13.4 Scan Code Example
The following code example illustrates the Request/Response flow on a Wi-Fi Scan request.
Note: For more details on example codes, refer to
the Wi-Fi Network Controller Software
Programming Guide.
- The application requests a Wi-Fi scan.
{
m2m_wifi_request_scan(M2M_WIFI_CH_ALL);
}- The host driver Wi-Fi layer formats
the request and forward it to HIF (Host Interface)
layer.
sint8 m2m_wifi_request_scan(uint8 ch) { tstrM2MScan strtmp; sint8 s8Ret = M2M_ERR_SCAN_IN_PROGRESS; strtmp.u8ChNum = ch; s8Ret = hif_send(M2M_REQ_GRP_WIFI, M2M_WIFI_REQ_SCAN, (uint8*)&strtmp, sizeof(tstrM2MScan),NULL, 0,0); return s8Ret; }
- The HIF layer sends the request to the WINC chip.
sint8 hif_send(uint8 u8Gid,uint8 u8Opcode,uint8 *pu8CtrlBuf,uint16 u16CtrlBufSize,
uint8 *pu8DataBuf,uint16 u16DataSize, uint16 u16DataOffset)
{
sint8 ret = M2M_ERR_SEND;
volatile tstrHifHdr strHif;
strHif.u8Opcode = u8Opcode&(~NBIT7);
strHif.u8Gid = u8Gid;
strHif.u16Length = M2M_HIF_HDR_OFFSET;
if(pu8DataBuf != NULL)
{
strHif.u16Length += u16DataOffset + u16DataSize;
}
else
{
strHif.u16Length += u16CtrlBufSize;
}
/* TX STEP (1) */
ret = hif_chip_wake();
if(ret == M2M_SUCCESS)
{
volatile uint32 reg, dma_addr = 0;
volatile uint16 cnt = 0;
reg = 0UL;
reg |= (uint32)u8Gid;
reg |= ((uint32)u8Opcode<<8);
reg |= ((uint32)strHif.u16Length<<16);
ret = nm_write_reg(NMI_STATE_REG,reg);
if(M2M_SUCCESS != ret) goto ERR1;
reg = 0;
/* TX STEP (2) */
reg |= (1<<1);
ret = nm_write_reg(WIFI_HOST_RCV_CTRL_2, reg);
if(M2M_SUCCESS != ret) goto ERR1;
dma_addr = 0;
for(cnt = 0; cnt < 1000; cnt ++)
{
ret = nm_read_reg_with_ret(WIFI_HOST_RCV_CTRL_2,(uint32 *)®);
if(ret != M2M_SUCCESS) break;
if (!(reg & 0x2))
{
/* TX STEP (3) */
ret = nm_read_reg_with_ret(0x150400,(uint32 *)&dma_addr);
if(ret != M2M_SUCCESS) {
/*in case of read error clear the dma address and return error*/
dma_addr = 0;
}
/*in case of success break */
break;
}
}
if (dma_addr != 0)
{
volatile uint32 u32CurrAddr;
u32CurrAddr = dma_addr;
strHif.u16Length=NM_BSP_B_L_16(strHif.u16Length);
/* TX STEP (4) */
ret = nm_write_block(u32CurrAddr, (uint8*)&strHif, M2M_HIF_HDR_OFFSET);
if(M2M_SUCCESS != ret) goto ERR1;
u32CurrAddr += M2M_HIF_HDR_OFFSET;
if(pu8CtrlBuf != NULL)
{
ret = nm_write_block(u32CurrAddr, pu8CtrlBuf, u16CtrlBufSize);
if(M2M_SUCCESS != ret) goto ERR1;
u32CurrAddr += u16CtrlBufSize;
}
if(pu8DataBuf != NULL)
{
u32CurrAddr += (u16DataOffset - u16CtrlBufSize);
ret = nm_write_block(u32CurrAddr, pu8DataBuf, u16DataSize);
if(M2M_SUCCESS != ret) goto ERR1;
u32CurrAddr += u16DataSize;
}
reg = dma_addr << 2;
reg |= (1 << 1);
/* TX STEP (5) */
ret = nm_write_reg(WIFI_HOST_RCV_CTRL_3, reg);
if(M2M_SUCCESS != ret) goto ERR1;
}
else
{
/* ERROR STATE */
M2M_DBG("Failed to alloc rx size\r");
ret = M2M_ERR_MEM_ALLOC;
goto ERR1;
}
}
else
{
M2M_ERR("(HIF)Fail to wakup the chip\n");
goto ERR1;
}
/* TX STEP (6) */
ret = hif_chip_sleep();
ERR1:
return ret;
}- The WINC chip processes the request and interrupts the host after finishing the operation.
- The HIF layer then receives the response.
static sint8 hif_isr(void)
{
sint8 ret = M2M_ERR_BUS_FAIL;
uint32 reg;
volatile tstrHifHdr strHif;
/* RX STEP (1) */
ret = hif_chip_wake();
if(ret == M2M_SUCCESS)
{
/* RX STEP (2) */
ret = nm_read_reg_with_ret(WIFI_HOST_RCV_CTRL_0, ®);
if(M2M_SUCCESS == ret)
{
/* New interrupt has been received */
if(reg & 0x1)
{
uint16 size;
nm_bsp_interrupt_ctrl(0);
/*Clearing RX interrupt*/
ret = nm_read_reg_with_ret(WIFI_HOST_RCV_CTRL_0,®);
if(ret != M2M_SUCCESS)goto ERR1;
reg &= ~(1<<0);
/* RX STEP (3) */
ret=nm_write_reg(WIFI_HOST_RCV_CTRL_0,reg);
if(ret != M2M_SUCCESS)goto ERR1;
/* read the rx size */
ret = nm_read_reg_with_ret(WIFI_HOST_RCV_CTRL_0, ®);
if(M2M_SUCCESS != ret)
{
M2M_ERR("(hif) WIFI_HOST_RCV_CTRL_0 bus fail\n");
nm_bsp_interrupt_ctrl(1);
goto ERR1;
}
gu8HifSizeDone = 0;
size = (uint16)((reg >> 2) & 0xfff);
if (size > 0)
{
uint32 address = 0;
/** start bus transfer **/
/* RX STEP (4) */
ret = nm_read_reg_with_ret(WIFI_HOST_RCV_CTRL_1, &address);
if(M2M_SUCCESS != ret)
{
M2M_ERR("(hif) WIFI_HOST_RCV_CTRL_1 bus fail\n");
nm_bsp_interrupt_ctrl(1);
goto ERR1;
}
ret = nm_read_block(address, (uint8*)&strHif, sizeof(tstrHifHdr));
strHif.u16Length = NM_BSP_B_L_16(strHif.u16Length);
if(M2M_SUCCESS != ret)
{
M2M_ERR("(hif) address bus fail\n");
nm_bsp_interrupt_ctrl(1);
goto ERR1;
}
if(strHif.u16Length != size)
{
if((size - strHif.u16Length) > 4)
{
M2M_ERR("(hif) Corrupted packet Size = %u <L = %u, G = %u, OP = %02X>\n",
size, strHif.u16Length, strHif.u8Gid, strHif.u8Opcode);
nm_bsp_interrupt_ctrl(1);
ret = M2M_ERR_BUS_FAIL;
goto ERR1;
}
}
/* RX STEP (5) */
if(M2M_REQ_GRP_WIFI == strHif.u8Gid)
{
if(pfWifiCb)
{
pfWifiCb(strHif.u8Opcode,strHif.u16Length - M2M_HIF_HDR_OFFSET,
address + M2M_HIF_HDR_OFFSET);
}
}
else if(M2M_REQ_GRP_IP == strHif.u8Gid)
{
if(pfIpCb)
{
pfIpCb(strHif.u8Opcode,strHif.u16Length - M2M_HIF_HDR_OFFSET,
address + M2M_HIF_HDR_OFFSET);
}
}
else if(M2M_REQ_GRP_OTA == strHif.u8Gid)
{
if(pfOtaCb)
{
pfOtaCb(strHif.u8Opcode,strHif.u16Length - M2M_HIF_HDR_OFFSET,
address + M2M_HIF_HDR_OFFSET);
}
}
else
{
M2M_ERR("(hif) invalid group ID\n");
ret = M2M_ERR_BUS_FAIL;
goto ERR1;
}
/* RX STEP (6) */
if(!gu8HifSizeDone)
{
M2M_ERR("(hif) host app didn't set RX Done\n");
ret = hif_set_rx_done();
}
}
else
{
ret = M2M_ERR_RCV;
M2M_ERR("(hif) Wrong Size\n");
goto ERR1;
}
}
else
{
#ifndef WIN32
M2M_ERR("(hif) False interrupt %lx",reg);
#endif
}
}
else
{
M2M_ERR("(hif) Fail to Read interrupt reg\n");
goto ERR1;
}
}
else
{
M2M_ERR("(hif) FAIL to wakeup the chip\n");
goto ERR1;
}
/* RX STEP (7) */
ret = hif_chip_sleep();
ERR1:
return ret;
}- The appropriate handler in the Wi-Fi layer (called from the HIF layer).
static void m2m_wifi_cb(uint8 u8OpCode, uint16 u16DataSize, uint32 u32Addr)
{ // …code eliminated…
else if (u8OpCode == M2M_WIFI_RESP_SCAN_DONE)
{
tstrM2mScanDone strState;
gu8scanInProgress = 0;
if(hif_receive(u32Addr, (uint8*)&strState, sizeof(tstrM2mScanDone), 0) == M2M_SUCCESS)
{
gu8ChNum = strState.u8NumofCh;
if (gpfAppWifiCb)
gpfAppWifiCb(M2M_WIFI_RESP_SCAN_DONE, &strState);
}
}
// …code eliminated…
}- The Wi-Fi layer sends the response to the application through its callback function.
if (u8MsgType == M2M_WIFI_RESP_SCAN_DONE)
{
tstrM2mScanDone *pstrInfo = (tstrM2mScanDone*) pvMsg;
if( (gu8IsWiFiConnected == M2M_WIFI_DISCONNECTED) &&
(gu8WPS == WPS_DISABLED) && (gu8Prov == PROV_DISABLED) )
{
gu8Index = 0;
gu8Sleep = PS_WAKE;
if (pstrInfo->u8NumofCh >= 1)
{
m2m_wifi_req_scan_result(gu8Index);
gu8Index++;
}
else
{
m2m_wifi_request_scan(M2M_WIFI_CH_ALL);
}
}
}