GPIO setup, IRQ handler setup, blink keepalive LED, delay serial usb setup.

main.c

@@ -1,11 +1,28 @@
-#include <stdio.h>
+#include "pico/stdlib.h"
+#include "hardware/gpio.h"
+#include "driver_mfrc522_interface.h"
 
-#include <driver_mfrc522_interface.h>
+#define MFRC522_CFG_IRQ_GPIO    14
+
+static mfrc522_handle_t ctx = {0};
+
+static void mfrc522_integration_irq_handler(uint gpio, uint32_t event_mask)
+{
+    (void) gpio;
+    (void) event_mask;
+
+    // Dump return value for now, we cannot do anything at the moment.
+    (void) mfrc522_irq_handler(&ctx);
+}
+
+static void mfrc522_integration_irq_init(void)
+{
+    gpio_set_irq_enabled_with_callback(MFRC522_CFG_IRQ_GPIO, GPIO_IRQ_EDGE_RISE, true,
+        mfrc522_integration_irq_handler);
+}
 
 void mfrc522_integration_init(void)
 {
-    mfrc522_handle_t ctx;
-
     DRIVER_MFRC522_LINK_INIT(&ctx, mfrc522_handle_t);
     DRIVER_MFRC522_LINK_RESET_GPIO_INIT(&ctx, mfrc522_interface_reset_gpio_init);
     DRIVER_MFRC522_LINK_RESET_GPIO_DEINIT(&ctx, mfrc522_interface_reset_gpio_deinit);
@@ -27,12 +44,33 @@ void mfrc522_integration_init(void)
     DRIVER_MFRC522_LINK_DEBUG_PRINT(&ctx, mfrc522_interface_debug_print);
     DRIVER_MFRC522_LINK_RECEIVE_CALLBACK(&ctx, mfrc522_interface_receive_callback);
 
+    mfrc522_set_interface(&ctx, MFRC522_INTERFACE_SPI);
     uint8_t init_retval = mfrc522_init(&ctx);
+
+    if (init_retval == 0) {
+        mfrc522_integration_irq_init();
+    } else {
+        printf("ERR: %s failed: %d\n", __FUNCTION__, init_retval);
+    }
+
 }
 
 int main(void)
 {
+    stdio_init_all();
+    sleep_ms(2500);
+
     printf("Hello World!\n");
 
     mfrc522_integration_init();
+
+    const uint LED_PIN = PICO_DEFAULT_LED_PIN;
+    gpio_init(LED_PIN);
+    gpio_set_dir(LED_PIN, GPIO_OUT);
+    while (true) {
+        gpio_put(LED_PIN, 1);
+        sleep_ms(250);
+        gpio_put(LED_PIN, 0);
+        sleep_ms(250);
+    }
 }

third_party/mfrc522_integration/mfrc522_rp2040_integration.c

@@ -44,7 +44,12 @@
 
 #include "driver_mfrc522_interface.h"
 
-#define MFRC522_CFG_N_GPIO  5
+#define MFRC522_CFG_RST_GPIO         9
+#define MFRC522_CFG_SPI_MISO_GPIO   12
+#define MFRC522_CFG_SPI_MOSI_GPIO   11
+#define MFRC522_CFG_SPI_CLK_GPIO    10
+#define MFRC522_CFG_SPI_SS_GPIO     13
+#define MFRC522_CFG_SPI_SPEED_MHZ   (1000 * 1000)
 
 /**
  * @brief  interface reset gpio init
@@ -55,8 +60,8 @@
  */
 uint8_t mfrc522_interface_reset_gpio_init(void)
 {
-    gpio_init(MFRC522_CFG_N_GPIO);
+    gpio_init(MFRC522_CFG_RST_GPIO);
-    gpio_set_dir(MFRC522_CFG_N_GPIO, GPIO_OUT);
+    gpio_set_dir(MFRC522_CFG_RST_GPIO, GPIO_OUT);
     return 0;
 }
 
@@ -69,7 +74,7 @@ uint8_t mfrc522_interface_reset_gpio_init(void)
  */
 uint8_t mfrc522_interface_reset_gpio_deinit(void)
 {
-    gpio_deinit(MFRC522_CFG_N_GPIO);
+    gpio_deinit(MFRC522_CFG_RST_GPIO);
     return 0;
 }
 
@@ -83,7 +88,7 @@ uint8_t mfrc522_interface_reset_gpio_deinit(void)
  */
 uint8_t mfrc522_interface_reset_gpio_write(uint8_t value)
 {
-    gpio_put(MFRC522_CFG_N_GPIO, !!value);
+    gpio_put(MFRC522_CFG_RST_GPIO, !!value);
     return 0;
 }
 
@@ -156,7 +161,13 @@ uint8_t mfrc522_interface_iic_write(uint8_t addr, uint8_t reg, uint8_t *buf, uin
  */
 uint8_t mfrc522_interface_spi_init(void)
 {
-    return 0;
+    gpio_set_function(MFRC522_CFG_SPI_MISO_GPIO, GPIO_FUNC_SPI);
+    gpio_set_function(MFRC522_CFG_SPI_MOSI_GPIO, GPIO_FUNC_SPI);
+    gpio_set_function(MFRC522_CFG_SPI_CLK_GPIO, GPIO_FUNC_SPI);
+    gpio_set_function(MFRC522_CFG_SPI_SS_GPIO, GPIO_FUNC_SPI);
+
+    uint baudrate = MFRC522_CFG_SPI_SPEED_MHZ;
+    return (baudrate == spi_init(spi0, baudrate)) ? 0 : 1;
 }
 
 /**