Access ptr8 from viper inside user C module? #18318
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Hi, I'm working on improving the speed of some functions and have a mix of viper code and C code in my project. Long story short I'm not sure how to access a ptr8 from my C module, when I try and edit values it doesn't seem to change. in my viper function we have and perform_test is in a c module and it simply And the buf remains unchanged. |
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Replies: 2 comments 3 replies
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I would expect that |
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Just tried this, but firmware won't boot with it like that :/ |
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WAIT the firmware was totally messed up cuz i had my wrong method still in there as well and the byte alignment made it break the bin, this actually worked tysm!! |
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There's a bit more to look for. STATIC mp_obj_t someclass_staticmethod1(mp_obj_t var1) {
if (mp_obj_is_obj(var1)) {
if (mp_obj_is_type(var1, &mp_type_bytearray)) {
mp_buffer_info_t bufinfo;
if (mp_get_buffer(var1, &bufinfo, 0)) {
uint8_t * address8 = bufinfo.buf;
uint32_t len = bufinfo.len;
printf(" is bytearray @%p size=%d\n", address8, (int)len);
}
}
}
return mp_const_none;
} |
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tried this and micropython wouldnt start. this is as far as i can get w/o it crashing. It doesn't print yes1 STATIC mp_obj_t perform_test(size_t n_args, const mp_obj_t *args) {
mp_obj_t var1 = args[0];
if(mp_obj_is_obj(var1)) {
printf("yes1");
// if(mp_obj_is_type(var1, &mp_type_bytearray)) {
// printf("yes2");
// mp_buffer_info_t bufinfo;
// if(mp_get_buffer(var1, &bufinfo, 0)) {
// uint8_t* address8 = bufinfo.buf;
// uint32_t len = bufinfo.len;
// printf(" is bytearray @%p size=%d\n", address8, (int)len);
// }
// }
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(perform_test_obj, 1, 1, perform_test); |
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I would expect that
bufwould be passed in the same way that Micropython passes integers. So in your C code you will have to extract the integer and cast it to a pointer first. The way to do this is using the macros inpy/obj.h: