diff options
Diffstat (limited to 'chip/lm4/uart.c')
| -rw-r--r-- | chip/lm4/uart.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/chip/lm4/uart.c b/chip/lm4/uart.c index 13fad41be6..ad9c634947 100644 --- a/chip/lm4/uart.c +++ b/chip/lm4/uart.c @@ -11,6 +11,7 @@ #include "gpio.h" #include "lpc.h" #include "registers.h" +#include "system.h" #include "task.h" #include "uart.h" #include "util.h" @@ -32,6 +33,9 @@ void uart_tx_start(void) if (LM4_UART_IM(0) & 0x20) return; + /* Do not allow deep sleep while transmit in progress */ + disable_sleep(SLEEP_MASK_UART); + /* * Re-enable the transmit interrupt, then forcibly trigger the * interrupt. This works around a hardware problem with the @@ -45,6 +49,9 @@ void uart_tx_start(void) void uart_tx_stop(void) { LM4_UART_IM(0) &= ~0x20; + + /* Re-allow deep sleep */ + enable_sleep(SLEEP_MASK_UART); } void uart_tx_flush(void) @@ -182,14 +189,19 @@ void uart_init(void) { uint32_t mask = 0; - /* Enable UART0 and Host UART in run, sleep, and deep sleep modes. */ + /* + * Enable UART0 in run, sleep, and deep sleep modes. Enable the Host + * UART in run and sleep modes. + */ mask |= 1; + clock_enable_peripheral(CGC_OFFSET_UART, mask, CGC_MODE_DSLEEP); #ifdef CONFIG_UART_HOST mask |= (1 << CONFIG_UART_HOST); #endif - clock_enable_peripheral(CGC_OFFSET_UART, mask, CGC_MODE_ALL); + clock_enable_peripheral(CGC_OFFSET_UART, mask, + CGC_MODE_RUN | CGC_MODE_SLEEP); gpio_config_module(MODULE_UART, 1); |