PDF《AT7456(E)使用方法及注意事项》

sbit SCLK = P3 ^ 5;

sbit SDIN = P3 ^ 6;

sbit SDOUT = P3 ^ 4;

// 根据需要添加合适的 nop 指令,用作延时,以满足 SPI 时钟数量不大于 10MHz #define delay // _nop_() // _nop_();

_nop_() // 向指定寄存器写

8 位数据 void write_at7456_addr_data(unsigned char addr, unsigned char dat) { unsigned char i;

SCLK = 0;

nCS = 0;

delay;

for (i=0;

iSR & SPI_I2S_FLAG_BSY) != 0);

GPIOA->BSRR = M_nCS;

// M_nCS =

1 } // 从指定寄存器读取

8 位数据 unsigned char read_at7456_addr_data(unsigned char addr) { unsigned char r;

GPIOA->BRR = M_nCS;

// M_nCS =

0 addr |= 0x80;

// D7 =

1 为读寄存器 r = SPI1->DR;

// 读数据,清除 RXNE // 等待发送缓冲器为空 while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);

// 发送数据 SPI1->DR = addr;

// 等待接收缓冲器为非空 while ((SPI1->SR & SPI_I2S_FLAG_RXNE) == 0);

r = SPI1->DR;

// 读数据 // 等待发送缓冲器为空 while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);

// 发送数据 SPI1->DR = 0xff;

// 等待接收缓冲器为非空 while ((SPI1->SR & SPI_I2S_FLAG_RXNE) == 0);

r = SPI1->DR;

// 读数据,清除 RXNE while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);

while ((SPI1->SR & SPI_I2S_FLAG_BSY) != 0);

GPIOA->BSRR = M_nCS;

// M_nCS =

1 return r;

} void write_at7456_data(unsigned char dat) { GPIOA->BRR = M_nCS;

// M_nCS =

0 SPI1->DR;

// 读数据,清除 RXNE // 等待发送缓冲器为空 while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);

// 发送数据 SPI1->DR = dat;

// 等待接收缓冲器为非空 while ((SPI1->SR & SPI_I2S_FLAG_RXNE) == 0);

SPI1->DR;

// 读数据,清除 RXNE // 等待发送缓冲器为空 while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);

while ((SPI1->SR & SPI_I2S_FLAG_BSY) != 0);

GPIOA->BSRR = M_nCS;

// M_nCS =

1 } unsigned char read_at7456_data(void) { unsigned char r;

GPIOA->BRR = M_nCS;

// M_nCS =

0 r = SPI1->DR;

// 读数据,清除 RXNE // 等待发送缓冲器为空 while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);

// 发送数据 SPI1->DR = 0xff;

// 等待接收缓冲器为非空 while ((SPI1->SR & SPI_I2S_FLAG_RXNE) == 0);

r = SPI1->DR;

// 读数据,清除 RXNE // 等待发送缓冲器为空 while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);

while ((SPI1->SR & SPI_I2S_FLAG_BSY) != 0);

GPIOA->BSRR = M_nCS;

// M_nCS =

1 return r;

} AT7456 读写程序:AT7456.C // // AT7456(E) 读写控制程序 --- AT7456.C // 杭州中科微电子有限公司 // 2017-03-31 // 0571-28918103 系统部 // #include "public.h" #include "AT7456.H" VER7456 newAt7456;

// AT7456 显示字符 void DisplayChar(unsigned char row, unsigned char col, unsigned char c) { unsigned int kk;

kk = row *

30 + col;

write_at7456_addr_data(DMAH, kk / 256);

// address write_at7456_addr_data(DMAL, kk % 256);

write_at7456_addr_data(DMDI, c);

} // 显示数字 0..9 void DisplayNum(unsigned char row, unsigned char col, unsigned char c) { unsigned int kk;

kk = row *

30 + col;

write_at7456_addr_data(DMAH, kk / 256);

// address write_at7456_addr_data(DMAL, kk % 256);

write_at7456_addr_data(DMDI, (c == 0) ?

10 : c);

} // 显示的字符串为字符和数字以及空格 void DisplayString(unsigned char row, unsigned char col, unsigned char *s) { unsigned int kk;

unsigned char c;

kk = row *

30 + col;

write_at7456_addr_data(DMAH, kk / 256);

// address write_at7456_addr_data(DMAL, kk % 256);

write_at7456_addr_data(DMM, 0x01);

// Auto Inc c = *s++;

while (c != 0) { if ((c >= '0') && (c = 'A') && (c = 'a') && (c