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stmhal: Make uart init use struct instead of array for parsing args. 

This makes it much easier to understand which arg is which, less error
prone, and simpler to add a new arg.
This commit is contained in:
Damien George 2015-12-12 15:55:51 +00:00
parent 17298af61e
commit 36ccdc952c
1 changed files with 15 additions and 12 deletions
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27
stmhal/uart.c
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@ -458,22 +458,25 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
}; };
// parse args // parse args
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; struct {
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args); mp_arg_val_t baudrate, bits, parity, stop, flow, timeout, timeout_char, read_buf_len;
} args;
mp_arg_parse_all(n_args, pos_args, kw_args,
MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t*)&args);
// set the UART configuration values // set the UART configuration values
memset(&self->uart, 0, sizeof(self->uart)); memset(&self->uart, 0, sizeof(self->uart));
UART_InitTypeDef *init = &self->uart.Init; UART_InitTypeDef *init = &self->uart.Init;
// baudrate // baudrate
init->BaudRate = args[0].u_int; init->BaudRate = args.baudrate.u_int;
// parity // parity
mp_int_t bits = args[1].u_int; mp_int_t bits = args.bits.u_int;
if (args[2].u_obj == mp_const_none) { if (args.parity.u_obj == mp_const_none) {
init->Parity = UART_PARITY_NONE; init->Parity = UART_PARITY_NONE;
} else { } else {
mp_int_t parity = mp_obj_get_int(args[2].u_obj); mp_int_t parity = mp_obj_get_int(args.parity.u_obj);
init->Parity = (parity & 1) ? UART_PARITY_ODD : UART_PARITY_EVEN; init->Parity = (parity & 1) ? UART_PARITY_ODD : UART_PARITY_EVEN;
bits += 1; // STs convention has bits including parity bits += 1; // STs convention has bits including parity
} }
@ -488,13 +491,13 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
} }
// stop bits // stop bits
switch (args[3].u_int) { switch (args.stop.u_int) {
case 1: init->StopBits = UART_STOPBITS_1; break; case 1: init->StopBits = UART_STOPBITS_1; break;
default: init->StopBits = UART_STOPBITS_2; break; default: init->StopBits = UART_STOPBITS_2; break;
} }
// flow control // flow control
init->HwFlowCtl = args[4].u_int; init->HwFlowCtl = args.flow.u_int;
// extra config (not yet configurable) // extra config (not yet configurable)
init->Mode = UART_MODE_TX_RX; init->Mode = UART_MODE_TX_RX;
@ -506,11 +509,11 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, con
} }
// set timeout // set timeout
self->timeout = args[5].u_int; self->timeout = args.timeout.u_int;
// set timeout_char // set timeout_char
// make sure it is at least as long as a whole character (13 bits to be safe) // make sure it is at least as long as a whole character (13 bits to be safe)
self->timeout_char = args[6].u_int; self->timeout_char = args.timeout_char.u_int;
uint32_t min_timeout_char = 13000 / init->BaudRate + 1; uint32_t min_timeout_char = 13000 / init->BaudRate + 1;
if (self->timeout_char < min_timeout_char) { if (self->timeout_char < min_timeout_char) {
self->timeout_char = min_timeout_char; self->timeout_char = min_timeout_char;
@ -531,7 +534,7 @@ 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_head = 0;
self->read_buf_tail = 0; self->read_buf_tail = 0;
if (args[7].u_int <= 0) { if (args.read_buf_len.u_int <= 0) {
// no read buffer // no read buffer
self->read_buf_len = 0; self->read_buf_len = 0;
self->read_buf = NULL; self->read_buf = NULL;
@ -539,7 +542,7 @@ 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); __HAL_UART_DISABLE_IT(&self->uart, UART_IT_RXNE);
} else { } else {
// read buffer using interrupts // read buffer using interrupts
self->read_buf_len = args[7].u_int + 1; // +1 to adjust for usable length of buffer self->read_buf_len = args.read_buf_len.u_int + 1; // +1 to adjust for usable length of buffer
self->read_buf = m_new(byte, self->read_buf_len << self->char_width); self->read_buf = m_new(byte, self->read_buf_len << self->char_width);
__HAL_UART_ENABLE_IT(&self->uart, UART_IT_RXNE); __HAL_UART_ENABLE_IT(&self->uart, UART_IT_RXNE);
HAL_NVIC_SetPriority(self->irqn, IRQ_PRI_UART, IRQ_SUBPRI_UART); HAL_NVIC_SetPriority(self->irqn, IRQ_PRI_UART, IRQ_SUBPRI_UART);