Unverified Commit dc334f87 authored by Nathaniel Wesley Filardo's avatar Nathaniel Wesley Filardo Committed by GitHub
Browse files

uart: expose fifo depth counters (#3177)

parent 139af0cd
......@@ -142,6 +142,27 @@ static int l_uart_write( lua_State* L )
return 0;
}
#define DIR_RX 0
#define DIR_TX 1
static int l_uart_fifodepth( lua_State* L )
{
int id = luaL_optinteger( L, 1, 0 );
if ((id != 0) && (id != 1))
return luaL_argerror(L, 1, "Bad UART id; must be 0 or 1");
int dir = luaL_optinteger( L, 2, 0 );
if ((dir != DIR_RX) && (dir != DIR_TX))
return luaL_argerror(L, 2, "Bad direction; must be DIR_RX or DIR_TX");
int reg = READ_PERI_REG(UART_STATUS(id));
int rsh = reg >> ((dir == DIR_RX) ? UART_RXFIFO_CNT_S : UART_TXFIFO_CNT_S);
int rm = rsh & ((dir == DIR_RX) ? UART_RXFIFO_CNT : UART_TXFIFO_CNT );
lua_pushinteger(L, rm);
return 1;
}
// Module function map
LROT_BEGIN(uart, NULL, 0)
LROT_FUNCENTRY( setup, l_uart_setup )
......@@ -149,12 +170,17 @@ LROT_BEGIN(uart, NULL, 0)
LROT_FUNCENTRY( write, l_uart_write )
LROT_FUNCENTRY( on, l_uart_on )
LROT_FUNCENTRY( alt, l_uart_alt )
LROT_FUNCENTRY( fifodepth, l_uart_fifodepth )
LROT_NUMENTRY( STOPBITS_1, PLATFORM_UART_STOPBITS_1 )
LROT_NUMENTRY( STOPBITS_1_5, PLATFORM_UART_STOPBITS_1_5 )
LROT_NUMENTRY( STOPBITS_2, PLATFORM_UART_STOPBITS_2 )
LROT_NUMENTRY( PARITY_NONE, PLATFORM_UART_PARITY_NONE )
LROT_NUMENTRY( PARITY_EVEN, PLATFORM_UART_PARITY_EVEN )
LROT_NUMENTRY( PARITY_ODD, PLATFORM_UART_PARITY_ODD )
LROT_NUMENTRY( DIR_RX, DIR_RX )
LROT_NUMENTRY( DIR_TX, DIR_TX )
LROT_END(uart, NULL, 0)
......
......@@ -145,3 +145,17 @@ Write string or byte to the UART.
uart.write(0, "Hello, world\n")
```
## uart.fifodepth()
Report the depth, in bytes, of TX or RX hardware queues associated with the
UART.
#### Syntax
`uart.fifodepth(id, dir)`
#### Parameters
- `id` UART id (0 or 1).
- `dir` `uart.DIR_RX` for the RX FIFO, `uart.DIR_TX` for TX FIFO.
#### Returns
The number of bytes in the selected FIFO.
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