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mimxrt/machine_uart: Implement a Python UART IRQ handler.

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Supported triggers are: IRQ_RXIDLE and IRQ_TXIDLE.

When IRQ_RXIDLE is set, the handler will be called 3 character times after
the data in burst stopped.

When IRQ_TXIDLE is set, the handler will be called immediately after the
data has been sent.

This commit requires a change to fsl_lpuart.c, because the existing code
does not support under-run appropriately.

The irq.flags() value is cleared only at an expected event.  Do not change
it otherwise.

Signed-off-by: robert-hh <robert@hammelrath.com>
This commit is contained in:
robert-hh 2023-09-24 21:42:06 +02:00 committed by Damien George
parent 8e1123b25b
commit b7fa4e2fc8
4 changed files with 2094 additions and 5 deletions
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2
ports/mimxrt/Makefile
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@ -132,7 +132,6 @@ SRC_HAL_IMX_C += \
$(MCU_DIR)/drivers/fsl_lpi2c.c \
$(MCU_DIR)/drivers/fsl_lpspi.c \
$(MCU_DIR)/drivers/fsl_lpspi_edma.c \
$(MCU_DIR)/drivers/fsl_lpuart.c \
$(MCU_DIR)/drivers/fsl_pit.c \
$(MCU_DIR)/drivers/fsl_pwm.c \
$(MCU_DIR)/drivers/fsl_sai.c \
@ -191,6 +190,7 @@ SRC_C += \
eth.c \
fatfs_port.c \
flash.c \
hal/fsl_lpuart.c \
hal/pwm_backport.c \
help.c \
led.c \

2013
ports/mimxrt/hal/fsl_lpuart.c Normal file
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File diff suppressed because it is too large Load Diff

83
ports/mimxrt/machine_uart.c
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@ -50,6 +50,10 @@
#define UART_INVERT_RX (2)
#define UART_INVERT_MASK (UART_INVERT_TX | UART_INVERT_RX)
#define UART_IRQ_RXIDLE (1)
#define UART_IRQ_TXIDLE (2)
#define MP_UART_ALLOWED_FLAGS (UART_IRQ_RXIDLE | UART_IRQ_TXIDLE)
typedef struct _machine_uart_obj_t {
mp_obj_base_t base;
struct _lpuart_handle handle;
@ -63,6 +67,9 @@ typedef struct _machine_uart_obj_t {
uint8_t *txbuf;
uint16_t txbuf_len;
bool new;
uint16_t mp_irq_trigger; // user IRQ trigger mask
uint16_t mp_irq_flags; // user IRQ active IRQ flags
mp_irq_obj_t *mp_irq_obj; // user IRQ object
} machine_uart_obj_t;
typedef struct _iomux_table_t {
@ -137,11 +144,21 @@ bool lpuart_set_iomux_cts(int8_t uart) {
void LPUART_UserCallback(LPUART_Type *base, lpuart_handle_t *handle, status_t status, void *userData) {
machine_uart_obj_t *self = userData;
if (kStatus_LPUART_TxIdle == status) {
uint16_t mp_irq_flags = 0;
if (status == kStatus_LPUART_TxIdle) {
self->tx_status = kStatus_LPUART_TxIdle;
mp_irq_flags = UART_IRQ_TXIDLE;
} else if (status == kStatus_LPUART_IdleLineDetected) {
mp_irq_flags = UART_IRQ_RXIDLE;
}
// Check the flags to see if the user handler should be called
if (self->mp_irq_trigger & mp_irq_flags) {
self->mp_irq_flags = mp_irq_flags;
mp_irq_handler(self->mp_irq_obj);
}
if (kStatus_LPUART_RxRingBufferOverrun == status) {
if (status == kStatus_LPUART_RxRingBufferOverrun) {
; // Ringbuffer full, deassert RTS if flow control is enabled
}
}
@ -170,16 +187,18 @@ void machine_uart_set_baudrate(mp_obj_t uart_in, uint32_t baudrate) {
{ MP_ROM_QSTR(MP_QSTR_INV_RX), MP_ROM_INT(UART_INVERT_RX) }, \
{ MP_ROM_QSTR(MP_QSTR_CTS), MP_ROM_INT(UART_HWCONTROL_CTS) }, \
{ MP_ROM_QSTR(MP_QSTR_RTS), MP_ROM_INT(UART_HWCONTROL_RTS) }, \
{ MP_ROM_QSTR(MP_QSTR_IRQ_RXIDLE), MP_ROM_INT(UART_IRQ_RXIDLE) }, \
{ MP_ROM_QSTR(MP_QSTR_IRQ_TXIDLE), MP_ROM_INT(UART_IRQ_TXIDLE) }, \
static void mp_machine_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, flow=%s, "
"rxbuf=%d, txbuf=%d, timeout=%u, timeout_char=%u, invert=%s)",
"rxbuf=%d, txbuf=%d, timeout=%u, timeout_char=%u, invert=%s, irq=%d)",
self->id, self->config.baudRate_Bps, 8 - self->config.dataBitsCount,
_parity_name[self->config.parityMode], self->config.stopBitCount + 1,
_flow_name[(self->config.enableTxCTS << 1) | self->config.enableRxRTS],
self->handle.rxRingBufferSize, self->txbuf_len, self->timeout, self->timeout_char,
_invert_name[self->invert]);
_invert_name[self->invert], self->mp_irq_trigger);
}
static void mp_machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
@ -313,12 +332,17 @@ static void mp_machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args,
#else
LPUART_Init(self->lpuart, &self->config, CLOCK_GetClockRootFreq(kCLOCK_UartClkRoot));
#endif
self->config.rxIdleType = kLPUART_IdleTypeStartBit;
self->config.rxIdleConfig = kLPUART_IdleCharacter4;
LPUART_Init(self->lpuart, &self->config, BOARD_BOOTCLOCKRUN_UART_CLK_ROOT);
LPUART_TransferCreateHandle(self->lpuart, &self->handle, LPUART_UserCallback, self);
uint8_t *buffer = m_new(uint8_t, rxbuf_len + 1);
LPUART_TransferStartRingBuffer(self->lpuart, &self->handle, buffer, rxbuf_len);
self->txbuf = m_new(uint8_t, txbuf_len); // Allocate the TX buffer.
self->txbuf_len = txbuf_len;
LPUART_EnableInterrupts(self->lpuart, kLPUART_IdleLineInterruptEnable);
// The Uart supports inverting, but not the fsl API, so it has to coded directly
// And it has to be done after LPUART_Init.
if (self->invert & UART_INVERT_RX) {
@ -356,6 +380,8 @@ static mp_obj_t mp_machine_uart_make_new(const mp_obj_type_t *type, size_t n_arg
self->timeout = 1;
self->timeout_char = 1;
self->new = true;
self->mp_irq_obj = NULL;
LPUART_GetDefaultConfig(&self->config);
// Configure board-specific pin MUX based on the hardware device number.
@ -401,6 +427,55 @@ void machine_uart_deinit_all(void) {
}
}
static mp_uint_t uart_irq_trigger(mp_obj_t self_in, mp_uint_t new_trigger) {
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
self->mp_irq_trigger = new_trigger;
return 0;
}
static mp_uint_t uart_irq_info(mp_obj_t self_in, mp_uint_t info_type) {
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
if (info_type == MP_IRQ_INFO_FLAGS) {
return self->mp_irq_flags;
} else if (info_type == MP_IRQ_INFO_TRIGGERS) {
return self->mp_irq_trigger;
}
return 0;
}
static const mp_irq_methods_t uart_irq_methods = {
.trigger = uart_irq_trigger,
.info = uart_irq_info,
};
static mp_irq_obj_t *mp_machine_uart_irq(machine_uart_obj_t *self, bool any_args, mp_arg_val_t *args) {
if (self->mp_irq_obj == NULL) {
self->mp_irq_trigger = 0;
self->mp_irq_obj = mp_irq_new(&uart_irq_methods, MP_OBJ_FROM_PTR(self));
}
if (any_args) {
// Check the handler
mp_obj_t handler = args[MP_IRQ_ARG_INIT_handler].u_obj;
if (handler != mp_const_none && !mp_obj_is_callable(handler)) {
mp_raise_ValueError(MP_ERROR_TEXT("handler must be None or callable"));
}
// Check the trigger
mp_uint_t trigger = args[MP_IRQ_ARG_INIT_trigger].u_int;
mp_uint_t not_supported = trigger & ~MP_UART_ALLOWED_FLAGS;
if (trigger != 0 && not_supported) {
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("trigger 0x%04x unsupported"), not_supported);
}
self->mp_irq_obj->handler = handler;
self->mp_irq_obj->ishard = args[MP_IRQ_ARG_INIT_hard].u_bool;
self->mp_irq_trigger = trigger;
}
return self->mp_irq_obj;
}
static mp_uint_t mp_machine_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
uint64_t t = ticks_us64() + (uint64_t)self->timeout * 1000;

1
ports/mimxrt/mpconfigport.h
View File

@ -114,6 +114,7 @@ uint32_t trng_random_u32(void);
#define MICROPY_PY_MACHINE_UART (1)
#define MICROPY_PY_MACHINE_UART_INCLUDEFILE "ports/mimxrt/machine_uart.c"
#define MICROPY_PY_MACHINE_UART_SENDBREAK (1)
#define MICROPY_PY_MACHINE_UART_IRQ (1)
#define MICROPY_PY_ONEWIRE (1)
// fatfs configuration used in ffconf.h