PROGMEM语法LGT8F328P不能用怎么解决？ 已经解决！
本帖最后由 aisls 于 2019-4-17 15:36 编辑大家好，PROGMEM 语法在 ATmega328, Atmega32u4上都可以正常工作。
但是在LGT8F328P上可以编译通过可以上传，但是代码工作不正常。
我用的Arduino IDE 1.8.5+HSP v3.6
大神们知道怎么解决吗？ aisls 发表于 2019-4-17 08:54
下面的代码，在LGT8F328P下运行结果不对。如果去掉PROGMEM关键字，运行就正确了。
...
要注意：要小心檢查這個程序，因在 Arduino Nano運行時，也會運行結果不對的。 你沒有附程序，很難幫你！
運行以下這個程序，這個程序在LGT8F328P下運行是可以的。
// save some unsigned ints
const PROGMEM uint16_t charSet[] = { 65000, 32796, 16843, 10, 11234};
// save some chars
const char signMessage[] PROGMEM = {"I AM PREDATOR,UNSEEN COMBATANT. CREATED BY THE UNITED STATES DEPART"};
unsigned int displayInt;
char myChar;
void setup() {
Serial.begin(9600);
while (!Serial);// wait for serial port to connect. Needed for native USB
// put your setup code here, to run once:
// read back a 2-byte int
for (byte k = 0; k < 5; k++) {
displayInt = pgm_read_word_near(charSet + k);
Serial.println(displayInt);
}
Serial.println();
// read back a char
for (byte k = 0; k < strlen_P(signMessage); k++) {
myChar = pgm_read_byte_near(signMessage + k);
Serial.print(myChar);
}
Serial.println();
}
void loop() {
// put your main code here, to run repeatedly:
} 下面的代码，在LGT8F328P下运行结果不对。如果去掉PROGMEM关键字，运行就正确了。
const PROGMEM unsigned char crc_array = {
0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F,
0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D, 0x70, 0x77, 0x7E, 0x79,
0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53,
0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, 0x90, 0x97,
0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1,
0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC,
0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88,
0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A, 0x27, 0x20, 0x29, 0x2E,
0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04,
0x0D, 0x0A, 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, 0x89, 0x8E,
0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8,
0xAD, 0xAA, 0xA3, 0xA4, 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2,
0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56,
0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, 0x19, 0x1E, 0x17, 0x10,
0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A,
0x33, 0x34, 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, 0x3E, 0x39,
0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F,
0x1A, 0x1D, 0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5,
0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1,
0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3 };
unsigned char CRC8_Table(unsigned char *p, char counter)
{
unsigned char crc8 = 0;
for (;counter > 0; counter--)
{
crc8 = crc_array; //查表得到CRC码
p++;
}
return crc8;
}
void setup()
{
Serial.begin(9600);
delay(1000);
char a[]="hello 111world";
unsigned char x = CRC8_Table(a, sizeof(a));
Serial.println(x);
}
void loop()
{
} 查表的那句要改成如下的：
crc8 = pgm_read_byte_near(crc_array + (crc8^*p)); //查表得到CRC码
感谢大神指点！！ 还是搞不定，，，，，，:L
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