[rtems commit] dev/sc16is752: Add RS485 mode variants
Sebastian Huber
sebh at rtems.org
Fri Jun 14 05:36:25 UTC 2019
Module: rtems
Branch: master
Commit: 6ff1da40c7688a880920c3f4b0f1d530775c315c
Changeset: http://git.rtems.org/rtems/commit/?id=6ff1da40c7688a880920c3f4b0f1d530775c315c
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Fri Jun 14 07:35:21 2019 +0200
dev/sc16is752: Add RS485 mode variants
---
cpukit/dev/serial/sc16is752-regs.h | 3 +++
cpukit/dev/serial/sc16is752.c | 20 ++++++++++++++++----
cpukit/include/dev/serial/sc16is752.h | 13 ++++++++++++-
3 files changed, 31 insertions(+), 5 deletions(-)
diff --git a/cpukit/dev/serial/sc16is752-regs.h b/cpukit/dev/serial/sc16is752-regs.h
index b07e489..b74f5aa 100644
--- a/cpukit/dev/serial/sc16is752-regs.h
+++ b/cpukit/dev/serial/sc16is752-regs.h
@@ -68,6 +68,8 @@ extern "C" {
#define SC16IS752_EFCR_RS485_ENABLE (1u << 0)
#define SC16IS752_EFCR_RX_DISABLE (1u << 1)
#define SC16IS752_EFCR_TX_DISABLE (1u << 2)
+#define SC16IS752_EFCR_RTSCON (1u << 4)
+#define SC16IS752_EFCR_RTSINVER (1u << 5)
/* IER */
#define SC16IS752_IER_RHR (1u << 0)
@@ -91,6 +93,7 @@ extern "C" {
#define SC16IS752_LCR_2_STOP_BIT (1u << 2)
#define SC16IS752_LCR_SET_PARITY (1u << 3)
#define SC16IS752_LCR_EVEN_PARITY (1u << 4)
+#define SC16IS752_LCR_BREAK (1u << 5)
#define SC16IS752_LCR_ENABLE_DIVISOR (1u << 7)
/* LSR */
diff --git a/cpukit/dev/serial/sc16is752.c b/cpukit/dev/serial/sc16is752.c
index a58b87b..5384563 100644
--- a/cpukit/dev/serial/sc16is752.c
+++ b/cpukit/dev/serial/sc16is752.c
@@ -212,6 +212,7 @@ static bool sc16is752_first_open(
{
bool ok;
uint8_t fcr;
+ uint8_t efcr;
(void)args;
sc16is752_context *ctx = (sc16is752_context *)base;
@@ -223,12 +224,23 @@ static bool sc16is752_first_open(
return ok;
}
- if (ctx->mode == SC16IS752_MODE_RS485) {
- ctx->efcr = SC16IS752_EFCR_RS485_ENABLE;
- } else {
- ctx->efcr = 0;
+ efcr = 0;
+
+ switch (ctx->mode) {
+ case SC16IS752_MODE_RS485_RTS_INV:
+ efcr |= SC16IS752_EFCR_RTSINVER;
+ /* Fall through */
+ case SC16IS752_MODE_RS485_RTS:
+ efcr |= SC16IS752_EFCR_RTSCON;
+ /* Fall through */
+ case SC16IS752_MODE_RS485:
+ efcr |= SC16IS752_EFCR_RS485_ENABLE;
+ break;
+ default:
+ break;
}
+ ctx->efcr = efcr;
write_reg(ctx, SC16IS752_FCR, &ctx->efcr, 1);
fcr = SC16IS752_FCR_FIFO_EN
diff --git a/cpukit/include/dev/serial/sc16is752.h b/cpukit/include/dev/serial/sc16is752.h
index 67c2e00..ea8ba70 100644
--- a/cpukit/include/dev/serial/sc16is752.h
+++ b/cpukit/include/dev/serial/sc16is752.h
@@ -31,7 +31,18 @@ extern "C" {
typedef enum {
SC16IS752_MODE_RS232,
- SC16IS752_MODE_RS485
+
+ /* Enable RS485 mode */
+ SC16IS752_MODE_RS485,
+
+ /* Enable RS485 mode, enable the transmitter to control the #RTS pin */
+ SC16IS752_MODE_RS485_RTS,
+
+ /*
+ * Enable RS485 mode, enable the transmitter to control the #RTS pin, invert
+ * RTS signal (#RTS = 1 during transmission and #RTS = 0 during reception)
+ */
+ SC16IS752_MODE_RS485_RTS_INV
} sc16is752_mode;
typedef struct sc16is752_context sc16is752_context;
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