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dev/sc16is752: Add RS485 mode variants

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This commit is contained in:
Sebastian Huber
2019-06-14 07:35:21 +02:00
parent d7d0bba8cc
commit 6ff1da40c7
3 changed files with 31 additions and 5 deletions
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3
cpukit/dev/serial/sc16is752-regs.h
View File

@@ -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 */

20
cpukit/dev/serial/sc16is752.c
View File

@@ -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

13
cpukit/include/dev/serial/sc16is752.h
View File

@@ -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;