ti公司开发的 m25p20存储芯片的程序，适用于iar开发坏境。

M25P20, M25P40, M25P80, M25P16, M25P32, M25P64 SPI FLASH C语言软件驱动源码 void InitSPIMaster(void) { /* P4SFS0 |= 0x70; P4SFS1 |= 0x70; // Setup P4[4..6] Port as SPI // P4.7 works in GPIO mode as the Slave Select signal SPICON1=0x00; //bit3:TEIE=0. SPI transmission end interrupt disable //bit2:RORIE=0. SPI receive overrun interrupt disable //bit1:TIE=0. SPI transmission interrupt disable //bit0:RIE=0 SPI reception interrupt disable SPICLKD=0x2C; //select frequency divider=0x2C SPICON0=0x72; //bit6:TE=1. SPI Transmitter enable //bit5:RE=1. SPI Receiver enable //bit4:SPIEN=1. SPI enable //bit3:SSEL=0. SPI Slave select output is disabled,use P4.7 as the Select Slave signal //bit2:FLSB=0. SPI Transfer the MSB first //bit1:SPO=1. SPI Sample data on the rising edge of the clock */ }