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MCUXpresso: Update the MXRT Serial driver for MBED_TICKLESS 

We should not block in case the UART is busy transmitting. The
API has been updated to check the status of all UART's and return
1 in case any of them is busy transmitting.

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
pull/11412/head
Mahesh Mahadevan 2019-09-04 11:15:54 -05:00
parent b30e294ba1
commit 31da8ff09f
1 changed files with 56 additions and 6 deletions
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62
targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/serial_api.c
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@ -316,14 +316,64 @@ const PinMap *serial_rts_pinmap()
return PinMap_UART_RTS;
}
void serial_wait_tx_complete(uint32_t uart_index)
static int serial_is_enabled(uint32_t uart_index)
{
LPUART_Type *base = uart_addrs[uart_index];
/* Wait till data is flushed out of transmit buffer */
while (!(kLPUART_TransmissionCompleteFlag & LPUART_GetStatusFlags((LPUART_Type *)base)))
{
int clock_enabled = 0;
switch (uart_index) {
case 0:
clock_enabled = (CCM->CCGR5 & CCM_CCGR5_CG12_MASK) >> CCM_CCGR5_CG12_SHIFT;
break;
case 1:
clock_enabled = (CCM->CCGR0 & CCM_CCGR0_CG14_MASK) >> CCM_CCGR0_CG14_SHIFT;
break;
case 2:
clock_enabled = (CCM->CCGR0 & CCM_CCGR0_CG6_MASK) >> CCM_CCGR0_CG6_SHIFT;
break;
case 3:
clock_enabled = (CCM->CCGR1 & CCM_CCGR1_CG12_MASK) >> CCM_CCGR1_CG12_SHIFT;
break;
case 4:
clock_enabled = (CCM->CCGR3 & CCM_CCGR3_CG1_MASK) >> CCM_CCGR3_CG1_SHIFT;
break;
case 5:
clock_enabled = (CCM->CCGR3 & CCM_CCGR3_CG3_MASK) >> CCM_CCGR3_CG3_SHIFT;
break;
case 6:
clock_enabled = (CCM->CCGR5 & CCM_CCGR5_CG13_MASK) >> CCM_CCGR5_CG13_SHIFT;
break;
case 7:
clock_enabled = (CCM->CCGR6 & CCM_CCGR6_CG7_MASK) >> CCM_CCGR6_CG7_SHIFT;
break;
default:
break;
}
return clock_enabled;
}
bool serial_check_tx_ongoing()
{
LPUART_Type *base;
int i;
bool uart_tx_ongoing = false;
for (i = 0; i < FSL_FEATURE_SOC_LPUART_COUNT; i++) {
/* First check if UART is enabled */
if (!serial_is_enabled(i)) {
/* UART is not enabled, check the next instance */
continue;
}
base = uart_addrs[i];
/* Check if data is waiting to be written out of transmit buffer */
if (!(kLPUART_TransmissionCompleteFlag & LPUART_GetStatusFlags((LPUART_Type *)base))) {
uart_tx_ongoing = true;
break;
}
}
return uart_tx_ongoing;
}
#endif