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物联网中经常用到NFC功能，接下来我们介绍6621CXC驱动NFC芯片SI522，我们以simple例子介绍，添加相应接口 1）我们用到7,8,9,10,口，main.c文件头定义做修改 #define PIN_WAKEUP_0 2 // UART-RTS@EVB #define PIN_WAKEUP_1 24 // KEY1@EVB #define PIN_LED_0 13 #define PIN_LED_1 13//9 #define PIN_LED_2 13 #define PIN_LED_3 25 #define PIN_LED_4 13 #define PIN_LED_5 14 #define PIN_LED_6 14 #define PIN_LED_7 14 #define PIN_UART0_TX 5//7 #define PIN_UART1_TX 13//5 #define PIN_UART1_RX 6 2）添加example_spi函数 void example_spi(void)
{
CO_ALIGN(4) uint8_t txbuf[100] = {0}; // SPI DMA request 4bytes align
CO_ALIGN(4) uint8_t rxbuf[100] = {0}; // SPI DMA request 4bytes align
int i;
for(i=0;i<100;i++)
txbuf[i]=i;
for(i=0;i<100;i++)
rxbuf[i]=0;
// Pinmux
pinmux_config(7, PINMUX_SPI0_MST_SDA_I_CFG); /*MISO*/
pinmux_config(8, PINMUX_SPI0_MST_SDA_O_CFG); /*MOSI*/
pinmux_config(9, PINMUX_SPI0_MST_SCK_CFG); /*SCLK*/
pinmux_config(10, PINMUX_SPI0_MST_CSN_CFG); /*CSN */
// SPI Init
spi_open(HS_SPI0, SPI_MODE_MASTER, SPI_TRANS_MODE_0, 200000);
// Exchange data
spi_master_cs_low(HS_SPI0);
spi_master_exchange(HS_SPI0, txbuf, rxbuf, 10);
spi_master_cs_high(HS_SPI0);
log_debug_array_ex("rxbuf[0] \n", rxbuf,10);
}3）main函数修改 int main(void)
{
ble_stack_config();
hardware_init();
rwip_init(RESET_NO_ERROR);
co_power_register_sleep_event(power_sleep_event_handler);
log_debug("running %d\n", pmu_reboot_reason());
appm_init();
//example_i2c();
example_spi();
//co_timer_set(&simple_timer, 100, TIMER_REPEAT, simple_timer_handler, NULL);
while(1)
{
rwip_schedule();
}
}4）程序打印输出 running 0 rxbuf[0] : 09 00 01 02 03 04 05 06 07 08 [10bytes] 5）SPI口波形数据如下截图
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