 05/01/22
  ****************************************************/
 
 // Stop fonts etc being loaded multiple times
 #ifndef _TFT_eSPIH_
 #define _TFT_eSPIH_
 
-#define TFT_ESPI_VERSION "2.4.21"
+#define TFT_ESPI_VERSION "2.4.22"
 
 // Bit level feature flags
 // Bit 0 set: viewport capability

User_Setups/Setup61_RP2040_ILI9341_PIO_SPI.h

+// Setup file for RP2040 and SPI ILI9341 display using PIO for the display interface
+
+// The PIO can only be user with Earle Philhower's RP2040 board package:
+// https://github.com/earlephilhower/arduino-pico
+
+// PIO SPI allows high SPI clock rates to be used when the processor is over-clocked.
+// PIO SPI is "write only" and the TFT_eSPI touch functions are not supported.
+// A touch screen could be used with a third party library on different SPI pins.
+
+// This invokes the PIO based SPI interface for the RP2040 processor.
+#define RP2040_PIO_SPI
+
+// TFT driver
+#define ILI9341_DRIVER
+
+// Pins - the PIO will control MOSI, SCLK and DC pins
+// Any digital GPIO pins may be used
+//#define TFT_MISO  -1 // MISO is not used or supported
+#define TFT_MOSI  11
+#define TFT_SCLK  10
+#define TFT_CS     9  // Chip select control pin
+#define TFT_DC     8  // Data Command control pin
+#define TFT_RST   15  // Reset pin (could connect to Arduino RESET pin)
+
+//#define TFT_BL   13           // Optional LED back-light control pin
+//#define TFT_BACKLIGHT_ON LOW  // Level to turn ON back-light (HIGH or LOW)
+
+
+#define LOAD_GLCD   // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
+#define LOAD_FONT2  // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
+#define LOAD_FONT4  // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
+#define LOAD_FONT6  // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
+#define LOAD_FONT7  // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:-.
+#define LOAD_FONT8  // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
+#define LOAD_GFXFF  // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts
+
+#define SMOOTH_FONT
+
+// #define SPI_FREQUENCY   1000000
+// #define SPI_FREQUENCY   5000000
+// #define SPI_FREQUENCY  10000000
+// #define SPI_FREQUENCY  20000000
+// #define SPI_FREQUENCY  32000000
+#define SPI_FREQUENCY  62500000

library.json

 {
   "name": "TFT_eSPI",
-  "version": "2.4.21",
+  "version": "2.4.22",
   "keywords": "Arduino, tft, ePaper, display, Pico, RP2040, STM32, ESP8266, NodeMCU, ESP32, M5Stack, ILI9341, ST7735, ILI9163, S6D02A1, ILI9481, ILI9486, ILI9488, ST7789, RM68140, SSD1351, SSD1963, ILI9225, HX8357D",
   "description": "A TFT and ePaper SPI graphics library with optimisation for Raspberry Pi Pico, ESP8266, ESP32 and STM32",
   "repository":

library.properties

 name=TFT_eSPI
-version=2.4.21
+version=2.4.22
 author=Bodmer
 maintainer=Bodmer
 sentence=TFT graphics library for Arduino processors with performance optimisation for RP2040, STM32, ESP8266 and ESP32