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29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \brief Driver for the LPC23xx I2C (implementation)
37 #include "cfg/cfg_i2c.h"
39 #define LOG_LEVEL I2C_LOG_LEVEL
40 #define LOG_FORMAT I2C_LOG_FORMAT
44 #include <cfg/debug.h>
45 #include <cfg/macros.h> // BV()
46 #include <cfg/module.h>
48 #include <cpu/detect.h>
51 #include <drv/timer.h>
53 #include <drv/vic_lpc2.h> /* vic_handler_t */
55 #include <io/lpc23xx.h>
63 #define I2C I2C0_MASTER_BASE
64 #define SYSCTL_RCGC1_I2C SYSCTL_RCGC1_I2C0
65 #define SYSCTL_RCGC2_GPIO SYSCTL_RCGC2_GPIOB
66 #define GPIO_I2C_SCL_PIN GPIO_I2C0_SCL_PIN
67 #define GPIO_I2C_SDA_PIN GPIO_I2C0_SDA_PIN
68 #define GPIO_PORT_BASE GPIO_PORTB_BASE
71 #define I2C I2C1_MASTER_BASE
72 #define SYSCTL_RCGC1_I2C SYSCTL_RCGC1_I2C1
73 #define SYSCTL_RCGC2_GPIO SYSCTL_RCGC2_GPIOA
74 #define GPIO_I2C_SCL_PIN GPIO_I2C1_SCL_PIN
75 #define GPIO_I2C_SDA_PIN GPIO_I2C1_SDA_PIN
76 #define GPIO_PORT_BASE GPIO_PORTA_BASE
81 * Send START condition and select slave for write.
82 * \c id is the device id comprehensive of address left shifted by 1.
83 * The LSB of \c id is ignored and reset to 0 for write operation.
85 * \return true on success, false otherwise.
87 bool i2c_builtin_start_w(uint8_t id)
95 * Send START condition and select slave for read.
96 * \c id is the device id comprehensive of address left shifted by 1.
97 * The LSB of \c id is ignored and set to 1 for read operation.
99 * \return true on success, false otherwise.
101 bool i2c_builtin_start_r(uint8_t id)
108 void i2c_builtin_stop(void)
113 bool i2c_builtin_put(const uint8_t data)
120 int i2c_builtin_get(bool ack)
127 * With this function is allowed only the atomic write.
129 bool i2c_send(const void *_buf, size_t count)
131 const uint8_t *buf = (const uint8_t *)_buf;
138 * In order to read bytes from the i2c we should make some tricks.
140 bool i2c_recv(void *_buf, size_t count)
148 #define I2C_PCONP PCONP_PCI2C0
149 #define I2C_CONSET I20CONSET
150 #define I2C_CONCLR I20CONCLR
151 #define I2C_SCLH I20SCLH
152 #define I2C_SCLL I20SCLL
156 * Initialize I2C module.
158 void i2c_builtin_init(void)
160 PCONP |= BV(I2C_PCONP); // enable I2C0 clock
162 #if (CONFIG_I2C_FREQ > 400000)
163 #error i2c frequency is to hight.
166 I2C_CONCLR = BV(I2CON_I2ENC);
168 // Bit Frequency = Fplk / (I2C_I2SCLH + I2C_I2SCLL)
169 // value of I2SCLH and I2SCLL must be different
171 PCLKSEL0 |= I2C0_PCLK_DIV8;
172 I2C_SCLH = (((CPU_FREQ / 8) / CONFIG_I2C_FREQ) / 2) + 1;
173 I2C_SCLL = (((CPU_FREQ / 8) / CONFIG_I2C_FREQ) / 2);
175 ASSERT(I2C_SCLH > 4 || I2C_SCLL > 4);
177 //I2CState = I2C_IDLE;
179 // Assign pins to SCL and SDA (P0_27, P0_28)
180 PINSEL0 |= BV(27) | BV(28);
183 I2C_CONSET = BV(I2CON_I2EN);
184 I2C_CONCLR |= BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC);
186 kprintf("h%ld l%ld\n", I2C_SCLH, I2C_SCLL);