some weird behaviour with the NRF not toggling the reset pin correctly

CMakeLists.txt

@@ -1,7 +1,16 @@
 cmake_minimum_required(VERSION 3.20.0)
 
+if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/${BOARD}.overlay")
+  set(mcuboot_DTC_OVERLAY_FILE "${CMAKE_CURRENT_SOURCE_DIR}/${BOARD}.overlay")
+endif()
+
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+#
+# set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror")
+# set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
+# set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2")
+
 project(passr)
 
 target_sources(app PRIVATE src/main.c)

Makefile

@@ -1,12 +1,13 @@
 .ONESHELL:
 
-TARGET=rpi_pico
+TARGET=nrf52840dk_nrf52840
 
 CMAKE_ZEPHYR_PATH=../zephyrproject/zephyr
 CMAKE_ZEPHYR_COMMAND=west build
 CMAKE_ZEPHYR_FLAGS=-b $(TARGET)
 
-all: compile flash_pico
+all: compile flash listen
+cf: compile flash
 
 setup:
 	west init
@@ -14,18 +15,17 @@ setup:
 
 compile:
 	$(CMAKE_ZEPHYR_COMMAND) $(CMAKE_ZEPHYR_FLAGS)
-	cp build/zephyr/zephyr.uf2 ./zephyr.uf2
-	echo "Copied zephyr.uf2 to project root"
 
-flash_pico:
-	# mount then copy the uf2
-	sudo mount -L RPI-RP2 /mnt
-	sudo cp zephyr.uf2 /mnt
-	echo "Copied zephyr.uf2 to pico"
+flash: compile
+	cp build/zephyr/zephyr.hex ./zephyr.hex
+	echo "Copied zephyr.hex to project root"
+	nrfjprog -f nrf52 --program zephyr.hex --sectorerase --verify --reset
 
-# FIXME: This is entirely board specific, for example the pi pico will vibe differently
-flash:
-	west flash
+listen: flash
+	minicom -D /dev/ttyACM0 -b 115200
+
+com:
+	minicom -D /dev/ttyACM0 -b 115200
 
 clean:
 	rm -rf build/

boards/nrf52840dk_nrf52840.overlay

@@ -0,0 +1,31 @@
+&pinctrl {
+	spi_master_default: spi_master_default {
+		group1 {
+			psels = <NRF_PSEL(SPIM_SCK, 0, 31)>,
+					<NRF_PSEL(SPIM_MOSI, 0, 30)>,
+					<NRF_PSEL(SPIM_MISO, 0, 29)>;
+		};
+	};
+
+	spi_master_sleep: spi_master_sleep {
+		group1 {
+			psels = <NRF_PSEL(SPIM_SCK, 0, 31)>,
+					<NRF_PSEL(SPIM_MOSI, 0, 30)>,
+					<NRF_PSEL(SPIM_MISO, 0, 29)>;
+			low-power-enable;
+		};
+	};
+};
+
+spi_master: &spi3 {
+	compatible = "nordic,nrf-spim";
+	status = "okay";
+	pinctrl-0 = <&spi_master_default>;
+	pinctrl-1 = <&spi_master_sleep>;
+	pinctrl-names = "default", "sleep";
+	cs-gpios = <&gpio0 28 GPIO_ACTIVE_LOW>;
+	reg_spi_master: spi-dev-a@0 {
+		reg = <0>;
+	};
+};
+

buildflash.sh

@@ -1,5 +0,0 @@
-west build -b adafruit_feather_nrf52840 .
-# nrfutil dfu genpkg --application build/zephyr/zephyr.hex --application-version 0xFF --dev-revision 0xFF --dev-type 0xFFFF --sd-req 0x81 feather_nrf52840_express_bootloader-0.7.0_s140_6.1.1.zip
-# nrfutil dfu usb-serial -pkg app.zip -p ttyACM0 // DO NOT FUCKING DO THIS
-# ./uf2conv.py build/zephyr/zephyr.hex -c -f 0xADA52840
-cp build/zephyr/zephyr.uf2 .

feather_bootloader/manifest.json

@@ -1,20 +0,0 @@
-{
-    "manifest": {
-        "dfu_version": 0.5,
-        "softdevice_bootloader": {
-            "bin_file": "sd_bl.bin",
-            "bl_size": 39000,
-            "dat_file": "sd_bl.dat",
-            "init_packet_data": {
-                "application_version": 4294967295,
-                "device_revision": 52840,
-                "device_type": 82,
-                "firmware_crc16": 40783,
-                "softdevice_req": [
-                    65534
-                ]
-            },
-            "sd_size": 151016
-        }
-    }
-}

prj.conf

@@ -1,4 +1,6 @@
-CONFIG_BUILD_OUTPUT_UF2=y
 CONFIG_GPIO=y
+
+CONFIG_SPI=y
 CONFIG_SPI_ASYNC=y
-CONFIG_SPI_PL022_INTERRUPT=y
+
+CONFIG_SPI_SLAVE=y

src/main.c

@@ -1,45 +1,111 @@
+#include <stdint.h>
 #include <zephyr/kernel.h>
-#include <zephyr/drivers/gpio.h>
 #include <zephyr/device.h>
 #include <zephyr/devicetree.h>
+#include <zephyr/drivers/gpio.h>
 #include <zephyr/drivers/spi.h>
 
-// SPI Master Interface on SPI1 of the rp2040
-const struct device* spi1_dev = DEVICE_DT_GET(DT_NODELABEL(spi1));
+#include "nrf_gpio.h"
 
-// SPI but broken out
-#define	EPD_RST_PIN = 12;
-#define	EEPD_DC_PIN = 8;
-#define	EEPD_BUSY_PIN = 13;
-#define	EEPD_CS_PIN = 9;
-#define	EEPD_CLK_PIN = 10;
-#define	EEPD_MOSI_PIN = 11;
+/* 1000 msec = 1 sec */
+#define SLEEP_TIME_MS   100
 
-// GPIO - so we can have a status LED
+/* The devicetree node identifier for the "led0" alias. */
 #define LED0_NODE DT_ALIAS(led0)
+#define SPI_MASTER DT_NODELABEL(spi_master)
+#define RST_PAPER NRF_GPIO_PIN_MAP(0, 4)
+
+// SPI
+const struct device *spi_dev;
+static struct k_poll_signal spi_done_sig = K_POLL_SIGNAL_INITIALIZER(spi_done_sig);
+
+struct spi_cs_control spim_cs = {
+	.gpio = SPI_CS_GPIOS_DT_SPEC_GET(DT_NODELABEL(reg_spi_master)),
+	.delay = 0,
+};
+
+static void spi_init(void)
+{
+	spi_dev = DEVICE_DT_GET(SPI_MASTER);
+	if(!device_is_ready(spi_dev)) {
+		printk("SPI master device not ready!\n");
+	}
+	if(!device_is_ready(spim_cs.gpio.port)){
+		printk("SPI master chip select device not ready!\n");
+	}
+}
+
+static const struct spi_config spi_cfg = {
+	.operation = SPI_WORD_SET(8) | SPI_TRANSFER_MSB,
+	.frequency = 4000000,
+	.slave = 0,
+	.cs = &spim_cs,
+};
+
+static int spi_write_8(uint8_t command) {
+    const struct spi_buf tx_buf = {
+        .buf = &command,
+        .len = sizeof(command)
+    };
+
+    const struct spi_buf_set tx = {
+        .buffers = &tx_buf,
+        .count = 1
+    };
+
+    k_poll_signal_reset(&spi_done_sig);
+    int error = spi_write(spi_dev, &spi_cfg, &tx);
+    if(error != 0){
+        printk("SPI write error: %i\n", error);
+        return error;
+    }
+}
+
+static int spi_write_buf(uint8_t* buf, int len) {
+    const struct spi_buf tx_buf = {
+        .buf = buf,
+        .len = len
+    };
+
+    const struct spi_buf_set tx = {
+        .buffers = &tx_buf,
+        .count = 1
+    };
+
+    k_poll_signal_reset(&spi_done_sig);
+    int error = spi_write(spi_dev, &spi_cfg, &tx);
+    if(error != 0){
+        printk("SPI write error: %i\n", error);
+        return error;
+    }
+}
+
 static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
 
 void main(void)
 {
-    while (!device_is_ready(spi1_dev)) {
-        
-    }
-
 	if (!device_is_ready(led.port)) {
 		return;
 	}
 
 	int ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
+	ret += nrf_gpio_cfg_output(RST_PAPER);
 	if (ret < 0) {
 		return;
 	}
 
-	while (1) {
-		ret = gpio_pin_toggle_dt(&led);
-		if (ret < 0) {
-			return;
-		}
-		k_msleep(500);
-	}
-}
+	spi_init();
 
+    gpio_pin_set_dt(&rst, 0);
+    k_msleep(SLEEP_TIME_MS);
+    gpio_pin_set_dt(&rst, 1);
+
+    k_msleep(SLEEP_TIME_MS);
+    spi_write_8(0x12);
+    k_msleep(SLEEP_TIME_MS);
+
+	while (1) {
+	    gpio_pin_toggle_dt(&led);
+		k_msleep(SLEEP_TIME_MS);
+    }
+}