`pgm_read_byte()`函数是一个预定义的函数,它用于读取程序存储空间中的数据。在Arduino环境中,由于程序存储空间有限,数据通常存储在这个空间中,以便节省动态内存的使用。 使用`pgm_read_byte()`函数读取字节数据 当我们想要读取程序存储空间中的单个字节时,可以使用`pgm_read_byte()`函数。以下是`pgm_read_byte(...
I have the following code: PROGMEM const uint8_t table[2][3] = { {0x7B,0x60,0x5D}, {0x7D,0x48,0x3E} }; void setup() { Serial.begin(115200); } void loop() { uint8_t data = pgm_read_byte(&table[1][1]); Serial.println(data, HEX); delay(250)...
Fri 20 Nov 2009 11:32:06 AM CET The pgm_read_xxx() functions in <avr/pgmspace.h> are currently implemented as macros, casting the parameter to (uint16_t). While the parameter is supposed to be a pointer, this enables to use any garbage (...
prog_uchar x = 4， xxx[5] = {1,2,3,4,5};unsigned char xx, xxxx;xx = pmg_read_byte(&x);xxxx = pgm_read_byte(&xxx[0]);The functions in this module provide interfaces for a program to access data stored in program space (flash memory) of the device. In order to...
classic__(addr)#endif/** \ingroup avr_pgmspace\def pgm_read_byte_near(address_short)Read a ...
原来是用#define pgm_read_byte(a) (*(a))添加一个宏就行了 呵呵
We had the driveway done today by pgm it was really easy to book in, he kept me updated on everything over the phone, the guys did a really good job, they were on time and got straight to work and got the job done in good time and left everything tidy and did a really professi...
% cbcldata - read face image data from cbcl database % This is where the cbcl face images reside P ='C:\Users\kitty\Dropbox\non negative factorization\faces\face.test\test\face'; % Create the data matrix D=dir(fullfile(P,'*.pgm')); ...
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how to read multiple pgm images ? I'm working with a database which has 472 pgm files inside a folder named faces. I want to read all 472 and store it I also each file inside the folder is name cmu_0000.pgm...cmu_00471.pgm