diff options
| author | Antonio Borneo <antonio.borneo@st.com> | 2016-07-07 12:32:36 +0200 |
|---|---|---|
| committer | Antonio Borneo <antonio.borneo@st.com> | 2017-05-30 22:51:31 +0200 |
| commit | 94eb7cea428e83f84cf4b42fb0a49d15af9e5bd3 (patch) | |
| tree | 81a6bc5c19ed2fa0596e7fdd02033fcffa101428 | |
| parent | a01ea4e28585b4548efa14eadb48c88db5f84ff1 (diff) | |
| download | contexthub-94eb7cea428e83f84cf4b42fb0a49d15af9e5bd3.tar.gz | |
nanohub: firmware: flush usart
Entering in sleep-mode freezes several clock in the device; if usart is
still transmitting, this will cause sending incorrect data.
Wait for usart to complete transmission.
Change-Id: Ide972e55b1e850d3310e935912697e9aa17a638c
Signed-off-by: Antonio Borneo <antonio.borneo@st.com>
| -rw-r--r-- | firmware/os/inc/usart.h | 1 | ||||
| -rw-r--r-- | firmware/os/platform/stm32/platform.c | 3 | ||||
| -rw-r--r-- | firmware/os/platform/stm32/usart.c | 11 |
3 files changed, 15 insertions, 0 deletions
diff --git a/firmware/os/inc/usart.h b/firmware/os/inc/usart.h index ab7a477d..1ef18e50 100644 --- a/firmware/os/inc/usart.h +++ b/firmware/os/inc/usart.h @@ -63,6 +63,7 @@ void usartOpen(struct usart* __restrict usart, UsartPort port, /* port number is UsatStopBitsCfg stop_bits, UsartParityCfg parity, UsartFlowControlCfg flow_control); void usartClose(const struct usart* __restrict usart); +void usartFlush(const struct usart* __restrict usart); void usartPutchar(const struct usart* __restrict usart, char c); #ifdef __cplusplus diff --git a/firmware/os/platform/stm32/platform.c b/firmware/os/platform/stm32/platform.c index 5c8082c4..befafe9f 100644 --- a/firmware/os/platform/stm32/platform.c +++ b/firmware/os/platform/stm32/platform.c @@ -184,6 +184,9 @@ void platEarlyLogFlush(void) void platLogFlush(void *userData) { +#ifdef DEBUG_UART_UNITNO + usartFlush(&mDbgUart); +#endif #if defined(DEBUG_LOG_EVT) if (userData && mLateBoot) osEnqueueEvtOrFree(EVENT_TYPE_BIT_DISCARDABLE | EVT_DEBUG_LOG, userData, heapFree); diff --git a/firmware/os/platform/stm32/usart.c b/firmware/os/platform/stm32/usart.c index 302cb852..26f644f9 100644 --- a/firmware/os/platform/stm32/usart.c +++ b/firmware/os/platform/stm32/usart.c @@ -144,6 +144,17 @@ void usartClose(const struct usart* __restrict usart) gpioRelease(usart->tx); } +/* + * don't use this immediately after usart initialization + * the test is valid only after the first char has been sent out + */ +void usartFlush(const struct usart* __restrict usart) +{ + struct StmUsart *block = (struct StmUsart*)mUsartPorts[usart->unit]; + + while ((block->SR & 0x00c0) != 0x00c0); +} + void usartPutchar(const struct usart* __restrict usart, char c) { struct StmUsart *block = (struct StmUsart*)mUsartPorts[usart->unit]; |