Merge pull request #1079 from napicella/master

Gpio access on the Raspberry pi Pico

Kernel/platform/platform-rpipico/CMakeLists.txt

@@ -37,6 +37,7 @@ add_executable(fuzix
 	swapper.c
 	tricks.S
 	core1.c
+	devgpio.c
 	usbdescriptors.c
 	../../dev/blkdev.c
 	../../dev/mbr.c

Kernel/platform/platform-rpipico/Makefile

@@ -1,6 +1,6 @@
 # Set one of these depending.
-export PICO_SDK_FETCH_FROM_GIT = yes
-#export PICO_SDK_PATH = /home/dg/src/pico/pico-sdk
+#export PICO_SDK_FETCH_FROM_GIT = yes
+export PICO_SDK_PATH = ${HOME}/.pico-sdk/sdk/1.5.1
 
 include ../../../version.mk
 

Kernel/platform/platform-rpipico/config.h

@@ -15,8 +15,10 @@
  *      CS  GPIO 5
  */
 
-#define CONFIG_RC2040
+#define CONFIG_MAKER_PI
 
+/* We have a GPIO interface */
+#define CONFIG_DEV_GPIO
 /* Enable to make ^Z dump the inode table for debug */
 #undef CONFIG_IDUMP
 /* Enable to make ^A drop back into the monitor */

Kernel/platform/platform-rpipico/devgpio.c

@@ -0,0 +1,39 @@
+#include <kernel.h>
+#include <kdata.h>
+#include <gpio.h>
+#include "picosdk.h"
+
+// Access raspberry pi pico GPIO
+int gpio_ioctl(uarg_t request, char *data) {
+  const uint8_t num_pins = 28;
+  static struct gpioreq gr;
+
+  if (request == GPIOC_COUNT) {
+    return num_pins;
+  }
+
+  if (uget(data, &gr, sizeof(struct gpioreq)) == -1) {
+    return -1;
+  }
+
+  if (gr.pin >= num_pins) {
+    udata.u_error = ENODEV;
+    return -1;
+  }
+
+  switch (request) {
+    case GPIOC_SETBYTE:
+      break;
+    case GPIOC_SET:
+      gpio_init(gr.pin);
+      gpio_set_dir(gr.pin, GPIO_OUT);
+      gpio_put(gr.pin, gr.val != 0);
+      return 0;
+      break;
+    default:
+      udata.u_error = ENODEV;
+      return -1;
+  }
+
+  return -1;
+}

Kernel/platform/platform-rpipico/devsdspi.c

@@ -23,6 +23,16 @@
 //Pico spi0 or spi1 must match GPIO pins used above.
 #define Pico_SD_SPI_MOD spi1
 
+#elif defined(CONFIG_MAKER_PI)
+// Maker pico board
+// https://www.adafruit.com/product/5160
+#define Pico_SD_SCK 10
+#define Pico_SD_TX  11
+#define Pico_SD_RX  12
+#define Pico_SD_CS  15
+
+#define Pico_SD_SPI_MOD spi1
+
 #else
 
 /* Pico SPI GPIO connected to SD SPIO - David Given's Arrangement */

Kernel/platform/platform-rpipico/picosdk.h

@@ -4,6 +4,7 @@
 #include <pico/platform.h>
 #include <hardware/gpio.h>
 #include <hardware/regs/addressmap.h>
+#include "pico/stdlib.h"
 
 #define MANGLED 1
 #include "mangle.h"

Kernel/platform/platform-rpipico/utils/picoctl.c

@@ -1,31 +1,66 @@
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <fcntl.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include <sys/gpio.h>
 #include <sys/ioctl.h>
 #include "../pico_ioctl.h"
 
-int main(int argc, char **argv)
-{
-    if (argc == 1 || strcmp(argv[1], "--help") == 0)
-    {
-        puts("usage: picoioctl [ --help ] <commmand>");
-        puts("Command list:");
-        puts("\tflash\tReset into flash mode.");
-        return 0;
+int is_valid_uint8(const char *str) {
+    char *endptr;
+    long val = strtol(str, &endptr, 10);
+
+    // check string was a number and within the range of uint8_t
+    if (*endptr == '\0' && val >= 0 && val <= UINT8_MAX) {
+        return 1;
     }
-    int fd = open("/dev/sys", O_RDWR, 0);
-    if (!fd)
-    {
-        puts("Failed to open /dev/sys.");
-        exit(1);
-    }
-    if (ioctl(fd, PICOIOC_FLASH) != 0)
-    {
-        puts("Failed to perform operation.");
-        close(fd);
-        exit(1);
-    }
-    close(fd);
     return 0;
 }
+
+int main(int argc, char **argv) {
+  if (argc == 1 || strcmp(argv[1], "--help") == 0)
+  {
+      puts("Turn on/off GPIO pins on the pico");
+      puts("Usage: picoctl <PIN> <VALUE>");
+      return 0;
+  }
+
+  if (argc != 3) {
+    fprintf(stderr, "Usage: %s <pin> <value>\n", argv[0]);
+    return 1;
+  }
+
+  if (!is_valid_uint8(argv[1])) {
+    fprintf(stderr, "Error: <pin> must be a valid uint8_t value\n");
+    return 1;
+  }
+  uint8_t pin = (uint8_t)strtoul(argv[1], NULL, 10);
+
+  if (!is_valid_uint8(argv[2])) {
+    fprintf(stderr, "Error: <value> must be a valid uint8_t value\n");
+    return 1;
+  }
+  uint8_t value = (uint8_t)strtoul(argv[2], NULL, 10);
+
+  int fd = open("/dev/gpio", O_RDWR, 0);
+  if (!fd) {
+    puts("Failed to open /dev/gpio.");
+    exit(1);
+  }
+
+  struct gpioreq gr;
+  gr.pin = pin;
+  gr.val = value;
+
+  if (ioctl(fd, GPIOC_SET, &gr) != 0) {
+    puts("Failed to perform operation.");
+    close(fd);
+    exit(1);
+  }
+
+  close(fd);
+  return 0;
+}