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Message-Id: <20190128161306.27805-9-ben.whitten@lairdtech.com>
Date: Mon, 28 Jan 2019 16:13:02 +0000
From: Ben Whitten <ben.whitten@...il.com>
To: afaerber@...e.de
Cc: linux-lpwan@...ts.infradead.org,
Ben Whitten <ben.whitten@...rdtech.com>,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH lora-next 08/11] net: lora: sx130x: add test transmission
First transmission from the SX130x, all metadata values are hardcoded
and will be replaced with a suitable alternative.
Data sent into the socket is sent straight out of the card.
Signed-off-by: Ben Whitten <ben.whitten@...rdtech.com>
---
drivers/net/lora/sx130x.c | 128 +++++++++++++++++++++++++++++++++++++-
drivers/net/lora/sx130x.h | 11 ++++
2 files changed, 137 insertions(+), 2 deletions(-)
diff --git a/drivers/net/lora/sx130x.c b/drivers/net/lora/sx130x.c
index 820ec0220e28..f96f32d2e1ff 100644
--- a/drivers/net/lora/sx130x.c
+++ b/drivers/net/lora/sx130x.c
@@ -49,8 +49,50 @@ static const struct reg_field sx130x_regmap_fields[] = {
/* EMERGENCY_FORCE_HOST_CTRL */
[F_EMERGENCY_FORCE_HOST_CTRL] =
REG_FIELD(SX1301_EMERGENCY_FORCE_HOST_CTRL, 0, 0),
+ /* TX_TRIG */
+ [F_TX_TRIG_IMMEDIATE] = REG_FIELD(SX1301_TX_TRIG, 0, 0),
+ [F_TX_TRIG_DELAYED] = REG_FIELD(SX1301_TX_TRIG, 1, 1),
+ [F_TX_TRIG_GPS] = REG_FIELD(SX1301_TX_TRIG, 2, 2),
};
+struct sx130x_tx_header {
+ u8 tx_freq[3];
+ u32 start;
+ u8 tx_power:4,
+ modulation_type:1,
+ radio_select:1,
+ resered0:2;
+ u8 reserved1;
+
+ union {
+ struct lora_t {
+ u8 sf:4,
+ cr:3,
+ crc16_en:1;
+ u8 payload_len;
+ u8 mod_bw:2,
+ implicit_header:1,
+ ppm_offset:1,
+ invert_pol:1,
+ reserved0:3;
+ u16 preamble;
+ u8 reserved1;
+ u8 reserved2;
+ } lora;
+ struct fsk_t {
+ u8 freq_dev;
+ u8 payload_len;
+ u8 packet_mode:1,
+ crc_en:1,
+ enc_mode:2,
+ crc_mode:1,
+ reserved0:3;
+ u16 preamble;
+ u16 bitrate;
+ } fsk;
+ } u;
+} __packed;
+
struct sx130x_tx_gain_lut {
s8 power; /* dBm measured at board connector */
u8 dig_gain;
@@ -646,6 +688,83 @@ static int sx130x_agc_init(struct sx130x_priv *priv)
return ret;
}
+static int sx130x_tx(struct sx130x_priv *priv, void *data, int len)
+{
+ int ret, i;
+ u8 buff[256 + 16];
+ struct sx130x_tx_header *hdr = (struct sx130x_tx_header *)buff;
+ struct net_device *netdev = dev_get_drvdata(priv->dev);
+
+ /* TODO general checks to make sure we CAN send */
+
+ /* TODO Enable notch filter for lora 125 */
+
+ /* TODO get start delay for this TX */
+
+ /* TODO interpret tx power, HACK just set max power */
+
+ /* TODO get TX imbalance for this pow index from calibration step */
+
+ /* TODO set the dig gain */
+
+ /* TODO set TX PLL freq based on radio used to TX */
+
+ memset(buff, 0, sizeof(buff));
+
+ /* HACK set to 868MHz */
+ hdr->tx_freq[0] = 217;
+ hdr->tx_freq[1] = 0;
+ hdr->tx_freq[2] = 0;
+
+ hdr->start = 0; /* Start imediatly */
+ hdr->radio_select = 0; /* HACK Radio A transmit */
+ hdr->modulation_type = 0; /* HACK modulation LORA */
+ hdr->tx_power = 15; /* HACK power entry 15 */
+
+ hdr->u.lora.crc16_en = 1; /* Enable CRC16 */
+ hdr->u.lora.cr = 1; /* CR 4/5 */
+ hdr->u.lora.sf = 7; /* SF7 */
+ hdr->u.lora.payload_len = len; /* Set the data len to the skb len */
+ hdr->u.lora.implicit_header = 0; /* No implicit header */
+ hdr->u.lora.mod_bw = 0; /* Set 125KHz BW */
+ hdr->u.lora.ppm_offset = 0; /* TODO no ppm offset? */
+ hdr->u.lora.invert_pol = 0; /* TODO set no inverted polarity */
+
+ hdr->u.lora.preamble = 8; /* Set the standard preamble */
+
+ /* TODO 2 Msb in tx_freq0 for large narrow filtering, unset for now */
+ hdr->tx_freq[0] &= 0x3F;
+
+ /* Copy the TX data into the buffer ready to go */
+
+ memcpy((void *)&buff[16], data, len);
+
+ /* Reset any transmissions */
+ ret = regmap_write(priv->regmap, SX1301_TX_TRIG, 0);
+ if (ret)
+ return ret;
+
+ /* Put the buffer into the tranmit fifo */
+ ret = regmap_write(priv->regmap, SX1301_TX_DATA_BUF_ADDR, 0);
+ if (ret)
+ return ret;
+ ret = regmap_noinc_write(priv->regmap, SX1301_TX_DATA_BUF_DATA, buff,
+ len + 16);
+ if (ret)
+ return ret;
+
+ /* HACK just go for immediate transfer */
+ ret = sx130x_field_force_write(priv, F_TX_TRIG_IMMEDIATE, 1);
+ if (ret)
+ return ret;
+
+ netdev_dbg(netdev, "Transmitting packet of size %d: ", len);
+ for (i = 0; i < len + 16; i++)
+ netdev_dbg(netdev, "%X", buff[i]);
+
+ return ret;
+}
+
static netdev_tx_t sx130x_loradev_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct sx130x_priv *priv = netdev_priv(netdev);
@@ -672,8 +791,13 @@ static void sx130x_tx_work_handler(struct work_struct *ws)
netdev_dbg(netdev, "%s\n", __func__);
if (priv->tx_skb) {
-
- /* TODO actual tx* */
+ ret = sx130x_tx(priv, priv->tx_skb->data, priv->tx_skb->len);
+ if (ret) {
+ netdev->stats.tx_errors++;
+ } else {
+ netdev->stats.tx_packets++;
+ netdev->stats.tx_bytes += priv->tx_skb->len;
+ }
if (!(netdev->flags & IFF_ECHO) ||
priv->tx_skb->pkt_type != PACKET_LOOPBACK ||
diff --git a/drivers/net/lora/sx130x.h b/drivers/net/lora/sx130x.h
index 2878dd3cc547..38f1b58b2165 100644
--- a/drivers/net/lora/sx130x.h
+++ b/drivers/net/lora/sx130x.h
@@ -32,6 +32,10 @@
/* Page independent */
#define SX1301_PAGE 0x00
#define SX1301_VER 0x01
+#define SX1301_RX_DATA_BUF_ADDR 0x02 /* 16 wide */
+#define SX1301_RX_DATA_BUF_DATA 0x04
+#define SX1301_TX_DATA_BUF_ADDR 0x05
+#define SX1301_TX_DATA_BUF_DATA 0x06
#define SX1301_MPA 0x09
#define SX1301_MPD 0x0A
#define SX1301_GEN 0x10
@@ -49,6 +53,9 @@
#define SX1301_FORCE_CTRL (SX1301_PAGE_BASE(0) + 0x69)
#define SX1301_MCU_CTRL (SX1301_PAGE_BASE(0) + 0x6A)
+/* Page 1 */
+#define SX1301_TX_TRIG (SX1301_PAGE_BASE(1) + 0x21)
+
/* Page 2 */
#define SX1301_RADIO_A_SPI_DATA (SX1301_PAGE_BASE(2) + 0x21)
#define SX1301_RADIO_A_SPI_DATA_RB (SX1301_PAGE_BASE(2) + 0x22)
@@ -87,6 +94,10 @@ enum sx130x_fields {
F_FORCE_DEC_FILTER_GAIN,
F_EMERGENCY_FORCE_HOST_CTRL,
+
+ F_TX_TRIG_IMMEDIATE,
+ F_TX_TRIG_DELAYED,
+ F_TX_TRIG_GPS,
};
struct regmap *sx130x_get_regmap(struct device *dev);
--
2.17.1
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