moved pinouts a bit & added reserved pins for SDA and SCL, added CTS/RTS stuff but not completely implemented yet

README.md

@@ -56,26 +56,29 @@ Raspberry Pi Pico.
 
 The pin mapping for the RP2040 is as follows:
 
-| Pin number | Usage          |
-|:---------- |:-------------- |
-| GP0        | stdio UART TX  |
-| GP1        | stdio UART RX  |
-| GND        | <ground> |
-| GP2        | SWCLK/TCK      |
-| GP3        | SWDIO/TMS      |
-| GP4        | UART TX        |
-| GP5        | UART RX        |
-| GND        | <ground> |
-| GP6        | TDI            |
-| GP7        | TDO            |
-| GP8        | nTRST          |
-| GP9        | nRESET         |
-| GND        | <ground> |
-| GP10       | SCLK           |
-| GP11       | MOSI           |
-| GP12       | MISO           |
-| GP13       | nCS            |
-| GND        | <ground> |
+| Pin number | Usage          | Usage          | Pin number |
+|:---------- |:-------------- | --------------:| ----------:|
+| GP0        | stdio UART TX  |                | VBUS       |
+| GP1        | stdio UART RX  |                | VSYS       |
+| GND        | <ground> | <ground> | GND        |
+| GP2        | SWCLK/TCK      |                | 3V3 EN     |
+| GP3        | SWDIO/TMS      |                | 3V3 OUT    |
+| GP4        | UART TX        |                | ADC VREF   |
+| GP5        | UART RX        |                | GP28 / ADC2|
+| GND        | <ground> | <ground> | GND  / AGND|
+| GP6        | TDI            |                | GP27 / ADC1|
+| GP7        | TDO            |                | GP26 / ADC0|
+| GP8        | nTRST          |                | RUN        |
+| GP9        | nRESET         |                | GP22       |
+| GND        | <ground> | <ground> | GND        |
+| GP10       | UART CTS       | SCL            | GP21       |
+| GP11       | UART RTS       | SDA            | GP20       |
+| GP12       | MISO           |                | GP19       |
+| GP13       | nCS            |                | GP18       |
+| GND        | <ground> | <ground> | GND        |
+| GP14       | SCLK           |                | GP17       |
+| GP15       | MOSI           |                | GP16       |
+| <end>| <bottom> | <bottom> | <end>|
 
 On the RP2040, two USB CDC interfaces are exposed: the first is the UART
 interface, the second is for Serprog. If you have no other USB CDC devices,
@@ -120,15 +123,20 @@ libco is licensed under the [ISC license](https://opensource.org/licenses/ISC)
 
 - [x] CMSIS-DAP JTAG implementation
 - [x] Flashrom/SPI support using Serprog
+  - [ ] Parallel ROM flashing support, too, by having the device switch into a
+        separate mode that temporarily disables all other IO protocols
 - [ ] UART with CTS/RTS flow control
+  - Needs configurable stuff as well, as some UART interfaces won't use this.
+- [ ] Debug interface to send printf stuff directly to USB, instead of having
+-     to use the UART interface as a loopback thing.
 - [ ] I2C support by emulating the I2C Tiny USB
   - [ ] Expose RP2040-internal temperature ADC on I2C-over-USB bus?
   - Does SMBus stuff need special treatment here?
-- [ ] Maybe add some way of reconfiguring features while the device is running.
-      Eg. CTS/RTS enable/disable, temperature ADC I2C address, ...
-  - Maybe use the Serprog USB serial interface for this, with some extension
-    commands not typically used for Serprog.
+- [ ] Maybe use the ADCs for something?
 - [ ] AVR programming (USBavr emulation?)
+  - AVR ISP is hardly used anymore
+  - TPI/UPDI requires 5V levels, Pico doesn't do that :/
+  - debugWIRE????
 - Renesas E7-{0,1,2} programming thing????
   - Renesas tell us how this works pls
 - Maybe steal other features from the Bus Pirate or Glasgow or so

bsp/rp2040/cdc_uart.c

@@ -67,6 +67,10 @@ void cdc_uart_task(void) {
     }
 }
 
+void cdc_uart_set_hwflow(bool enable) {
+    uart_set_hw_flow(PICOPROBE_UART_INTERFACE, enable, enable);
+}
+
 void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* line_coding) {
     picoprobe_info("New baud rate %d\n", line_coding->bit_rate);
     uart_init(PICOPROBE_UART_INTERFACE, line_coding->bit_rate);

bsp/rp2040/picoprobe_config.h

@@ -55,6 +55,8 @@
 // UART config
 #define PICOPROBE_UART_TX 4
 #define PICOPROBE_UART_RX 5
+#define PICOPROBE_UART_CTS 10
+#define PICOPROBE_UART_RTS 11
 #define PICOPROBE_UART_INTERFACE uart1
 #define PICOPROBE_UART_BAUDRATE 115200
 
@@ -68,8 +70,8 @@
 
 // SPI config
 #define PROBE_SPI_DEV spi1
-#define PROBE_SPI_SCLK 10
-#define PROBE_SPI_MOSI 11
+#define PROBE_SPI_SCLK 14
+#define PROBE_SPI_MOSI 15
 #define PROBE_SPI_MISO 12
 #define PROBE_SPI_nCS  13
 

protos.h

@@ -5,8 +5,12 @@
 #include "protocfg.h"
 
 #ifdef DBOARD_HAS_UART
+#include <stdbool.h>
+
 void cdc_uart_init(void);
 void cdc_uart_task(void);
+
+void cdc_uart_set_hwflow(bool enable);
 #endif
 
 #ifdef DBOARD_HAS_SERPROG