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-rw-r--r--stmhal/uart.c415
1 files changed, 415 insertions, 0 deletions
diff --git a/stmhal/uart.c b/stmhal/uart.c
new file mode 100644
index 000000000..1b0d9e1b6
--- /dev/null
+++ b/stmhal/uart.c
@@ -0,0 +1,415 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "stm32f4xx_hal.h"
+
+#include "nlr.h"
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+#include "runtime.h"
+#include "bufhelper.h"
+#include "uart.h"
+
+// Usage model:
+//
+// See usage model of I2C in i2c.c. UART is very similar. Main difference is
+// parameters to init the UART bus:
+//
+// from pyb import UART
+// uart = UART(1, 9600) # init with given baudrate
+// uart.init(9600, bits=8, stop=1, parity=None) # init with given parameters
+//
+// Bits can be 8 or 9, stop can be 1 or 2, parity can be None, 0 (even), 1 (odd).
+//
+// Extra method:
+//
+// uart.any() # returns True if any characters waiting
+
+struct _pyb_uart_obj_t {
+ mp_obj_base_t base;
+ pyb_uart_t uart_id;
+ bool is_enabled;
+ UART_HandleTypeDef uart;
+};
+
+pyb_uart_obj_t *pyb_uart_global_debug = NULL;
+
+// assumes Init parameters have been set up correctly
+bool uart_init2(pyb_uart_obj_t *uart_obj) {
+ USART_TypeDef *UARTx = NULL;
+
+ uint32_t GPIO_Pin = 0;
+ uint8_t GPIO_AF_UARTx = 0;
+ GPIO_TypeDef* GPIO_Port = NULL;
+
+ switch (uart_obj->uart_id) {
+ // USART1 is on PA9/PA10 (CK on PA8), PB6/PB7
+ case PYB_UART_1:
+ UARTx = USART1;
+ GPIO_AF_UARTx = GPIO_AF7_USART1;
+
+#if defined (PYBV4) || defined(PYBV10)
+ GPIO_Port = GPIOB;
+ GPIO_Pin = GPIO_PIN_6 | GPIO_PIN_7;
+#else
+ GPIO_Port = GPIOA;
+ GPIO_Pin = GPIO_PIN_9 | GPIO_PIN_10;
+#endif
+
+ __USART1_CLK_ENABLE();
+ break;
+
+ // USART2 is on PA2/PA3 (CK on PA4), PD5/PD6 (CK on PD7)
+ case PYB_UART_2:
+ UARTx = USART2;
+ GPIO_AF_UARTx = GPIO_AF7_USART2;
+
+ GPIO_Port = GPIOA;
+ GPIO_Pin = GPIO_PIN_2 | GPIO_PIN_3;
+
+ __USART2_CLK_ENABLE();
+ break;
+
+ // USART3 is on PB10/PB11 (CK on PB12), PC10/PC11 (CK on PC12), PD8/PD9 (CK on PD10)
+ case PYB_UART_3:
+ UARTx = USART3;
+ GPIO_AF_UARTx = GPIO_AF7_USART3;
+
+#if defined(PYBV3) || defined(PYBV4) | defined(PYBV10)
+ GPIO_Port = GPIOB;
+ GPIO_Pin = GPIO_PIN_10 | GPIO_PIN_11;
+#else
+ GPIO_Port = GPIOD;
+ GPIO_Pin = GPIO_PIN_8 | GPIO_PIN_9;
+#endif
+ __USART3_CLK_ENABLE();
+ break;
+
+ // UART4 is on PA0/PA1, PC10/PC11
+ case PYB_UART_4:
+ UARTx = UART4;
+ GPIO_AF_UARTx = GPIO_AF8_UART4;
+
+ GPIO_Port = GPIOA;
+ GPIO_Pin = GPIO_PIN_0 | GPIO_PIN_1;
+
+ __UART4_CLK_ENABLE();
+ break;
+
+ // USART6 is on PC6/PC7 (CK on PC8)
+ case PYB_UART_6:
+ UARTx = USART6;
+ GPIO_AF_UARTx = GPIO_AF8_USART6;
+
+ GPIO_Port = GPIOC;
+ GPIO_Pin = GPIO_PIN_6 | GPIO_PIN_7;
+
+ __USART6_CLK_ENABLE();
+ break;
+
+ default:
+ return false;
+ }
+
+ // init GPIO
+ GPIO_InitTypeDef GPIO_InitStructure;
+ GPIO_InitStructure.Pin = GPIO_Pin;
+ GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
+ GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
+ GPIO_InitStructure.Pull = GPIO_PULLUP;
+ GPIO_InitStructure.Alternate = GPIO_AF_UARTx;
+ HAL_GPIO_Init(GPIO_Port, &GPIO_InitStructure);
+
+ // init UARTx
+ uart_obj->uart.Instance = UARTx;
+ HAL_UART_Init(&uart_obj->uart);
+
+ uart_obj->is_enabled = true;
+
+ return true;
+}
+
+bool uart_init(pyb_uart_obj_t *uart_obj, uint32_t baudrate) {
+ UART_HandleTypeDef *uh = &uart_obj->uart;
+ memset(uh, 0, sizeof(*uh));
+ uh->Init.BaudRate = baudrate;
+ uh->Init.WordLength = UART_WORDLENGTH_8B;
+ uh->Init.StopBits = UART_STOPBITS_1;
+ uh->Init.Parity = UART_PARITY_NONE;
+ uh->Init.Mode = UART_MODE_TX_RX;
+ uh->Init.HwFlowCtl = UART_HWCONTROL_NONE;
+ uh->Init.OverSampling = UART_OVERSAMPLING_16;
+ return uart_init2(uart_obj);
+}
+
+void uart_deinit(pyb_uart_obj_t *uart_obj) {
+ uart_obj->is_enabled = false;
+ UART_HandleTypeDef *uart = &uart_obj->uart;
+ HAL_UART_DeInit(uart);
+ if (uart->Instance == USART1) {
+ __USART1_FORCE_RESET();
+ __USART1_RELEASE_RESET();
+ __USART1_CLK_DISABLE();
+ } else if (uart->Instance == USART2) {
+ __USART2_FORCE_RESET();
+ __USART2_RELEASE_RESET();
+ __USART2_CLK_DISABLE();
+ } else if (uart->Instance == USART3) {
+ __USART3_FORCE_RESET();
+ __USART3_RELEASE_RESET();
+ __USART3_CLK_DISABLE();
+ } else if (uart->Instance == UART4) {
+ __UART4_FORCE_RESET();
+ __UART4_RELEASE_RESET();
+ __UART4_CLK_DISABLE();
+ } else if (uart->Instance == USART6) {
+ __USART6_FORCE_RESET();
+ __USART6_RELEASE_RESET();
+ __USART6_CLK_DISABLE();
+ }
+}
+
+bool uart_rx_any(pyb_uart_obj_t *uart_obj) {
+ return __HAL_UART_GET_FLAG(&uart_obj->uart, UART_FLAG_RXNE);
+}
+
+int uart_rx_char(pyb_uart_obj_t *uart_obj) {
+ uint8_t ch;
+ if (HAL_UART_Receive(&uart_obj->uart, &ch, 1, 0) != HAL_OK) {
+ ch = 0;
+ }
+ return ch;
+}
+
+void uart_tx_char(pyb_uart_obj_t *uart_obj, int c) {
+ uint8_t ch = c;
+ HAL_UART_Transmit(&uart_obj->uart, &ch, 1, 100000);
+}
+
+void uart_tx_str(pyb_uart_obj_t *uart_obj, const char *str) {
+ HAL_UART_Transmit(&uart_obj->uart, (uint8_t*)str, strlen(str), 100000);
+}
+
+void uart_tx_strn(pyb_uart_obj_t *uart_obj, const char *str, uint len) {
+ HAL_UART_Transmit(&uart_obj->uart, (uint8_t*)str, len, 100000);
+}
+
+void uart_tx_strn_cooked(pyb_uart_obj_t *uart_obj, const char *str, uint len) {
+ for (const char *top = str + len; str < top; str++) {
+ if (*str == '\n') {
+ uart_tx_char(uart_obj, '\r');
+ }
+ uart_tx_char(uart_obj, *str);
+ }
+}
+
+/******************************************************************************/
+/* Micro Python bindings */
+
+STATIC void pyb_uart_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
+ pyb_uart_obj_t *self = self_in;
+ if (!self->is_enabled) {
+ print(env, "UART(%lu)", self->uart_id);
+ } else {
+ print(env, "UART(%lu, baudrate=%u, bits=%u, stop=%u",
+ self->uart_id, self->uart.Init.BaudRate,
+ self->uart.Init.WordLength == UART_WORDLENGTH_8B ? 8 : 9,
+ self->uart.Init.StopBits == UART_STOPBITS_1 ? 1 : 2);
+ if (self->uart.Init.Parity == UART_PARITY_NONE) {
+ print(env, ", parity=None)");
+ } else {
+ print(env, ", parity=%u)", self->uart.Init.Parity == UART_PARITY_EVEN ? 0 : 1);
+ }
+ }
+}
+
+STATIC const mp_arg_parse_t pyb_uart_init_accepted_args[] = {
+ { MP_QSTR_baudrate, MP_ARG_PARSE_REQUIRED | MP_ARG_PARSE_INT, {.u_int = 9600} },
+ { MP_QSTR_bits, MP_ARG_PARSE_KW_ONLY | MP_ARG_PARSE_INT, {.u_int = 8} },
+ { MP_QSTR_stop, MP_ARG_PARSE_KW_ONLY | MP_ARG_PARSE_INT, {.u_int = 1} },
+ { MP_QSTR_parity, MP_ARG_PARSE_KW_ONLY | MP_ARG_PARSE_OBJ, {.u_obj = mp_const_none} },
+};
+#define PYB_UART_INIT_NUM_ARGS (sizeof(pyb_uart_init_accepted_args) / sizeof(pyb_uart_init_accepted_args[0]))
+
+STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
+ // parse args
+ mp_arg_parse_val_t vals[PYB_UART_INIT_NUM_ARGS];
+ mp_arg_parse_all(n_args, args, kw_args, PYB_UART_INIT_NUM_ARGS, pyb_uart_init_accepted_args, vals);
+
+ // set the UART configuration values
+ memset(&self->uart, 0, sizeof(self->uart));
+ UART_InitTypeDef *init = &self->uart.Init;
+ init->BaudRate = vals[0].u_int;
+ init->WordLength = vals[1].u_int == 8 ? UART_WORDLENGTH_8B : UART_WORDLENGTH_9B;
+ switch (vals[2].u_int) {
+ case 1: init->StopBits = UART_STOPBITS_1; break;
+ default: init->StopBits = UART_STOPBITS_2; break;
+ }
+ if (vals[3].u_obj == mp_const_none) {
+ init->Parity = UART_PARITY_NONE;
+ } else {
+ machine_int_t parity = mp_obj_get_int(vals[3].u_obj);
+ init->Parity = (parity & 1) ? UART_PARITY_ODD : UART_PARITY_EVEN;
+ }
+ init->Mode = UART_MODE_TX_RX;
+ init->HwFlowCtl = UART_HWCONTROL_NONE;
+ init->OverSampling = UART_OVERSAMPLING_16;
+
+ // init UART (if it fails, it's because the port doesn't exist)
+ if (!uart_init2(self)) {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "UART port %d does not exist", self->uart_id));
+ }
+
+ return mp_const_none;
+}
+
+STATIC mp_obj_t pyb_uart_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
+ // check arguments
+ mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
+
+ // create object
+ pyb_uart_obj_t *o = m_new_obj(pyb_uart_obj_t);
+ o->base.type = &pyb_uart_type;
+
+ // work out port
+ o->uart_id = 0;
+ if (MP_OBJ_IS_STR(args[0])) {
+ const char *port = mp_obj_str_get_str(args[0]);
+ if (0) {
+#if defined(PYBV10)
+ } else if (strcmp(port, "XA") == 0) {
+ o->uart_id = PYB_UART_XA;
+ } else if (strcmp(port, "XB") == 0) {
+ o->uart_id = PYB_UART_XB;
+ } else if (strcmp(port, "YA") == 0) {
+ o->uart_id = PYB_UART_YA;
+ } else if (strcmp(port, "YB") == 0) {
+ o->uart_id = PYB_UART_YB;
+#endif
+ } else {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "UART port %s does not exist", port));
+ }
+ } else {
+ o->uart_id = mp_obj_get_int(args[0]);
+ }
+
+ if (n_args > 1 || n_kw > 0) {
+ // start the peripheral
+ mp_map_t kw_args;
+ mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
+ pyb_uart_init_helper(o, n_args - 1, args + 1, &kw_args);
+ }
+
+ return o;
+}
+
+STATIC mp_obj_t pyb_uart_init(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
+ return pyb_uart_init_helper(args[0], n_args - 1, args + 1, kw_args);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_uart_init_obj, 1, pyb_uart_init);
+
+STATIC mp_obj_t pyb_uart_deinit(mp_obj_t self_in) {
+ pyb_uart_obj_t *self = self_in;
+ uart_deinit(self);
+ return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_uart_deinit_obj, pyb_uart_deinit);
+
+STATIC mp_obj_t pyb_uart_any(mp_obj_t self_in) {
+ pyb_uart_obj_t *self = self_in;
+ if (uart_rx_any(self)) {
+ return mp_const_true;
+ } else {
+ return mp_const_false;
+ }
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_uart_any_obj, pyb_uart_any);
+
+STATIC const mp_arg_parse_t pyb_uart_send_accepted_args[] = {
+ { MP_QSTR_send, MP_ARG_PARSE_REQUIRED | MP_ARG_PARSE_OBJ, {.u_obj = MP_OBJ_NULL} },
+ { MP_QSTR_timeout, MP_ARG_PARSE_KW_ONLY | MP_ARG_PARSE_INT, {.u_int = 5000} },
+};
+#define PYB_UART_SEND_NUM_ARGS (sizeof(pyb_uart_send_accepted_args) / sizeof(pyb_uart_send_accepted_args[0]))
+
+STATIC mp_obj_t pyb_uart_send(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
+ // TODO assumes transmission size is 8-bits wide
+
+ pyb_uart_obj_t *self = args[0];
+
+ // parse args
+ mp_arg_parse_val_t vals[PYB_UART_SEND_NUM_ARGS];
+ mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_UART_SEND_NUM_ARGS, pyb_uart_send_accepted_args, vals);
+
+ // get the buffer to send from
+ mp_buffer_info_t bufinfo;
+ uint8_t data[1];
+ pyb_buf_get_for_send(vals[0].u_obj, &bufinfo, data);
+
+ // send the data
+ HAL_StatusTypeDef status = HAL_UART_Transmit(&self->uart, bufinfo.buf, bufinfo.len, vals[1].u_int);
+
+ if (status != HAL_OK) {
+ // TODO really need a HardwareError object, or something
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_Exception, "HAL_UART_Transmit failed with code %d", status));
+ }
+
+ return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_uart_send_obj, 1, pyb_uart_send);
+
+STATIC const mp_arg_parse_t pyb_uart_recv_accepted_args[] = {
+ { MP_QSTR_recv, MP_ARG_PARSE_REQUIRED | MP_ARG_PARSE_OBJ, {.u_obj = MP_OBJ_NULL} },
+ { MP_QSTR_timeout, MP_ARG_PARSE_KW_ONLY | MP_ARG_PARSE_INT, {.u_int = 5000} },
+};
+#define PYB_UART_RECV_NUM_ARGS (sizeof(pyb_uart_recv_accepted_args) / sizeof(pyb_uart_recv_accepted_args[0]))
+
+STATIC mp_obj_t pyb_uart_recv(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
+ // TODO assumes transmission size is 8-bits wide
+
+ pyb_uart_obj_t *self = args[0];
+
+ // parse args
+ mp_arg_parse_val_t vals[PYB_UART_RECV_NUM_ARGS];
+ mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_UART_RECV_NUM_ARGS, pyb_uart_recv_accepted_args, vals);
+
+ // get the buffer to receive into
+ mp_buffer_info_t bufinfo;
+ mp_obj_t o_ret = pyb_buf_get_for_recv(vals[0].u_obj, &bufinfo);
+
+ // receive the data
+ HAL_StatusTypeDef status = HAL_UART_Receive(&self->uart, bufinfo.buf, bufinfo.len, vals[1].u_int);
+
+ if (status != HAL_OK) {
+ // TODO really need a HardwareError object, or something
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_Exception, "HAL_UART_Receive failed with code %d", status));
+ }
+
+ // return the received data
+ if (o_ret == MP_OBJ_NULL) {
+ return vals[0].u_obj;
+ } else {
+ return mp_obj_str_builder_end(o_ret);
+ }
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_uart_recv_obj, 1, pyb_uart_recv);
+
+STATIC const mp_map_elem_t pyb_uart_locals_dict_table[] = {
+ // instance methods
+ { MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&pyb_uart_init_obj },
+ { MP_OBJ_NEW_QSTR(MP_QSTR_deinit), (mp_obj_t)&pyb_uart_deinit_obj },
+ { MP_OBJ_NEW_QSTR(MP_QSTR_any), (mp_obj_t)&pyb_uart_any_obj },
+ { MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&pyb_uart_send_obj },
+ { MP_OBJ_NEW_QSTR(MP_QSTR_recv), (mp_obj_t)&pyb_uart_recv_obj },
+};
+
+STATIC MP_DEFINE_CONST_DICT(pyb_uart_locals_dict, pyb_uart_locals_dict_table);
+
+const mp_obj_type_t pyb_uart_type = {
+ { &mp_type_type },
+ .name = MP_QSTR_UART,
+ .print = pyb_uart_print,
+ .make_new = pyb_uart_make_new,
+ .locals_dict = (mp_obj_t)&pyb_uart_locals_dict,
+};
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