Diff: A7105.cpp

Revision:

4:ca02a935e8eb

Parent:

3:cd7f899f155f

Child:

6:44b04880717b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/A7105.cpp	Thu Jan 01 19:13:10 2015 +0000
@@ -0,0 +1,139 @@
+#include "mbed.h"
+#include "A7105.h"
+
+A7105::A7105(PinName mosi, PinName miso, PinName clk, PinName cs, uint32_t freqHz) :
+        _spi(mosi, miso, clk), _cs(cs) {
+    _spi.frequency(freqHz);
+    // Chip select is active low so set it to high until we are ready
+    _cs = 1;
+}
+
+A7105::~A7105() {}
+
+uint8_t A7105::writeRegister(uint8_t regAddr, uint8_t value) {
+    // assert CS
+    _cs = 0;
+    // write register
+    _spi.write(regAddr);
+    // write value into register
+    uint8_t ret = _spi.write(value);
+    // de-assert CS
+    wait_us(1);
+    _cs = 1;
+    
+    return ret;
+}
+
+uint8_t A7105::readRegister(uint8_t regAddr) {
+    // assert CS
+    _cs = 0;
+    // write register and read value
+    uint8_t ret = _spi.write(_READ(regAddr));
+    // de-assert CS
+    wait_us(1);
+    _cs = 1;
+    
+    return ret;
+}
+
+uint8_t A7105::strobe(enum A7105_State state) {
+    // assert CS
+    _cs = 0;
+    // write strobe command
+    uint8_t ret = _spi.write(state);
+    // de-assert CS
+    wait_us(1);
+    _cs = 1;
+    
+    return ret;
+}
+
+void A7105::writeData(uint8_t* data, size_t len) {
+    // assert CS
+    _cs = 0;
+    _spi.write(A7105_RST_WRPTR);
+    _spi.write(A7105_05_FIFO_DATA);
+    for (size_t i = 0; i < len; i++) {
+        _spi.write(data[i]);
+    }
+
+    // de-assert CS
+    wait_us(1);
+    _cs = 1;
+}
+
+void A7105::readData(uint8_t* buffer, size_t len) {
+    strobe(A7105_RST_RDPTR);
+    for (size_t i = 0; i < len; i++) {
+        buffer[i] = readRegister(A7105_05_FIFO_DATA);
+    }
+}
+
+void A7105::setId(uint32_t id) {
+    // assert CS
+    _cs = 0;
+    _spi.write(A7105_06_ID_DATA);
+    _spi.write((uint8_t)(id >> 24) & 0xFF);
+    _spi.write((uint8_t)(id >> 16) & 0xFF);
+    _spi.write((uint8_t)(id >> 8) & 0xFF);
+    _spi.write((uint8_t)id & 0xFF);
+    // de-assert CS
+    wait_us(1);
+    _cs = 1;
+}
+
+void A7105::setPower(int32_t power) {
+   /*
+    Power amp is ~+16dBm so:
+    TXPOWER_100uW  = -23dBm == PAC=0 TBG=0
+    TXPOWER_300uW  = -20dBm == PAC=0 TBG=1
+    TXPOWER_1mW    = -16dBm == PAC=0 TBG=2
+    TXPOWER_3mW    = -11dBm == PAC=0 TBG=4
+    TXPOWER_10mW   = -6dBm  == PAC=1 TBG=5
+    TXPOWER_30mW   = 0dBm   == PAC=2 TBG=7
+    TXPOWER_100mW  = 1dBm   == PAC=3 TBG=7
+    TXPOWER_150mW  = 1dBm   == PAC=3 TBG=7
+    */
+    uint8_t pac, tbg;
+    switch(power) {
+        case 0: pac = 0; tbg = 0; break;
+        case 1: pac = 0; tbg = 1; break;
+        case 2: pac = 0; tbg = 2; break;
+        case 3: pac = 0; tbg = 4; break;
+        case 4: pac = 1; tbg = 5; break;
+        case 5: pac = 2; tbg = 7; break;
+        case 6: pac = 3; tbg = 7; break;
+        case 7: pac = 3; tbg = 7; break;
+        default: pac = 0; tbg = 0; break;
+    };
+    writeRegister(A7105_28_TX_TEST, (pac << 3) | tbg);
+}
+
+void A7105::setTxRxMode(enum TXRX_State mode) {
+    if(mode == TX_EN) {
+        writeRegister(A7105_0B_GPIO1_PIN_I, 0x33);
+        writeRegister(A7105_0C_GPIO2_PIN_II, 0x31);
+    } else if (mode == RX_EN) {
+        writeRegister(A7105_0B_GPIO1_PIN_I, 0x31);
+        writeRegister(A7105_0C_GPIO2_PIN_II, 0x33);
+    } else {
+        //The A7105 seems to some with a cross-wired power-amp (A7700)
+        //On the XL7105-D03, TX_EN -> RXSW and RX_EN -> TXSW
+        //This means that sleep mode is wired as RX_EN = 1 and TX_EN = 1
+        //If there are other amps in use, we'll need to fix this
+        writeRegister(A7105_0B_GPIO1_PIN_I, 0x33);
+        writeRegister(A7105_0C_GPIO2_PIN_II, 0x33);
+    }
+}
+
+int8_t A7105::reset() {
+    writeRegister(A7105_00_MODE, 0x00);
+    wait_us(1000);
+    
+    // Set both GPIO as output and low
+    setTxRxMode(TXRX_OFF);
+    int8_t result = readRegister(A7105_10_PLL_II) == 0x9E;
+    strobe(A7105_STANDBY);
+    
+    return result;
+}
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