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stmhal: Implement support for RTS/CTS hardware flow control in UART.

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This is experimental support.  API is subject to changes.  RTS/CTS
available on UART(2) and UART(3) only.  Use as:

    uart = pyb.UART(2, 9600, flow=pyb.UART.RTS | pyb.UART.CTS)
This commit is contained in:
Damien George 2014-10-31 00:40:57 +00:00
parent 9a41b32b3f
commit 4ef67d30f1
2 changed files with 31 additions and 9 deletions
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3
stmhal/qstrdefsport.h
View File

@ -144,6 +144,7 @@ Q(baudrate)
Q(bits)
Q(stop)
Q(parity)
Q(flow)
Q(read_buf_len)
Q(buf)
Q(len)
@ -155,6 +156,8 @@ Q(any)
Q(writechar)
Q(readchar)
Q(readinto)
Q(RTS)
Q(CTS)
// for CAN class
Q(CAN)

37
stmhal/uart.c
View File

@ -115,7 +115,7 @@ void uart_deinit(void) {
}
// assumes Init parameters have been set up correctly
bool uart_init2(pyb_uart_obj_t *uart_obj) {
STATIC bool uart_init2(pyb_uart_obj_t *uart_obj) {
USART_TypeDef *UARTx;
IRQn_Type irqn;
uint32_t GPIO_Pin;
@ -140,7 +140,7 @@ bool uart_init2(pyb_uart_obj_t *uart_obj) {
__USART1_CLK_ENABLE();
break;
// USART2 is on PA2/PA3 (CK on PA4), PD5/PD6 (CK on PD7)
// USART2 is on PA2/PA3 (CTS,RTS,CK on PA0,PA1,PA4), PD5/PD6 (CK on PD7)
case PYB_UART_2:
UARTx = USART2;
irqn = USART2_IRQn;
@ -149,10 +149,17 @@ bool uart_init2(pyb_uart_obj_t *uart_obj) {
GPIO_Port = GPIOA;
GPIO_Pin = GPIO_PIN_2 | GPIO_PIN_3;
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_RTS) {
GPIO_Pin |= GPIO_PIN_1;
}
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_CTS) {
GPIO_Pin |= GPIO_PIN_0;
}
__USART2_CLK_ENABLE();
break;
// USART3 is on PB10/PB11 (CK on PB12), PC10/PC11 (CK on PC12), PD8/PD9 (CK on PD10)
// USART3 is on PB10/PB11 (CK,CTS,RTS on PB12,PB13,PB14), PC10/PC11 (CK on PC12), PD8/PD9 (CK on PD10)
case PYB_UART_3:
UARTx = USART3;
irqn = USART3_IRQn;
@ -161,6 +168,13 @@ bool uart_init2(pyb_uart_obj_t *uart_obj) {
#if defined(PYBV3) || defined(PYBV4) | defined(PYBV10)
GPIO_Port = GPIOB;
GPIO_Pin = GPIO_PIN_10 | GPIO_PIN_11;
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_RTS) {
GPIO_Pin |= GPIO_PIN_14;
}
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_CTS) {
GPIO_Pin |= GPIO_PIN_13;
}
#else
GPIO_Port = GPIOD;
GPIO_Pin = GPIO_PIN_8 | GPIO_PIN_9;
@ -357,6 +371,7 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
{ MP_QSTR_bits, MP_ARG_INT, {.u_int = 8} },
{ MP_QSTR_parity, MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_stop, MP_ARG_INT, {.u_int = 1} },
{ MP_QSTR_flow, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_HWCONTROL_NONE} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} },
{ MP_QSTR_timeout_char, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_read_buf_len, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 64} },
@ -382,7 +397,7 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
default: init->StopBits = UART_STOPBITS_2; break;
}
init->Mode = UART_MODE_TX_RX;
init->HwFlowCtl = UART_HWCONTROL_NONE;
init->HwFlowCtl = args[4].u_int;
init->OverSampling = UART_OVERSAMPLING_16;
// init UART (if it fails, it's because the port doesn't exist)
@ -391,8 +406,8 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
}
// set timeouts
self->timeout = args[4].u_int;
self->timeout_char = args[5].u_int;
self->timeout = args[5].u_int;
self->timeout_char = args[6].u_int;
// setup the read buffer
m_del(byte, self->read_buf, self->read_buf_len << self->char_width);
@ -403,7 +418,7 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
}
self->read_buf_head = 0;
self->read_buf_tail = 0;
if (args[6].u_int <= 0) {
if (args[7].u_int <= 0) {
// no read buffer
self->read_buf_len = 0;
self->read_buf = NULL;
@ -411,8 +426,8 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
__HAL_UART_DISABLE_IT(&self->uart, UART_IT_RXNE);
} else {
// read buffer using interrupts
self->read_buf_len = args[6].u_int;
self->read_buf = m_new(byte, args[6].u_int << self->char_width);
self->read_buf_len = args[7].u_int;
self->read_buf = m_new(byte, args[7].u_int << self->char_width);
__HAL_UART_ENABLE_IT(&self->uart, UART_IT_RXNE);
HAL_NVIC_SetPriority(self->irqn, 0xd, 0xd); // next-to-next-to lowest priority
HAL_NVIC_EnableIRQ(self->irqn);
@ -595,6 +610,10 @@ STATIC const mp_map_elem_t pyb_uart_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_writechar), (mp_obj_t)&pyb_uart_writechar_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readchar), (mp_obj_t)&pyb_uart_readchar_obj },
// class constants
{ MP_OBJ_NEW_QSTR(MP_QSTR_RTS), MP_OBJ_NEW_SMALL_INT(UART_HWCONTROL_RTS) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_CTS), MP_OBJ_NEW_SMALL_INT(UART_HWCONTROL_CTS) },
};
STATIC MP_DEFINE_CONST_DICT(pyb_uart_locals_dict, pyb_uart_locals_dict_table);