IT FUCKING WORKSSSSSSS

boards/nrf52840dk_nrf52840.overlay

@@ -15,25 +15,6 @@
 			low-power-enable;
 		};
 	};
-
-	spi_slave_default: spi_slave_default {
-		group1 {
-			psels = <NRF_PSEL(SPIS_SCK, 1, 1)>,
-					<NRF_PSEL(SPIS_MOSI, 1, 2)>,
-					<NRF_PSEL(SPIS_MISO, 1, 3)>,
-					<NRF_PSEL(SPIS_CSN, 1, 4)>;
-		};
-	};
-
-	spi_slave_sleep: spi_slave_sleep {
-		group1 {
-			psels = <NRF_PSEL(SPIS_SCK, 1, 1)>,
-					<NRF_PSEL(SPIS_MOSI, 1, 2)>,
-					<NRF_PSEL(SPIS_MISO, 1, 3)>,
-					<NRF_PSEL(SPIS_CSN, 1, 4)>;
-			low-power-enable;
-		};
-	};
 };
 
 my_spi_master: &spi3 {
@@ -48,16 +29,3 @@ my_spi_master: &spi3 {
 	};
 };
 
-my_spi_slave: &spi1 {
-	compatible = "nordic,nrf-spis";
-	status = "okay";
-	pinctrl-0 = <&spi_slave_default>;
-	pinctrl-1 = <&spi_slave_sleep>;
-	pinctrl-names = "default", "sleep";
-	def-char = <0x00>;
-};
-
-// By default uart1 will occupy P1.01 and P1.02. In order to make these pins available, disable uart1
-&uart1 {
-	status="disabled";
-};

src/main.c

@@ -5,7 +5,7 @@
 #include <zephyr/drivers/spi.h>
 
 /* 1000 msec = 1 sec */
-#define SLEEP_TIME_MS   1000
+#define SLEEP_TIME_MS   100
 
 /* The devicetree node identifier for the "led0" alias. */
 #define LED0_NODE DT_ALIAS(led0)
@@ -36,7 +36,7 @@ static void spi_init(void)
 
 static const struct spi_config spi_cfg = {
 	.operation = SPI_WORD_SET(8) | SPI_TRANSFER_MSB |
-				 SPI_MODE_CPOL | SPI_MODE_CPHA,
+				 SPI_MODE_CPHA,
 	.frequency = 4000000,
 	.slave = 0,
 	.cs = &spim_cs,
@@ -72,20 +72,14 @@ static int spi_write_test_msg(void)
 
 	// Reset signal
 	k_poll_signal_reset(&spi_done_sig);
-
 	// Start transaction
+
 	int error = spi_transceive_async(spi_dev, &spi_cfg, &tx, &rx, &spi_done_sig);
 	if(error != 0){
 		printk("SPI transceive error: %i\n", error);
 		return error;
 	}
 
-	// Wait for the done signal to be raised and log the rx buffer
-	int spi_signaled, spi_result;
-	do{
-		k_poll_signal_check(&spi_done_sig, &spi_signaled, &spi_result);
-	} while(spi_signaled == 0);
-	printk("SPI RX: 0x%.2x, 0x%.2x\n", rx_buffer[0], rx_buffer[1]);
 	return 0;
 }
 
@@ -93,72 +87,6 @@ static int spi_write_test_msg(void)
 const struct device *spi_slave_dev;
 static struct k_poll_signal spi_slave_done_sig = K_POLL_SIGNAL_INITIALIZER(spi_slave_done_sig);
 
-static const struct spi_config spi_slave_cfg = {
-	.operation = SPI_WORD_SET(8) | SPI_TRANSFER_MSB |
-				 SPI_MODE_CPOL | SPI_MODE_CPHA | SPI_OP_MODE_SLAVE,
-	.frequency = 4000000,
-	.slave = 0,
-};
-
-static void spi_slave_init(void)
-{
-	spi_slave_dev = DEVICE_DT_GET(MY_SPI_SLAVE);
-	if(!device_is_ready(spi_dev)) {
-		printk("SPI slave device not ready!\n");
-	}
-}
-
-static uint8_t slave_tx_buffer[2];
-static uint8_t slave_rx_buffer[2];
-static int spi_slave_write_test_msg(void)
-{
-	static uint8_t counter = 0;
-
-
-	const struct spi_buf s_tx_buf = {
-		.buf = slave_tx_buffer,
-		.len = sizeof(slave_tx_buffer)
-	};
-	const struct spi_buf_set s_tx = {
-		.buffers = &s_tx_buf,
-		.count = 1
-	};
-
-	struct spi_buf s_rx_buf = {
-		.buf = slave_rx_buffer,
-		.len = sizeof(slave_rx_buffer),
-	};
-	const struct spi_buf_set s_rx = {
-		.buffers = &s_rx_buf,
-		.count = 1
-	};
-
-	// Update the TX buffer with a rolling counter
-	slave_tx_buffer[1] = counter++;
-	printk("SPI SLAVE TX: 0x%.2x, 0x%.2x\n", slave_tx_buffer[0], slave_tx_buffer[1]);
-
-	// Reset signal
-	k_poll_signal_reset(&spi_slave_done_sig);
-
-	// Start transaction
-	int error = spi_transceive_async(spi_slave_dev, &spi_slave_cfg, &s_tx, &s_rx, &spi_slave_done_sig);
-	if(error != 0){
-		printk("SPI slave transceive error: %i\n", error);
-		return error;
-	}
-	return 0;
-}
-
-static int spi_slave_check_for_message(void)
-{
-	int signaled, result;
-	k_poll_signal_check(&spi_slave_done_sig, &signaled, &result);
-	if(signaled != 0){
-		return 0;
-	}
-	else return -1;
-}
-
 /*
  * A build error on this line means your board is unsupported.
  * See the sample documentation for information on how to fix this.
@@ -180,11 +108,9 @@ void main(void)
 
 	spi_init();
 
-	spi_slave_init();
 
 	printk("SPI master/slave example started\n");
 
-	spi_slave_write_test_msg();
 
 	while (1) {
 		spi_write_test_msg();
@@ -193,13 +119,5 @@ void main(void)
 			return;
 		}
 		k_msleep(SLEEP_TIME_MS);
-
-		if(spi_slave_check_for_message() == 0){
-			// Print the last received data
-			printk("SPI SLAVE RX: 0x%.2x, 0x%.2x\n", slave_rx_buffer[0], slave_rx_buffer[1]);
-
-			// Prepare the next SPI slave transaction
-			spi_slave_write_test_msg();
-		}
-	}
+    }
 }