djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

stmhal: Add I2C functions for pure master read/write.

Browse Source
This commit is contained in:
Damien George 2014-04-16 00:27:14 +01:00
parent ee01411036
commit 2822d4e6ce
1 changed files with 44 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
stmhal/i2c.c
View File

@ -136,6 +136,48 @@ STATIC mp_obj_t pyb_i2c_scan(mp_obj_t self_in) {
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_i2c_scan_obj, pyb_i2c_scan);
STATIC mp_obj_t pyb_i2c_read(uint n_args, const mp_obj_t *args) {
pyb_i2c_obj_t *self = args[0];
machine_uint_t i2c_addr = mp_obj_get_int(args[1]) << 1;
machine_uint_t n = mp_obj_get_int(args[2]);
byte *data;
mp_obj_t o = mp_obj_str_builder_start(&mp_type_bytes, n, &data);
HAL_StatusTypeDef status = HAL_I2C_Master_Receive(self->i2c_handle, i2c_addr, data, n, 500);
if (status != HAL_OK) {
// TODO really need a HardwareError object, or something
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_Exception, "HAL_I2C_Master_Receive failed with code %d", status));
}
return mp_obj_str_builder_end(o);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_i2c_read_obj, 3, 3, pyb_i2c_read);
STATIC mp_obj_t pyb_i2c_write(uint n_args, const mp_obj_t *args) {
pyb_i2c_obj_t *self = args[0];
machine_uint_t i2c_addr = mp_obj_get_int(args[1]) << 1;
HAL_StatusTypeDef status;
if (MP_OBJ_IS_INT(args[2])) {
uint8_t data[1] = {mp_obj_get_int(args[2])};
status = HAL_I2C_Master_Transmit(self->i2c_handle, i2c_addr, data, 1, 500);
} else {
buffer_info_t bufinfo;
mp_get_buffer_raise(args[2], &bufinfo);
status = HAL_I2C_Master_Transmit(self->i2c_handle, i2c_addr, bufinfo.buf, bufinfo.len, 500);
}
if (status != HAL_OK) {
// TODO really need a HardwareError object, or something
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_Exception, "HAL_I2C_Master_Transmit failed with code %d", status));
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_i2c_write_obj, 3, 3, pyb_i2c_write);
STATIC mp_obj_t pyb_i2c_mem_read(uint n_args, const mp_obj_t *args) {
pyb_i2c_obj_t *self = args[0];
machine_uint_t i2c_addr = mp_obj_get_int(args[1]) << 1;
@ -187,6 +229,8 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_i2c_mem_write_obj, 4, 4, pyb_i2c_
STATIC const mp_map_elem_t pyb_i2c_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_is_ready), (mp_obj_t)&pyb_i2c_is_ready_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_scan), (mp_obj_t)&pyb_i2c_scan_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&pyb_i2c_read_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&pyb_i2c_write_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_mem_read), (mp_obj_t)&pyb_i2c_mem_read_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_mem_write), (mp_obj_t)&pyb_i2c_mem_write_obj },
};